Neurology — MCQs

Q: A 49-year-old man presents with progressive weakness in his arms and legs over 24 months. He has bulbar symptoms including dysphagia and dysarthria. EMG shows widespread denervation. What is the most important prognostic factor?

Bulbar involvement. ***Bulbar involvement*** - The presence of **bulbar symptoms** (dysphagia and dysarthria) at presentation or early in the disease course is the single most important predictor of shorter survival in **Amyotrophic Lateral Sclerosis (ALS)**. - This is primarily because bulbar dysfunction leads quickly to difficulty swallowing, increasing the risk of **aspiration pneumonia** and malnutrition, and often precedes necessary respiratory intervention. *Age at onset* - While a factor, **older age (>65 years)** at onset is associated with a worse prognosis but is generally considered less influential than the pattern of motor neuron involvement. - Patients with **younger onset** (e.g., in their 40s) tend to have a slightly better prognosis than those with onset in their 70s. *Rate of progression* - The **rate of progression** directly determines the prognosis (survival time) itself, reflecting the speed of motor neuron loss. - However, **bulbar involvement** is often the underlying *predictor* or characteristic that drives a rapid rate of progression, making the bulbar site the more fundamental prognostic factor. *Site of onset* - The specific **site of onset** is critical, distinguishing between **limb-onset** and **bulbar-onset** ALS. - Because bulbar onset conveys the worst prognosis, selecting the specific involvement (**bulbar**) is more precise than selecting the general concept of

Q: A 28-year-old woman presents with sudden onset severe headache during exercise. She vomits and has neck stiffness. CT head shows subarachnoid hemorrhage. What is the most likely cause?

Berry aneurysm. ***Berry aneurysm*** - The sudden onset of a severe, explosive **thunderclap headache** coupled with signs of meningeal irritation (vomiting, neck stiffness) and the finding of **subarachnoid hemorrhage (SAH)** on CT head is the classic presentation of a ruptured saccular (**berry**) aneurysm. - Exertion (exercise) acts as a common trigger for aneurysm rupture due to the sudden increase in **intracranial pressure** and transmural wall stress. *Arteriovenous malformation* - AVMs more commonly present with **intraparenchymal hemorrhage** (ICH) or seizures, rather than isolated SAH, especially when triggered by exertion. - While AVMs can cause SAH, they are a less frequent cause of widespread spontaneous SAH compared to ruptured **berry aneurysms**. *Carotid dissection* - Carotid artery dissection typically manifests as severe neck/facial pain, headache, and signs of **cerebral ischemia** (stroke symptoms) due to vessel stenosis or occlusion. - Dissections rarely cause primary, widespread SAH; they are more often associated with **subintimal hemorrhage** leading to stroke or pseudoaneurysm formation. *Hypertensive hemorrhage* - Hemorrhage due to chronic or severe hypertension (hypertensive hemorrhage) almost exclusively causes deep **intraparenchymal hemorrhage** (ICH), usually in the basal ganglia, thalamus, or brainstem. - The primary finding of SAH, rather than ICH and the patient's young age, makes uncontrolled hypertension highly unlikely as the underlying cause. *Trauma* - Although trauma is the single most frequent overall cause of SAH, the clinical history describes a **spontaneous event** triggered by exertion (exercise) without any external injury. - Traumatic SAH is clinically differentiated by the history of a specific injury and usually involves bleeding adjacent to the site of impact.

Q: A 41-year-old man presents with progressive weakness in his hands and arms over 12 months. He has muscle fasciculations and hyperreflexia. EMG shows both acute and chronic denervation changes. What is the prognosis?

Poor with 3-5 year survival. ***Poor with 3-5 year survival*** - The presentation with **progressive weakness**, **muscle fasciculations** (lower motor neuron sign), and **hyperreflexia** (upper motor neuron sign), along with mixed **acute and chronic denervation** on EMG, is highly characteristic of **Amyotrophic Lateral Sclerosis (ALS)**. - **ALS** is a rapidly progressive neurodegenerative disease, and the typical survival time from diagnosis is **3 to 5 years**, often due to respiratory failure. *Excellent with treatment* - **ALS** is an incurable disease, and current treatments such as **Riluzole** or **Edaravone** only offer a modest slowing of disease progression or symptom management, not an excellent prognosis. - There is no known treatment that can halt or reverse the neurodegeneration characteristic of **ALS**. *Good with supportive care* - While **supportive care** (e.g., respiratory support, physical therapy, nutritional guidance) is essential for managing symptoms and improving quality of life in **ALS**, it does not alter the underlying progressive and fatal nature of the disease. - The relentless degeneration of motor neurons continues despite comprehensive supportive measures, leading to eventual paralysis and death. *Variable depending on subtype* - While there are different clinical presentations (e.g., bulbar vs. limb onset) and genetic forms of **ALS**, the overall prognosis for classic **ALS** is uniformly poor. - Although a small percentage of patients may have a longer survival, the vast majority follow a progressive course with a limited life expectancy, making a

Q: A 48-year-old man presents with progressive weakness in his hands and forearms. He has muscle fasciculations and wasting but normal sensation. EMG shows chronic denervation in C8-T1 distribution. What is the most likely diagnosis?

Motor neuron disease. ***Motor neuron disease*** - The combination of **progressive weakness**, muscle **fasciculations**, and **wasting** with *preserved sensation* is the classic presentation of Amyotrophic Lateral Sclerosis (**ALS**), the most common form of MND. - The EMG findings of chronic denervation in the C8-T1 distribution confirm the **Lower Motor Neuron (LMN)** damage necessary for this diagnosis. *Cervical radiculopathy* - While it can cause weakness in a specific root distribution (C8-T1), it almost invariably presents with **radicular pain** and objective **sensory loss** or paresthesia, which are absent here. - Radiculopathy is usually limited to one or two nerve roots and does not cause the widespread and progressive motor involvement characteristic of MND. *Carpal tunnel syndrome* - This is a **median nerve mononeuropathy** and primarily causes sensory disturbances (tingling/numbness) in the index and middle fingers, often sparing C8-T1 muscles like the ulnar-innervated intrinsic hand muscles. - It is a focal disorder and would not account for the extensive muscle **wasting** and **fasciculations** seen in the forearm. *Ulnar neuropathy* - This is a focal entrapment neuropathy usually causing sensory loss over the medial 1.5 digits and specific intrinsic hand muscle atrophy, not generalized forearm weakness. - Similar to CTS, this highly localized condition is typically associated with **sensory deficits** and does not explain the ongoing progressive nature or pure motor syndrome seen in MND. *Brachial plexopathy* - Damage to the brachial plexus usually results from trauma, inflammation (e.g., neuralgic amyotrophy), or infiltration. - A plexopathy would affect multiple nerve distributions and cause significant **sensory loss** or **intractable pain** in the hand/forearm, features that differentiate it from pure motor disease.

Q: A 57-year-old woman presents with progressive memory loss and behavioral changes. MRI shows frontotemporal atrophy. What is the most likely initial symptom domain affected?

Behavioral changes. ***Behavioral changes***- **Frontotemporal dementia (FTD)**, indicated by **frontotemporal atrophy** on MRI, typically presents with prominent **behavioral or language changes** in its initial stages. - In **behavioral variant FTD (bvFTD)**, early symptoms include progressive changes in personality, social conduct, and executive function, such as **disinhibition**, **apathy**, or **loss of empathy**.*Memory loss*- While memory loss can occur in FTD, it is typically **not the initial or most prominent symptom** in the behavioral variant, differentiating it from Alzheimer's disease.- In bvFTD, **episodic memory** is often relatively preserved in the early stages, with more significant deficits in executive function and social cognition.*Language difficulties*- **Primary progressive aphasia (PPA)** is another major subtype of FTD where language difficulties are the initial and prominent symptom.- However, the question highlights "behavioral changes" as a key presenting feature, which is characteristic of the behavioral variant of FTD, where language issues are usually not primary.*Motor symptoms*- Motor symptoms like parkinsonism, amyotrophy (ALS-like symptoms), or supranuclear gaze palsy can be associated with specific FTD subtypes (e.g., FTD with **motor neuron disease**).- These are generally **later manifestations** or indicate distinct clinical syndromes, not typically the initial domain affected in the most common presentations of bvFTD.*Visual problems*- Visual problems are **not a typical initial symptom domain** in frontotemporal dementia.- Such symptoms are more commonly associated with posterior cortical atrophy (a variant of Alzheimer's disease) or other neurodegenerative conditions affecting visual pathways.

Q: A 48-year-old man presents with progressive memory loss and abnormal movements. He has a family history of similar symptoms. Genetic testing confirms Huntington's disease. What is the mode of inheritance?

Autosomal dominant. ***Autosomal dominant***- Huntington's disease (HD) is caused by a mutation in the **HTT gene** located on **chromosome 4**, and only one mutated copy is sufficient to cause the disease.- This inheritance pattern is characterized by **vertical transmission** (appearing in every generation) and equal prevalence in males and females, which fits the given family history.*Autosomal recessive*- This mode requires **two copies** of the mutated gene for disease expression, meaning individuals typically have unaffected carrier parents.- Autosomal recessive disorders often **skip generations**, which is inconsistent with the clear family history of similar symptoms provided.*X-linked recessive*- The gene is located on the X chromosome, typically affecting **males more severely** and being passed from carrier mothers to sons.- This is ruled out because the gene responsible for Huntington's disease (HTT) is found on an **autosomal chromosome (chromosome 4)**, not an X chromosome.*X-linked dominant*- Affected fathers pass the trait to **all daughters** but no sons, and females are usually more commonly affected than males.- This pattern is not applicable as the Huntington's disease gene is located on an **autosomal chromosome**, not the X chromosome.*Mitochondrial*- These disorders are exclusively **maternally inherited**, meaning only mothers can pass the condition to all their offspring.- The inheritance of Huntington's disease is not solely dependent on maternal lineage and follows a **Mendelian autosomal pattern**.

Q: A 54-year-old man presents with progressive weakness in his hands and arms. He has muscle fasciculations and hyperreflexia. EMG shows both acute and chronic denervation. What is the most likely diagnosis?

Amyotrophic lateral sclerosis. ***Amyotrophic lateral sclerosis*** - This diagnosis is strongly supported by the simultaneous presence of **Upper Motor Neuron (UMN)** signs (**hyperreflexia**) and **Lower Motor Neuron (LMN)** signs (**fasciculations** and weakness). - The **EMG** findings of widespread **acute and chronic denervation** confirm ongoing motor neuron degeneration affecting both UMN and LMN pathways. *Cervical myelopathy* - While this can cause UMN signs (**hyperreflexia**) in the arms and legs, it typically results from focal spinal cord compression and does not cause widespread **fasciculations** or globally progressive LMN signs. - The EMG findings would typically show more focal changes, usually related to specific nerve root levels if compression is involved, rather than the extensive generalized denervation seen here. *Peripheral neuropathy* - Peripheral neuropathies primarily cause **LMN signs** (weakness, reduced/absent reflexes, fasciculations) but would not cause the associated **hyperreflexia** (UMN sign) found in this patient. - Motor and sensory involvement is common, and the pathology is confined to peripheral nerves, lacking evidence of central motor neuron damage. *Myasthenia gravis* - This condition presents with **fluctuating, fatigable weakness** that worsens throughout the day and with repetitive use, unlike the progressive, steady weakness described. - It affects the neuromuscular junction, therefore it does not cause **hyperreflexia** or **fasciculations**, which are signs of motor neuron disease. *Polymyositis* - This is an inflammatory myopathy causing **proximal muscle weakness** (difficulty rising from a chair or lifting objects) and elevated muscle enzymes (CK), but sparing the motor neurons. - Being a muscle disorder (myopathy), it does not cause **hyperreflexia** (UMN sign) or significant **fasciculations** (LMN sign).

Q: A 57-year-old man presents with progressive muscle weakness and difficulty swallowing. EMG shows myopathic changes. Muscle biopsy shows rimmed vacuoles. What is the most likely diagnosis?

Inclusion body myositis. ***Inclusion body myositis*** - The patient's age (57-year-old), **progressive muscle weakness**, difficulty swallowing (dysphagia), and crucial finding of **rimmed vacuoles** on muscle biopsy are pathognomonic for **inclusion body myositis**. - EMG showing **myopathic changes** further supports a primary muscle disorder, and IBM typically involves distal muscles (forearm flexors) and quadriceps, making dysphagia common. *Polymyositis* - While polymyositis causes **proximal muscle weakness** and **myopathic changes** on EMG, it does not typically show **rimmed vacuoles** on muscle biopsy. - It is often associated with immune-mediated inflammation, but the specific biopsy finding guides towards IBM in this case. *Dermatomyositis* - **Dermatomyositis** is characterized by distinct **cutaneous manifestations** (e.g., Gottron's papules, heliotrope rash) in addition to proximal muscle weakness, which are absent in this patient's presentation. - Muscle biopsy in dermatomyositis typically shows perivascular and perimysial inflammation, not **rimmed vacuoles**. *Muscular dystrophy* - Most **muscular dystrophies** are inherited disorders with onset typically in childhood or adolescence, making a new diagnosis at 57 less common for classic forms. - Although they cause **myopathic changes**, the specific presence of **rimmed vacuoles** on biopsy is not a typical feature of most common muscular dystrophies. *Myasthenia gravis* - **Myasthenia gravis** is a **neuromuscular junction disorder**, not a primary muscle disease, and presents with fluctuating weakness that worsens with activity and improves with rest. - EMG in myasthenia gravis would show a **decremental response** on repetitive nerve stimulation, and muscle biopsy would be normal, without **myopathic changes** or **rimmed vacuoles**.

Neurology UK Medical PG Practice Questions and MCQs

Question 1: A 49-year-old man presents with progressive weakness in his arms and legs over 24 months. He has bulbar symptoms including dysphagia and dysarthria. EMG shows widespread denervation. What is the most important prognostic factor?

A. Age at onset
B. Rate of progression
C. Bulbar involvement (Correct Answer)
D. Site of onset
E. Family history

Explanation: ***Bulbar involvement*** - The presence of **bulbar symptoms** (dysphagia and dysarthria) at presentation or early in the disease course is the single most important predictor of shorter survival in **Amyotrophic Lateral Sclerosis (ALS)**. - This is primarily because bulbar dysfunction leads quickly to difficulty swallowing, increasing the risk of **aspiration pneumonia** and malnutrition, and often precedes necessary respiratory intervention. *Age at onset* - While a factor, **older age (>65 years)** at onset is associated with a worse prognosis but is generally considered less influential than the pattern of motor neuron involvement. - Patients with **younger onset** (e.g., in their 40s) tend to have a slightly better prognosis than those with onset in their 70s. *Rate of progression* - The **rate of progression** directly determines the prognosis (survival time) itself, reflecting the speed of motor neuron loss. - However, **bulbar involvement** is often the underlying *predictor* or characteristic that drives a rapid rate of progression, making the bulbar site the more fundamental prognostic factor. *Site of onset* - The specific **site of onset** is critical, distinguishing between **limb-onset** and **bulbar-onset** ALS. - Because bulbar onset conveys the worst prognosis, selecting the specific involvement (**bulbar**) is more precise than selecting the general concept of

Question 2: A 28-year-old woman presents with sudden onset severe headache during exercise. She vomits and has neck stiffness. CT head shows subarachnoid hemorrhage. What is the most likely cause?

A. Arteriovenous malformation
B. Berry aneurysm (Correct Answer)
C. Carotid dissection
D. Hypertensive hemorrhage
E. Trauma

Explanation: ***Berry aneurysm*** - The sudden onset of a severe, explosive **thunderclap headache** coupled with signs of meningeal irritation (vomiting, neck stiffness) and the finding of **subarachnoid hemorrhage (SAH)** on CT head is the classic presentation of a ruptured saccular (**berry**) aneurysm. - Exertion (exercise) acts as a common trigger for aneurysm rupture due to the sudden increase in **intracranial pressure** and transmural wall stress. *Arteriovenous malformation* - AVMs more commonly present with **intraparenchymal hemorrhage** (ICH) or seizures, rather than isolated SAH, especially when triggered by exertion. - While AVMs can cause SAH, they are a less frequent cause of widespread spontaneous SAH compared to ruptured **berry aneurysms**. *Carotid dissection* - Carotid artery dissection typically manifests as severe neck/facial pain, headache, and signs of **cerebral ischemia** (stroke symptoms) due to vessel stenosis or occlusion. - Dissections rarely cause primary, widespread SAH; they are more often associated with **subintimal hemorrhage** leading to stroke or pseudoaneurysm formation. *Hypertensive hemorrhage* - Hemorrhage due to chronic or severe hypertension (hypertensive hemorrhage) almost exclusively causes deep **intraparenchymal hemorrhage** (ICH), usually in the basal ganglia, thalamus, or brainstem. - The primary finding of SAH, rather than ICH and the patient's young age, makes uncontrolled hypertension highly unlikely as the underlying cause. *Trauma* - Although trauma is the single most frequent overall cause of SAH, the clinical history describes a **spontaneous event** triggered by exertion (exercise) without any external injury. - Traumatic SAH is clinically differentiated by the history of a specific injury and usually involves bleeding adjacent to the site of impact.

Question 3: A 41-year-old man presents with progressive weakness in his hands and arms over 12 months. He has muscle fasciculations and hyperreflexia. EMG shows both acute and chronic denervation changes. What is the prognosis?

A. Excellent with treatment
B. Good with supportive care
C. Variable depending on subtype
D. Poor with 3-5 year survival (Correct Answer)
E. Stable with medication

Explanation: ***Poor with 3-5 year survival*** - The presentation with **progressive weakness**, **muscle fasciculations** (lower motor neuron sign), and **hyperreflexia** (upper motor neuron sign), along with mixed **acute and chronic denervation** on EMG, is highly characteristic of **Amyotrophic Lateral Sclerosis (ALS)**. - **ALS** is a rapidly progressive neurodegenerative disease, and the typical survival time from diagnosis is **3 to 5 years**, often due to respiratory failure. *Excellent with treatment* - **ALS** is an incurable disease, and current treatments such as **Riluzole** or **Edaravone** only offer a modest slowing of disease progression or symptom management, not an excellent prognosis. - There is no known treatment that can halt or reverse the neurodegeneration characteristic of **ALS**. *Good with supportive care* - While **supportive care** (e.g., respiratory support, physical therapy, nutritional guidance) is essential for managing symptoms and improving quality of life in **ALS**, it does not alter the underlying progressive and fatal nature of the disease. - The relentless degeneration of motor neurons continues despite comprehensive supportive measures, leading to eventual paralysis and death. *Variable depending on subtype* - While there are different clinical presentations (e.g., bulbar vs. limb onset) and genetic forms of **ALS**, the overall prognosis for classic **ALS** is uniformly poor. - Although a small percentage of patients may have a longer survival, the vast majority follow a progressive course with a limited life expectancy, making a

Question 4: A 48-year-old man presents with progressive weakness in his hands and forearms. He has muscle fasciculations and wasting but normal sensation. EMG shows chronic denervation in C8-T1 distribution. What is the most likely diagnosis?

A. Cervical radiculopathy
B. Motor neuron disease (Correct Answer)
C. Carpal tunnel syndrome
D. Ulnar neuropathy
E. Brachial plexopathy

Explanation: ***Motor neuron disease*** - The combination of **progressive weakness**, muscle **fasciculations**, and **wasting** with *preserved sensation* is the classic presentation of Amyotrophic Lateral Sclerosis (**ALS**), the most common form of MND. - The EMG findings of chronic denervation in the C8-T1 distribution confirm the **Lower Motor Neuron (LMN)** damage necessary for this diagnosis. *Cervical radiculopathy* - While it can cause weakness in a specific root distribution (C8-T1), it almost invariably presents with **radicular pain** and objective **sensory loss** or paresthesia, which are absent here. - Radiculopathy is usually limited to one or two nerve roots and does not cause the widespread and progressive motor involvement characteristic of MND. *Carpal tunnel syndrome* - This is a **median nerve mononeuropathy** and primarily causes sensory disturbances (tingling/numbness) in the index and middle fingers, often sparing C8-T1 muscles like the ulnar-innervated intrinsic hand muscles. - It is a focal disorder and would not account for the extensive muscle **wasting** and **fasciculations** seen in the forearm. *Ulnar neuropathy* - This is a focal entrapment neuropathy usually causing sensory loss over the medial 1.5 digits and specific intrinsic hand muscle atrophy, not generalized forearm weakness. - Similar to CTS, this highly localized condition is typically associated with **sensory deficits** and does not explain the ongoing progressive nature or pure motor syndrome seen in MND. *Brachial plexopathy* - Damage to the brachial plexus usually results from trauma, inflammation (e.g., neuralgic amyotrophy), or infiltration. - A plexopathy would affect multiple nerve distributions and cause significant **sensory loss** or **intractable pain** in the hand/forearm, features that differentiate it from pure motor disease.

Question 5: A 62-year-old man presents with progressive weakness in his arms and legs over 18 months. He has difficulty speaking and swallowing. EMG shows widespread denervation. What is the most important prognostic factor?

A. Age at onset
B. Site of onset
C. Rate of progression
D. Bulbar involvement (Correct Answer)
E. Genetic factors

Explanation: ***Bulbar involvement***- Bulbar involvement, manifesting as **dysphagia** (difficulty swallowing) and **dysarthria** (difficulty speaking), is the single most important adverse prognostic factor in **Amyotrophic Lateral Sclerosis (ALS)**.- Patients with bulbar onset generally have a significantly shorter median survival (often <3 years) than those with limb onset, primarily due to earlier development of **respiratory failure** and aspiration pneumonia.*Age at onset*- Although *older age* (e.g., >60 years) at diagnosis is generally associated with a poorer prognosis, it is less predictive of overall survival time than the specific neuroanatomical site of disease onset.- Younger age at onset is often correlated with a slightly slower disease trajectory, but the presence of bulbar symptoms overrides this factor.*Site of onset*- The site of onset is prognostic (bulbar vs. spinal/limb), but **Bulbar involvement** is specifically highlighted as the poor prognostic indicator because it directly impairs vital functions like swallowing and breathing control.- While *spinal onset* (limb/trunk) is associated with a better prognosis, the focus must remain on the most severe factor, which is the compromise of brainstem functions.*Rate of progression*- A fast **rate of progression** (measured by declining physiological function) is highly predictive of shorter survival, but bulbar involvement is often the *cause* or *primary determinant* of this rapid decline leading to early death.- While important, the rate itself is a consequence, whereas the location of the disease (bulbar) is the fundamental factor dictating the accelerated mortality risk.*Genetic factors*- Specific genetic mutations (e.g., **C9orf72**) can influence the clinical phenotype and prognosis, but they account for only a small percentage (5-10%) of ALS cases (familial).- In the context of sporadic ALS, clinical features such as bulbar involvement are stronger and more relevant predictors of survival for the majority of patients.

Question 6: A 57-year-old woman presents with progressive memory loss and behavioral changes. MRI shows frontotemporal atrophy. What is the most likely initial symptom domain affected?

A. Memory loss
B. Language difficulties
C. Behavioral changes (Correct Answer)
D. Motor symptoms
E. Visual problems

Explanation: ***Behavioral changes***- **Frontotemporal dementia (FTD)**, indicated by **frontotemporal atrophy** on MRI, typically presents with prominent **behavioral or language changes** in its initial stages. - In **behavioral variant FTD (bvFTD)**, early symptoms include progressive changes in personality, social conduct, and executive function, such as **disinhibition**, **apathy**, or **loss of empathy**.*Memory loss*- While memory loss can occur in FTD, it is typically **not the initial or most prominent symptom** in the behavioral variant, differentiating it from Alzheimer's disease.- In bvFTD, **episodic memory** is often relatively preserved in the early stages, with more significant deficits in executive function and social cognition.*Language difficulties*- **Primary progressive aphasia (PPA)** is another major subtype of FTD where language difficulties are the initial and prominent symptom.- However, the question highlights "behavioral changes" as a key presenting feature, which is characteristic of the behavioral variant of FTD, where language issues are usually not primary.*Motor symptoms*- Motor symptoms like parkinsonism, amyotrophy (ALS-like symptoms), or supranuclear gaze palsy can be associated with specific FTD subtypes (e.g., FTD with **motor neuron disease**).- These are generally **later manifestations** or indicate distinct clinical syndromes, not typically the initial domain affected in the most common presentations of bvFTD.*Visual problems*- Visual problems are **not a typical initial symptom domain** in frontotemporal dementia.- Such symptoms are more commonly associated with posterior cortical atrophy (a variant of Alzheimer's disease) or other neurodegenerative conditions affecting visual pathways.

Question 7: A 67-year-old man presents with confusion, falls, and urinary incontinence over 4 months. MRI shows ventricular dilatation with periventricular changes. What is the most appropriate diagnostic test?

A. Lumbar puncture with pressure measurement
B. Large-volume lumbar puncture (Correct Answer)
C. CSF flow studies
D. Intracranial pressure monitoring
E. Cognitive testing

Explanation: ***Large-volume lumbar puncture*** - This procedure, often called the **CSF tap test**, is the primary diagnostic intervention for **Normal Pressure Hydrocephalus (NPH)**, which is characterized by the triad of gait disturbance, urinary incontinence, and dementia. - The removal of 30-50 mL of CSF is performed to assess for **immediate symptomatic improvement**, particularly in **gait dysfunction**, which strongly predicts a positive response to eventual ventriculoperitoneal shunting. *Lumbar puncture with pressure measurement* - While an initial step, **CSF pressure measurement** in NPH typically yields a result within the **normal range** (10-15 mmHg), confirming the "normal pressure" component but not definitively predicting surgical outcome. - Measuring only pressure does not provide the crucial information regarding symptomatic relief achieved by **CSF drainage**, which is necessary for treatment planning. *CSF flow studies* - Studies like **radionuclide cisternography** are used to confirm **abnormal CSF circulation** (e.g., failure of tracer to flow over the cerebral convexities) in NPH, supporting the diagnosis. - Although helpful, these studies are supportive imaging tests and do not directly assess the patient's functional response or **symptom improvement following CSF removal**, which is the primary goal of the tap test. *Intracranial pressure monitoring* - Continuous invasive monitoring is primarily used for evaluating hydrocephalus associated with **elevated intracranial pressure** or to characterize specific pressure waves (e.g., B-waves). - NPH is defined by **normal opening pressure**, meaning monitoring is generally considered secondary or reserved for equivocal or unclear cases after a failed **tap test**. *Cognitive testing* - Cognitive testing (e.g., MMSE or MoCA) is part of the **baseline assessment** to quantify the severity of the **dementia** component of the NPH triad. - This is a measurement tool, not a **diagnostic intervention** to establish the responsiveness of the symptoms to CSF volume reduction, unlike the tap test.

Question 8: A 48-year-old man presents with progressive memory loss and abnormal movements. He has a family history of similar symptoms. Genetic testing confirms Huntington's disease. What is the mode of inheritance?

A. Autosomal recessive
B. Autosomal dominant (Correct Answer)
C. X-linked recessive
D. X-linked dominant
E. Mitochondrial

Explanation: ***Autosomal dominant***- Huntington's disease (HD) is caused by a mutation in the **HTT gene** located on **chromosome 4**, and only one mutated copy is sufficient to cause the disease.- This inheritance pattern is characterized by **vertical transmission** (appearing in every generation) and equal prevalence in males and females, which fits the given family history.*Autosomal recessive*- This mode requires **two copies** of the mutated gene for disease expression, meaning individuals typically have unaffected carrier parents.- Autosomal recessive disorders often **skip generations**, which is inconsistent with the clear family history of similar symptoms provided.*X-linked recessive*- The gene is located on the X chromosome, typically affecting **males more severely** and being passed from carrier mothers to sons.- This is ruled out because the gene responsible for Huntington's disease (HTT) is found on an **autosomal chromosome (chromosome 4)**, not an X chromosome.*X-linked dominant*- Affected fathers pass the trait to **all daughters** but no sons, and females are usually more commonly affected than males.- This pattern is not applicable as the Huntington's disease gene is located on an **autosomal chromosome**, not the X chromosome.*Mitochondrial*- These disorders are exclusively **maternally inherited**, meaning only mothers can pass the condition to all their offspring.- The inheritance of Huntington's disease is not solely dependent on maternal lineage and follows a **Mendelian autosomal pattern**.

Question 9: A 54-year-old man presents with progressive weakness in his hands and arms. He has muscle fasciculations and hyperreflexia. EMG shows both acute and chronic denervation. What is the most likely diagnosis?

A. Cervical myelopathy
B. Amyotrophic lateral sclerosis (Correct Answer)
C. Peripheral neuropathy
D. Myasthenia gravis
E. Polymyositis

Explanation: ***Amyotrophic lateral sclerosis*** - This diagnosis is strongly supported by the simultaneous presence of **Upper Motor Neuron (UMN)** signs (**hyperreflexia**) and **Lower Motor Neuron (LMN)** signs (**fasciculations** and weakness). - The **EMG** findings of widespread **acute and chronic denervation** confirm ongoing motor neuron degeneration affecting both UMN and LMN pathways. *Cervical myelopathy* - While this can cause UMN signs (**hyperreflexia**) in the arms and legs, it typically results from focal spinal cord compression and does not cause widespread **fasciculations** or globally progressive LMN signs. - The EMG findings would typically show more focal changes, usually related to specific nerve root levels if compression is involved, rather than the extensive generalized denervation seen here. *Peripheral neuropathy* - Peripheral neuropathies primarily cause **LMN signs** (weakness, reduced/absent reflexes, fasciculations) but would not cause the associated **hyperreflexia** (UMN sign) found in this patient. - Motor and sensory involvement is common, and the pathology is confined to peripheral nerves, lacking evidence of central motor neuron damage. *Myasthenia gravis* - This condition presents with **fluctuating, fatigable weakness** that worsens throughout the day and with repetitive use, unlike the progressive, steady weakness described. - It affects the neuromuscular junction, therefore it does not cause **hyperreflexia** or **fasciculations**, which are signs of motor neuron disease. *Polymyositis* - This is an inflammatory myopathy causing **proximal muscle weakness** (difficulty rising from a chair or lifting objects) and elevated muscle enzymes (CK), but sparing the motor neurons. - Being a muscle disorder (myopathy), it does not cause **hyperreflexia** (UMN sign) or significant **fasciculations** (LMN sign).

Question 10: A 57-year-old man presents with progressive muscle weakness and difficulty swallowing. EMG shows myopathic changes. Muscle biopsy shows rimmed vacuoles. What is the most likely diagnosis?

A. Polymyositis
B. Dermatomyositis
C. Inclusion body myositis (Correct Answer)
D. Muscular dystrophy
E. Myasthenia gravis

Explanation: ***Inclusion body myositis*** - The patient's age (57-year-old), **progressive muscle weakness**, difficulty swallowing (dysphagia), and crucial finding of **rimmed vacuoles** on muscle biopsy are pathognomonic for **inclusion body myositis**. - EMG showing **myopathic changes** further supports a primary muscle disorder, and IBM typically involves distal muscles (forearm flexors) and quadriceps, making dysphagia common. *Polymyositis* - While polymyositis causes **proximal muscle weakness** and **myopathic changes** on EMG, it does not typically show **rimmed vacuoles** on muscle biopsy. - It is often associated with immune-mediated inflammation, but the specific biopsy finding guides towards IBM in this case. *Dermatomyositis* - **Dermatomyositis** is characterized by distinct **cutaneous manifestations** (e.g., Gottron's papules, heliotrope rash) in addition to proximal muscle weakness, which are absent in this patient's presentation. - Muscle biopsy in dermatomyositis typically shows perivascular and perimysial inflammation, not **rimmed vacuoles**. *Muscular dystrophy* - Most **muscular dystrophies** are inherited disorders with onset typically in childhood or adolescence, making a new diagnosis at 57 less common for classic forms. - Although they cause **myopathic changes**, the specific presence of **rimmed vacuoles** on biopsy is not a typical feature of most common muscular dystrophies. *Myasthenia gravis* - **Myasthenia gravis** is a **neuromuscular junction disorder**, not a primary muscle disease, and presents with fluctuating weakness that worsens with activity and improves with rest. - EMG in myasthenia gravis would show a **decremental response** on repetitive nerve stimulation, and muscle biopsy would be normal, without **myopathic changes** or **rimmed vacuoles**.

Question 11: A 35-year-old woman presents with recurrent episodes of severe headache, nausea, and photophobia. The headaches are preceded by zigzag visual disturbances lasting 20 minutes. What is the most likely diagnosis?

A. Tension headache
B. Cluster headache
C. Migraine with aura (Correct Answer)
D. Trigeminal neuralgia
E. Temporal arteritis

Explanation: ***Migraine with aura***- The description of recurrent, severe headaches with associated **nausea** and **photophobia** is highly characteristic of a primary migraine disorder.- The transient **zigzag visual disturbances** lasting 20 minutes precisely define a classic **migraine visual aura**, which precedes the headache phase.*Tension headache*- This type of headache is typically **mild to moderate**, bilateral, and described as a non-throbbing, tightening sensation around the head.- It lacks associated symptoms like severe nausea, photophobia, and crucially, a preceding **neurological aura**.*Cluster headache*- Cluster headaches are characterized by **excruciatingly severe, unilateral pain** centered around the orbit or temple, lasting 15 to 180 minutes.- They are associated with prominent **autonomic symptoms** (e.g., lacrimation, rhinorrhea, ptosis) on the affected side, which are not mentioned here, and do not feature a visual aura.*Trigeminal neuralgia*- This condition presents with sudden, brief (seconds), intense, **electric shock-like paroxysms of pain** limited to the distribution of the **trigeminal nerve** (V1, V2, or V3).- It is a facial pain disorder, not a generalized headache syndrome associated with nausea, photophobia, or aura.*Temporal arteritis*- This condition (Giant Cell Arteritis) typically affects patients older than 50 years and presents with a new, persistent, **localized headache** often accompanied by **jaw claudication** or vision changes.- The patient's young age (35) and the classic visual aura make this diagnosis extremely unlikely.

Question 12: A 58-year-old man presents with progressive weakness in arms and legs over 18 months. He has bulbar symptoms and fasciculations. EMG shows widespread denervation. What medication may modestly prolong survival?

A. Baclofen
B. Riluzole (Correct Answer)
C. Gabapentin
D. Prednisolone
E. Immunoglobulin

Explanation: ***Riluzole*** - It is the primary (and one of the few) medication proven to **modestly prolong survival** (by about 2-3 months) and slow the progression of **Amyotrophic Lateral Sclerosis (ALS)**. - Its proposed mechanism involves inhibiting **glutamate release**, which is thought to contribute to motor neuron excitotoxicity in the pathogenesis of ALS.*Baclofen* - This is a centrally acting muscle relaxant used primarily for the symptomatic relief of **spasticity** and muscle cramps, which can occur in ALS. - It does not address the underlying neurodegenerative pathology of ALS and has no proven benefit in improving survival or overall disease progression.*Gabapentin* - Primarily used as an **anticonvulsant** or for treating chronic **neuropathic pain** (e.g., peripheral neuropathy). - It offers no disease-modifying benefits in ALS and is confined to managing specific symptoms such as pain or anxiety.*Prednisolone* - A corticosteroid typically used in inflammatory or autoimmune conditions; immunosuppression is not effective in classical **ALS**. - Corticosteroids like prednisolone are generally **contraindicated** in ALS due to the risk of worsening muscle atrophy and weakness.*Immunoglobulin* - Intravenous Immunoglobulin (IVIG) is the mainstay treatment for acute autoimmune neuropathies like **Guillain-Barré syndrome** (GBS) or CIDP, which respond to immunomodulation. - The findings of widespread denervation, bulbar signs, and fasciculations strongly suggest **ALS** (a primary neurodegenerative disorder), for which IVIG is ineffective.

Question 13: A 54-year-old woman presents with progressive memory loss and language difficulties. MRI shows asymmetric temporal lobe atrophy. CSF shows tau elevation but normal amyloid. What is the most likely diagnosis?

A. Alzheimer's disease
B. Frontotemporal dementia (Correct Answer)
C. Lewy body dementia
D. Vascular dementia
E. Creutzfeldt-Jakob disease

Explanation: ***Frontotemporal dementia***- This presentation, dominated by early **language difficulties** (Primary Progressive Aphasia, PPA) along with progressive memory loss, and **asymmetric temporal lobe atrophy** is pathognomonic for the semantic variant of FTD (svPPA).- The critical CSF finding is **normal amyloid (Aβ42)**, which strongly argues against typical Alzheimer's disease pathology, thus favoring FTD, which is linked to tau or **TDP-43 proteinopathies**.*Alzheimer's disease*- While AD causes memory loss, early predominant **language deficits** are less typical; standard AD imaging shows bilateral **hippocampal/posterior cortical atrophy**, not asymmetric temporal atrophy.- Classical AD pathology is associated with abnormal amyloid processing, resulting in **decreased CSF Aβ42** (or elevated Aβ42/Aβ40 ratio), which contradicts the normal amyloid results shown here.*Lewy body dementia*- LBD's core features include **fluctuating cognition**, recurrent **detailed visual hallucinations**, and spontaneous **parkinsonism**; these are absent in the patient's presentation.- Imaging typically shows milder or preserved medial temporal lobes, and CSF findings often differ, sometimes showing only moderate non-specific elevation of tau.*Vascular dementia*- This condition is often characterized by a **stepwise cognitive decline** following cerebrovascular events, commonly affecting executive function before memory.- MRI results characteristic of vascular dementia would show extensive **white matter hyperintensities** or evidence of multiple territorial infarcts, rather than focal, progressive atrophy.*Creutzfeldt-Jakob disease*- CJD is characterized by **rapidly progressive dementia** (dementia progressing over weeks to months) and typically presents with **myoclonus** (startle movements) and ataxia.- MRI findings are usually diffuse, showing characteristic **DWI/FLAIR hyperintensities** in the cortical ribbon and/or basal ganglia, which is distinct from focal asymmetric atrophy.

Question 14: A 63-year-old man presents with progressive memory loss and falls. His wife reports her is out violent dreams. He has visual hallucinations of animals. What is the most likely diagnosis?

A. Alzheimer's disease
B. Parkinson's disease dementia
C. Lewy body dementia (Correct Answer)
D. Vascular dementia
E. Frontotemporal dementia

Explanation: ***Lewy body dementia***- The clinical presentation involves the classic triad of **dementia**, recurrent **visual hallucinations** (often well-formed, non-threatening images like animals), and **parkinsonism** (leading to falls).- The presence of **violent dreams** indicates **REM sleep behavior disorder (RBD)**, which is a highly suggestive supportive feature often preceding or occurring early in the course of LBD.*Alzheimer's disease*- While it causes memory loss, AD is less likely to present early with prominent **visual hallucinations**, significant **parkinsonism** (falls), and **REM sleep behavior disorder**.- AD typically features cortical symptoms like early episodic memory loss, with motor symptoms developing much later in the disease course.*Parkinson's disease dementia*- This diagnosis requires that the **motor symptoms (parkinsonism)** must precede the onset of **dementia** by at least one year (the '**1-year rule**').- Given that the presentation emphasizes memory loss concurrently with falls and other symptoms, LBD is the preferred diagnosis over PDD, though the underlying pathology is similar.*Vascular dementia*- VasD usually presents with a **stepwise decline** in cognition and prominent deficits in **executive function**, often linked to focal ischemic lesions on brain imaging.- **Visual hallucinations**, severe **parkinsonism**, and **RBD** are not characteristic features of pure vascular dementia.*Frontotemporal dementia*- FTD primarily presents with significant changes in **personality** and **social behavior** (behavioral variant) or **language dysfunction** (aphasia).- Memory loss and **falls** may occur, but early visual hallucinations and **RBD** are not typical core diagnostic criteria for FTD.

Question 15: A 27-year-old woman presents with sudden onset severe headache during intercourse. Of head shows subarachnoid hemorrhage. What is the most likely cause?

A. Arteriovenous malformation
B. Berry aneurysm (Correct Answer)
C. Carotid dissection
D. Venous thrombosis
E. Hypertensive hemorrhage

Explanation: ***Berry aneurysm*** - Rupture of a **berry aneurysm** is the single most common cause of non-traumatic **subarachnoid hemorrhage (SAH)**, accounting for about 80% of cases. - The sudden onset of a severe headache (thunderclap headache) immediately following activities that transiently increase blood pressure, such as **intercourse** or straining, is the classic presentation of an aneurysmal rupture. *Arteriovenous malformation* - While AVMs are the second most common cause of SAH, they generally present with associated **intraparenchymal hemorrhage**, seizures, or progressive neurological deficits. - AVM rupture accounts for only a minority of acute, isolated non-traumatic SAH cases compared to **berry aneurysms**. *Carotid dissection* - Carotid dissection typically presents with ipsilateral neck pain, head pain, and features of **cerebral ischemia** (stroke) or **Horner syndrome**. - Isolated SAH is an extremely uncommon presentation of cervical carotid dissection, which primarily involves the vessel wall. *Venous thrombosis* - Cerebral venous thrombosis usually manifests with signs of raised intracranial pressure (severe headache, nausea) and focal deficits secondary to underlying **venous infarction**. - While hemorrhage may occur in the infarcted area, pure SAH is rare unless the event is massive or extends directly into the subarachnoid space. *Hypertensive hemorrhage* - **Hypertensive hemorrhage** is the most common cause of spontaneous **intraparenchymal hemorrhage**, typically affecting areas like the basal ganglia, not predominantly the subarachnoid space. - Such hemorrhages are strongly associated with long-standing, poorly controlled hypertension, which is less likely to be the primary cause of SAH in a young, otherwise healthy patient.

Question 16: A 42-year-old man presents with progressive weakness in his hands and forearms over 12 months. He has muscle fasciculations but preserved reflexes. EMG shows chronic denervation. What is the most likely diagnosis?

A. Cervical myelopathy
B. Progressive muscular atrophy (Correct Answer)
C. Amyotrophic lateral sclerosis
D. Spinal muscular atrophy
E. Inclusion body myositis

Explanation: ***Progressive muscular atrophy***\n - This disorder is a pure **Lower Motor Neuron (LMN)** variant of Motor Neuron Disease (MND), characterized by progressive muscle weakness, **atrophy**, and **fasciculations**.\n - The key differentiating feature from ALS is the sparing of the Upper Motor Neurons (UMNs), which explains why the reflexes are **preserved** (or absent, but not hyperreflexic).\n*Cervical myelopathy*\n - Significant cervical myelopathy typically presents with mixed LMN signs at the level of compression and **UMN signs** (e.g., hyperreflexia) below the level of compression/lesion in the cord.\n - The isolated LMN signs (fasciculations, chronic denervation) without corresponding sensory findings or UMN signs make this diagnosis less likely.\n*Amyotrophic lateral sclerosis*\n - ALS is characterized by degeneration of **both Upper Motor Neurons (UMNs)** and Lower Motor Neurons (LMNs).\n - The diagnosis requires evidence of UMN pathology (e.g., hyperreflexia, spasticity, Babinski sign), which is absent in this patient who has preserved reflexes.\n*Spinal muscular atrophy*\n - While SMA is a pure LMN disease, it is a genetically determined condition primarily characterized by onset in **infancy or childhood** due to loss of the **SMN1 gene**.\n - Adult-onset forms (Type 4) are rare and generally slowly progressive, but the sporadic, isolated LMN presentation in a 42-year-old is classically described as **Progressive Muscular Atrophy (PMA)**.\n*Inclusion body myositis*\n - This is an **inflammatory myopathy** (muscle disease), not a primary motor neuron disease; therefore, it usually lacks prominent features associated with denervation, such as widespread **fasciculations**.\n - IBM classically involves the **quadriceps** and forearm finger flexor muscles, and diagnosis requires confirmation via muscle biopsy showing distinctive rimmed vacuoles.

Question 17: A 47-year-old man presents with progressive muscle weakness affecting his arms and legs. He has muscle fasciculations and hyperreflexia. EMG shows widespread denervation. What is the prognosis?

A. Complete recovery expected
B. Slow progression over decades
C. Stable with treatment
D. Progressive decline over 2-5 years (Correct Answer)
E. Rapid improvement with therapy

Explanation: ***Progressive decline over 2-5 years***- The clinical presentation (simultaneous **upper motor neuron** signs like hyperreflexia and **lower motor neuron** signs like fasciculations and denervation) is classical for **Amyotrophic Lateral Sclerosis (ALS)**.- ALS is a relentlessly progressive and usually fatal neurodegenerative disorder with a median survival time typically ranging from **2 to 5 years** after diagnosis, commonly due to respiratory compromise.*Complete recovery expected*- ALS involves the irreversible destruction of both upper and lower motor neurons; therefore, complete recovery is not possible.- Complete recovery is usually associated with reversible conditions, such as some forms of **Guillain-Barré Syndrome (GBS)**, which typically presents acutely and lacks upper motor neuron signs.*Slow progression over decades*- While disease progression rates vary, especially in less aggressive variants, the typical course of classical ALS is relatively rapid, making progression over 'decades' unlikely.- Conditions that progress over decades are usually highly indolent disorders or some forms of inherited **peripheral neuropathies**.*Stable with treatment*- Current pharmacological treatments for ALS (e.g., **Riluzole**, **Edaravone**) have only a modest effect, slowing the rate of decline, but they do not halt the disease's progression or lead to stability.- The underlying pathology of continuous motor neuron death prevents the disease from entering a treatment-induced stable phase.*Rapid improvement with therapy*- Improvement, especially rapid improvement, is not seen in ALS; therapeutic interventions focus entirely on supportive care and modestly slowing decline.- Rapid improvement is usually a feature of acute, highly treatable conditions, such as immune-mediated neuropathies responding quickly to **plasma exchange** or **IVIG**.

Question 18: A 58-year-old diabetic presents with sudden painless loss of vision in his left eye. Fundoscopy shows a swollen pale optic disc. What is the most likely diagnosis?

A. Central retinal artery occlusion
B. Central retinal vein occlusion
C. Anterior ischemic optic neuropathy (Correct Answer)
D. Diabetic retinopathy
E. Vitreous hemorrhage

Explanation: ***Anterior ischemic optic neuropathy***- The presentation of **sudden, painless loss of vision** in a **diabetic** patient, coupled with a **swollen pale optic disc** on fundoscopy, is highly characteristic of **anterior ischemic optic neuropathy (AION)**.- AION occurs due to **ischemia of the optic nerve head**, often associated with systemic **vascular risk factors** like diabetes and hypertension.*Central retinal artery occlusion*- Fundoscopy typically reveals a **pale retina** with a **cherry-red spot** in the fovea, indicating an occluded central retinal artery, which differs from the described swollen optic disc.- While causing **sudden painless vision loss**, CRAO affects retinal perfusion rather than primarily the optic nerve head.*Central retinal vein occlusion*- Fundoscopy presents with a characteristic "**blood and thunder**" appearance, including **diffuse retinal hemorrhages**, dilated tortuous veins, and **optic disc edema**, which is more extensive than a simple pale, swollen disc.- Vision loss can be sudden or gradual, but the extensive retinal hemorrhage is a key differentiating feature.*Diabetic retinopathy*- While prevalent in diabetics, this condition typically causes **gradual vision loss** and shows signs like **microaneurysms**, **hemorrhages**, **exudates**, and sometimes **neovascularization** on fundoscopy, not an acutely swollen pale optic disc.- Sudden, severe vision loss in diabetic retinopathy is more often due to complications like **vitreous hemorrhage** or **retinal detachment**, which have distinct fundoscopic features.*Vitreous hemorrhage*- This condition causes **sudden vision loss** and on fundoscopy, there would be **obscuration of retinal details** and loss of the red reflex due to blood within the vitreous cavity, rather than a clearly visible swollen optic disc.- It is a common complication of **proliferative diabetic retinopathy**, but the fundoscopic findings are different from those described.

Question 19: A 65-year-old man presents with progressive hearing loss and tinnitus in his right ear. Weber test lateralizes to the left. Rinne test is positive bilaterally. What type of hearing loss is this?

A. Conductive hearing loss
B. Sensorineural hearing loss (Correct Answer)
C. Mixed hearing loss
D. Functional hearing loss
E. Normal hearing

Explanation: ***Sensorineural hearing loss*** - The **Weber test lateralizing to the left ear** indicates a sensorineural deficit in the contralateral (right) ear, as sound is perceived louder in the ear with better **bone conduction** relative to air conduction if the other ear has sensorineural loss. - A **positive Rinne test bilaterally (AC > BC)** confirms that there is no significant conductive component in either ear, supporting sensorineural involvement in the symptomatic right ear.*Conductive hearing loss* - With **conductive hearing loss**, the Weber test would lateralize to the *affected* ear (the right ear in this scenario), due to the **occlusion effect** making bone conduction seem louder. - The Rinne test would be **negative (BC > AC)** in the affected right ear, indicating a problem with sound transmission through the outer or middle ear.*Mixed hearing loss* - **Mixed hearing loss** would involve elements of both conductive and sensorineural loss, meaning the Rinne test would likely be negative in the affected ear. - This condition would present with a combination of conductive and sensorineural findings on audiometry, which is not fully supported by the given test results. *Functional hearing loss* - **Functional hearing loss** (or non-organic hearing loss) is a psychological condition with no organic cause. - This diagnosis is typically made after excluding organic causes and often presents with inconsistent or contradictory audiometric test results, unlike the clear pattern seen here. *Normal hearing* - A patient with **normal hearing** would not present with progressive hearing loss and tinnitus in one ear. - While a positive Rinne bilaterally and non-lateralizing Weber are consistent with normal hearing, the presence of symptoms rules out this option.

Question 20: A 54-year-old man presents with progressive weakness and wasting in his hands. EMG shows chronic denervation in C8-T1 distribution. What is the most likely diagnosis?

A. Cervical radiculopathy
B. Motor neuron disease (Correct Answer)
C. Carpal tunnel syndrome
D. Ulcer neuropathy
E. Brachial plexopathy

Explanation: ***Motor neuron disease***- The presentation of progressive, isolated **motor weakness** and **muscle wasting** in the hands, along with **chronic denervation** in the **C8-T1 distribution** on EMG, is highly characteristic of **Motor Neuron Disease (MND)**, particularly **Amyotrophic Lateral Sclerosis (ALS)**.- MND primarily affects **upper and/or lower motor neurons**, leading to **progressive muscle weakness**, atrophy, and fasciculations without significant sensory involvement.*Cervical radiculopathy*- While cervical radiculopathy can cause weakness and denervation in a specific myotomal distribution (e.g., C8-T1), it typically presents with **radicular pain** and often **sensory deficits** (e.g., paresthesias) in the affected dermatome.- The progressive, widespread nature of motor involvement affecting multiple hand muscles without prominent pain or sensory loss makes it less likely than MND.*Carpal tunnel syndrome*- This condition involves compression of the **median nerve** at the wrist, causing weakness and wasting primarily in the **thenar muscles** and sensory symptoms (numbness, tingling) in the median nerve distribution.- It would not explain the widespread weakness and wasting across the entire C8-T1 distribution in the hands, which includes both median and ulnar innervated muscles.*Ulcer neuropathy* (Assuming Ulnar neuropathy)- **Ulnar neuropathy** typically causes weakness and wasting specific to muscles innervated by the ulnar nerve, such as the **interossei** and **hypothenar eminence muscles**, often accompanied by sensory loss in the ulnar distribution.- It is a focal neuropathy, usually due to entrapment, and would not account for the more diffuse C8-T1 motor denervation affecting median-innervated muscles as well.*Brachial plexopathy*- **Brachial plexopathies** involve damage to the brachial plexus, which can cause weakness and wasting, often affecting a wider territory (proximal and distal) in the arm and hand.- These conditions are frequently associated with significant **sensory loss** and often severe pain, typically having a more acute or subacute onset rather than the described progressive, isolated motor weakness.

Question 21: A 27-year-old man presents with acute psychosis and abnormal movements. He has a family history of similar symptoms. Slit-lamp examination shows brown deposits in the cornea. What is the most likely diagnosis?

A. Schizophrenia
B. Wilson's disease (Correct Answer)
C. Huntington's disease
D. Drug-induced psychosis
E. Bipolar disorder

Explanation: ***Wilson's disease***- The constellation of acute psychosis, abnormal movements (neurological dysfunction), and the pathognomonic finding of **Kayser-Fleischer rings** (brown deposits in the cornea seen on slit-lamp exam) strongly confirms the diagnosis of **Wilson's disease**, an autosomal recessive disorder of copper metabolism.- This inherited condition typically presents in adolescence or early adulthood, causing abnormal **copper deposition** leading to liver damage and neuropsychiatric symptoms such as **dysarthria**, tremor, psychiatric changes, and dystonia.*Schizophrenia*- While psychosis is a key feature, **Schizophrenia** is a primary psychiatric illness that does not cause progressive abnormal movements or the characteristic **Kayser-Fleischer rings** seen in copper storage disorders.- Psychiatric symptoms in Wilson's disease can mimic schizophrenia, but the presence of objective neurological signs and KF rings rules out a diagnosis of primary schizophrenia.*Huntington's disease*- Huntington's disease is characterized by progressive **chorea**, psychological changes, and dementia, but it is an **autosomal dominant** disorder and usually presents later in life (30s–50s).- This condition does not involve **copper accumulation** and therefore does not cause **Kayser-Fleischer rings**. *Drug-induced psychosis*- Drug-induced psychosis is an acute toxicology finding and would not explain the patient's strong **family history** or the presence of the chronic, specific deposit of copper in the cornea (**Kayser-Fleischer rings**).- It generally presents only with psychiatric symptoms and lacks the objective neurological findings (abnormal movements) seen here. *Bipolar disorder*- Bipolar disorder is a primary mood disorder characterized by cyclical episodes of mania and depression, sometimes involving psychosis.- It does not cause progressive neurological deterioration, **abnormal movements**, or the systemic finding of copper deposition and **Kayser-Fleischer rings**.

Question 22: A 58-year-old man presents with progressive weakness in his hands over 8 months. He has muscle wasting and fasciculations but no sensory symptoms. What is the most likely diagnosis?

A. Cervical myelopathy
B. Motor neuron disease (Correct Answer)
C. Peripheral neuropathy
D. Carpal tunnel syndrome
E. Myasthenia gravis

Explanation: ***Motor neuron disease*** - Progressive weakness in hands, muscle wasting, and **fasciculations** without sensory symptoms are classic signs of **lower motor neuron (LMN) involvement**, highly characteristic of **Motor Neuron Disease (MND)**, particularly **Amyotrophic Lateral Sclerosis (ALS)**. - The absence of sensory symptoms is a key differentiating feature, as MND is a pure **motor disorder** affecting upper and/or lower motor neurons, distinguishing it from most neuropathies or myelopathies. *Cervical myelopathy* - Although it can cause progressive hand weakness, it typically involves **upper motor neuron (UMN) signs** (e.g., hyperreflexia, spasticity) and often includes **sensory deficits** or neck/arm pain, which are absent here. - Widespread **fasciculations** are not a primary feature, and the absence of sensory signs makes MND more probable. *Peripheral neuropathy* - This usually involves both motor and sensory fibers, leading to characteristic **stocking-glove sensory loss** (numbness, paresthesias) along with motor symptoms, which are not described in this case. - While there are rare pure motor neuropathies, the combination of widespread **fasciculations** and progressive course suggests an ongoing degeneration of anterior horn cells (MND). *Carpal tunnel syndrome* - This is a localized compression neuropathy of the median nerve, predominantly manifesting as **sensory symptoms** (numbness/tingling) in the first three fingers. - Weakness and wasting are limited to the **thenar muscles** and would not cause the progressive, widespread fasciculations described. *Myasthenia gravis* - This neuromuscular junction disorder causes **fluctuating weakness** that worsens with exertion and improves with rest, often affecting ocular and bulbar muscles first. - Crucially, it does not cause **muscle wasting** or **fasciculations**, as it is a functional disorder of transmission, not a disease leading to nerve or muscle degeneration.

Question 23: A 72-year-old man presents with confusion, falls, and urinary incontinence over 3 months. MRI shows ventricular dilatation with normal cortical sulci. What is the most likely diagnosis?

A. Alzheimer's disease
B. Vascular dementia
C. Normal pressure hydrocephalus (Correct Answer)
D. Lewy body dementia
E. Frontotemporal dementia

Explanation: ***Normal pressure hydrocephalus*** - The presentation of **confusion** (dementia), **falls** (gait disturbance), and **urinary incontinence** constitutes the classic **Hakim triad**, which is highly characteristic of Normal Pressure Hydrocephalus (NPH). - The MRI finding of **ventricular dilatation** with **normal cortical sulci** is pathognomonic, indicating an expansion of the ventricles without significant cortical atrophy. *Alzheimer's disease* - Typically presents with insidious and progressive **memory impairment**, particularly episodic memory, followed by other cognitive deficits. - MRI in Alzheimer's usually shows prominent **cortical atrophy**, especially in the **medial temporal lobes** and hippocampus, which is absent here. *Vascular dementia* - Characterized by a **stepwise cognitive decline** often associated with a history of cerebrovascular events or risk factors like hypertension and diabetes. - Imaging reveals evidence of **infarcts** or extensive white matter ischemic changes, which are not described in the MRI findings. *Lewy body dementia* - Differentiated by the presence of recurrent, well-formed **visual hallucinations**, fluctuating cognition, and features of **parkinsonism**. - While falls can occur, the full **Hakim triad** along with the specific MRI findings point away from this diagnosis. *Frontotemporal dementia* - Primarily manifests with early changes in **behavior** (e.g., disinhibition, apathy) or progressive **language deficits** (aphasia). - Gait disturbance and incontinence are not typical early symptoms, and MRI often shows focal atrophy of the **frontal or temporal lobes**, not isolated ventricular dilatation.

Question 24: A 65-year-old man presents with progressive weakness in his arms and legs over 6 months. He has difficulty swallowing and his speech is slurred. On examination, there is muscle wasting, fasciculations, and hyperreflexia. What is the most likely diagnosis?

A. Multiple sclerosis
B. Myasthenia gravis
C. Motor neuron disease (Correct Answer)
D. Guillain-Barré syndrome
E. Cervical myelopathy

Explanation: ***Motor neuron disease*** - The co-existence of **Upper Motor Neuron (UMN)** signs (hyperreflexia) and **Lower Motor Neuron (LMN)** signs (wasting, fasciculations) in the limbs, along with **bulbar symptoms** (dysphagia, slurred speech), is the classic presentation of **Amyotrophic Lateral Sclerosis (ALS)**, the most common form of MND.- The progression of symptoms over 6 months is consistent with the relentless, neurodegenerative nature of this disease.*Multiple sclerosis* - MS is characterized by episodic or progressive central nervous system demyelination that predominantly causes **UMN signs** (spasticity) and lacks LMN signs such as **muscle wasting** and **fasciculations**.- It typically involves sensory, visual, or cerebellar pathways and does not present with this constellation of diffuse UMN/LMN/bulbar deficits simultaneously.*Myasthenia gravis* - MG causes fluctuating, fatigable muscle weakness, mediated by **acetylcholine receptor antibodies**, but it is a disorder of the neuromuscular junction, not the motor neurons.- Key differentiating features are the absence of **wasting**, **fasciculations**, and **hyperreflexia**.*Guillain-Barré syndrome* - GBS is an **acute** demyelinating process characterized by rapidly ascending paralysis and purely **LMN signs** (e.g., severe weakness and **areflexia**).- The 6-month progressive course and the presence of hyperreflexia rule out this typically acute and monophasic illness.*Cervical myelopathy* - Cervical myelopathy can cause mixed UMN/LMN signs, but it rarely causes diffuse, symmetrical progression and is typically localized, lacking the characteristic **bulbar involvement** (dysphagia, dysarthria) seen here.

Question 25: A 40-year-old woman presents with recurrent episodes of severe headache lasting 4-12 hours, associated with nausea, vomiting, and photophobia. The headaches are preceded by visual aura consisting of zigzag lines. What is the most likely diagnosis?

A. Tension headache
B. Cluster headache
C. Migraine with aura (Correct Answer)
D. Temporal arteritis
E. Subarachnoid hemorrhage

Explanation: ***Migraine with aura*** - The presentation of recurrent, severe headaches lasting 4-12 hours, accompanied by **nausea**, **vomiting**, and **photophobia**, meets the primary criteria for a migraine. - The presence of a preceding **visual aura** (e.g., scintillating scotomas or zigzag lines) confirms the specific diagnosis of **migraine with aura**.*Tension headache* - Tension headaches are typically **mild to moderate**, bilateral, and described as a non-pulsatile **tightening or pressure**. - They are generally not associated with severe autonomic features like **nausea** and **vomiting**, nor do they present with an aura.*Cluster headache* - Cluster headaches are characterized by extremely severe, **unilateral pain** in the orbital, supraorbital, or temporal regions, lasting 15 to 180 minutes. - They are associated with **ipsilateral cranial autonomic symptoms** (e.g., lacrimation, miosis, rhinorrhea) but generally **do not involve aura**.*Temporal arteritis* - This condition typically affects patients over the age of **50** and is associated with systemic inflammation, **jaw claudication**, and **tender temporal arteries**. - It does not present with recurrent episodes preceded by the **classic visual aura** seen in this patient.*Subarachnoid hemorrhage* - SAH presents as a sudden, maximal intensity **“thunderclap” headache** and is not typically recurrent or preceded by an aura. - It is a medical emergency frequently associated with signs of **meningismus** (nuchal rigidity) or altered mental status.

Question 26: A 70-year-old man presents with sudden onset weakness of his right face, arm, and leg. He is unable to speak but appears to understand commands. CT head shows no hemorrhage. What type of stroke is this most likely to be?

A. Lacunar stroke
B. Posterior circulation stroke
C. Total anterior circulation stroke (Correct Answer)
D. Partial anterior circulation stroke
E. Transient ischemic attack

Explanation: ***Total anterior circulation stroke***- The patient's presentation with sudden onset **dense right-sided weakness** (face, arm, leg) and **expressive aphasia** (unable to speak but understands commands) indicates a significant lesion affecting a large part of the cerebral hemisphere.- This clinical picture includes both dense motor/sensory deficit and higher cortical dysfunction (aphasia), fulfilling the diagnostic criteria for a **Total Anterior Circulation Stroke (TACS)**, typically involving the proximal **Middle Cerebral Artery** or internal carotid artery. *Lacunar stroke*- **Lacunar strokes** typically result in pure motor, pure sensory, or ataxic hemiparesis, but *do not* involve **cortical signs** such as aphasia, neglect, or homonymous hemianopia.- These strokes are caused by **small vessel disease** affecting deep brain structures like the internal capsule or basal ganglia, not the extensive cortical areas implied by the patient's symptoms. *Posterior circulation stroke*- Symptoms of a **posterior circulation stroke** often include **ataxia**, vertigo, nystagmus, diplopia, cranial nerve palsies, or **crossed deficits** (e.g., facial weakness on one side, body weakness on the other).- The specific combination of dense hemiparesis and aphasia is highly indicative of **anterior circulation** involvement, not typically seen in isolated posterior circulation events. *Partial anterior circulation stroke*- A **Partial Anterior Circulation Stroke (PACS)** involves **two of the three** major TACS criteria (e.g., motor/sensory deficit plus higher cortical dysfunction, or motor/sensory deficit plus homonymous hemianopia) or isolated higher cortical dysfunction.- This patient's presentation with both dense motor/sensory deficits and aphasia suggests a more extensive lesion covering all three components, making TACS a more fitting diagnosis. *Transient ischemic attack*- A **Transient Ischemic Attack (TIA)** is characterized by **transient neurological symptoms** that resolve completely, by definition within 24 hours, without evidence of acute infarction on imaging.- The description of sudden onset and sustained weakness implies an ongoing or established stroke, not a transient event, as there is no mention of symptom resolution.

Question 27: A 45-year-old man presents with progressive weakness in his hands, difficulty with fine motor tasks, and muscle twitching. On examination, he has muscle wasting in his hands with fasciculations and hyperreflexia. What is the most likely diagnosis?

A. Carpal tunnel syndrome
B. Cervical myelopathy
C. Motor neuron disease (Correct Answer)
D. Peripheral neuropathy
E. Myasthenia gravis

Explanation: ***Motor neuron disease*** - The combination of **progressive weakness**, **muscle wasting** and **fasciculations** (Lower Motor Neuron signs) with **hyperreflexia** (Upper Motor Neuron signs) is the hallmark presentation of **Motor Neuron Disease (MND)**, most commonly **Amyotrophic Lateral Sclerosis (ALS)**. - This condition involves the degeneration of both upper and lower motor neurons, accounting for the mixed neurological findings observed in the patient. *Carpal tunnel syndrome* - **Carpal tunnel syndrome** is a focal compression neuropathy of the **median nerve**, typically causing **numbness**, tingling, and weakness primarily in the thumb, index, and middle fingers. - It is characterized by isolated **thenar atrophy** and does not present with widespread **fasciculations** or **hyperreflexia**, which indicate a more extensive neurological process. *Cervical myelopathy* - **Cervical myelopathy** results from **spinal cord compression**, typically leading to **Upper Motor Neuron (UMN)** signs (like **hyperreflexia** and spasticity) below the lesion, often accompanied by sensory changes and gait disturbance. - While it can present with some mixed features, the prominent and diffuse **fasciculations** indicative of widespread Lower Motor Neuron involvement are less characteristic than in MND. *Peripheral neuropathy* - **Peripheral neuropathies** primarily affect peripheral nerves, leading to **Lower Motor Neuron (LMN)** signs such as weakness and wasting, but they characteristically cause **hyporeflexia** or **areflexia**. - The presence of **hyperreflexia** in this patient is a crucial finding that effectively rules out a pure peripheral nerve disorder. *Myasthenia gravis* - **Myasthenia gravis** is an autoimmune disorder of the **neuromuscular junction** causing fluctuating muscle weakness that **worsens with activity** and improves with rest, often affecting ocular and bulbar muscles. - It does not cause muscle **wasting** or **fasciculations**, and reflexes typically remain normal, making it inconsistent with the patient's presentation.

Question 28: A 55-year-old man presents with sudden onset diplopia and ptosis affecting his left eye. On examination, his left pupil is dilated and non-reactive to light. Eye movements show limitation in all directions. What is the most likely diagnosis?

A. Myasthenia gravis
B. Third cranial nerve palsy (Correct Answer)
C. Horner's syndrome
D. Fourth cranial nerve palsy
E. Sixth cranial nerve palsy

Explanation: ***Third cranial nerve palsy***- The constellation of **ptosis**, a **dilated and non-reactive pupil**, and **limitation in eye movements** in multiple directions affecting one eye is the hallmark of an **oculomotor nerve (CN III) palsy**.- The involvement of the pupil suggests a **compressive lesion**, such as an **aneurysm** (e.g., posterior communicating artery), which compromises the superficial parasympathetic fibers of CN III.*Myasthenia gravis*- While **ptosis** and **diplopia** are common in myasthenia gravis, the ophthalmoplegia typically **fluctuates** throughout the day and **spares the pupils**.- The **dilated and non-reactive pupil** in this case is a critical differentiating feature that rules out myasthenia gravis.*Horner's syndrome*- Horner's syndrome results from sympathetic pathway disruption, characterized by a triad of mild **ptosis**, **miosis** (constricted pupil), and facial **anhydrosis**.- The patient's **dilated pupil** directly contradicts the **miosis** seen in Horner's syndrome.*Fourth cranial nerve palsy*- A **fourth cranial nerve (trochlear nerve) palsy** affects the **superior oblique muscle**, leading to **vertical diplopia** and difficulty looking down and in.- It does not cause **ptosis**, widespread **extraocular muscle limitation**, or **pupillary abnormalities**, which are prominent in this patient's presentation.*Sixth cranial nerve palsy*- A **sixth cranial nerve (abducens nerve) palsy** affects the **lateral rectus muscle**, causing **horizontal diplopia** due to impaired abduction (outward gaze) of the affected eye.- This condition does not typically cause **ptosis**, a **dilated pupil**, or generalized limitation of eye movements as described.

Question 29: A 65-year-old woman presents with gradual onset hearing loss and tinnitus in her left ear over 6 months. Weber test lateralizes to the right ear. Rinne test is positive bilaterally. What type of hearing loss is this?

A. Conductive hearing loss
B. Sensorineural hearing loss (Correct Answer)
C. Mixed hearing loss
D. Functional hearing loss
E. Normal hearing

Explanation: ***Sensorineural hearing loss*** - The **Weber test** lateralizes to the **unaffected ear** (right ear), which is characteristic of unilateral sensorineural hearing loss because the better cochlea perceives the sound more clearly. - The **Rinne test is positive** (Air Conduction > Bone Conduction) bilaterally, indicating that sound transmission through the outer and middle ear is intact, consistent with a problem in the inner ear or auditory nerve. *Conductive hearing loss* - If this were **conductive hearing loss** in the left ear, the **Weber test** would lateralize to the **affected ear** (left ear) due to the occlusion effect. - Conductive hearing loss in the affected ear would result in a **negative Rinne test** (Bone Conduction > Air Conduction) in that ear, which contradicts the bilateral positive Rinne results. *Mixed hearing loss* - **Mixed hearing loss** involves both conductive and sensorineural components. While a positive Rinne test can occur, the clear lateralization of Weber to the *unaffected* ear strongly points to pure sensorineural loss. - In mixed hearing loss, the conductive component would typically alter the Weber test's lateralization pattern to some extent, or at least suggest a more complex picture than purely SNHL. *Functional hearing loss* - **Functional hearing loss** is a non-organic hearing impairment. The tuning fork test results (Weber lateralizing away from the symptomatic ear and positive Rinne bilaterally) are consistent and indicative of an **organic pathology**. - There are no indications in the clinical scenario (such as inconsistent test results or disproportionate speech understanding) to suggest a non-organic cause. *Normal hearing* - This option is incorrect because the patient presents with **gradual onset hearing loss and tinnitus** in the left ear, which are symptoms of hearing impairment. - While a positive Rinne test is consistent with normal hearing, the **Weber test would not lateralize** to either side if hearing were normal and symmetrical.

Question 30: A 42-year-old man presents with progressive weakness in his arms and legs over 18 months. He has muscle fasciculations, hyperreflexia, and bulbar symptoms including dysarthria. EMG shows widespread denervation. What is the most likely diagnosis?

A. Multiple sclerosis
B. Myasthenia gravis
C. Motor neuron disease (Correct Answer)
D. Guillain-Barré syndrome
E. Cervical myelopathy

Explanation: ***Motor neuron disease*** - This diagnosis is strongly indicated by the presence of both **Upper Motor Neuron (UMN)** signs (hyperreflexia) and **Lower Motor Neuron (LMN)** signs (fasciculations, widespread denervation on EMG). - The 18-month progressive weakness involving the limbs and the presence of **bulbar symptoms** like dysarthria are hallmark features of **Amyotrophic Lateral Sclerosis (ALS)**, the most common form of MND. *Multiple sclerosis* - MS is characterized by **demyelinating lesions** in the central nervous system, causing symptoms that are disseminated in time and space, and typically involves sensory, visual, or cerebellar deficits, not purely motor system degeneration. - It does not typically present with **fasciculations** or widespread **LMN signs** of denervation on EMG, and while UMN signs can be present, the combination seen here is atypical. *Myasthenia gravis* - This condition causes **fluctuating muscle weakness** that worsens with activity and improves with rest, often affecting ocular, bulbar, and limb muscles, but it does not cause **hyperreflexia** (UMN signs) or **fasciculations** (LMN signs). - The pathophysiology involves impaired **neuromuscular transmission**, not a primary motor neuron pathology leading to widespread denervation as evidenced by the EMG. *Guillain-Barré syndrome* - GBS is characterized by an **acute, rapidly progressive ascending paralysis** that evolves over days to a few weeks, which is inconsistent with the 18-month chronic progression described. - It is exclusively a **lower motor neuron disease**, presenting with **areflexia** and flaccid weakness, and specifically lacks any **hyperreflexia** (UMN signs). *Cervical myelopathy* - While cervical myelopathy can cause a combination of UMN signs (below the lesion) and LMN signs (at the level of compression), it typically leads to more localized weakness and sensory changes. - It does not usually result in generalized **widespread denervation** throughout the body and significant **bulbar involvement** (dysarthria) as a primary feature, which strongly points towards a diffuse motor neuron disorder.

Question 31: A 54-year-old woman presents with recurrent episodes of severe headache lasting 4-12 hours, associated with nausea and photophobia. The headaches are preceded by visual aura consisting of zigzag lines. What is the most likely diagnosis?

A. Tension headache
B. Cluster headache
C. Migraine with aura (Correct Answer)
D. Temporal arteritis
E. Subarachnoid hemorrhage

Explanation: ***Migraine with aura***- The patient's presentation with **recurrent, severe headaches** lasting 4-12 hours, accompanied by **nausea** and **photophobia**, is characteristic of migraine.- The presence of **visual aura** consisting of **zigzag lines** (a classic **scintillating scotoma**) definitively points to **migraine with aura**.*Tension headache*- These headaches are typically **mild to moderate** intensity, bilateral, and described as a non-pulsating, tightening or pressing sensation.- They usually lack associated symptoms like **nausea** or vomiting, and by definition, they do not include a preceding neurological aura.*Cluster headache*- This is characterized by **excruciatingly severe, unilateral pain** (typically orbital or temporal) but lasts only 15 minutes to 3 hours, much shorter than this patient's episodes.- They are associated with prominent ipsilateral cranial autonomic features, such as **lacrimation**, rhinorrhea, **ptosis**, and lid swelling, which are not mentioned here.*Temporal arteritis*- This condition, typically seen in individuals over 50, presents with a **new onset, persistent localized headache** and systemic features like jaw claudication or elevated ESR/CRP.- The headache is generally persistent rather than recurrent and episodic, and visual symptoms are usually acute visual loss due to **optic nerve ischemia**, not transient zigzag lines.*Subarachnoid hemorrhage*- This presents as a **sudden-onset, maximal intensity headache**—often described as the "worst headache of life" ("thunderclap headache")—and is an acute catastrophe.- It is not characterized by recurrent, episodic attacks over years, which is typical for primary headache disorders like migraine.

Question 32: A 47-year-old man presents with progressive weakness in his hands over 6 months. He has difficulty with fine motor tasks and notices muscle wasting. EMG shows chronic denervation in a C8-T1 distribution. What is the most likely diagnosis?

A. Carpal tunnel syndrome
B. Cervical radiculopathy
C. Motor neuron disease (Correct Answer)
D. Thoracic outlet syndrome
E. Ulnar neuropathy

Explanation: ***Motor neuron disease*** - This patient's **progressive weakness** in the hands over 6 months, difficulty with fine motor tasks, and **muscle wasting** are characteristic features of **Amyotrophic Lateral Sclerosis (ALS)**, the most common form of motor neuron disease. - **EMG findings of chronic denervation in a C8-T1 distribution** affecting multiple muscles, in the absence of sensory signs, strongly indicate a widespread **anterior horn cell** pathology, which is the hallmark of MND. *Carpal tunnel syndrome* - This is a **focal median neuropathy** affecting sensation in the thumb, index, and middle fingers, and causing weakness/wasting predominantly of the **thenar muscles**. - The extensive chronic denervation on EMG in a broad **C8-T1 distribution** affecting various hand muscles is inconsistent with a single focal nerve entrapment. *Cervical radiculopathy* - **Cervical radiculopathy** typically presents with **pain and sensory changes** along a dermatome, often preceding or co-occurring with motor weakness in the corresponding myotome (e.g., C8-T1). - The patient's presentation primarily emphasizes progressive motor weakness and muscle wasting without prominent pain or sensory symptoms, which is atypical for nerve root compression. *Thoracic outlet syndrome* - This condition involves compression of the **brachial plexus** or subclavian vessels, which can cause weakness and wasting in a C8-T1 distribution (Klumpke type). - However, the onset is often more acute or related to specific postures, and the diffuse, relentless progression and widespread chronic denervation are more suggestive of a generalized process like MND. *Ulnar neuropathy* - **Ulnar neuropathy** causes numbness/tingling in the **4th and 5th fingers** and weakness/wasting of **hypothenar** and most intrinsic hand muscles. - As a **focal mononeuropathy**, its EMG findings would be limited to the ulnar nerve's distribution distal to the compression site, not the diffuse C8-T1 chronic denervation described.

Question 33: A 62-year-old man presents with progressive memory loss, confusion, and behavioral changes over 6 months. MRI shows generalized atrophy. CSF shows elevated tau protein and decreased amyloid-β42. What is the most likely diagnosis?

A. Vascular dementia
B. Alzheimer's disease (Correct Answer)
C. Frontotemporal dementia
D. Lewy body dementia
E. Normal pressure hydrocephalus

Explanation: ***Alzheimer's disease*** - The clinical presentation of progressive **memory loss**, confusion, and behavioral changes over 6 months, combined with generalized atrophy on MRI, is highly suggestive of **Alzheimer's disease (AD)**. - The characteristic cerebrospinal fluid (CSF) findings—**elevated tau protein** (reflecting neuronal degeneration) and **decreased amyloid-β42** (reflecting amyloid plaque deposition)—are key biomarkers for AD. *Vascular dementia* - This diagnosis typically presents with a **stepwise cognitive decline** and often focal neurological deficits following cerebrovascular events, rather than a gradual progression focused on memory loss. - Neuroimaging usually reveals specific **infarcts** or extensive white matter lesions, not just generalized atrophy, and CSF biomarkers are not typically elevated tau and decreased amyloid-β42. *Frontotemporal dementia* - Often characterized by prominent early **behavioral disturbances** (e.g., disinhibition, apathy) or **language difficulties** (aphasia), with memory often relatively preserved initially. - CSF biomarkers for tau and amyloid-β42 are generally **normal** or less specific in frontotemporal dementia compared to AD. *Lewy body dementia* - Key distinguishing features include recurrent, well-formed **visual hallucinations**, spontaneous **Parkinsonism**, and significant fluctuations in attention and cognition. - While amyloid-β42 can be reduced, the presence of **elevated tau protein** in CSF, combined with the absence of the core clinical features, makes AD more likely. *Normal pressure hydrocephalus* - Characterized by the classic triad of **gait disturbance** (often magnetic gait), **urinary incontinence**, and **dementia**, with gait disturbance usually being a prominent early feature. - MRI typically shows **ventriculomegaly** disproportionate to sulcal atrophy, and CSF analysis does not show the characteristic biomarker pattern of elevated tau and decreased amyloid-β42.

Question 34: A 29-year-old woman presents with sudden onset severe headache during sexual intercourse. She has no focal neurological signs but is photophobic. CT head shows subarachnoid hemorrhage. What is the most appropriate immediate management?

A. Surgical clipping
B. Endovascular coiling
C. Conservative management
D. Lumbar puncture
E. Nimodipine and aneurysm securement (Correct Answer)

Explanation: ***Nimodipine and aneurysm securement***- This option includes the two critical immediate interventions for confirmed SAH: securing the source (clipping or coiling) to prevent re-bleeding, and starting **Nimodipine** to prevent vasospasm.- **Nimodipine**, a calcium channel blocker, is initiated immediately (up to 96 hours) upon diagnosis to prevent delayed cerebral ischemia due to **vasospasm**, which is the leading cause of morbidity after SAH.*Surgical clipping*- Clipping is one method for definitive securement of the aneurysm but does not include mention of the vital need for concurrent and immediate **vasospasm** prophylaxis using **Nimodipine**.- **Surgical clipping** is typically chosen for aneurysms with wide necks or specific anatomic locations less suitable for coiling.*Endovascular coiling*- **Coiling** is often the less invasive, preferred method chosen for definitive aneurysm securement but fails to encompass the essential role of concurrent Nimodipine in the comprehensive immediate management plan.- Immediate securement is necessary to mitigate the high risk of **re-bleeding** (especially within the first 24 hours), which is associated with high mortality.*Conservative management*- This is inappropriate management for SAH confirmed on CT, as the high risk of **re-bleeding** and **vasospasm** necessitates urgent intervention.- Immediate aggressive care, including securing the source and medical management like blood pressure control and **Nimodipine**, is mandated.*Lumbar puncture*- **Lumbar puncture (LP)** is a diagnostic tool used only when SAH is suspected clinically (thunderclap headache) but the initial non-contrast CT scan is negative or indeterminate.- Since the CT scan *confirmed* SAH in this patient, LP is unnecessary and may delay the initiation of crucial life-saving interventions and aneurysm securement.

Question 35: A 57-year-old man presents with progressive memory loss and language difficulties over 10 months. MRI shows asymmetric frontotemporal atrophy. CSF shows elevated tau but normal amyloid-β42. What is the most likely diagnosis?

A. Alzheimer's disease
B. Frontotemporal dementia (Correct Answer)
C. Lewy body dementia
D. Vascular dementia
E. Creutzfeldt-Jakob disease

Explanation: ***Frontotemporal dementia*** - The combination of **progressive language difficulties** (suggesting a primary progressive aphasia variant of FTD) and **asymmetric frontotemporal atrophy** on MRI is highly indicative of this diagnosis, aligning with the patient's 10-month progression of symptoms. - The CSF finding of **normal amyloid-β42** is crucial, as it argues against typical Alzheimer's disease, leaving FTD as the most likely diagnosis given the neuroanatomical localization and clinical picture. *Alzheimer's disease* - Typical AD initially presents with prominent **episodic memory loss** and MRI usually demonstrates primary atrophy in the **medial temporal lobes** (hippocampi), not the frontotemporal regions. - The classic CSF profile for AD requires **lowered amyloid-β42** (reflecting deposition into plaques) alongside elevated total tau, which is inconsistent with the normal amyloid-β42 level seen here. *Lewy body dementia* - This condition is characterized by core features including early and persistent **visual hallucinations**, **fluctuating cognition** (attention), and features of parkinsonism, which are not described in the patient. - While cognitive decline is present, the specific pattern of **language difficulties** and focal **frontotemporal atrophy** points away from Lewy body dementia. *Vascular dementia* - Vascular dementia typically presents with a **stepwise decline** in cognitive function, often related to multiple strokes or lacunar infarcts, and usually has a history of cerebrovascular risk factors. - The MRI would show extensive evidence of **cerebrovascular disease** (infarcts or diffuse white matter hyperintensities) rather than primary asymmetric lobar atrophy. *Creutzfeldt-Jakob disease* - CJD is characterized by an extremely **rapidly progressive** course (dementia often develops over weeks or a few months, not 10 months) accompanied by myoclonus, ataxia, or visual disturbance. - MRI is highly sensitive, often showing pathognomonic **diffusion restriction** in the cortex (**cortical ribboning**) or basal ganglia, which is inconsistent with the focal atrophy described.

Question 36: A 50-year-old man presents with progressive weakness in his arms and legs over 18 months. He has muscle fasciculations, hyperreflexia, and bulbar symptoms. EMG shows widespread denervation. What is the prognosis?

A. Complete recovery expected
B. Slow progression over decades
C. Stable course with proper treatment
D. Progressive decline over 2-5 years (Correct Answer)
E. Rapid deterioration within months

Explanation: ***Progressive decline over 2-5 years***- The clinical presentation with **progressive weakness**, combined **upper motor neuron (hyperreflexia)** and **lower motor neuron (fasciculations, widespread denervation)** signs, and **bulbar symptoms** is highly characteristic of **Amyotrophic Lateral Sclerosis (ALS)**.- ALS is a rapidly progressive neurodegenerative disease, with the majority of patients experiencing a fatal outcome, typically due to **respiratory failure**, within **2 to 5 years** from symptom onset.*Complete recovery expected*- ALS is a **universally fatal** neurodegenerative disorder with no known cure, characterized by the irreversible degeneration of motor neurons.- Therefore, expecting complete recovery is incorrect; the disease course is one of continuous and irreversible progression.*Slow progression over decades*- While some rare variants or other motor neuron diseases (e.g., Primary Lateral Sclerosis) may have a slower course, typical sporadic ALS progresses rapidly over a few years, not decades.- The 18-month history of progressive weakness and the classic constellation of UMN/LMN signs are inconsistent with a very prolonged, decades-long progression.*Stable course with proper treatment*- Current treatments for ALS, such as **riluzole** and **edaravone**, offer only modest benefits, typically extending survival by a few months, and do not halt the progression or stabilize the disease.- Although supportive care improves quality of life, the underlying neurodegeneration ensures a continuous and ultimately terminal decline.*Rapid deterioration within months*- While ALS progression rates can vary, a typical course leading to death usually spans **2 to 5 years**, not just a few months.- Deterioration within a few months would suggest an exceptionally aggressive variant or an alternative acute condition, which is less consistent with the described **18-month progressive history**.

Question 37: A 36-year-old woman presents with sudden onset severe occipital headache during sex intercourse. CT head shows subarachnoid hemorrhage. What is the most likely underlying cause?

A. Arteriovenous malformation
B. Berry aneurysm (Correct Answer)
C. Carotid dissection
D. Venous thrombosis
E. Hypertensive hemorrhage

Explanation: ***Berry aneurysm*** - Rupture of a **berry (saccular) aneurysm** is the leading cause (85%) of non-traumatic subarachnoid hemorrhage (SAH), presenting as acute, severe, "thunderclap" headache. - SAH caused by aneurysm rupture is classically precipitated by a sudden spike in **intracranial pressure** or blood pressure related to straining, such as during the **Valsalva maneuver** associated with sexual intercourse. *Arteriovenous malformation* - While AVMs can cause SAH, they are a less frequent cause than ruptured aneurysms, and often present with non-hemorrhagic symptoms like focal deficits or seizures. - Hemorrhage from an AVM is typically more likely to be a combination of **intraparenchymal** and subarachnoid bleeding, rather than isolated SAH. *Carotid dissection* - Carotid dissections typically present with severe headache and neck pain, often accompanied by signs of **cerebral ischemia** (stroke) due to thromboembolism. - This condition rarely causes isolated SAH; the hemorrhage is usually intramural or secondary to infarction. *Venous thrombosis* - Cerebral venous thrombosis usually manifests with a subacute or progressive headache profile, often leading to **venous infarcts** and secondary parenchymal hemorrhage. - It is an atypical cause for a sudden, thunderclap headache leading directly to primary SAH. *Hypertensive hemorrhage* - Severe, **chronic hypertension** is the leading cause of non-aneurysmal **intraparenchymal hemorrhage** (ICH), usually affecting the basal ganglia or thalamus. - Isolated SAH is not the standard presentation for hypertensive bleeding unless the deep parenchymal bleed extends secondarily into the subarachnoid space.

Question 38: A 52-year-old diabetic man presents with sudden onset painless loss of vision in his right eye. Fundoscopy shows a pale, swollen optic disc with retinal hemorrhages. What is the most likely diagnosis?

A. Central retinal artery occlusion
B. Central retinal vein occlusion
C. Anterior ischemic optic neuropathy (Correct Answer)
D. Diabetic retinopathy
E. Retinal detachment

Explanation: ***Anterior ischemic optic neuropathy*** - This condition presents with **sudden, painless monocular vision loss** and includes the pathognomonic fundoscopic signs of a **swollen, pale optic disc** and **peripapillary hemorrhages**. - **Diabetes mellitus** is a significant vascular risk factor contributing to Non-arteritic Anterior Ischemic Optic Neuropathy (NAION), which is caused by inadequate blood supply (infarction) to the optic nerve head. *Central retinal artery occlusion* - Fundoscopy typically shows a **cherry-red spot** (intact choroidal circulation visible through the pale retina) and generalized **retinal opacity**, not primarily a pale, swollen optic disc. - Vision loss is often more profound (light perception only) and results from blockage of the main **retinal arterial supply**. *Central retinal vein occlusion* - Although it causes disc swelling and sudden painless vision loss, the fundus image classically shows a "blood and thunder" appearance with **widespread, diffuse retinal hemorrhages** in all four quadrants. - In CRVO, the venous congestion and hemorrhage are the dominant features, often overshadowing the findings of focal disc pallor characteristic of AION. *Diabetic retinopathy* - Vision loss from typical diabetic retinopathy is usually **gradual**; sudden loss is often due to secondary events like **vitreous hemorrhage** or tractional retinal detachment. - Early signs include microaneurysms and exudates, and it does not typically present with acute, isolated **ischemic optic disc swelling**. *Retinal detachment* - Patients usually complain of preceding symptoms like **flashes of light (photopsias)** and floaters, followed by a **curtain-like shadow** in the visual field. - Fundoscopy reveals the retina to be visibly **elevated, taut, or wrinkled**, which is distinct from the primary optic nerve head pathology seen here.

Question 39: A 28-year-old woman presents with sudden onset severe headache during intercourse. She has no focal neurological signs but is photophobic. CT head is normal. What is the most appropriate next investigation?

A. MRI brain
B. Lumbar puncture (Correct Answer)
C. CT angiogram
D. Carotid Doppler
E. EEG

Explanation: ***Lumbar puncture*** - The presentation of a **sudden onset severe headache** during intercourse, described as a **thunderclap headache**, is highly concerning for a **Subarachnoid Hemorrhage (SAH)**, even if the non-contrast CT head is normal, especially if the CT was performed more than 6 hours after symptom onset or if the headache is very severe. - The most appropriate next investigation to definitively rule out SAH after a negative CT scan is a **lumbar puncture** to test for **xanthochromia** and red blood cells in the **cerebrospinal fluid (CSF)**. *MRI brain* - While MRI can detect subtle bleeds and other causes of thunderclap headache like **Reversible Cerebral Vasoconstriction Syndrome (RCVS)**, it is generally less sensitive than a well-timed lumbar puncture for detecting subarachnoid blood immediately following symptom onset. - MRI may be considered later if SAH is ruled out by LP and other secondary causes are still being investigated, but it is not the primary next step to exclude SAH. *CT angiogram* - A **CT angiogram (CTA)** is primarily used to identify the source of bleeding (e.g., an **aneurysm**) *after* the diagnosis of SAH has been confirmed by initial CT or lumbar puncture. - It is not the initial test to confirm the presence of blood in the **CSF**, nor is it indicated before SAH has been definitively ruled in or out. *Carotid Doppler* - **Carotid Doppler ultrasound** is a non-invasive imaging technique used to assess the **carotid arteries** for conditions like **stenosis** or **dissection**. - While **carotid dissection** can cause headaches, it is not the most common cause of a thunderclap headache requiring immediate investigation for SAH, and Doppler is not the standard immediate diagnostic step. *EEG* - **Electroencephalography (EEG)** measures brain electrical activity and is used predominantly in the evaluation of **seizures** or **encephalopathy**. - It has no role in the acute diagnosis or workup of a thunderclap headache, as it does not detect intracranial hemorrhage or vascular abnormalities.

Question 40: A 58-year-old man presents with progressive weakness in his arms and legs over 18 months. He has muscle fasciculations, hyperreflexia, and bulbar symptoms including dysarthria and dysphagia. EMG shows widespread denervation. What is the prognosis?

A. Complete recovery expected
B. Slow progression over decades
C. Stable course with proper treatment
D. Progressive decline over 2-5 years (Correct Answer)
E. Rapid deterioration within months

Explanation: ***Progressive decline over 2-5 years*** - The clinical presentation of **progressive weakness**, **muscle fasciculations**, **hyperreflexia**, and **bulbar symptoms** (dysarthria, dysphagia) with widespread denervation on EMG is characteristic of **Amyotrophic Lateral Sclerosis (ALS)**. - The typical prognosis for ALS is a **median survival of 2 to 5 years** from symptom onset, with death commonly resulting from **respiratory failure**. *Complete recovery expected* - ALS is a **neurodegenerative disease** that is relentlessly progressive and ultimately fatal. - There is **no known cure** for ALS, and complete recovery is not possible. *Slow progression over decades* - The progression of ALS is typically more aggressive than **over decades**, which would imply a much slower course. - Conditions with such a prolonged course are usually different forms of **neuropathy** or some less severe **myopathies**, not ALS. *Stable course with proper treatment* - Currently, there is **no treatment that stabilizes or halts the progression** of ALS; medications like Riluzole and Edaravone offer only a modest slowing of the disease. - The disease characteristically leads to **progressive functional decline** despite therapeutic interventions. *Rapid deterioration within months* - While ALS is progressive, **rapid deterioration within months** from symptom onset is less common for the typical disease course, especially given the 18-month history. - Such an extremely swift decline might be seen in very rare, aggressive variants or other acute conditions, but not standard ALS.

Question 41: A 27-year-old woman presents with sudden onset severe headache during sexual intercourse. CT head shows subarachnoid hemorrhage. What is the most likely underlying cause?

A. Arteriovenous malformation
B. Berry aneurysm (Correct Answer)
C. Carotid dissection
D. Venous sinus thrombosis
E. Hypertensive hemorrhage

Explanation: ***Berry aneurysm*** - The sudden, extremely severe headache (often termed a **thunderclap headache**) occurring during physical exertion like sexual intercourse is the classic presentation of a ruptured **saccular (berry) aneurysm**. - These aneurysms, typically located on the **Circle of Willis**, rupture following transient increases in cerebral blood pressure and wall stress during strenuous activities associated with **Valsalva maneuvers**. *Arteriovenous malformation* - While AVMs are a known cause of SAH, their rupture often results in both SAH and concomitant **intraparenchymal hemorrhage**, or they may present with focal deficits or seizures. - Rupture of a berry aneurysm is statistically the most common cause of non-traumatic SAH, particularly when triggered precisely by acute exertion. *Carotid dissection* - Carotid dissection typically presents with unilateral head/neck pain and signs of **cerebral ischemia** (stroke symptoms) or features of **Horner's syndrome**. - Dissection causes vessel wall injury leading to thrombosis and subsequent ischemic stroke, rather than the primary cause of isolated, large-volume subarachnoid hemorrhage. *Venous sinus thrombosis* - VST usually presents with a subacute or progressive headache, papilledema, and potential focal neurologic deficits or seizures due to venous outflow obstruction. - Although VST can rarely cause secondary hemorrhage, it is usually **intraparenchymal/venous infarction**, and not the primary cause of classic, exertion-triggered SAH. *Hypertensive hemorrhage* - Primary hypertensive hemorrhage is the most frequent cause of spontaneous **intraparenchymal hemorrhage** (ICH), commonly affecting the basal ganglia or pons. - This diagnosis is unlikely in a young patient (27 years old) presenting with isolated SAH, as ICH is typically associated with chronic, uncontrolled **hypertension**.

Question 42: A 68-year-old man presents with progressive memory loss and parkinsonian features. He has visual hallucinations of people and animals. His symptoms fluctuate significantly throughout the day. What is the most likely diagnosis?

A. Alzheimer's disease
B. Parkinson's disease with dementia
C. Lewy body dementia (Correct Answer)
D. Vascular dementia
E. Frontotemporal dementia

Explanation: ***Lewy body dementia***- This diagnosis is strongly suggested by the core diagnostic features: progressive **memory loss**, spontaneous **parkinsonism**, recurrent, detailed **visual hallucinations** (often of people and animals), and significant **fluctuating cognition** throughout the day.- LBD is definitively characterized histologically by the presence of **alpha-synuclein** inclusions (*Lewy bodies*) in the cerebral cortex and brainstem.*Alzheimer's disease*- The primary presentation of AD is typically insidious and progressive decline in **memory** and executive function, often without early or prominent motor symptoms.- While visual hallucinations can occur in later stages of AD, neither significant cognitive fluctuation nor early, prominent **visual hallucinations** are characteristic features.*Parkinson's disease with dementia*- The definitive criterion for PDD is that the onset of **motor symptoms** must precede the development of dementia by at least **one year** (the "one-year rule").- Although PDD involves both motor and cognitive decline, the early co-occurrence of dementia, parkinsonism, and profound **visual hallucinations** points away from PDD and towards LBD.*Vascular dementia*- This condition typically presents with an abrupt or **step-wise decline** in cognitive function, strongly linked to a history of strokes or **cerebrovascular disease**.- Symptoms often reflect focal brain injury, resulting in specific **focal neurological deficits** or significant executive dysfunction, which contrasts with the global symptoms seen here.*Frontotemporal dementia*- FTD classically presents with initial changes in **behavior** (e.g., apathy, disinhibition) or severe language impairment (aphasia), rather than primary memory loss or parkinsonism.- The severe, early, recurrent **visual hallucinations** and fluctuating cognition seen in this patient are not typical features of any FTD subtype.

Question 43: A 42-year-old man presents with progressive weakness in his hands and forearms. He has muscle wasting and fasciculations but preserved reflexes. Sensory examination is normal. EMG shows chronic denervation. What is the most likely diagnosis?

A. Cervical radiculopathy
B. Motor neuron disease (Correct Answer)
C. Peripheral neuropathy
D. Myasthenia gravis
E. Inclusion body myositis

Explanation: ***Motor neuron disease***- This diagnosis is strongly suggested by the progressive **muscle wasting**, **weakness**, and **fasciculations** (signs of lower motor neuron degeneration) restricted to the motor system.- The crucial differentiating features are the **normal sensory examination** and **preserved reflexes**, along with EMG showing **chronic denervation** without primary myopathic changes.*Cervical radiculopathy*- Would typically present with **radicular pain** and often involves **sensory changes** (paresthesias or sensory loss) in a specific dermatome.- EMG abnormalities would be restricted to muscles innervated by the specific affected **nerve root**, not multiple, potentially unrelated, muscle groups in hands and forearms.*Peripheral neuropathy*- Characteristically causes both motor and **sensory symptoms** (numbness, paresthesias), often in a **stocking-glove distribution**, which are absent here.- Deep tendon reflexes are typically **reduced or absent** (hyporeflexia or areflexia), contradicting the preserved reflexes observed in this patient.*Myasthenia gravis*- Characterized by **fluctuating and fatigable weakness** that worsens with sustained activity and improves with rest, but without **muscle atrophy** or **fasciculations**.- EMG shows a **decremental response** on repetitive nerve stimulation, not the chronic denervation changes consistent with motor neuron disease.*Inclusion body myositis*- This is an inflammatory myopathy (muscle disease), so EMG would show **myopathic changes** (short duration, small amplitude motor unit potentials), not the chronic denervation changes described.- While it can cause distal forearm weakness and spares sensory function, it typically affects the **quadriceps** early and reflexes may be impaired, unlike the preserved reflexes here.

Question 44: A 71-year-old man presents with confusion, falls, and urinary incontinence developing over 4 months. MRI shows ventricular dilatation with periventricular white matter changes. What is the most likely diagnosis?

A. Alzheimer's disease
B. Normal pressure hydrocephalus (Correct Answer)
C. Vascular dementia
D. Lewy body dementia
E. Frontotemporal dementia

Explanation: ***Normal pressure hydrocephalus*** - The classic triad of **Normal Pressure Hydrocephalus (NPH)** includes **gait disturbance** (falls), **dementia** (confusion), and **urinary incontinence**, all present in this patient. - The MRI findings of **ventricular dilatation** with **periventricular white matter changes** are characteristic of NPH, indicating CSF accumulation without increased intracranial pressure. *Alzheimer's disease* - Typically presents with **insidious memory loss** as the primary symptom, with gait disturbance and incontinence occurring much later in the disease course. - MRI would classically show **cortical atrophy**, especially of the **hippocampus** and medial temporal lobes, rather than just ventricular dilatation. *Vascular dementia* - Often presents with a **stepwise decline** in cognitive function, reflecting a history of multiple cerebrovascular events, and may include focal neurological deficits. - While periventricular white matter changes can be seen, the specific NPH clinical triad with primarily enlarged ventricles is less characteristic as a primary diagnosis. *Lewy body dementia* - Core features include **fluctuating cognition**, recurrent detailed **visual hallucinations**, and spontaneous **Parkinsonism**. These are not described as prominent features in this case. - Although urinary incontinence can occur, it's typically alongside the other defining features, which are absent here. *Frontotemporal dementia* - Characterized by early and prominent changes in **behavior** (e.g., disinhibition, apathy) or **language function** (aphasia), rather than memory or a triad involving gait and incontinence. - MRI typically shows selective **frontal and temporal lobe atrophy**, not isolated ventricular dilatation with periventricular white matter changes.

Question 45: A 56-year-old man presents with progressive weakness in his hands and forearms over 8 months. He has muscle wasting and fasciculations but no sensory symptoms. Upper motor neuron signs are absent. What is the most likely diagnosis?

A. Motor neuron disease (Correct Answer)
B. Cervical myelopathy
C. Peripheral neuropathy
D. Myasthenia gravis
E. Polymyositis

Explanation: ***Motor neuron disease***- The presentation of progressive, pure motor weakness, **muscle wasting**, and **fasciculations** without sensory involvement or **upper motor neuron (UMN) signs** (such as spasticity or hyperreflexia) strongly suggests a Motor Neuron Disease (MND), particularly the Progressive Muscular Atrophy subtype which is purely **lower motor neuron (LMN)**.- MND is characterized by the degeneration of motor neurons in the spinal cord and brainstem, leading to these **LMN signs** and ultimately muscle denervation, atrophy, and weakness.*Cervical myelopathy*- This condition involves spinal cord compression, typically causing a mix of **UMN signs** (e.g., hyperreflexia, spasticity) and **sensory deficits** (numbness, tingling) below the level of compression, which are absent in this case.- While it can cause hand weakness and wasting due to LMN damage at the compression site, the absence of **sensory changes** or widespread UMN signs makes MND a more fitting diagnosis.*Peripheral neuropathy*- Peripheral neuropathies affect peripheral nerves, commonly resulting in a combination of **sensory symptoms** (numbness, paresthesias) and motor weakness, often in a **stocking-glove distribution**.- The pure motor presentation and diffuse **fasciculations** are highly characteristic of an anterior horn cell disorder (MND) rather than a peripheral nerve disorder, which typically involves both motor and sensory fibers.*Myasthenia gravis*- This is a neuromuscular junction disorder characterized by **fluctuating, fatigable weakness** that improves with rest, often affecting ocular, bulbar, or proximal limb muscles first.- Myasthenia gravis does not typically cause **muscle wasting** or **fasciculations**, which are prominent and progressive features in the patient's presentation.*Polymyositis*- This is an inflammatory myopathy that primarily causes **symmetrical proximal muscle weakness** (shoulders and hips), making activities like standing or lifting arms difficult.- Polymyositis affects the muscle fibers themselves, not the anterior horn cells, therefore **fasciculations** are absent, and it does not present with the widespread muscle wasting seen in MND.

Question 46: A 72-year-old woman presents with sudden onset weakness of her right arm and face, and inability to speak. CT head shows acute infarct in the left middle cerebral artery territory. She presents 6 hours after symptom onset. What is the most appropriate treatment?

A. Aspirin
B. Alteplase
C. Mechanical thrombectomy (Correct Answer)
D. Clopidogrel
E. Heparin

Explanation: ***Mechanical thrombectomy*** - This procedure is indicated for patients with acute stroke due to **large vessel occlusion (LVO)**, such as the MCA territory infarct seen here. - Current guidelines recommend mechanical thrombectomy up to 6 hours after symptom onset, and even up to **24 hours** in carefully selected patients who meet criteria based on advanced imaging (e.g., demonstrating a small core infarct/large **penumbra**). *Aspirin* - Aspirin is an antiplatelet agent used for acute stroke management when reperfusion therapies (thrombolysis/thrombectomy) are contraindicated, or after successful reperfusion to prevent recurrence. - It is not the definitive acute reperfusion treatment required for a symptomatic **large vessel occlusion** at this presentation time. *Alteplase* - The acceptable time window for intravenous thrombolysis with **Alteplase (rtPA)** is generally restricted to 0 to **4.5 hours** after symptom onset. - Since the patient presented at 6 hours, the standard window for IV thrombolysis has expired, making mechanical thrombectomy the preferred reperfusion option if an LVO is confirmed. *Clopidogrel* - Clopidogrel is an antiplatelet medication primarily utilized for the **secondary prevention** of stroke, often in combination with aspirin (dual antiplatelet therapy) for short periods. - It is not an acute reperfusion therapy and would not address the acute **vessel occlusion** causing the symptoms, unlike thrombectomy. *Heparin* - Systemic anticoagulation (like Heparin) is generally not recommended for the routine management of acute ischemic stroke due to the increased risk of **hemorrhagic transformation**. - Anticoagulants are reserved for specific circumstances, such as treating cerebral venous thrombosis or documented arterial dissection, not acute anterior circulation strokes like this MCA infarct.

Question 47: A 44-year-old woman presents with sudden onset severe headache, diplopia, and ptosis. CT shows subarachnoid hemorrhage. CT angiogram reveals a posterior communicating artery aneurysm. What cranial nerve is most likely affected?

A. Second (optic)
B. Third (oculomotor) (Correct Answer)
C. Fourth (trochlear)
D. Fifth (trigeminal)
E. Sixth (abducens)

Explanation: ***Third (oculomotor)*** - The **Oculomotor nerve (CN III)** travels in close proximity to the junction of the internal carotid artery and the **Posterior Communicating Artery (PCoA)**. - An expanding PCoA aneurysm specifically compresses CN III, leading to **ptosis** (paralysis of levator palpebrae superioris), **diplopia** (paralysis of most extraocular muscles), and often a dilated pupil (parasympathetic fiber compression). *Second (optic)* - Lesions of the **Optic nerve (CN II)** primarily result in **visual field defects**, reduced visual acuity, or blindness, but they do not cause diplopia or ptosis. - The nerve's anatomical location is superior and more anterior, making it less susceptible to direct compression by a PCoA aneurysm. *Fourth (trochlear)* - Compression of the **Trochlear nerve (CN IV)** impairs the superior oblique muscle, resulting in vertical and torsional **diplopia**, especially when looking down and in. - Damage to CN IV does not cause ptosis, and it is usually spared in isolated PCoA compression because its course is superior to CN III. *Fifth (trigeminal)* - The **Trigeminal nerve (CN V)** is responsible for sensation of the face and motor function for mastication. - Involvement of CN V causes facial numbness or pain, not deficits in eye movement or eyelid position like ptosis or diplopia. *Sixth (abducens)* - Damage to the **Abducens nerve (CN VI)** paralyzes the lateral rectus muscle, causing isolated horizontal **diplopia** and an inability to abduct the affected eye. - While CN VI can be affected by increased intracranial pressure associated with SAH, it does not cause ptosis, which is a key clinical finding indicating CN III involvement.

Question 48: A 52-year-old man presents with progressive weakness in his hands over 6 months. He has difficulty with fine motor tasks and notices muscle wasting. EMG shows chronic denervation in a C8-T1 distribution. What is the most likely diagnosis?

A. Carpal tunnel syndrome
B. Cervical radiculopathy
C. Motor neuron disease (Correct Answer)
D. Thoracic outlet syndrome
E. Ulnar neuropathy

Explanation: ***Motor neuron disease*** - The progressive **hand weakness** over 6 months, difficulty with **fine motor tasks**, and significant **muscle wasting** in the hands are classic features of **Motor Neuron Disease (MND)**, particularly **Amyotrophic Lateral Sclerosis (ALS)**. - EMG showing **chronic denervation** in the C8-T1 distribution strongly indicates degeneration of **anterior horn cells** (lower motor neurons), which are the primary pathology in MND, affecting the muscles supplied by these segments. *Carpal tunnel syndrome* - This condition is caused by **median nerve compression** at the wrist, leading predominantly to **numbness** and **tingling** in the first three and a half digits, with possible **thenar muscle atrophy** in later stages. - The extensive **chronic denervation** across the entire C8-T1 distribution, as shown by EMG, is much broader than the isolated median nerve involvement characteristic of carpal tunnel syndrome. *Cervical radiculopathy* - **Cervical radiculopathy** results from compression of a **cervical nerve root**, typically causing **neck pain** radiating into the arm, **sensory deficits**, and weakness in a specific myotome. - While C8 radiculopathy can affect hand muscles, the purely motor, relentlessly progressive course with prominent widespread **muscle wasting** without significant pain or sensory symptoms is more suggestive of a primary motor neuron disorder. *Thoracic outlet syndrome* - **Neurogenic Thoracic Outlet Syndrome (TOS)** involves compression of the **brachial plexus** (often the lower trunk, C8-T1) leading to hand **muscle wasting** (Gilliatt-Sumner hand) and sensory symptoms. - However, the severe and diffuse **chronic denervation** and the relentless progressive nature of the weakness, without the positional exacerbations or specific sensory patterns often seen in TOS, point away from this diagnosis. *Ulnar neuropathy* - **Ulnar neuropathy** specifically affects muscles supplied by the ulnar nerve, such as the **hypothenar muscles** and **interossei**, leading to characteristic **'claw hand'** deformity and sensory loss in the little finger and half of the ring finger. - The clinical presentation of weakness and the EMG findings indicating denervation in the entire **C8-T1 distribution** are more widespread than would be expected from an isolated ulnar nerve lesion.

Question 49: A 56-year-old man with a history of alcohol excess presents with confusion, ataxia, and nystagmus. He is given IV thiamine and shows rapid improvement. What was the most likely initial diagnosis?

A. Alcohol withdrawal
B. Wernicke's encephalopathy (Correct Answer)
C. Korsakoff's psychosis
D. Hepatic encephalopathy
E. Cerebellar stroke

Explanation: ***Wernicke's encephalopathy*** - This diagnosis is strongly supported by the classic triad of symptoms: **confusion** (encephalopathy), **ataxia**, and **nystagmus** (or other ophthalmoplegia) in a patient with chronic **alcohol excess**.- The rapid improvement following the administration of IV **thiamine** is characteristic, as Wernicke's encephalopathy is caused by acute deficiency of thiamine (Vitamin B1).*Alcohol withdrawal*- Primary symptoms include autonomic hyperactivity such as **tachycardia**, **tremors**, hypertension, and potential hallucinations or seizures (delirium tremens).- While confusion may occur in severe alcohol withdrawal, the specific triad of nystagmus and ataxia strongly points toward Wernicke's, and **benzodiazepines**, not thiamine, are the primary agents for acute withdrawal.*Korsakoff's psychosis*- This condition is the chronic form following Wernicke's encephalopathy, characterized mainly by **severe anterograde and retrograde amnesia** and **confabulation**.- It typically does not involve the acute ocular symptoms or global confusion seen in the initial presentation.*Hepatic encephalopathy*- This condition results from advanced liver failure (common in alcoholics) and leads to altered mental status, often accompanied by **asterixis** (flapping tremor).- Although confusion is present, the specific combination of ataxia and nystagmus is less characteristic of hepatic encephalopathy, and treatment involves lowering **ammonia** levels, not IV thiamine.*Cerebellar stroke*- A stroke would present with the **sudden onset** of neurological deficits, including ataxia and potentially nystagmus, often accompanied by severe headache or vertigo.- Crucially, stroke symptoms are structural and irreversible in the short term, meaning they would not resolve rapidly with a nutritional supplement like **IV thiamine**.

Question 50: A 38-year-old woman presents with sudden onset severe occipital headache during sexual intercourse. CT head is normal. What is the most appropriate next investigation?

A. MRI brain
B. Lumbar puncture (Correct Answer)
C. CT angiogram
D. Carotid Doppler
E. EEG

Explanation: ***Lumbar puncture*** - This clinical presentation (sudden, severe headache during exertion—**thunderclap headache**) is characteristic of **subarachnoid hemorrhage (SAH)**, mandating investigation even if the initial non-contrast CT head is normal. - **Lumbar puncture** is necessary to look for **xanthochromia** (pigments from hemoglobin breakdown), which effectively confirms SAH, especially when the CT scan is negative or performed >6 hours after symptom onset. *MRI brain* - While useful for detecting non-hemorrhagic causes of thunderclap headache (e.g., **reversible cerebral vasoconstriction syndrome (RCVS)**), **MRI is inferior to LP** for detecting small amounts of acute SAH. - The primary immediate goal is ruling out the highly lethal diagnosis, **subarachnoid hemorrhage**, for which LP is the necessary confirmatory step following a negative CT. *CT angiogram* - **CT angiogram** is used to identify the underlying vascular lesion, such as a **saccular aneurysm**, *after* the diagnosis of SAH has been confirmed by either CT or LP. - It is not the appropriate *initial* confirmatory test for the presence of blood in the subarachnoid space itself. *Carotid Doppler* - This investigation is primarily used to evaluate for **carotid artery stenosis** or fibromuscular dysplasia, which are not typical causes of isolated thunderclap headache. - It assesses blood flow in the extracranial neck vessels and does not play a role in the urgent ruling out of an acute intracerebral bleed like **SAH**. *EEG* - **EEG** (Electroencephalogram) is utilized primarily for the diagnosis of **seizure disorders**, seizure monitoring, or assessing encephalopathies. - It has no utility in the urgent initial evaluation or diagnosis of a patient presenting with an acute **thunderclap headache**.

Question 51: A 72-year-old man presents with progressive memory loss and gait disturbance over 6 months. MRI shows ventricular dilatation with normal cortical sulci. Opening pressure on lumbar puncture is 8 cmH₂O. What is the most likely diagnosis?

A. Alzheimer's disease
B. Normal pressure hydrocephalus (Correct Answer)
C. Vascular dementia
D. Parkinson's disease
E. Progressive supranuclear palsy

Explanation: ***Normal pressure hydrocephalus***- The patient's presentation of progressive **memory loss** (dementia) and **gait disturbance**, combined with MRI showing **ventricular dilatation with normal cortical sulci** and a **normal CSF opening pressure** (8 cmH₂O), is the classic diagnostic triad and findings for **Normal Pressure Hydrocephalus (NPH)**.- NPH is a potentially **reversible cause of dementia**, and the imaging finding of prominent ventricles with preserved cortical sulci, often described as "tight high convexity," is crucial for diagnosis.*Alzheimer's disease*- While Alzheimer's disease causes progressive **memory loss**, MRI typically demonstrates significant **cortical atrophy**, particularly of the medial temporal lobes and hippocampus, which is contrary to the normal cortical sulci observed here.- Gait disturbance usually appears much later in the disease, and the CSF findings are not consistent with the primary pathology of **amyloid plaques** and neurofibrillary tangles.*Vascular dementia*- This diagnosis requires evidence of significant **cerebrovascular disease** such as multiple infarcts or extensive white matter lesions on MRI, which are not described in this case.- The cognitive decline in vascular dementia is often characterized by a **stepwise pattern** of deterioration rather than the gradual progression seen here.*Parkinson's disease*- Parkinson's disease is primarily a **movement disorder** characterized by **bradykinesia**, **resting tremor**, and rigidity, not initially by progressive memory loss and hydrocephalus.- Although dementia can occur, it is typically later in the disease course (Parkinson's Disease Dementia), and the MRI findings of ventricular dilatation with normal sulci are not typical for Parkinson's.*Progressive supranuclear palsy*- This atypical parkinsonism is characterized by prominent **vertical gaze palsy** (supranuclear ophthalmoplegia), axial rigidity, and early falls, symptoms not reported in this patient.- While some atrophy may be seen, the specific imaging pattern of **ventricular enlargement with normal cortical sulci** and normal CSF pressure is not characteristic of PSP.

Question 52: A 58-year-old man with diabetes presents with sudden loss of vision in his right eye. Fundoscopy shows a pale, swollen optic disc with flame-shaped hemorrhages. What is the most likely diagnosis?

A. Central retinal artery occlusion
B. Central retinal vein occlusion
C. Anterior ischemic optic neuropathy (Correct Answer)
D. Diabetic retinopathy
E. Vitreous hemorrhage

Explanation: ***Anterior ischemic optic neuropathy*** - The clinical presentation of **sudden loss of vision** in a diabetic patient, coupled with fundoscopic findings of a **pale, swollen optic disc** and **flame-shaped hemorrhages**, is characteristic of **anterior ischemic optic neuropathy (AION)**. - AION results from **ischemia of the optic nerve head**, often seen in individuals with vascular risk factors such as **diabetes** and hypertension.*Central retinal artery occlusion* - Presents with **sudden, painless, profound monocular vision loss**. - Fundoscopy classically shows a **cherry-red spot** at the macula and a **pale, edematous retina**, which differs from the described findings.*Central retinal vein occlusion* - Typically causes **painless vision loss**, which can be sudden or gradual. - Fundoscopy characteristically reveals **widespread retinal hemorrhages** (often described as

Question 53: A 27-year-old man is brought to the Emergency Department by his girlfriend who witnessed a seizure. She describes that he suddenly stopped talking mid-sentence, turned his head and eyes forcefully to the right, then his right arm started jerking rhythmically for approximately 45 seconds. He did not lose consciousness and was able to describe his symptoms afterwards. He recalls feeling a tingling sensation spreading up his left arm just before the episode. He has no past medical history. Neurological examination is now normal. What is the most likely site of the seizure focus?

A. Right frontal lobe
B. Left frontal lobe (Correct Answer)
C. Right temporal lobe
D. Left parietal lobe
E. Left occipital lobe

Explanation: ***Left frontal lobe*** - The forced head and eye deviation to the **right** (versive movement) is caused by activation of the **frontal eye fields** in the contralateral (**left**) hemisphere. - Rhythmic jerking of the right arm indicate seizure activity in the **primary motor cortex** located in the **left frontal lobe**, with preserved consciousness defining it as a **focal aware seizure**. *Right frontal lobe* - Seizures in this region would cause **left-sided** motor manifestations and head deviation to the **left**, which contradicts the patient's right-arm jerking. - Motor and versive symptoms in epilepsy typically localize to the **contralateral** side of the brain focus. *Right temporal lobe* - Seizures here usually involve **impaired awareness**, **automatisms** (like lip-smacking), and **epigastric auras**, none of which were described. - Motor features in temporal lobe epilepsy are usually **dystonic posturing** rather than rhythmic clonic jerking or forced eye deviation. *Left parietal lobe* - While the sensory aura (tingling) suggests **somatosensory cortex** involvement, the prominent **versive eye movements** and rhythmic motor jerking are more specific to frontal lobe activation. - Parietal lobe seizures typically present with **paresthesias** or distorted body image rather than primary motor rhythmic jerking and eye deviation. *Left occipital lobe* - Seizures in this focus primarily manifest as **visual phenomena**, such as flashing lights, colors, or temporary **scotomas**. - Although they can spread to the frontal lobe, the lack of visual symptoms at the onset makes a **primary occipital focus** highly unlikely.

Question 54: A 69-year-old man presents to the Emergency Department with acute onset confusion, right homonymous hemianopia, and inability to recognize familiar faces, including his wife. He cannot describe the features of his own home when asked. There is no limb weakness, sensory loss, or language impairment. CT head performed 3 hours after symptom onset shows a subtle hypodensity in the left occipito-temporal region with no haemorrhage. Which anatomical territory is most likely affected by this stroke?

A. Left anterior cerebral artery
B. Left middle cerebral artery
C. Left posterior cerebral artery (Correct Answer)
D. Basilar artery
E. Left anterior choroidal artery

Explanation: ***Left posterior cerebral artery*** - The **posterior cerebral artery (PCA)** supplies the **occipital lobe** and **inferior temporal lobe**; damage here explains the **right homonymous hemianopia** and **prosopagnosia** (inability to recognise faces via the fusiform gyrus). - The patient exhibits **topographical disorientation** and preserved motor/language functions, which are classic signs of a **PCA territory** infarct sparing the motor cortex and Broca's/Wernicke's areas. *Left anterior cerebral artery* - Infarction in the **ACA** territory typically presents with contralateral **lower limb weakness** and sensory loss due to involvement of the medial homunculus. - It may also cause personality changes or **urinary incontinence**, none of which are present in this clinical scenario. *Left middle cerebral artery* - **MCA** strokes usually present with contralateral **hemiparesis** (face and arm worse than leg) and **aphasia** if the dominant hemisphere is involved. - This patient has no **limb weakness** or **language impairment**, making an MCA territory infarct highly unlikely. *Basilar artery* - **Basilar artery** occlusion often leads to severe **brainstem dysfunction**, including cranial nerve palsies, quadriplegia, or decreased levels of consciousness (“locked-in syndrome”). - While it can lead to bilateral PCA symptoms, a focal left-sided hypodensity and lack of brainstem signs point away from a mainstem basilar event. *Left anterior choroidal artery* - Occlusion of this artery typically results in a triad of hemiparesis, hemisensory loss, and **homonymous hemianopia** due to its supply to the **internal capsule** and optic tract. - The absence of **motor and sensory deficits** in this patient excludes the involvement of the internal capsule and thalamic structures supplied by this vessel.

Question 55: A 33-year-old woman attends neurology clinic following a first unprovoked generalised tonic-clonic seizure 6 weeks ago. She has fully recovered with no residual symptoms. She works as a bus driver. Her neurological examination is normal. MRI brain shows no abnormality. EEG shows occasional generalised spike-and-wave discharges. She is keen to return to work as soon as possible. According to UK DVLA regulations, what advice should be given regarding her driving?

A. She can return to driving her bus immediately as she has had only one seizure
B. She must stop driving all vehicles and can return to a car licence after 6 months seizure-free, but can never hold a bus licence again
C. She must stop driving all vehicles and can return to driving a car after 12 months seizure-free, but cannot return to professional driving for 5 years (Correct Answer)
D. She must stop driving all vehicles for 12 months, after which both car and bus licences can be reinstated if seizure-free
E. She can continue driving a car but must inform DVLA and stop driving her bus permanently

Explanation: ***She must stop driving all vehicles and can return to driving a car after 12 months seizure-free, but cannot return to professional driving for 5 years***- For a **Group 1 licence** (cars), the standard off-road period after a first unprovoked generalised tonic-clonic seizure is **12 months** seizure-free.- For a **Group 2 licence** (buses/lorries), the regulations are much stricter, requiring a **5-year seizure-free period** without anti-epileptic medication. *She can return to driving her bus immediately as she has had only one seizure*- This is incorrect and dangerous; a **first unprovoked seizure** necessitates an immediate cessation of driving to ensure public safety.- Driving against medical advice or **DVLA regulations** carries legal penalties and invalidates insurance. *She must stop driving all vehicles and can return to a car licence after 6 months seizure-free, but can never hold a bus licence again*- While a reduction to **6 months** for a **car licence** is possible in very specific low-risk circumstances (e.g., normal EEG/MRI, no risk factors), it is not the standard and must be approved by the DVLA.- A **Group 2 licence** is not permanently revoked after a single event; it can be reconsidered after **5 years** seizure-free off medication. *She must stop driving all vehicles for 12 months, after which both car and bus licences can be reinstated if seizure-free*- This incorrectly applies the **Group 1 (car) timescale** to a **Group 2 (bus) licence**; professional driving involves significantly higher safety standards and longer abstinence periods.- Reinstatement of a **bus licence** requires a much longer period of **5 years** seizure-free, as opposed to the 1 year for a car. *She can continue driving a car but must inform DVLA and stop driving her bus permanently*- After any seizure, individuals must **immediately stop driving all vehicles** (both Group 1 and Group 2) and inform the DVLA.- The ban for **professional driving** is not necessarily permanent after a single unprovoked seizure if the **5-year seizure-free threshold** is met.

Question 56: A 76-year-old man with Alzheimer's dementia (MMSE 15/30) is brought to the memory clinic by his daughter. She reports that over the past 2 months he has developed prominent visual and auditory hallucinations, becoming convinced that people are living in his attic and stealing his belongings. He has become verbally aggressive when she tries to reassure him. He has no previous psychiatric history. He is currently taking donepezil 10 mg daily, amlodipine, and atorvastatin. Which of the following is the most appropriate initial management of his psychotic symptoms?

A. Add risperidone 0.5 mg twice daily
B. Review for underlying causes and optimize donepezil therapy (Correct Answer)
C. Add haloperidol 1 mg twice daily
D. Stop donepezil and commence memantine
E. Add quetiapine 25 mg twice daily

Explanation: ***Review for underlying causes and optimize donepezil therapy*** - Initial management of **Behavioral and Psychological Symptoms of Dementia (BPSD)**, including new-onset psychosis, requires a thorough review for **precipitating factors** such as infections (e.g., UTI), pain, constipation, dehydration, or medication side effects. - Non-pharmacological interventions are always first-line. Optimizing or ensuring adherence to current **cholinesterase inhibitor** therapy like **donepezil** should be explored before considering new psychoactive medications. *Add risperidone 0.5 mg twice daily* - **Risperidone**, an atypical antipsychotic, is associated with a significantly increased risk of **stroke** and **all-cause mortality** in elderly patients with dementia-related psychosis. - It should only be considered for short-term use and at the lowest effective dose if non-pharmacological measures fail and there is a **significant risk of harm** to the patient or others. *Add haloperidol 1 mg twice daily* - **Haloperidol**, a typical antipsychotic, has a high risk of **extrapyramidal side effects** (e.g., parkinsonism, tardive dyskinesia), sedation, and anticholinergic effects, which can worsen cognitive function in dementia. - It is generally not recommended for the management of BPSD due to its severe side effect profile and lack of specific licensing for this indication. *Stop donepezil and commence memantine* - **Abruptly stopping donepezil** can lead to a rapid decline in cognitive function and may exacerbate existing neuropsychiatric symptoms, including psychosis. - While **memantine** can be added for moderate-to-severe Alzheimer's dementia, it is not the initial appropriate step for managing acute psychotic symptoms without investigating underlying causes. *Add quetiapine 25 mg twice daily* - **Quetiapine** is an atypical antipsychotic sometimes used off-label due to a lower risk of extrapyramidal symptoms; however, like other antipsychotics, it carries a **black box warning** for increased mortality in elderly patients with dementia-related psychosis. - While it may be considered in some refractory cases, it should not be the initial management for new-onset psychosis without first identifying and addressing reversible causes.

Question 57: A 51-year-old woman with a 15-year history of relapsing-remitting multiple sclerosis presents to clinic. She has experienced increasing disability over the past 18 months with progressive worsening of mobility, spasticity, and bladder symptoms, without distinct relapses. Her current EDSS score is 6.5 (requires bilateral support to walk 20 metres). She is currently on dimethyl fumarate. MRI brain shows multiple T2 hyperintense periventricular lesions, unchanged from 12 months ago, with no new gadolinium-enhancing lesions. What does this clinical picture most likely represent?

A. Relapsing-remitting multiple sclerosis with pseudo-progression
B. Secondary progressive multiple sclerosis (Correct Answer)
C. Primary progressive multiple sclerosis
D. Relapsing-remitting multiple sclerosis with frequent relapses
E. Tumefactive multiple sclerosis

Explanation: ***Secondary progressive multiple sclerosis***- This diagnosis is characterized by a **gradual neurological deterioration** that occurs independent of relapses following an initial **relapsing-remitting course (RRMS)**.- The patient's 18-month history of worsening mobility, spasticity, bladder symptoms, and a high **EDSS score** (6.5) despite stable MRI findings (no gadolinium enhancement) are classic indicators of this transition.*Relapsing-remitting multiple sclerosis with pseudo-progression*- **Pseudo-progression** involves a temporary worsening of symptoms due to external triggers like **infection** or **heat (Uthoff's phenomenon)**, not a sustained 18-month decline.- It does not represent permanent **neurological disability** or a change in the underlying disease phenotype.*Primary progressive multiple sclerosis*- **PPMS** is defined by progressive disability from the **clinical onset** of the disease without any prior relapses or remissions.- This patient has a 15-year history of **RRMS**, which explicitly excludes a diagnosis of primary progressive disease.*Relapsing-remitting multiple sclerosis with frequent relapses*- This clinical picture describes active inflammation marked by **acute attacks** and the development of **new gadolinium-enhancing lesions** on MRI.- The case states there have been **no distinct relapses** and the MRI shows **unchanged periventricular lesions**, contradicting this option.*Tumefactive multiple sclerosis*- This rare variant presents with large, **tumor-like demyelinating lesions** (greater than 2cm) that often cause mass effect or edema.- The MRI in this patient showed **multiple periventricular lesions** typical of standard MS, not the large solitary lesions seen in **tumefactive MS**.

Question 58: A 44-year-old man presents to his GP with a 6-week history of headaches. He describes them as bilateral, pressing/tightening in quality, of mild to moderate intensity, occurring daily. The headaches are present on waking and persist throughout the day. They are not aggravated by routine physical activity and are not associated with nausea, photophobia, or phonophobia. He denies any visual disturbances. Over the past 3 months, he has also noticed reduced libido and has gained 8 kg in weight despite no change in diet. On examination, visual acuity is 6/6 bilaterally. Fundoscopy reveals bilateral papilloedema. What is the most appropriate next investigation?

A. MRI brain with pituitary protocol (Correct Answer)
B. CT head with contrast
C. Lumbar puncture to measure opening pressure
D. Visual field testing by perimetry
E. 24-hour urinary free cortisol

Explanation: ***MRI brain with pituitary protocol***- The patient presents with **papilloedema**, indicating **raised intracranial pressure**, combined with **endocrine dysfunction** (reduced libido, weight gain). This constellation of symptoms strongly points to a **pituitary or sellar mass lesion**.- **MRI with pituitary protocol** is the **gold standard** for high-resolution imaging of the **sella turcica** and surrounding structures, essential for diagnosing pituitary adenomas or other space-occupying lesions in this region.*CT head with contrast*- **CT scans** are significantly **less sensitive** than MRI for detailed evaluation of the **pituitary gland** and detecting small or subtle soft-tissue lesions.- While useful for acute neurological emergencies or identifying large masses, it is **suboptimal** for a dedicated pituitary assessment.*Lumbar puncture to measure opening pressure*- Performing a **lumbar puncture** is **contraindicated** as an initial investigation in a patient with **papilloedema** due to the significant risk of **brain herniation (coning)**.- Neuroimaging must always precede a lumbar puncture in cases of suspected **raised intracranial pressure** to rule out a space-occupying lesion.*Visual field testing by perimetry*- While **visual field testing** is an important part of the neurological workup for pituitary lesions (to detect **bitemporal hemianopia**), it is a **functional assessment**.- It does not identify the underlying structural cause of the symptoms, and **urgent imaging** is required to diagnose the lesion causing raised ICP and endocrine dysfunction.*24-hour urinary free cortisol*- This investigation is used to diagnose **Cushing's syndrome**, which can cause weight gain but typically does not present with **papilloedema** as a direct primary symptom.- The immediate priority is to identify the **structural lesion** responsible for both the signs of **raised intracranial pressure** and the endocrine disturbance.

Question 59: An 81-year-old man is admitted to hospital for investigation of recurrent falls. On the second day of admission, nursing staff report that he has become acutely confused overnight, believing he is in his childhood home and that deceased relatives are visiting him. He is agitated and trying to leave the ward. He has a history of hypertension and underwent a right total hip replacement 3 days ago. His current medications include amlodipine, paracetamol, and oxycodone for post-operative pain. Observations show temperature 37.8°C, blood pressure 142/86 mmHg, heart rate 94 bpm, respiratory rate 18/min, and oxygen saturation 94% on room air. What is the most appropriate first-line pharmacological intervention for his acute agitation?

A. Haloperidol 0.5 mg orally (Correct Answer)
B. Lorazepam 1 mg orally
C. Diazepam 5 mg orally
D. Quetiapine 25 mg orally
E. Risperidone 1 mg orally

Explanation: ***Haloperidol 0.5 mg orally***- This patient presents with features highly suggestive of **delirium**, characterized by acute onset of fluctuating attention, disorientation, and hallucinations, often triggered by surgery and opioid use in an elderly patient.- **Haloperidol** is the first-line pharmacological treatment for severe agitation in delirium when non-pharmacological measures are insufficient, with **0.5 mg** being an appropriate low starting dose for elderly individuals to minimize side effects.*Lorazepam 1 mg orally*- **Benzodiazepines** like lorazepam are generally **contraindicated** in delirium as they can worsen cognitive impairment, increase confusion, and precipitate paradoxical agitation in the elderly.- Their use is typically restricted to delirium caused by **alcohol withdrawal** or in cases where antipsychotics are absolutely contraindicated (e.g., severe Parkinson's disease).*Diazepam 5 mg orally*- **Diazepam** has a very **long half-life** and produces active metabolites, leading to prolonged sedation, increased risk of **falls**, and respiratory depression, particularly in elderly patients.- Similar to other benzodiazepines, it is not recommended for the routine management of **acute delirium** as it can exacerbate the underlying cognitive dysfunction.*Quetiapine 25 mg orally*- While **quetiapine** is an atypical antipsychotic that can be used in delirium, it is often considered a second-line agent or for specific situations where extrapyramidal symptoms are a major concern, and **haloperidol** is generally preferred for acute agitation.- The starting dose of **25 mg** might be relatively high for an acutely agitated elderly patient, and its sedative profile may not be ideal for clear delirium management.*Risperidone 1 mg orally*- **Risperidone** is an atypical antipsychotic, but a starting dose of **1 mg** is often considered too high for an 81-year-old patient with delirium, increasing the risk of **extrapyramidal side effects** and cerebrovascular events.- Low-dose **haloperidol** is generally preferred for its more predictable efficacy in acute agitation and the ability to start at extremely low doses to minimize adverse effects in the elderly.

Question 60: A 58-year-old woman presents to neurology clinic with a 3-month history of medication-overuse headache. She has been using a combination of paracetamol, ibuprofen, and codeine daily for chronic tension-type headache over the past 2 years. She takes analgesics on at least 20 days per month. Which of the following is the most important principle in managing medication-overuse headache?

A. Gradual reduction of analgesics over 3-6 months
B. Complete and abrupt withdrawal of all overused medications (Correct Answer)
C. Switching to stronger opioid analgesics
D. Adding a prophylactic agent while continuing current analgesics
E. Reducing analgesic frequency to 10 days per month

Explanation: ***Complete and abrupt withdrawal of all overused medications*** - The most critical step in managing **medication-overuse headache (MOH)** is the **complete and abrupt cessation** of the overused analgesic medications to break the cycle of headache frequency and drug sensitivity. - **Abrupt withdrawal** for simple analgesics, NSAIDs, and triptans is generally more effective than gradual tapering in achieving long-term resolution and is the recommended first-line approach. *Gradual reduction of analgesics over 3-6 months* - This approach is generally **less effective** for MOH caused by simple analgesics and NSAIDs, as it can prolong the withdrawal phase and increase the risk of relapse. - While gradual tapering may be considered for **opioids** or **barbiturates** to mitigate severe withdrawal symptoms, it is not the primary principle for the combination of drugs mentioned. *Switching to stronger opioid analgesics* - This approach is **contraindicated** as it would exacerbate the underlying problem of medication overuse, leading to increased dependency and worsening of the headache cycle. - The management principle is to **reduce or eliminate** analgesic use, not to escalate to more potent and potentially addictive substances. *Adding a prophylactic agent while continuing current analgesics* - Prophylactic agents are typically introduced **after** the withdrawal phase, as their efficacy is significantly diminished or negated while the patient continues to overuse analgesics. - The primary goal is to **break the MOH cycle** before effectively treating the underlying primary headache disorder with prophylactic medication. *Reducing analgesic frequency to 10 days per month* - While reducing frequency is a goal for preventing MOH, for an established case, **complete cessation** is the initial and most important step to break the medication overuse cycle. - Merely reducing frequency may not be sufficient to resolve the MOH and could perpetuate the issue, especially with a history of use on at least 20 days per month.

Question 61: A 29-year-old woman who is 14 weeks pregnant presents to the antenatal clinic. She has a 10-year history of generalised tonic-clonic seizures, well-controlled on sodium valproate 1000 mg twice daily. She has been seizure-free for 5 years. The pregnancy was unplanned and she has been taking folic acid 5 mg daily since finding out she was pregnant 6 weeks ago. She is very anxious about the risks to her baby. What is the most appropriate advice regarding her antiepileptic medication?

A. Continue sodium valproate as benefits of seizure control outweigh risks at this stage (Correct Answer)
B. Immediately switch to lamotrigine
C. Immediately switch to levetiracetam
D. Gradually withdraw all antiepileptic medication
E. Reduce sodium valproate dose by half

Explanation: ***Continue sodium valproate as benefits of seizure control outweigh risks at this stage*** - By **14 weeks gestation**, the critical period for **organogenesis** and the primary risk for **neural tube defects** (typically 3-4 weeks post-conception) associated with valproate has largely passed, meaning a switch now will not undo previous exposure. - Maintaining **seizure freedom** is paramount during pregnancy; switching medication now carries a significant risk of **seizure recurrence**, which could lead to maternal trauma, falls, and potentially dangerous **fetal hypoxia**. *Immediately switch to lamotrigine* - An immediate switch to **lamotrigine** would involve a titration period during which the patient could be at risk of **breakthrough seizures**, jeopardizing both maternal and fetal well-being. - While lamotrigine has a generally lower teratogenic risk, the most vulnerable period for valproate-related malformations has passed, making seizure stability the priority. *Immediately switch to levetiracetam* - Switching abruptly to **levetiracetam** could destabilize a previously well-controlled epilepsy, leading to a risk of **seizures** during pregnancy when maintaining stability is crucial. - The primary **teratogenic risk** of sodium valproate occurs in the first trimester, so changing medication at 14 weeks offers little benefit in preventing those specific malformations and introduces new risks. *Gradually withdraw all antiepileptic medication* - **Withdrawing all antiepileptic medication** in a patient with a history of generalized tonic-clonic seizures carries an unacceptably high risk of **severe, uncontrolled seizures** or even **status epilepticus**. - Uncontrolled seizures during pregnancy pose significant dangers to the fetus, including **hypoxia**, **acidosis**, and **trauma**, far outweighing any potential benefit of medication cessation at this stage. *Reduce sodium valproate dose by half* - Arbitrarily reducing the **sodium valproate dose by half** is likely to lead to **subtherapeutic levels** and increase the risk of **breakthrough seizures**, which are dangerous for both mother and fetus. - The goal in pregnancy is to maintain the **lowest effective dose** that ensures seizure control; making a significant reduction without careful titration and monitoring is inappropriate and potentially harmful.

Question 62: A 72-year-old man with Parkinson's disease presents with a 4-month history of progressive cognitive decline. His wife reports he has become increasingly forgetful and has experienced recurrent, detailed visual hallucinations of children playing in their living room. His symptoms fluctuate throughout the day, with periods of lucidity alternating with confusion. He has had several falls. His Parkinson's medication includes co-careldopa. On examination, he has bradykinesia, rigidity, and a shuffling gait. His MMSE is 20/30. What is the most likely underlying diagnosis?

A. Alzheimer's dementia
B. Vascular dementia
C. Dementia with Lewy bodies (Correct Answer)
D. Parkinson's disease dementia
E. Normal pressure hydrocephalus

Explanation: ***Dementia with Lewy bodies*** - This diagnosis is characterized by the triad of **fluctuating cognition**, recurrent **detailed visual hallucinations**, and spontaneous **parkinsonism**. - The **one-year rule** applies here; if cognitive decline occurs prior to or within one year of the onset of motor symptoms, it is classified as DLB rather than Parkinson's disease dementia. *Alzheimer's dementia* - Primarily presents with early and progressive **episodic memory loss**, rather than early visual hallucinations or motor symptoms. - Lacks the **fluctuating levels of consciousness** and attention typically seen in Lewy body pathology. *Vascular dementia* - Typically follows a **stepwise decline** associated with focal neurological deficits or a history of strokes/vascular risk factors. - While it can cause executive dysfunction, it does not typically feature **recurrent complex hallucinations** as a primary early symptom. *Parkinson's disease dementia* - In this condition, **motor symptoms** must be well-established for at least **one year** (usually much longer) before the onset of cognitive impairment. - Though biologically similar to DLB, the **chronological sequence** of symptoms in this patient suggests DLB over PDD. *Normal pressure hydrocephalus* - Characterized by the classic triad of **magnetic gait** (shuffling), **urinary incontinence**, and cognitive impairment. - It does not typically present with **complex visual hallucinations** or the specific fluctuating alertness seen in this case.

Question 63: A 36-year-old woman presents to the Emergency Department with a 6-hour history of sudden onset severe occipital headache, photophobia, and neck stiffness. She describes the headache as the worst she has ever experienced, reaching maximum intensity within seconds. Her temperature is 37.2°C, blood pressure 145/88 mmHg, and Glasgow Coma Scale 15/15. Neurological examination shows mild neck stiffness but no focal neurological deficit. A non-contrast CT head performed 8 hours after symptom onset shows no acute abnormality. What is the most appropriate next investigation?

A. Discharge with analgesia and reassurance
B. CT angiography of cerebral vessels
C. Lumbar puncture (Correct Answer)
D. MRI brain with gadolinium
E. Repeat CT head in 24 hours

Explanation: ***Lumbar puncture*** - A **thunderclap headache** (worst headache of life, sudden onset) with neck stiffness is highly suspicious for **subarachnoid haemorrhage (SAH)**; if the initial non-contrast **CT head** is negative, especially within 6-12 hours of symptom onset, a lumbar puncture is mandatory to confirm or exclude the diagnosis.- The procedure looks for **xanthochromia** (yellow discoloration of CSF due to bilirubin from red blood cell breakdown) and is most reliable when performed at least **12 hours** after the onset of symptoms, allowing time for red cell lysis. *Discharge with analgesia and reassurance*- This is inappropriate and dangerous because a negative **CT head** performed 8 hours after symptom onset does not reliably exclude a **subarachnoid haemorrhage** in a patient with classic symptoms.- Missing this diagnosis carries a high risk of **re-bleeding** and significant mortality or long-term neurological morbidity. *CT angiography of cerebral vessels*- While useful for identifying the source of bleeding (e.g., a **cerebral aneurysm**), it is not the next diagnostic step when the presence of blood has not yet been confirmed by **CT head** or **lumbar puncture**.- **CTA** can show incidental aneurysms that may not be the cause of the current headache, potentially leading to unnecessary further investigations or interventions. *MRI brain with gadolinium*- **MRI** is generally **less sensitive** than **CT** in the acute phase (first 24 hours) for detecting fresh blood in the subarachnoid space.- It is not the standard of care for the emergency work-up of a suspected **acute SAH** following a negative CT scan, where **lumbar puncture** is the definitive secondary test. *Repeat CT head in 24 hours*- The sensitivity of a **non-contrast CT** for SAH actually **decreases** over time as the blood is washed away or degraded by cerebrospinal fluid.- Waiting to repeat the same imaging modality would delay a critical diagnosis and fail to utilize the gold-standard secondary test, which is **cerebrospinal fluid (CSF) analysis** for xanthochromia.

Question 64: A 41-year-old woman presents to her GP with a 3-year history of recurrent episodes characterised by a brief warning sensation in her epigastrium, followed by loss of awareness lasting 30-60 seconds. During these episodes, witnesses report that she stares blankly, makes repetitive chewing movements, and fumbles with her clothing. She is amnesic for the events. She has tried lamotrigine with partial benefit but continues to have 2-3 episodes per month. Which of the following is the most appropriate next step in her antiepileptic drug management?

A. Add carbamazepine
B. Add levetiracetam (Correct Answer)
C. Switch to sodium valproate
D. Add phenytoin
E. Switch to carbamazepine

Explanation: ***Add levetiracetam*** - This patient presents with **focal seizures with impaired awareness**, suggested by the epigastric aura, loss of awareness, and automatisms (chewing, fumbling). Given **lamotrigine** offers partial benefit, adding a second-line antiepileptic drug is the next appropriate step. - **Levetiracetam** is a suitable choice for adjunctive therapy in focal epilepsy, particularly in women of childbearing age due to its **favorable safety profile** and minimal **drug-drug interactions**. *Add carbamazepine* - While effective for focal seizures, **carbamazepine** is a potent **enzyme inducer** and carries a significant risk of **drug-drug interactions**, which can complicate polytherapy. - It can also cause notable side effects like **dizziness** and **ataxia**, and may not be the optimal adjunctive choice when other safer alternatives exist. *Switch to sodium valproate* - **Sodium valproate** has a high **teratogenic risk** and is generally avoided in women of childbearing potential unless absolutely necessary and other options are exhausted. - Since lamotrigine provides partial benefit and is tolerated, switching is less appropriate than adding an adjunctive therapy. *Add phenytoin* - **Phenytoin** is characterized by **zero-order kinetics** and a **narrow therapeutic window**, making its dosing and monitoring challenging and increasing toxicity risk. - Long-term use is associated with significant side effects, including **gingival hyperplasia**, **hirsutism**, and **osteomalacia**, making it a less preferred add-on option. *Switch to carbamazepine* - Switching from an antiepileptic drug that offers partial benefit is generally not the first approach; **adjunctive therapy** is typically preferred to optimize seizure control. - Similar to adding it, switching to **carbamazepine** introduces concerns regarding **enzyme induction** and potential **drug interactions** with existing medications.

Question 65: A 63-year-old woman with hypertension and type 2 diabetes presents to the Emergency Department with sudden onset right-sided weakness and dysarthria that started 90 minutes ago. CT head shows no haemorrhage. Her NIHSS score is 14. CT angiography demonstrates a left middle cerebral artery (MCA) occlusion. She has no contraindications to thrombolysis or thrombectomy. Which of the following is the most appropriate initial management?

A. Mechanical thrombectomy alone
B. Intravenous alteplase alone
C. Intravenous alteplase followed by mechanical thrombectomy (Correct Answer)
D. Aspirin 300 mg immediately
E. Dual antiplatelet therapy with aspirin and clopidogrel

Explanation: ***Intravenous alteplase followed by mechanical thrombectomy*** - For patients presenting within **4.5 hours** of symptom onset with a **large vessel occlusion (LVO)**, such as the left MCA, a "bridging therapy" approach is the standard of care.- **IV alteplase** is administered immediately to potentially dissolve the clot while preparations for **mechanical thrombectomy** occur, as the combination provides the highest likelihood of functional recovery.*Mechanical thrombectomy alone* - This approach is generally reserved for patients who have absolute **contraindications to thrombolysis** (e.g., recent surgery or bleeding disorders), which this patient does not have.- Current guidelines favor initiating **IV thrombolysis** first because it may achieve early recanalization or soften the clot before the endovascular procedure.*Intravenous alteplase alone* - While effective for smaller vessels, stroke caused by LVO has a low **recanalization rate** (often <15-30%) with **IV alteplase** alone.- Patients with high **NIHSS scores** and confirmed LVO significantly benefit from adding **mechanical thrombectomy** to achieve better reperfusion results.*Aspirin 300 mg immediately* - **Aspirin** is recommended for secondary prevention but must be delayed for **24 hours** after the administration of **IV thrombolysis** to minimize the risk of hemorrhagic transformation.- It is not a substitute for reperfusion therapies in the hyperacute phase of an **ischemic stroke** with a major deficit.*Dual antiplatelet therapy with aspirin and clopidogrel* - **Dual antiplatelet therapy (DAPT)** is used for minor strokes or high-risk TIAs, but not in the presence of a **large vessel occlusion** requiring emergency reperfusion.- Similar to aspirin monotherapy, **DAPT** is contraindicated within the first 24 hours of receiving **IV alteplase** due to the significant risk of intracranial bleeding.

Question 66: A 67-year-old man presents to the Emergency Department with sudden onset weakness of the left arm and leg that began 2 hours ago. He has a history of hypertension and hyperlipidaemia. On examination, his blood pressure is 168/95 mmHg, heart rate 78 bpm regular, and oxygen saturation 96% on room air. Neurological examination reveals left hemiparesis with increased tone and brisk reflexes. A non-contrast CT head shows no haemorrhage or early ischaemic changes. Which of the following is the maximum time window from symptom onset for administering intravenous thrombolysis in eligible patients with acute ischaemic stroke?

A. 3 hours
B. 4.5 hours (Correct Answer)
C. 6 hours
D. 9 hours
E. 12 hours

Explanation: ***4.5 hours*** - Current clinical guidelines, based on the **ECASS III trial**, state that **intravenous alteplase (rtPA)** can be administered up to **4.5 hours** from the onset of stroke symptoms. - While treatment is most effective within the first 3 hours, extending the window to **4.5 hours** provides significant benefit for recovery, provided there are no **contraindications** such as intracranial hemorrhage. *3 hours* - This was the original **FDA-approved** time window based on the **NINDS trial**; however, it has since been expanded to include eligible patients up to 4.5 hours. - Restricting treatment to only 3 hours would unnecessarily exclude patients who still derive benefit from **thrombolytic therapy**. *6 hours* - The **6-hour window** is more commonly associated with the timeframe for **mechanical thrombectomy** in patients with a **Large Vessel Occlusion (LVO)**. - For intravenous thrombolysis, the risk of **hemorrhagic transformation** increases significantly beyond the 4.5-hour mark, making it unsuitable as a routine maximum window. *9 hours* - While some advanced imaging-guided protocols (using **CT perfusion**) are investigating extended windows for rtPA, it is not the standard maximum window for general practice. - Administration at this stage without specific **penumbral imaging** criteria is associated with a high risk of **intracranial bleeding**. *12 hours* - This time frame far exceeds the safety profile for **intravenous thrombolysis** and is not supported by standard clinical evidence for rtPA. - In selected patients with large vessel strokes, **mechanical thrombectomy** may be considered up to **24 hours**, but clinical outcomes for IV thrombolysis at this stage are poor.

Question 67: A 54-year-old woman presents to the Emergency Department with sudden onset of the worst headache of her life, which peaked within 1 minute. She vomited twice and has photophobia. She has a history of polycystic kidney disease. On examination, she is alert and oriented, temperature 37.2°C, BP 165/95 mmHg, pulse 88/min. There is mild neck stiffness but no focal neurological deficit. CT head performed 4 hours after onset shows no abnormality. What is the most appropriate next step?

A. Discharge with analgesia and neurology follow-up
B. Perform lumbar puncture to analyze CSF for xanthochromia and red cells (Correct Answer)
C. Arrange CT angiography of cerebral vessels
D. Repeat CT head in 6 hours
E. Start prophylactic nimodipine 60 mg four times daily

Explanation: ***Perform lumbar puncture to analyze CSF for xanthochromia and red cells*** - A **thunderclap headache** in a patient with **polycystic kidney disease** (associated with berry aneurysms) is highly suspicious for **subarachnoid hemorrhage (SAH)**, even if the initial CT is negative. - When a non-contrast CT head is negative or inconclusive, especially if performed early, a **lumbar puncture** performed at least **12 hours after symptom onset** is the gold standard to look for **xanthochromia** and **red blood cells**. *Discharge with analgesia and neurology follow-up* - Discharging the patient is unsafe because a **normal CT scan** does not 100% exclude SAH, particularly if performed within 6 hours of symptom onset, or if there's a small bleed. - Missing a diagnosis of SAH carries a high risk of subsequent catastrophic **rebleeding** and potentially fatal outcomes. *Arrange CT angiography of cerebral vessels* - **CT angiography (CTA)** is used to identify the source of bleeding (e.g., an **aneurysm**) *after* the diagnosis of SAH has been confirmed by CT or CSF analysis. - It is not the primary diagnostic tool for confirming the presence of **subarachnoid blood** itself if the non-contrast CT is negative and SAH is still suspected. *Repeat CT head in 6 hours* - Repeating a non-contrast CT head is not the next most appropriate step, as the sensitivity for detecting blood **decreases over time**; if the initial CT was negative, a subsequent CT is unlikely to reveal blood unless there's a new bleed. - If clinical suspicion for SAH remains high despite a negative initial CT, **lumbar puncture** is the definitive next diagnostic step. *Start prophylactic nimodipine 60 mg four times daily* - **Nimodipine** is a calcium channel blocker used to prevent **delayed cerebral ischemia** caused by vasospasm, which is a common complication *after* a confirmed SAH. - This is a management step for established SAH and should only be initiated once the **diagnosis of SAH** is definitively established by imaging or CSF analysis.

Question 68: A 66-year-old man presents with a 9-month history of progressive memory impairment and behavioral changes. His wife reports he has become disinhibited, making inappropriate comments in public, and has developed a sweet tooth with food preferences he never had before. He has lost interest in his hobbies but shows no concern about his symptoms. On examination, he has mild frontal release signs. MMSE score is 22/30 with particular difficulty in verbal fluency. MRI brain shows bilateral frontal and anterior temporal lobe atrophy. What is the most likely diagnosis?

A. Alzheimer's dementia
B. Behavioral variant frontotemporal dementia (Correct Answer)
C. Vascular dementia
D. Dementia with Lewy bodies
E. Normal pressure hydrocephalus

Explanation: ***Behavioral variant frontotemporal dementia*** - This diagnosis is characterized by early **behavioral changes** such as **disinhibition**, **apathy**, and **hyperorality** (e.g., developing a sweet tooth and new food preferences), along with **frontal and anterior temporal lobe atrophy** on MRI. - Key features include **loss of insight** regarding symptoms, executive dysfunction (difficulty in verbal fluency), and frontal release signs, which are all present in the patient. *Alzheimer's dementia* - Primarily presents with early and prominent **episodic memory loss** and visuospatial deficits, rather than initial behavioral changes or disinhibition. - Neuroimaging typically shows **hippocampal atrophy** and temporoparietal involvement, rather than the specific frontal and anterior temporal atrophy seen here. *Vascular dementia* - Characterized by a **stepwise decline** in cognitive function, often associated with focal neurological deficits and clear **vascular risk factors** or a history of stroke. - **MRI** would typically reveal multiple infarcts or significant **white matter disease**, which is not the primary finding in this case. *Dementia with Lewy bodies* - Presents with a classic triad of **fluctuating cognition**, recurrent **visual hallucinations**, and features of **parkinsonism**. - While behavioral symptoms can occur, the prominent early disinhibition and hyperorality without other defining features make this less likely. *Normal pressure hydrocephalus* - Clinically defined by the triad of **gait disturbance** (often described as magnetic), **urinary incontinence**, and cognitive decline (typically attention and executive function). - Imaging characteristically shows **ventriculomegaly** out of proportion to sulcal atrophy, which is distinct from the focal cortical atrophy observed in this patient.

Question 69: A 48-year-old woman with a 15-year history of migraine with aura presents with increasingly frequent attacks despite taking propranolol 80 mg twice daily and using sumatriptan for acute attacks. She has 12 migraine days per month with significant disability. She has tried and failed topiramate due to side effects. Her BMI is 28 kg/m². Blood pressure is 118/76 mmHg. What is the most appropriate next step in management?

A. Switch propranolol to amitriptyline 75 mg at night
B. Add greater occipital nerve block injections
C. Refer for consideration of CGRP monoclonal antibody therapy (Correct Answer)
D. Commence sodium valproate 600 mg twice daily
E. Increase propranolol to 120 mg twice daily

Explanation: ***Refer for consideration of CGRP monoclonal antibody therapy*** - This patient has **chronic migraine** (12 migraine days per month) and has failed two adequate trials of preventive medications (**propranolol** and **topiramate**). - This failure to respond to conventional oral preventatives is a key criterion for initiating **CGRP monoclonal antibody** therapy, which targets specific pathways involved in migraine. *Switch propranolol to amitriptyline 75 mg at night* - While **amitriptyline** is a valid preventive, the patient has already failed two first-line preventatives, making advanced therapies like CGRP inhibitors more appropriate at this stage. - **75 mg** is a high starting dose, often associated with significant **sedation** and **anticholinergic side effects**, which could worsen patient compliance and quality of life. *Add greater occipital nerve block injections* - **Greater occipital nerve blocks** are typically used for acute migraine attacks, **cluster headaches**, or as a bridge therapy, rather than a long-term preventive for chronic migraine. - They offer temporary relief and do not address the systemic **pathophysiology** of frequent, disabling migraine attacks effectively. *Commence sodium valproate 600 mg twice daily* - **Sodium valproate** carries a significant **teratogenic risk** and is generally contraindicated in women of **childbearing potential** unless strict pregnancy prevention measures are in place. - It also has other side effects like **weight gain** and hair loss, making it less favorable than CGRP inhibitors for a patient who has failed other preventatives. *Increase propranolol to 120 mg twice daily* - The patient is already on **160 mg daily** of propranolol (80 mg BID) and is still experiencing 12 migraine days per month, indicating suboptimal efficacy. - Increasing the dose further is unlikely to provide significant additional benefit and would heighten the risk of **dose-dependent side effects** such as **bradycardia** and **fatigue**.

Question 70: What is the mechanism of action of memantine in the treatment of Alzheimer's dementia?

A. Reversible inhibition of acetylcholinesterase
B. Irreversible inhibition of acetylcholinesterase
C. NMDA receptor antagonist reducing glutamate excitotoxicity (Correct Answer)
D. Selective serotonin reuptake inhibitor
E. Dopamine receptor agonist

Explanation: ***NMDA receptor antagonist reducing glutamate excitotoxicity***- Memantine is a **non-competitive, low-affinity NMDA receptor antagonist** that modulates glutamatergic neurotransmission.- This action helps to prevent excessive neuronal stimulation and **excitotoxicity** caused by overactive glutamate signaling, a significant factor in the progression of Alzheimer's disease.*Reversible inhibition of acetylcholinesterase*- This mechanism describes the action of drugs like **donepezil**, **rivastigmine**, and **galantamine**, which are also used in Alzheimer's treatment.- These drugs increase the availability of **acetylcholine** in the synaptic cleft, targeting the cholinergic deficit in the disease.*Irreversible inhibition of acetylcholinesterase*- This mechanism is associated with toxic agents such as **organophosphates** and is not a therapeutic approach for Alzheimer's dementia.- Irreversible inhibition would lead to a severe and sustained **cholinergic crisis**, which is life-threatening.*Selective serotonin reuptake inhibitor*- **SSRIs** are primarily used to treat mood disorders like **depression and anxiety** by increasing serotonin levels in the brain.- While these conditions can co-occur with Alzheimer's, SSRIs do not address the core **neurodegenerative pathology** of the disease.*Dopamine receptor agonist*- **Dopamine receptor agonists** are typically used in the management of **Parkinson's disease** and restless leg syndrome.- Their mechanism involves enhancing dopaminergic activity and is not directly relevant to the **cholinergic or glutamatergic imbalances** characteristic of Alzheimer's.

Question 71: A 28-year-old man is brought to the Emergency Department following a witnessed tonic-clonic seizure. He is now post-ictal but becoming more alert. He has no past medical history and takes no medications. Examination shows he is afebrile with Glasgow Coma Scale 14/15. Blood glucose is 5.8 mmol/L, sodium 138 mmol/L, calcium 2.4 mmol/L. He last consumed alcohol 36 hours ago after a heavy weekend of drinking. What is the most appropriate immediate management?

A. Discharge with neurology follow-up and advise not to drive
B. Administer intravenous lorazepam 4 mg
C. Start oral levetiracetam 500 mg twice daily
D. Admit for chlordiazepoxide regimen and thiamine supplementation (Correct Answer)
E. Arrange urgent CT head and EEG before discharge

Explanation: ***Admit for chlordiazepoxide regimen and thiamine supplementation*** - This patient is experiencing an **alcohol withdrawal seizure**, which typically occurs **12-48 hours** after the last drink following a period of heavy consumption. - Immediate management requires a **benzodiazepine regimen** (e.g., chlordiazepoxide) to prevent further seizures or **delirium tremens**, and **thiamine** to prevent **Wernicke's encephalopathy**. *Discharge with neurology follow-up and advise not to drive* - Discharging this patient prematurely is dangerous because he is at high risk for **recurrent seizures** or progression to **delirium tremens** within the withdrawal window. - While **DVLA advice** regarding driving cessation is necessary eventually, it is not the immediate priority for an unstable patient in withdrawal. *Administer intravenous lorazepam 4 mg* - **Intravenous lorazepam** is the first-line treatment for **active seizures** or **status epilepticus**. - Since the patient is currently **post-ictal** and not actively seizing, prophylactic oral benzodiazepines are more appropriate than emergency IV boluses. *Start oral levetiracetam 500 mg twice daily* - Long-term **anti-epileptic drugs (AEDs)** like levetiracetam are not indicated for **provoked seizures** like those caused by alcohol withdrawal. - The management focus must be on treating the **underlying withdrawal state** rather than a primary seizure disorder like epilepsy. *Arrange urgent CT head and EEG before discharge* - An **EEG** is generally not useful in the emergency setting for a clear **provoked seizure** and does not change immediate management. - A **CT head** is only indicated if there is a history of trauma, **focal neurological deficits**, or if it is a first-ever non-provoked seizure, which is not the case here.

Question 72: A 39-year-old woman presents with a 6-week history of progressive confusion, behavioral changes, and myoclonic jerks. MRI brain shows bilateral symmetrical signal changes in the basal ganglia and cortical ribboning on diffusion-weighted imaging. EEG shows generalized periodic complexes. CSF shows elevated protein at 0.8 g/L with normal glucose and cell count. CSF 14-3-3 protein is positive. What is the most likely diagnosis?

A. Anti-NMDA receptor encephalitis
B. Sporadic Creutzfeldt-Jakob disease (Correct Answer)
C. Progressive multifocal leukoencephalopathy
D. Hashimoto's encephalopathy
E. Variant Creutzfeldt-Jakob disease

Explanation: ***Sporadic Creutzfeldt-Jakob disease*** - This diagnosis is strongly supported by the **rapidly progressive confusion** and **behavioral changes** coupled with **myoclonic jerks** over a 6-week period. - Key diagnostic features include **bilateral symmetrical signal changes in the basal ganglia** and **cortical ribboning on diffusion-weighted imaging (DWI)** on MRI, **generalized periodic complexes** on EEG, and a **positive CSF 14-3-3 protein** test. *Anti-NMDA receptor encephalitis* - This condition typically presents with a more varied clinical picture including **prominent psychiatric symptoms**, seizures, dyskinesias, and autonomic instability, but usually lacks the characteristic MRI findings of **cortical ribboning** and **basal ganglia changes** seen here. - The definitive diagnosis requires the detection of **anti-NMDA receptor antibodies**, and the EEG findings are usually not generalized periodic complexes. *Progressive multifocal leukoencephalopathy* - Caused by the **JC virus**, this disease primarily affects **immunocompromised individuals** and presents with focal neurological deficits related to **demyelination in the white matter**. - MRI typically shows **asymmetrical white matter lesions** without cortical ribboning or basal ganglia involvement, and it does not feature the specific EEG periodic complexes or positive CSF 14-3-3 protein. *Hashimoto's encephalopathy* - While it can cause confusion and myoclonus, it is a **steroid-responsive** encephalopathy often associated with high titers of **anti-thyroid antibodies (e.g., anti-TPO)**, which are not mentioned. - It lacks the specific MRI findings of **cortical ribboning** and **basal ganglia hyperintensity** on DWI, the characteristic EEG periodic complexes, and the **positive CSF 14-3-3 protein** seen in this patient. *Variant Creutzfeldt-Jakob disease* - This form of prion disease typically affects **much younger patients** (often under 30) and presents with early and prominent **psychiatric symptoms** and sensory disturbances, before the onset of frank dementia. - MRI in vCJD classically shows the **"pulvinar sign"** (hyperintensity in the posterior thalamus) rather than the bilateral basal ganglia changes and cortical ribboning on DWI found in sporadic CJD.

Question 73: A 74-year-old woman is admitted with acute left hemiparesis. CT head shows a right middle cerebral artery territory infarct with no haemorrhage. She has atrial fibrillation and her CHA2DS2-VASc score is 5. She is not anticoagulated. After initial management, when is the most appropriate time to commence anticoagulation?

A. Immediately, as the stroke is cardioembolic
B. After 24 hours if repeat CT shows no haemorrhagic transformation
C. After 48 hours regardless of repeat imaging
D. After 14 days following repeat CT to exclude haemorrhagic transformation (Correct Answer)
E. Anticoagulation is contraindicated following ischaemic stroke

Explanation: ***After 14 days following repeat CT to exclude haemorrhagic transformation*** - In patients with a **large ischaemic stroke** like an MCA territory infarct, anticoagulation is generally delayed for **14 days** to significantly reduce the risk of **haemorrhagic transformation** within the infarcted tissue. - A **repeat CT head** is essential at the end of this period to confirm the absence of bleeding before initiating long-term anticoagulation for **atrial fibrillation** and secondary stroke prevention. *Immediately, as the stroke is cardioembolic* - Initiating anticoagulation **immediately** after a large acute ischaemic stroke carries a high risk of **symptomatic intracranial haemorrhage**, which can dramatically worsen clinical outcomes. - Current guidelines typically recommend starting **antiplatelet therapy** (e.g., aspirin) in the acute phase, reserving anticoagulation for a later, safer window. *After 24 hours if repeat CT shows no haemorrhagic transformation* - A 24-hour delay is insufficient for a **large MCA territory infarct** as the risk of **haemorrhagic transformation** remains elevated throughout the first week post-stroke. - This shorter timeframe is usually considered for **minor ischaemic strokes** or for initiating antiplatelets, not for full anticoagulation in major events. *After 48 hours regardless of repeat imaging* - While 48-72 hours might be considered for **mild to moderate strokes**, it is generally still too early for a **large infarct** like an MCA territory stroke due to the high risk of bleeding. - Commencing anticoagulation without **follow-up imaging** to exclude haemorrhagic transformation is unsafe, as the infarct area is still highly vulnerable. *Anticoagulation is contraindicated following ischaemic stroke* - Anticoagulation is **not contraindicated** but rather **temporarily delayed** following an ischaemic stroke, especially when the cause is **atrial fibrillation**. - It is crucial for **secondary prevention** of future cardioembolic strokes, as the long-term benefits typically outweigh the risks once the acute bleeding risk has subsided.

Question 74: A 57-year-old man with type 2 diabetes presents with a 3-month history of frequent episodes of unilateral throbbing headache lasting 2-3 hours, associated with nausea and photophobia. He has 8-10 episodes per month, causing significant work absence. He takes metformin and gliclazide. Paracetamol provides minimal relief. Neurological examination is normal. What is the most appropriate prophylactic treatment to initiate?

A. Propranolol 80 mg twice daily
B. Topiramate 25 mg at night, increasing gradually (Correct Answer)
C. Amitriptyline 10 mg at night, increasing to 50-75 mg
D. Sodium valproate 300 mg twice daily
E. Pizotifen 0.5 mg at night

Explanation: ***Topiramate 25 mg at night, increasing gradually*** - **Topiramate** is a first-line agent for migraine prophylaxis and is particularly advantageous in this patient with **Type 2 Diabetes** as it is associated with **weight loss** and can improve glycemic control. - The dosage must be **titrated slowly** to mitigate common side effects such as **paresthesia**, cognitive slowing, and the risk of renal calculi. *Propranolol 80 mg twice daily* - **Propranolol** is a first-line prophylactic, but beta-blockers can **mask the symptoms of hypoglycemia**, posing a risk to patients on insulin secretagogues like **gliclazide**. - It may also lead to **weight gain** or metabolic changes that are undesirable in the management of diabetes. *Amitriptyline 10 mg at night, increasing to 50-75 mg* - **Amitriptyline** is an effective second-line option but is frequently associated with **weight gain** and increased appetite, which can worsen **insulin resistance** in diabetic patients. - Side effects such as **sedation** and anticholinergic effects (e.g., dry mouth, blurred vision) may be poorly tolerated compared to other prophylactic agents. *Sodium valproate 300 mg twice daily* - Although effective for migraines, **sodium valproate** is typically reserved for refractory cases due to its significant metabolic profile, including **weight gain** and potential hepatotoxicity. - It also carries a high risk of **teratogenicity**, making it a less favorable first-line choice compared to topiramate, even in male patients, in the context of diabetes. *Pizotifen 0.5 mg at night* - **Pizotifen** is rarely used in contemporary practice as a first-line agent due to its common side effects of **significant weight gain** and sedation. - Its efficacy is generally considered lower than that of **topiramate** or **propranolol** for chronic migraine prevention.

Question 75: An 81-year-old woman is admitted from a care home with acute confusion. She has been increasingly agitated over the past 2 days with visual hallucinations of small animals. Her medications include donepezil 10 mg, memantine 20 mg, and rivastigmine patch 9.5 mg/24h for dementia with Lewy bodies diagnosed 3 years ago. On examination, temperature 37.8°C, BP 110/70 mmHg, oxygen saturation 94% on air. Chest is clear and urinalysis shows blood ++ and leucocytes ++. What is the most important immediate management step?

A. Start oral haloperidol 0.5 mg twice daily for agitation
B. Discontinue all antidementia medications
C. Start intravenous antibiotics for urinary tract infection (Correct Answer)
D. Arrange urgent CT head to exclude subdural haematoma
E. Start oral lorazepam 0.5 mg as required for agitation

Explanation: ***Start intravenous antibiotics for urinary tract infection*** - The patient's acute confusion, agitation, and visual hallucinations suggest **delirium**, which is acutely superimposed on her pre-existing **dementia with Lewy bodies**. - The presence of **fever** (37.8°C) and a **positive urinalysis** (blood ++, leucocytes ++) strongly indicates a **urinary tract infection (UTI)** as the precipitating cause, making prompt intravenous antibiotics the most crucial immediate management step to treat the underlying cause of delirium. *Start oral haloperidol 0.5 mg twice daily for agitation* - Patients with **dementia with Lewy bodies (DLB)** are extremely sensitive to **neuroleptics** like haloperidol, which can cause severe adverse effects including worsening parkinsonism, rigidity, and potentially life-threatening complications. - **Haloperidol** is largely contraindicated in DLB due to this high sensitivity, and its use for agitation would carry significant risks without addressing the underlying infection. *Discontinue all antidementia medications* - Abruptly stopping **cholinesterase inhibitors** (donepezil, rivastigmine) and **NMDA receptor antagonists** (memantine) can lead to a rapid and significant worsening of cognitive function and behavioral symptoms. - While a medication review might be part of long-term care, discontinuing these medications is not the immediate priority for an acute delirious state caused by an infection. *Arrange urgent CT head to exclude subdural haematoma* - While neuroimaging can be important in delirium, this patient has clear evidence of an **infectious cause (UTI)** with fever and positive urinalysis, which is a more immediate and treatable explanation for her acute confusion. - An urgent **CT head** is not the most important immediate step as there is no specific history of trauma or new focal neurological signs to suggest a subdural haematoma as the primary cause. *Start oral lorazepam 0.5 mg as required for agitation* - **Benzodiazepines** like **lorazepam** can exacerbate **delirium** in older adults, increasing confusion, sedation, and the risk of falls, rather than resolving the core issue. - Management of agitation in delirium should primarily focus on treating the underlying cause; benzodiazepines are generally reserved for severe, dangerous agitation as a last resort and used with extreme caution.

Question 76: A 45-year-old woman attends the Emergency Department with a 4-hour history of severe left-sided headache, photophobia, and vomiting. She has a history of migraine with aura. On examination, she is alert, afebrile, with normal fundoscopy and no focal neurological signs. CT head performed 6 hours after onset shows no abnormality. What is the most appropriate next investigation?

A. MRI brain with gadolinium contrast
B. Lumbar puncture with CSF analysis (Correct Answer)
C. CT angiography of cerebral vessels
D. Repeat CT head after 12 hours
E. No further investigation required

Explanation: ***Lumbar puncture with CSF analysis*** - In patients with a suspected **subarachnoid haemorrhage (SAH)** and a negative **CT head** performed more than 6 hours after onset, a **lumbar puncture** is mandatory to exclude the diagnosis. - The CSF must be analysed for **xanthochromia** (the breakdown products of hemoglobin) which usually takes **12 hours** to develop post-ictus. *MRI brain with gadolinium contrast* - While useful for detecting **ischaemic strokes** or **tumors**, MRI is not the gold standard or immediate next step for excluding an acute **SAH** when CT is negative. - It is less sensitive than **CSF analysis** for detecting blood products in the very early subacute phase of a hemorrhage. *CT angiography of cerebral vessels* - This is primarily used to identify the source of bleeding, such as a **berry aneurysm**, once a **SAH** has been confirmed by CT or CSF. - It is not a screening tool to rule out the presence of **subarachnoid blood** itself in the initial diagnostic pathway. *Repeat CT head after 12 hours* - Repeating a **non-contrast CT** is not indicated as the sensitivity for blood actually **decreases** over time as the blood is reabsorbed and becomes isodense. - Failure to visualize blood on the initial scan mandates moving to **CSF analysis** rather than delayed imaging. *No further investigation required* - Relying on a history of **migraine** is dangerous in the context of a sudden-onset "thunderclap" headache, which must be treated as **SAH** until proven otherwise. - Clinical guidelines require definitive exclusion of life-threatening pathology through **LP and xanthochromia** if the 6-hour CT window is exceeded or the scan is negative.

Question 77: A 33-year-old woman presents to neurology clinic with a 5-year history of episodic attacks during sleep. Her partner describes that she suddenly sits up, appears frightened, and makes cycling movements with her legs for about 30 seconds before lying back down. She has no memory of these events. Episodes occur 2-3 times per week. Routine EEG shows no abnormalities. What is the most likely diagnosis?

A. Frontal lobe epilepsy (Correct Answer)
B. Non-REM parasomnia (sleep terror)
C. REM sleep behaviour disorder
D. Psychogenic non-epileptic seizures
E. Temporal lobe epilepsy

Explanation: ***Frontal lobe epilepsy***- Characterized by brief, nocturnal seizures with **bizarre motor automatisms** such as cycling and thrashing, often lasting less than 60 seconds with rapid recovery.- **Routine EEG** is frequently normal as the seizure focus is often deep or obscured by muscle artifact, requiring video-telemetry for confirmation.*Non-REM parasomnia (sleep terror)*- Typically occurs during the **first third of the night** (slow-wave sleep) and features longer durations of autonomic arousal without the coordinated cycling movements seen here.- Less frequent than nocturnal epilepsy and usually lacks the **stereotyped motor patterns** and high frequency of occurrence (2-3 times per week).*REM sleep behaviour disorder*- Usually involves **complex, purposeful movements** that reflect dream enactment and typically occurs in the latter half of the night when REM sleep is most frequent.- Predominantly affects **older adults** and is often associated with neurodegenerative diseases like Parkinson's disease.*Psychogenic non-epileptic seizures*- Usually occur during **wakefulness** rather than sleep, though they may give the appearance of nocturnal events; they are typically much longer in duration.- Often characterized by **emotional triggers**, pelvic thrusting, and variable semiology rather than the brief, stereotyped motor activity described.*Temporal lobe epilepsy*- These seizures are more likely to occur during wakefulness and involve **oroalimentary or manual automatisms** rather than large-scale cycling movements.- Commonly associated with a preceding **aura** (epigastric rising, fear, or deja vu) and post-ictal confusion, which is less prominent in frontal lobe seizures.

Question 78: A 68-year-old man with a history of hypertension and hyperlipidaemia presents with two episodes of left arm weakness and slurred speech in the past week, each lasting approximately 15 minutes and resolving completely. Carotid duplex ultrasonography shows 75% stenosis of the right internal carotid artery. He is currently taking aspirin 75 mg, atorvastatin 80 mg, and amlodipine 10 mg daily. What is the most appropriate next step in management?

A. Continue current medical management and repeat imaging in 3 months
B. Add clopidogrel 75 mg to aspirin for 21 days then continue aspirin alone
C. Arrange urgent carotid endarterectomy within 14 days of symptom onset (Correct Answer)
D. Switch from aspirin to warfarin with target INR 2-3
E. Arrange carotid artery stenting within 4 weeks

Explanation: ***Arrange urgent carotid endarterectomy within 14 days of symptom onset*** - This patient presents with **symptomatic carotid artery stenosis** (transient ischemic attacks) and 75% stenosis, putting him at high risk for a major stroke. - Current guidelines recommend **carotid endarterectomy (CEA)** for patients with 70-99% symptomatic stenosis, ideally performed within **14 days** of symptom onset to maximize stroke risk reduction. *Continue current medical management and repeat imaging in 3 months* - **Medical management** alone is insufficient for symptomatic high-grade stenosis (75%) as the risk of future stroke remains high without mechanical revascularization. - Delaying treatment with **repeat imaging** would miss the crucial window for optimal benefit from surgical intervention in preventing a completed stroke. *Add clopidogrel 75 mg to aspirin for 21 days then continue aspirin alone* - While **dual antiplatelet therapy (DAPT)** is a common adjunct after TIA, it does not replace the need for **mechanical revascularization** in the presence of >70% stenosis. - DAPT aims to reduce short-term risk, but **CEA** is the definitive treatment required to address the underlying anatomical cause of the emboli. *Switch from aspirin to warfarin with target INR 2-3* - **Anticoagulation** with warfarin is indicated for cardioembolic stroke (e.g., in **atrial fibrillation**) but is not superior to antiplatelets for large-vessel **atherosclerotic disease**. - Warfarin carries a higher risk of **intracranial hemorrhage** and does not directly address the carotid narrowing causing the patient's symptoms. *Arrange carotid artery stenting within 4 weeks* - **Carotid artery stenting (CAS)** is generally reserved for patients at high **surgical risk** or those with specific anatomical challenges preventing CEA. - **Carotid endarterectomy** is typically the preferred gold standard for most patients and should be performed more urgently (within 14 days), rather than waiting 4 weeks.

Question 79: A 26-year-old woman with focal epilepsy has been seizure-free for 3 years on lamotrigine 200 mg twice daily. She wishes to discontinue her medication as she is planning pregnancy and is concerned about teratogenicity. Her EEG performed 6 months ago showed occasional sharp waves in the left temporal region. She drives regularly for work. What is the most appropriate advice regarding medication discontinuation?

A. Discontinue lamotrigine immediately as it is teratogenic
B. Switch to levetiracetam before attempting pregnancy
C. Reduce lamotrigine by 25% every 2-3 months and inform DVLA if proceeding (Correct Answer)
D. Continue lamotrigine at the lowest effective dose during pregnancy
E. Discontinue lamotrigine only after becoming pregnant

Explanation: ***Reduce lamotrigine by 25% every 2-3 months and inform DVLA if proceeding***- For patients seizure-free for over 2 years, **gradual withdrawal** (typically 25% reduction every 2-3 months) can be considered, but the patient must be warned of a 40-50% **recurrence risk** exacerbated by her abnormal EEG.- Legal driving requirements (like those of the **DVLA**) necessitate that the patient stops driving during the withdrawal period and for 6 months after the final dose, due to the risk of **seizure recurrence**.*Discontinue lamotrigine immediately as it is teratogenic*- **Abrupt discontinuation** of antiepileptic drugs is contraindicated as it carries a high risk of **rebound seizures** and potentially life-threatening status epilepticus.- Compared to other antiepileptic drugs like valproate, **lamotrigine** is considered one of the safer options during pregnancy with a relatively low **teratogenic risk**.*Switch to levetiracetam before attempting pregnancy*- **Levetiracetam** and lamotrigine have similar safety profiles in pregnancy; switching an already stable patient to a new drug introduces unnecessary risk of **seizure breakthrough** and is not the goal of medication discontinuation.- The patient's primary concern is to discontinue medication due to teratogenicity fears; switching to another AED does not achieve her goal of being **medication-free**.*Continue lamotrigine at the lowest effective dose during pregnancy*- While **lamotrigine** is considered relatively safe in pregnancy, this option contradicts the patient's stated wish to **discontinue medication** due to concerns about teratogenicity.- If continuing, she would need **high-dose folic acid** (5mg) to further mitigate any potential risks, although lamotrigine has a lower risk profile than many other AEDs.*Discontinue lamotrigine only after becoming pregnant*- Discontinuing or significantly changing antiepileptic therapy **during pregnancy** is generally avoided as it exposes the fetus to both the drug's potential effects and the hazards of uncontrolled maternal seizures.- Any planned withdrawal or dose adjustment should ideally be completed **pre-conception** to allow for clinical stability and assessment of seizure recurrence risk before pregnancy.

Question 80: A 70-year-old woman presents to the Emergency Department 3 hours after sudden onset left arm weakness and facial droop. Her NIHSS score is 8. CT head shows no haemorrhage or early ischaemic changes. Blood glucose is 6.2 mmol/L, BP 178/95 mmHg. She takes aspirin 75 mg and atorvastatin 40 mg daily. Her estimated GFR is 55 ml/min/1.73m². She has no history of recent surgery or bleeding. What is the most appropriate immediate management?

A. Administer intravenous alteplase 0.9 mg/kg (Correct Answer)
B. Load with aspirin 300 mg and start dual antiplatelet therapy
C. Lower blood pressure to <140/90 mmHg before further treatment
D. Arrange urgent CT angiography before thrombolysis
E. Arrange urgent thrombectomy without thrombolysis

Explanation: ***Administer intravenous alteplase 0.9 mg/kg*** - The patient presents within the **3-hour window** of symptom onset, which is well within the **4.5-hour therapeutic window** for IV thrombolysis in eligible patients. - The **CT head shows no hemorrhage** and her **blood pressure (178/95 mmHg)** is below the **185/110 mmHg threshold** required for safe administration of alteplase, with no other contraindications. *Load with aspirin 300 mg and start dual antiplatelet therapy* - **Antiplatelet agents** like aspirin should be **delayed for 24 hours** after intravenous thrombolysis to minimize the risk of hemorrhagic transformation. - While antiplatelets are crucial for secondary prevention and acute stroke if thrombolysis is contraindicated, **alteplase** is the priority for eligible patients within the hyperacute window. *Lower blood pressure to <140/90 mmHg before further treatment* - Aggressive blood pressure lowering to **<140/90 mmHg** is generally avoided in the acute phase of ischemic stroke as it can worsen cerebral perfusion. - Blood pressure should only be lowered if it exceeds **185/110 mmHg** (for thrombolysis) or **220/120 mmHg** (if not thrombolysing), and her current BP is within the acceptable range for alteplase. *Arrange urgent CT angiography before thrombolysis* - **Thrombolysis should not be delayed** for advanced imaging like **CT Angiography (CTA)** if the non-contrast CT is clear and the patient is within the time window. - While CTA is useful for identifying **large vessel occlusion** for potential thrombectomy, the priority is to administer IV alteplase as quickly as possible ("**time is brain**"). *Arrange urgent thrombectomy without thrombolysis* - **Intravenous thrombolysis** is the initial first-line treatment for eligible patients with acute ischemic stroke, even if a **large vessel occlusion** is suspected. - **Mechanical thrombectomy** is typically performed *after* or *in conjunction with* IV thrombolysis, especially if the patient is within the extended window or has a large vessel occlusion, unless there are direct contraindications to alteplase which are not present here.

Question 81: A 59-year-old woman with a history of migraines presents with sudden onset severe headache different from her usual migraines. CT head performed 8 hours after symptom onset shows no abnormality. She has mild photophobia and neck stiffness. Blood pressure is 168/94 mmHg. Which investigation should be performed next?

A. Lumbar puncture (Correct Answer)
B. CT angiography
C. MRI brain with gadolinium
D. Repeat CT head in 24 hours
E. Digital subtraction angiography

Explanation: ***Lumbar puncture*** - A **lumbar puncture** is the mandatory next step to exclude **subarachnoid hemorrhage (SAH)** when the clinical suspicion is high (e.g., sudden onset 'thunderclap' headache, meningism) but the initial **CT head** is negative. - It is ideally performed **12 hours** after symptom onset to look for **xanthochromia** via spectrophotometry, which distinguishes true hemorrhage from a traumatic tap. *CT angiography* - **CT angiography** is used to identify the source of bleeding (like an **aneurysm**) once a diagnosis of SAH is confirmed, but it is not sensitive enough to exclude the presence of blood in the subarachnoid space itself. - Using it before confirming SAH via LP could lead to identifying incidental aneurysms that are not the cause of the patient's symptoms. *MRI brain with gadolinium* - While **MRI** can detect blood in later stages, it is not the standard of care for diagnosing **acute subarachnoid hemorrhage** in the emergency setting due to longer acquisition times and lower sensitivity in the acute phase. - **Gadolinium enhancement** is more useful for identifying tumors or inflammatory processes rather than acute vascular events like SAH. *Repeat CT head in 24 hours* - Repeating a **CT head** is not indicated because the sensitivity of CT for SAH **decreases** over time as blood is cleared or diluted by CSF, especially after 6-12 hours. - Delaying further investigation with a repeat scan would dangerously postpone the diagnosis and potential treatment of a **ruptured aneurysm**. *Digital subtraction angiography* - **Digital subtraction angiography (DSA)** is an invasive gold-standard procedure for characterizing **vascular malformations** and planning surgical or endovascular intervention. - It is not performed as a primary screening tool for SAH because it carries risks of **stroke** and does not confirm the presence of subarachnoid blood directly.

Question 82: What is the characteristic EEG finding in Creutzfeldt-Jakob disease?

A. Periodic sharp wave complexes (Correct Answer)
B. 3 Hz spike and wave discharges
C. Alpha coma pattern
D. Focal temporal lobe slowing
E. Continuous spike and wave in slow-wave sleep

Explanation: ***Periodic sharp wave complexes*** - In **Creutzfeldt-Jakob disease (CJD)**, the EEG typically demonstrates **periodic synchronous biphasic or triphasic sharp wave complexes** occurring at a frequency of approximately **1 Hz**. - This pattern is seen in about **60-70%** of patients with sporadic CJD, usually during the **middle to late stages** of the disease course. *3 Hz spike and wave discharges* - This is the classic EEG hallmark of **Absence Epilepsy**, manifesting as brief episodes of impaired consciousness. - Unlike the **rapidly progressive dementia** of CJD, this pattern is associated with a specific pediatric seizure disorder. *Alpha coma pattern* - Characterized by widespread, **non-reactive alpha activity** in the absence of consciousness, reflecting severe **diffuse encephalopathy** or brainstem injury. - This pattern typically occurs after **cardiac arrest** or profound hypoxia, rather than primary prion neurodegeneration. *Focal temporal lobe slowing* - This finding is more suggestive of a focal process like **Herpes Simplex Encephalitis** or a structural lesion within the temporal lobe. - CJD usually presents with **diffuse cortical involvement** rather than isolated focal temporal changes on initial assessment. *Continuous spike and wave in slow-wave sleep* - This EEG pattern is diagnostic for **Landau-Kleffner syndrome** or other specific pediatric epileptic encephalopathies. - It characteristically appears during **Non-REM sleep** and is associated with **acquired aphasia**, not the myoclonus seen in CJD.

Question 83: A 77-year-old man is being treated for an acute ischaemic stroke affecting the left middle cerebral artery territory. On day 3 of admission, he develops worsening confusion, agitation, and a fluctuating level of consciousness. His speech is incoherent. Temperature is 37.2°C, respiratory rate 24/min, oxygen saturation 91% on air. What is the most likely cause of his deterioration?

A. Urinary tract infection
B. Haemorrhagic transformation of the infarct
C. Recurrent stroke
D. Hypoxia secondary to aspiration pneumonia (Correct Answer)
E. Post-stroke seizure

Explanation: ***Hypoxia secondary to aspiration pneumonia***- The patient presents with **tachypnea** and **hypoxia** (SpO2 91%), which are specific clinical indicators of a respiratory complication rather than a purely neurological or urinary event.- **Aspiration pneumonia** is a very common complication following an acute stroke due to **dysphagia** and impaired consciousness, leading to **delirium** and fluctuating consciousness as seen here.*Urinary tract infection*- While **UTI** is a frequent cause of **post-stroke delirium**, it does not typically cause a drop in **oxygen saturation** or a high **respiratory rate**.- This diagnosis should only be considered secondary after ruling out more acute causes of **hypoxia** and respiratory distress.*Haemorrhagic transformation of the infarct*- This complication usually manifests as a sudden **neurological decline** or worsening of focal deficits, rather than isolated **delirium and hypoxia**.- While it can occur within the first few days of a large **MCA territory stroke**, it does not explain the patient's **respiratory compromise**.*Recurrent stroke*- Recurrent stroke would typically present with **new focal neurological signs** (e.g., new limb weakness or cranial nerve deficit) that were not previously present.- It is less likely than a medical complication on **day 3** and would not inherently cause **hypoxia** unless it involves the brainstem severely.*Post-stroke seizure*- **Seizures** can cause a **post-ictal state** with confusion and agitation, but they are unlikely to cause sustained **hypoxia** and tachypnea after the event ends.- While seizures occur in a small percentage of stroke patients, the primary focus must remain on the **respiratory findings** in this clinical picture.

Question 84: A 35-year-old woman presents with a 6-week history of daily headache. She describes a constant, bilateral, pressing sensation like a tight band around her head. The headache is present all day but varies in intensity. There is no nausea, photophobia, or visual symptoms. Neurological examination is normal. What is the most appropriate management?

A. Start amitriptyline 10 mg at night (Correct Answer)
B. Prescribe sumatriptan 50 mg as required
C. Arrange urgent MRI head
D. Advise simple analgesia as required
E. Start propranolol 40 mg twice daily

Explanation: ***Start amitriptyline 10 mg at night*** - This patient presents with a **chronic tension-type headache (TTH)**, indicated by a daily bilateral, "tight band" sensation lasting more than 15 days per month for over 3 months. - **Amitriptyline** is the first-line preventive treatment for chronic TTH and is started at a low dose to improve sleep and modulate pain pathways. *Prescribe sumatriptan 50 mg as required* - **Sumatriptan** is a triptan used specifically for the acute treatment of **migraines** and cluster headaches, not tension-type headaches. - It is ineffective for TTH and is contraindicated if the diagnosis does not involve **vascular** or neurogenic inflammatory components typical of migraines. *Arrange urgent MRI head* - Neuroimaging is not indicated as there are no **red flags** such as papilledema, focal neurological deficits, or sudden "thunderclap" onset. - The **neurological examination** is normal, and the patient’s symptoms are classic for a primary headache disorder rather than a structural lesion. *Advise simple analgesia as required* - While simple analgesics like paracetamol or NSAIDs are used for episodic TTH, daily use in chronic cases poses a high risk of **medication overuse headache**. - Prophylactic management is favored over acute treatment when headaches occur frequently enough to significantly impact quality of life. *Start propranolol 40 mg twice daily* - **Propranolol** is a beta-blocker primarily used for the prophylaxis of **migraines**, not tension-type headaches. - It is less effective than tricyclic antidepressants for the specific pathophysiology of **chronic TTH**.

Question 85: A 53-year-old man presents with a 2-hour history of sudden onset binocular diplopia, dysarthria, and bilateral limb weakness. He has a history of hypertension. Examination reveals bilateral sixth nerve palsies, dysarthria, and quadriparesis. CT head shows a hyperdense lesion in the pons. What is the most likely diagnosis?

A. Pontine haemorrhage (Correct Answer)
B. Basilar artery thrombosis
C. Pontine glioma
D. Multiple sclerosis relapse
E. Posterior circulation ischaemic stroke

Explanation: ***Pontine haemorrhage***- Sudden onset of **binocular diplopia**, **dysarthria**, **bilateral limb weakness** (quadriparesis), and **bilateral sixth nerve palsies** in a patient with a history of **hypertension** is highly indicative of a pontine haemorrhage.- The non-contrast CT head showing a **hyperdense lesion in the pons** is the definitive finding for **acute intracranial haemorrhage**, as fresh blood appears bright on CT.*Basilar artery thrombosis*- While a basilar artery thrombosis can cause similar neurological deficits in the posterior circulation, a non-contrast CT head would typically show **hypodensity** (infarction) or be normal in the hyperacute phase, not a hyperdense lesion.- The **hyperdense lesion within the pons** on CT directly points to blood, differentiating it from an acute thrombotic occlusion.*Pontine glioma*- A pontine glioma would present with a **gradual, progressive worsening** of symptoms over weeks or months, not a sudden onset over 2 hours as described.- On CT, a glioma typically appears as an **expansile mass** with varying signal characteristics, often **hypodense** or mixed, rather than acutely hyperdense.*Multiple sclerosis relapse*- Multiple sclerosis relapses usually develop over **days to weeks** and are rarely of such sudden and severe onset (2 hours) with quadriparesis.- Acute demyelinating plaques in MS are typically **isodense or hypodense** on CT and are better visualized as hyperintense lesions on MRI.*Posterior circulation ischaemic stroke*- An ischaemic stroke, by definition, involves **tissue infarction** due to arterial occlusion, which would result in **hypodensity** on a non-contrast CT scan as oedema and cell death occur.- The presence of a **hyperdense lesion** on CT directly indicates **acute bleeding**, ruling out an ischaemic event.

Question 86: A 69-year-old woman with Alzheimer's dementia (MMSE 14/30) is admitted with aspiration pneumonia. She has been treated with donepezil 10 mg daily for 18 months. Her daughter asks whether the medication should be continued during this acute illness. What is the most appropriate advice?

A. Continue donepezil at current dose (Correct Answer)
B. Discontinue donepezil permanently as MMSE indicates severe disease
C. Reduce donepezil dose to 5 mg during acute illness
D. Stop donepezil temporarily and restart after recovery
E. Switch to rivastigmine patch during acute illness

Explanation: ***Continue donepezil at current dose***- Sudden **discontinuation** of acetylcholinesterase inhibitors like **donepezil** can lead to rapid **cognitive decline** and worsening of behavioral symptoms that may not be reversible upon restarting.- Current guidelines recommend continuing cognitive enhancers during **acute illness** unless there are specific contraindications such as **severe bradycardia**, gastrointestinal obstruction, or severe active vomiting.*Discontinue donepezil permanently as MMSE indicates severe disease*- An MMSE score of 14/30 represents **moderate dementia**, not severe; donepezil is clinically indicated for use in **mild to moderate** stages and often continued into severe stages.- Permanent cessation should only be considered if there is evidence of lack of clinical benefit or **intolerable side effects**, rather than the presence of an intercurrent infection.*Reduce donepezil dose to 5 mg during acute illness*- There is no clinical indication for **dose reduction** during an acute infection like **aspiration pneumonia** if the patient has been stable on 10 mg for 18 months.- Reducing the dose risks losing the achieved **neuroprotective benefits** and stabilizing effects of the medication at a time when the patient is already physiologically stressed.*Stop donepezil temporarily and restart after recovery*- Temporary cessation is unnecessary and potentially harmful due to the risk of **rebound cognitive impairment** and increased **delirium risk** during hospitalization.- If the patient can still take oral medications or if the drug can be administered via a **nasogastric tube**, it should be maintained throughout the admission.*Switch to rivastigmine patch during acute illness*- Switching to a **rivastigmine patch** is not indicated unless the patient is unable to swallow or is experiencing severe **GI side effects** from oral donepezil.- Routine switching of stable medications during acute illness increases the risk of **drug errors** and side effects without providing additional therapeutic benefit for the pneumonia.

Question 87: A 31-year-old woman with known epilepsy presents to the Emergency Department following three seizures over 30 minutes. She remains unconscious between seizures. IV access is obtained. What is the most appropriate first-line treatment?

A. IV lorazepam 4 mg (Correct Answer)
B. IV phenytoin 15-18 mg/kg
C. Rectal diazepam 10 mg
D. IM midazolam 10 mg
E. IV levetiracetam 40 mg/kg

Explanation: ***IV lorazepam 4 mg*** - The patient is in **status epilepticus**, defined as two or more seizures without recovery of consciousness between them; **IV lorazepam** is the gold-standard first-line treatment when **IV access** is available. - It is preferred over other benzodiazepines due to its **rapid onset** and longer duration of action within the central nervous system. *IV phenytoin 15-18 mg/kg* - This is a **second-line** treatment used if seizures persist after two doses of a benzodiazepine. - Phenytoin requires **cardiac monitoring** and is administered more slowly, making it inappropriate for immediate initial stabilization. *Rectal diazepam 10 mg* - Rectal administration is only indicated when **IV access cannot be obtained**, which is not the case here. - It has a shorter duration of action compared to lorazepam and is generally less effective in an **emergency department** setting. *IM midazolam 10 mg* - **Intramuscular midazolam** is a first-line option specifically when **intravenous access** has not yet been established. - Since this patient already has functional **IV access**, IV lorazepam is the preferred route due to more predictable pharmacokinetics. *IV levetiracetam 40 mg/kg* - Like phenytoin, levetiracetam is considered a **second-line anti-epileptic drug (AED)** for status epilepticus. - It is used only after **benzodiazepines** have failed to terminate the seizure activity.

Question 88: A 62-year-old man with atrial fibrillation on warfarin (INR 2.8) presents 90 minutes after sudden onset left hemiparesis and dysphasia. CT head shows no haemorrhage. NIHSS score is 16. His renal function is normal. Which immediate management is most appropriate?

A. Administer IV alteplase immediately
B. Administer prothrombin complex concentrate and IV alteplase (Correct Answer)
C. Give aspirin 300 mg and start IV heparin
D. Withhold all treatment until INR <1.7
E. Arrange urgent mechanical thrombectomy without thrombolysis

Explanation: ***Administer prothrombin complex concentrate and IV alteplase*** - In acute ischaemic stroke, thrombolysis with **IV alteplase** is generally contraindicated if the **INR is >1.7** due to the high risk of haemorrhage. - Rapid reversal of **warfarin** using **Prothrombin Complex Concentrate (PCC)** can lower the INR to safe levels (≤1.7) within minutes, allowing for safe administration of thrombolysis within the 4.5-hour window. *Administer IV alteplase immediately* - Direct administration of thrombolytics while the patient has an **INR of 2.8** is unsafe and significantly increases the risk of **symptomatic intracranial haemorrhage**. - Current guidelines strictly mandate checking the coagulation profile in patients on warfarin before proceeding with **fibrinolytic therapy**. *Give aspirin 300 mg and start IV heparin* - **Aspirin** should be delayed for at least 24 hours after thrombolysis and is not the primary treatment for hyperacute stroke within the thrombolysis window. - **IV heparin** is not indicated for the acute management of ischaemic stroke and may increase the risk of **haemorrhagic transformation** without improving outcomes. *Withhold all treatment until INR <1.7* - Waiting for the **INR** to drop naturally would result in the closure of the therapeutic window for thrombolysis, leading to worse neurological outcomes ("time is brain"). - Unlike **Vitamin K**, which takes hours to work, PCC provides the immediate reversal necessary to proceed with **reperfusion therapy**. *Arrange urgent mechanical thrombectomy without thrombolysis* - While this patient is a candidate for **mechanical thrombectomy** (NIHSS 16, large vessel occlusion likely), thrombolysis should not be withheld if it can be safely delivered via reversal. - Standard of care is "bridging therapy" where **alteplase** is administered alongside the arrangement of **thrombectomy** to maximize the chances of recanalization.

Question 89: A 66-year-old man presents with a 12-month history of progressive cognitive decline. His wife reports personality changes with disinhibited behaviour and apathy. He has developed a sweet tooth and repetitive behaviours. MMSE is 23/30 with relatively preserved memory but poor verbal fluency. MRI shows frontal and anterior temporal lobe atrophy. What is the most likely diagnosis?

A. Alzheimer's disease
B. Vascular dementia
C. Frontotemporal dementia (Correct Answer)
D. Dementia with Lewy bodies
E. Normal pressure hydrocephalus

Explanation: ***Frontotemporal dementia*** - This presentation is classic for **behavioral variant FTD**, characterized by early **personality changes**, **disinhibition**, apathy, a newfound **preference for sweets**, and **repetitive behaviours**. - Neuroimaging typically demonstrates focal **frontal and anterior temporal lobe atrophy**, which correlates with the poor **verbal fluency** and behavioral symptoms despite relatively preserved memory. *Alzheimer's disease* - Primarily presents with **early episodic memory loss** (e.g., difficulty recalling recent events) rather than prominent behavioral changes as the initial symptom. - Neuroimaging usually shows **hippocampal atrophy** and posterior parietal/temporal involvement, not focal frontal-lobe predominant atrophy. *Vascular dementia* - Characterized by a **stepwise decline** in cognitive function related to **cerebrovascular events** or chronic white matter ischemia. - Diagnosis requires evidence of **focal neurological signs** or relevant vascular burden on imaging, which is absent in this description. *Dementia with Lewy bodies* - Features a clinical triad of **fluctuating cognition**, recurrent **visual hallucinations**, and spontaneous **parkinsonism**. - While it can involve neuropsychiatric symptoms, it does not typically show the focal **frontal lobe atrophy** seen on this patient's MRI. *Normal pressure hydrocephalus* - Presents with the classic clinical triad of **gait disturbance** ("magnetic gait"), **urinary incontinence**, and cognitive impairment. - Imaging characteristically shows **ventriculomegaly** out of proportion to sulcal atrophy, not focal frontal/temporal atrophy.

Question 90: A 44-year-old woman presents with recurrent episodes of severe headache over 3 months. Each episode lasts 2-3 hours, occurs 2-3 times per week, and involves severe left temporal throbbing pain with nausea, photophobia, and phonophobia. She takes paracetamol, ibuprofen, and sumatriptan 12-15 days per month with limited relief. What is the most likely diagnosis?

A. Chronic migraine
B. Medication overuse headache (Correct Answer)
C. Cluster headache
D. Tension-type headache
E. Hemicrania continua

Explanation: ***Medication overuse headache*** - The patient's frequent use of acute headache medications (paracetamol, ibuprofen, sumatriptan) for **12-15 days per month** for over 3 months, combined with recurrent severe headaches, strongly points to **medication overuse headache (MOH)**. - MOH is characterized by headache occurring **≥15 days per month** in a patient with a pre-existing primary headache disorder, caused by regular overuse of acute symptomatic medication. *Chronic migraine* - **Chronic migraine** is defined by headache occurring on **≥15 days per month** for at least 3 months, with at least 8 days per month having migraine features. - While the patient experiences frequent headaches with migraine features, the extensive use of abortive medications is the more immediate and crucial diagnosis of **medication overuse headache**, which often underlies and exacerbates chronic migraine. *Cluster headache* - **Cluster headaches** typically involve excruciating, strictly **unilateral periorbital, supraorbital, or temporal pain** lasting 15-180 minutes, accompanied by prominent **ipsilateral autonomic symptoms** (e.g., lacrimation, rhinorrhea, ptosis). - The patient's symptoms (nausea, photophobia, phonophobia) are classic migraine features, and the lack of characteristic autonomic symptoms differentiate it from cluster headache. *Tension-type headache* - **Tension-type headache** is usually described as a bilateral, pressing or tightening pain of mild to moderate intensity, typically **not throbbing** and **not associated with nausea, photophobia, or phonophobia**. - The patient's description of severe **left temporal throbbing pain** with associated nausea, photophobia, and phonophobia is inconsistent with a typical tension-type headache. *Hemicrania continua* - **Hemicrania continua** is characterized by a **continuous, strictly unilateral headache** of moderate intensity with superimposed exacerbations of severe pain, and it shows an **absolute response to indomethacin**. - The patient's headaches are episodic, lasting 2-3 hours and occurring 2-3 times per week, rather than continuous, and there's no mention of indomethacin responsiveness.

Question 91: A 78-year-old woman is admitted with confusion. Her daughter reports a 4-day history of increasing disorientation and visual hallucinations of children in her room. She was started on oxybutynin for urinary incontinence 2 weeks ago. On examination, she is agitated, disoriented in time and place, has a temperature of 38.1°C, and her abbreviated mental test score is 3/10. What is the most appropriate initial investigation?

A. CT head
B. Urinalysis and culture (Correct Answer)
C. Serum thyroid function tests
D. Lumbar puncture
E. EEG

Explanation: ***Urinalysis and culture*** - This patient presents with **acute delirium** (disorientation, agitation, and visual hallucinations); in elderly patients, a **Urinary Tract Infection (UTI)** is the most common reversible cause of such presentations. - The presence of a **fever (38.1°C)** strongly points toward an underlying infection, making a screen for **urosepsis** the most appropriate and immediate diagnostic step. *CT head* - Indicated primarily when there is a history of **head trauma**, new **focal neurological deficits**, or signs of raised intracranial pressure. - While important in some cases of confusion, it is less urgent than ruling out common **sepsis** or metabolic triggers in a febrile elderly patient. *Serum thyroid function tests* - Hypo- or hyperthyroidism can cause cognitive changes, but they typically lead to a more **subacute or chronic** metabolic encephalopathy rather than an acute febrile delirium. - These tests are part of a **dementia screen** or workup for persistent confusion but are not the priority in the acute stage of suspected infection. *Lumbar puncture* - Reserved for cases where **meningitis** or **encephalitis** is suspected, usually accompanied by neck stiffness, photophobia, or extreme lethargy. - It is an invasive procedure and should only be performed after more common sources of infection, like **UTIs or pneumonia**, have been excluded. *EEG* - Primarily used in the evaluation of **non-convulsive status epilepticus** or specific encephalopathies like Creutzfeldt-Jakob disease. - Although delirium shows **generalized slowing** on an EEG, it lacks the specificity needed to identify the underlying trigger and does not guide initial management.

Question 92: A 58-year-old man with type 2 diabetes presents with a 3-week history of severe right-sided facial pain. He describes electric shock-like pains lasting seconds, triggered by chewing and touching his face. Examination shows no sensory deficit. MRI brain shows a vascular loop in contact with the right trigeminal nerve. What is the first-line medical treatment?

A. Carbamazepine (Correct Answer)
B. Gabapentin
C. Amitriptyline
D. Sumatriptan
E. Prednisolone

Explanation: ***Carbamazepine*** - The clinical presentation of **paroxysmal**, electric shock-like pain triggered by tactile stimuli, along with MRI evidence of **neurovascular compression** of the trigeminal nerve, is classic for **trigeminal neuralgia**. - **Carbamazepine** is the established **first-line medical treatment** for trigeminal neuralgia, working by stabilizing inactivated sodium channels and reducing neuronal excitability. *Gabapentin* - While effective for various forms of **neuropathic pain** and sometimes used in trigeminal neuralgia, **gabapentin** is generally considered a second-line agent or an add-on therapy. - It is typically reserved for patients who cannot tolerate or do not respond adequately to **carbamazepine** or oxcarbazepine. *Amitriptyline* - **Amitriptyline**, a **tricyclic antidepressant**, is commonly used for chronic neuropathic pain syndromes such as **post-herpetic neuralgia** or **fibromyalgia**. - It is not considered a first-line agent for the acute, paroxysmal, and distinct electric shock-like pain characteristic of **trigeminal neuralgia**. *Sumatriptan* - **Sumatriptan** is a **5-HT1B/1D receptor agonist** primarily used for the acute treatment of **migraine** and **cluster headaches**. - It has no role in the management of **trigeminal neuralgia**, which is a condition involving the trigeminal nerve itself, often due to compression. *Prednisolone* - **Prednisolone**, a corticosteroid, is used for inflammatory conditions like **temporal arteritis** or certain autoimmune neuropathies. - **Trigeminal neuralgia** is typically caused by neurovascular compression, not inflammation, so **corticosteroids** are not an effective treatment.

Question 93: A 25-year-old woman has her first generalised tonic-clonic seizure. She describes a 2-year history of brief episodes occurring shortly after waking where her right arm jerks involuntarily for a few seconds without loss of consciousness. EEG shows generalised polyspike and wave discharges. What is the most likely diagnosis?

A. Temporal lobe epilepsy
B. Juvenile myoclonic epilepsy (Correct Answer)
C. Panayiotopoulos syndrome
D. Focal motor epilepsy with secondary generalisation
E. Progressive myoclonic epilepsy

Explanation: ***Juvenile myoclonic epilepsy*** - Characterized by **myoclonic jerks** that occur shortly after waking, often of the upper limbs, and a **generalized tonic-clonic seizure**, typically presenting in adolescence or early adulthood. - The EEG showing **generalized polyspike and wave discharges** is a diagnostic hallmark, especially in a young adult with these clinical features. *Temporal lobe epilepsy* - Presents with **focal seizures** involving altered awareness, often preceded by a distinct **aura** (e.g., epigastric rising, olfactory hallucinations). - EEG typically shows **focal epileptiform discharges** or slowing localized to the **temporal regions**, not generalized polyspike discharges. *Panayiotopoulos syndrome* - This is a benign childhood epilepsy, typically affecting children aged **3 to 6 years**, not a 25-year-old adult. - Seizures are characterized by prominent **autonomic symptoms** (e.g., vomiting, pallor) and are often **nocturnal**, which differs from the patient's presentation. *Focal motor epilepsy with secondary generalisation* - While the arm jerks are focal, the crucial differentiating factor is the EEG showing **generalized polyspike and wave discharges**, not focal epileptiform activity preceding generalization. - The characteristic onset shortly after waking and the generalized EEG pattern point away from a purely focal onset with secondary generalization. *Progressive myoclonic epilepsy* - A rare group of severe disorders characterized by myoclonus, tonic-clonic seizures, and **progressive neurological decline** (e.g., ataxia, dementia). - The patient's 2-year history lacks any mention of **neurological deterioration**, which is a defining feature of this condition.

Question 94: A 70-year-old woman presents with sudden onset left-sided weakness and dysphasia. CT head performed within 2 hours shows no haemorrhage. She has a history of atrial fibrillation but stopped warfarin 6 months ago. Her NIHSS score is 14. Blood pressure is 185/105 mmHg. Blood glucose is 8.2 mmol/L. What is the most appropriate immediate management?

A. Administer IV alteplase and defer antihypertensive treatment
B. Reduce blood pressure to below 185/110 mmHg then administer IV alteplase (Correct Answer)
C. Start aspirin 300 mg immediately
D. Arrange CT angiography before any treatment
E. Administer IV alteplase and commence IV labetalol simultaneously

Explanation: ***Reduce blood pressure to below 185/110 mmHg then administer IV alteplase*** - This patient presents with acute ischemic stroke symptoms within the **4.5-hour window**, has no hemorrhage on CT, and a high **NIHSS score (14)**, making her a candidate for **IV alteplase**. - However, the patient's current blood pressure of 185/105 mmHg is above the threshold; it must be lowered to **below 185/110 mmHg** *before* alteplase administration to minimize the risk of **symptomatic intracranial hemorrhage**. *Administer IV alteplase and defer antihypertensive treatment* - Administering **alteplase** with a blood pressure at or above **185/110 mmHg** is a major contraindication due to the significantly increased risk of **hemorrhagic transformation**. - Blood pressure *must* be reduced promptly using intravenous agents like **labetalol** or **nicardipine** prior to initiating thrombolysis. *Start aspirin 300 mg immediately* - For patients eligible for **IV thrombolysis**, aspirin is strictly contraindicated for **24 hours** after the alteplase infusion to prevent an increased risk of bleeding. - Aspirin is the immediate management only if thrombolysis is contraindicated or the patient presents outside the eligible time window. *Arrange CT angiography before any treatment* - While **CT angiography** is crucial for identifying **large vessel occlusions** for potential **endovascular thrombectomy**, it should not delay the administration of **IV alteplase** in an eligible patient. - The principle of "**time is brain**" dictates that thrombolysis should be initiated as soon as non-contrast CT excludes **hemorrhage** and blood pressure is controlled. *Administer IV alteplase and commence IV labetalol simultaneously* - Current guidelines stipulate that the target blood pressure of **<185/110 mmHg** must be achieved *prior* to starting the **alteplase** bolus. - Simultaneous administration does not guarantee that the blood pressure is adequately controlled *before* the thrombolytic agent exerts its effects, thus increasing the risk of **intracranial hemorrhage**.

Question 95: A 52-year-old woman describes episodes where she experiences an unpleasant rising epigastric sensation, followed by impaired awareness lasting 1-2 minutes during which she makes chewing movements and picks at her clothes. Afterwards she is confused for several minutes. EEG shows spikes in the left temporal region. What is the most appropriate first-line antiepileptic drug?

A. Lamotrigine or levetiracetam (Correct Answer)
B. Sodium valproate
C. Carbamazepine
D. Phenytoin
E. Ethosuximide

Explanation: ***Lamotrigine or levetiracetam*** - The patient's presentation with a **rising epigastric sensation**, **impaired awareness**, **automatisms** (chewing movements, picking at clothes), and **post-ictal confusion** are classic features of **focal seizures with impaired awareness**, specifically originating from the **temporal lobe** as indicated by the EEG spikes. - Both **Lamotrigine** and **Levetiracetam** are recommended as first-line monotherapy for focal seizures due to their broad efficacy, good tolerability profile, and fewer drug interactions compared to older antiepileptics. *Sodium valproate* - While effective for various seizure types, **sodium valproate** is typically considered a primary option for **generalized epilepsies** and is less preferred as first-line for focal seizures compared to newer agents. - It carries significant **teratogenic risks**, including neural tube defects and developmental delays, making it a less suitable choice for women of childbearing potential unless no other options are available and a pregnancy prevention program is in place. *Carbamazepine* - **Carbamazepine** was historically a first-line agent for focal seizures but is now often bypassed due to its **enzyme-inducing properties**, which lead to numerous drug-drug interactions, and its potential for more adverse effects. - It can cause side effects such as **hyponatremia** and has a higher risk of teratogenicity compared to newer drugs like lamotrigine or levetiracetam. *Phenytoin* - **Phenytoin** is generally considered a second- or third-line antiepileptic drug for chronic management of focal seizures due to its **narrow therapeutic index** and dose-dependent, non-linear pharmacokinetics, making dosing challenging. - Long-term use is associated with notable side effects including **gingival hyperplasia**, **hirsutism**, **acne**, and potentially **cerebellar atrophy**. *Ethosuximide* - **Ethosuximide** is specifically and exclusively indicated for the treatment of **absence seizures** (petit mal seizures) and is not effective for focal seizures or generalized tonic-clonic seizures. - Its mechanism of action involves blocking **T-type calcium channels** in the thalamus, which is specific to the pathophysiology of absence seizures and does not address the type of focal seizure seen in this patient.

Question 96: A 73-year-old woman is admitted with acute left hemiparesis. CT shows a right middle cerebral artery territory infarct with significant oedema. Over 24 hours she becomes increasingly drowsy with a GCS of 10. Repeat CT shows increasing midline shift and early uncal herniation. Blood pressure is 168/96 mmHg. What is the most appropriate management?

A. Urgent referral to neurosurgery for decompressive hemicraniectomy (Correct Answer)
B. Intravenous mannitol and maintain head elevation
C. Controlled blood pressure reduction to target 140/90 mmHg
D. Intravenous dexamethasone 8mg four times daily
E. Intubation and hyperventilation to target PaCO2 4.0-4.5 kPa

Explanation: ***Urgent referral to neurosurgery for decompressive hemicraniectomy*** - This patient presents with rapidly worsening neurological status (decreasing GCS), evidence of **malignant middle cerebral artery (MCA) infarction** with significant **oedema**, increasing **midline shift**, and early **uncal herniation**. - **Decompressive hemicraniectomy** is the most effective treatment for large hemispheric strokes causing mass effect and impending herniation, significantly reducing mortality and improving functional outcomes in eligible patients. *Intravenous mannitol and maintain head elevation* - While **mannitol** and head elevation are initial **medical strategies** to reduce **intracranial pressure (ICP)**, they are temporizing measures and often insufficient for severe, progressive mass effect and mechanical herniation. - These interventions provide symptomatic relief but do not address the underlying expansive lesion causing the **malignant brain swelling**. *Controlled blood pressure reduction to target 140/90 mmHg* - Lowering blood pressure aggressively in an acute ischemic stroke with **raised ICP** can compromise **cerebral perfusion pressure (CPP)**, potentially extending the ischemic injury in the penumbra. - Current guidelines generally recommend maintaining a higher blood pressure in acute ischemic stroke to ensure adequate cerebral perfusion, especially in the absence of thrombolysis, unless BP is excessively high (e.g., >220/120 mmHg). *Intravenous dexamethasone 8mg four times daily* - **Corticosteroids** like dexamethasone are effective for **vasogenic edema** associated with tumors or infections, but they are not beneficial for **cytotoxic edema** seen in ischemic stroke and can even worsen outcomes. - Steroids can increase the risk of complications such as hyperglycemia and infection in stroke patients without improving neurological recovery. *Intubation and hyperventilation to target PaCO2 4.0-4.5 kPa* - **Hyperventilation** acutely lowers ICP by causing **cerebral vasoconstriction** due to reduced PaCO2, but its effect is transient and can lead to **secondary ischemia** by reducing cerebral blood flow to critical areas. - This measure is typically reserved as a very short-term bridge to definitive surgical intervention or in cases of acute, life-threatening ICP elevation, and sustained use is discouraged due to risks.

Question 97: A 61-year-old man with hypertension and hyperlipidaemia presents 36 hours after sudden onset right arm weakness and dysphasia that lasted 2 hours and fully resolved. CT head shows no acute changes. Carotid Doppler shows 55% stenosis of the left internal carotid artery. His ABCD² score is 5. What is the most appropriate management regarding antiplatelet therapy?

A. Aspirin 300mg loading dose then clopidogrel 75mg daily
B. Aspirin 300mg daily alone for 2 weeks then clopidogrel 75mg daily
C. Aspirin 300mg loading dose then aspirin 75mg plus clopidogrel 75mg daily for 21 days, then clopidogrel alone (Correct Answer)
D. Clopidogrel 300mg loading dose then 75mg daily alone
E. Start warfarin with target INR 2-3

Explanation: ***Aspirin 300mg loading dose then aspirin 75mg plus clopidogrel 75mg daily for 21 days, then clopidogrel alone*** - For high-risk **Transient Ischaemic Attack (TIA)** defined by an **ABCD² score ≥4** or minor stroke, current clinical practice (based on **POINT/CHANCE trials**) recommends immediate **Dual Antiplatelet Therapy (DAPT)**. - **DAPT** for the first **21 days** significantly reduces the risk of early stroke recurrence compared to monotherapy, followed by long-term **clopidogrel** monotherapy. *Aspirin 300mg loading dose then clopidogrel 75mg daily* - This regimen constitutes an immediate switch to **clopidogrel monotherapy**, which is less effective than **DAPT** in preventing recurrent events during the first 3 weeks. - It fails to utilize the synergistic effect of both antiplatelets during the period of highest risk following a **TIA**. *Aspirin 300mg daily alone for 2 weeks then clopidogrel 75mg daily* - Previous guidelines used **aspirin monotherapy** until carotid imaging, but modern evidence favors **DAPT** for patients with high-risk clinical scores. - Using only one agent does not provide optimal protection for a patient with an **ABCD² score of 5** and significant **carotid stenosis**. *Clopidogrel 300mg loading dose then 75mg daily alone* - While **clopidogrel** is the standard for long-term secondary prevention, it is not recommended as a solo loading agent for acute **TIA** management in the absence of contraindications to aspirin. - Evidence specifically supports the combination of **aspirin and clopidogrel** to quickly stabilize the prothrombotic state in high-risk patients. *Start warfarin with target INR 2-3* - **Warfarin** or other anticoagulants are indicated for secondary prevention only if there is a diagnosed **cardioembolic source**, such as **atrial fibrillation**. - This patient's symptoms are likely due to **large artery atherosclerosis** (carotid stenosis), for which **antiplatelet therapy** is the appropriate pharmacological intervention.

Question 98: A 38-year-old woman presents to the Emergency Department with sudden onset 'worst ever' headache that reached maximum intensity within seconds while lifting weights at the gym. She has photophobia and neck stiffness. CT head performed 8 hours after symptom onset is reported as normal. What is the most appropriate next investigation?

A. Repeat CT head in 24 hours
B. Lumbar puncture with spectrophotometry for xanthochromia (Correct Answer)
C. CT angiography of cerebral vessels
D. MRI brain with gadolinium contrast
E. No further investigation required as CT was normal

Explanation: ***Lumbar puncture with spectrophotometry for xanthochromia***- This patient presents with classic symptoms of **subarachnoid haemorrhage (SAH)**: sudden onset 'worst ever' headache (thunderclap headache), photophobia, and neck stiffness, especially after exertion.- Even with a normal CT head, if the scan was performed more than 6 hours after symptom onset (here, 8 hours), its sensitivity for SAH decreases. A **lumbar puncture (LP)** for **xanthochromia** is crucial to definitively rule out SAH in such high-suspicion cases, typically performed 12 hours post-onset to allow for bilirubin formation.*Repeat CT head in 24 hours*- The sensitivity of non-contrast CT for SAH **decreases significantly** after 6-12 hours due to blood dilution and resorption.- Repeating a CT scan would further delay the definitive diagnosis and is unlikely to yield new information if the initial scan was already negative beyond the acute window.*CT angiography of cerebral vessels*- **CT angiography (CTA)** is used to identify the **source of bleeding**, such as an aneurysm, after SAH has been confirmed.- It is not a primary diagnostic tool to confirm the presence of SAH itself when initial imaging is equivocal, but rather a follow-up test once SAH is diagnosed.*MRI brain with gadolinium contrast*- While MRI can detect subarachnoid blood, especially with specific sequences, it is generally **less readily available** and **not the first-line investigation** for acute SAH in the emergency setting compared to CT or LP.- For suspected SAH with a negative CT performed late, **lumbar puncture** remains the gold standard for ruling out blood in the CSF.*No further investigation required as CT was normal*- Given the classic presentation of a **thunderclap headache** and the timing of the CT (8 hours post-onset), a normal CT does not reliably exclude SAH due to its **reduced sensitivity** beyond 6 hours.- Discharging the patient without further investigation would be a **high-risk decision** given the potentially life-threatening nature of SAH.

Question 99: A 65-year-old man with progressive cognitive decline over 18 months presents with recurrent detailed visual hallucinations of people in his house, marked fluctuations in alertness during the day, and spontaneous parkinsonian features with rigidity and bradykinesia. CT head shows generalised atrophy. What is the most likely diagnosis?

A. Dementia with Lewy bodies (Correct Answer)
B. Alzheimer's dementia with parkinsonian features
C. Parkinson's disease with dementia
D. Vascular dementia with lacunar infarcts
E. Progressive supranuclear palsy

Explanation: ***Dementia with Lewy bodies*** - This patient presents with **progressive cognitive decline**, **recurrent detailed visual hallucinations**, **marked fluctuations in alertness**, and **spontaneous parkinsonian features** (rigidity, bradykinesia), which is the classic diagnostic tetrad. - The co-occurrence of these specific symptoms points strongly towards **Dementia with Lewy bodies (DLB)**, distinguishing it from other neurodegenerative conditions. *Alzheimer's dementia with parkinsonian features* - **Alzheimer's dementia** primarily manifests with early and prominent **episodic memory loss**, followed by other cognitive deficits. Parkinsonian features are usually a **late complication**. - The striking visual hallucinations and marked fluctuations in alertness are **atypical** as early or core features of Alzheimer's disease. *Parkinson's disease with dementia* - This diagnosis requires that **motor symptoms of Parkinson's disease** must precede the onset of dementia by **at least one year** (the "1-year rule"). - In this case, the cognitive decline and parkinsonian features seem to have a more concurrent or closely timed onset, making **DLB** a more fitting diagnosis. *Vascular dementia with lacunar infarcts* - **Vascular dementia** is typically characterized by a **stepwise decline** in cognitive function or a clear association with **cerebrovascular events**. - While generalized atrophy is present, the specific combination of visual hallucinations, fluctuations, and parkinsonism is **not characteristic** of vascular dementia. *Progressive supranuclear palsy* - **Progressive supranuclear palsy (PSP)** is defined by early and frequent **falls** due to postural instability, **vertical supranuclear gaze palsy**, and **axial rigidity**. - Recurrent detailed visual hallucinations and marked fluctuations in alertness are **not typical** features of PSP.

Question 100: A 47-year-old woman presents with episodic severe right periorbital pain lasting 45-60 minutes, occurring 2-3 times daily for the past 2 weeks. During attacks she has right-sided lacrimation, conjunctival injection and nasal congestion. Between attacks she is completely well. What is the most appropriate acute treatment for individual attacks?

A. Subcutaneous sumatriptan 6mg or high-flow oxygen 100% 12-15 L/min (Correct Answer)
B. Oral sumatriptan 50mg
C. Oral prednisolone 60mg
D. Indomethacin 75mg three times daily
E. Oral paracetamol 1g with codeine 30mg

Explanation: ***Subcutaneous sumatriptan 6mg or high-flow oxygen 100% 12-15 L/min*** - This patient exhibits classic **cluster headache** features, including severe unilateral periorbital pain and **ipsilateral autonomic symptoms** (lacrimation, nasal congestion). - **High-flow oxygen** and **subcutaneous sumatriptan** are the first-line acute treatments because they provide the rapid onset of action required for short-duration attacks. *Oral sumatriptan 50mg* - **Oral triptans** have a slow onset of action (typically 30–60 minutes), which is ineffective for attacks that peak and often resolve quickly. - **Subcutaneous** or nasal routes are preferred to ensure the medication works before the cluster headache attack naturally ends. *Oral prednisolone 60mg* - **Prednisolone** is used as a **transitional prophylactic** treatment to reduce the frequency of attacks during a cluster period. - It does not work quickly enough to provide relief for an **acute individual attack** occurring in real-time. *Indomethacin 75mg three times daily* - This is the pathognomonic treatment for **paroxysmal hemicrania**, which presents with shorter, more frequent attacks (typically >5 per day). - **Cluster headaches** do not show the same dramatic, diagnostic response to **indomethacin** that other trigeminal autonomic cephalalgias do. *Oral paracetamol 1g with codeine 30mg* - Simple analgesics and **opioid combinations** are generally ineffective for the severe, penetrating pain associated with **cluster headaches**. - Relying on codeine increases the risk of **medication overuse headache** without addressing the underlying pathophysiology of the attack.

Question 101: A 76-year-old woman with Alzheimer's dementia (MMSE 16/30) has progressive functional decline. She lives alone and was found by neighbours having not eaten for several days. Her daughter reports she leaves the gas cooker on and has gotten lost twice in familiar places. What is the most appropriate next step in her management?

A. Arrange urgent social services assessment for care package and consider safeguarding (Correct Answer)
B. Increase her cholinesterase inhibitor dose
C. Arrange direct admission to a nursing home
D. Refer to psychiatry for compulsory admission under Mental Health Act
E. Prescribe antipsychotic medication to improve orientation

Explanation: ***Arrange urgent social services assessment for care package and consider safeguarding*** - The patient is at significant risk of **self-neglect** (malnutrition, gas hazards) and physical harm (getting lost), necessitating an immediate evaluation of her **safety** and living environment. - An urgent assessment allows for the implementation of a professional **care package** or potential transition to a safer living setting, while addressing **safeguarding** concerns due to her vulnerability and inability to care for herself. *Increase her cholinesterase inhibitor dose* - While cholinesterase inhibitors are used in **Alzheimer's dementia** to manage cognitive symptoms, increasing the dose will not address the immediate and life-threatening **safety risks** identified. - Medication adjustments focus on cognitive symptom management rather than solving acute **functional decline** or environmental hazards that pose an immediate risk. *Arrange direct admission to a nursing home* - Direct admission to a nursing home without a formal **needs assessment** or a **mental capacity assessment** bypasses legal and ethical protocols, particularly the principle of the 'least restrictive' option. - **Social services** must first evaluate if the patient can be supported at home with a care package before considering permanent institutionalization, especially without clear evidence of her wishes or capacity. *Refer to psychiatry for compulsory admission under Mental Health Act* - The **Mental Health Act** is generally used for acute psychiatric crises or risks resulting from a severe mental disorder where detention is necessary for the patient's or others' safety, not primarily for long-term **dementia care** and placement issues. - The primary issue here is **social care** and capacity for independent living, which is better managed under a framework like the **Mental Capacity Act** in conjunction with social services, focusing on her best interests. *Prescribe antipsychotic medication to improve orientation* - Antipsychotics do not improve **orientation** or general cognitive function in dementia; they are primarily used for severe **behavioral and psychological symptoms of dementia (BPSD)** such as aggression, hallucinations, or delusions. - These medications carry significant risks in elderly patients with dementia, including an increased risk of **stroke**, **cardiac events**, and **mortality**, and should only be used judiciously for specific indications.

Question 102: A 29-year-old man with newly diagnosed focal epilepsy is started on antiepileptic medication. He should be advised to inform the DVLA and stop driving. After what minimum seizure-free period can he reapply for a Group 1 (car) driving licence if seizures are controlled with medication?

A. 12 months (Correct Answer)
B. 6 months
C. 3 months
D. 24 months
E. 5 years

Explanation: ***12 months***- **DVLA (Driver and Vehicle Licensing Agency)** regulations stipulate a **minimum seizure-free period of 12 months** for individuals with a newly diagnosed or recurrent epileptic seizure to reapply for a **Group 1 (car)** driving licence.- This period ensures a sufficient duration of **seizure control** to mitigate the risk of recurrence while driving, even when seizures are managed with **antiepileptic medication**.*6 months*- A **6-month seizure-free period** is generally not sufficient for reapplication for a Group 1 licence after a diagnosis of **epilepsy**.- This shorter period might apply in very specific circumstances, such as a **single isolated unprovoked seizure** with normal investigations, but not for an established diagnosis of **focal epilepsy**.*3 months*- A **3-month seizure-free period** is significantly shorter than the required duration by the **DVLA** for patients with epilepsy.- This period does not provide adequate evidence of **sustained seizure control** to ensure public safety on the road.*24 months*- While a longer seizure-free period is always better, **24 months** is not the *minimum* required period for a **Group 1 (car)** driving licence after controlled epilepsy.- The **12-month** mark is the established minimum for reapplication, assuming sustained control and medical fitness to drive.*5 years*- A **5-year seizure-free period** is a requirement for certain **Group 2 (lorry/bus)** driving licences, which have much stricter medical standards due to the nature of the vehicles and the potential for greater harm.- It is not the minimum requirement for a standard **Group 1 (car or motorcycle)** licence.

Question 103: A 56-year-old woman presents with a 6-hour history of right arm weakness, dysarthria and right facial droop. CT head shows no haemorrhage but an established left basal ganglia infarct from 2 years ago. MRI shows acute left middle cerebral artery territory infarction and vessel imaging shows 90% left internal carotid artery stenosis. What is the most appropriate timing for carotid intervention?

A. Within 48 hours of symptom onset (Correct Answer)
B. After 2 weeks but within 3 months
C. After 6 months to allow stroke stabilisation
D. Carotid intervention is contraindicated due to previous stroke
E. Immediately in the emergency department

Explanation: ***Within 48 hours of symptom onset*** - This is the **most appropriate timing** for carotid intervention in patients with symptomatic, severe carotid stenosis (70-99%) who have experienced a minor or moderate stroke. - Evidence suggests that intervening **early (ideally within 48 hours, and definitely within 2 weeks)** significantly reduces the risk of recurrent ischemic stroke, which is highest in the immediate post-stroke period. *After 2 weeks but within 3 months* - Delaying carotid intervention beyond **two weeks** after a symptomatic event substantially diminishes the benefit, as the risk of **recurrent stroke** decreases significantly after this initial high-risk period. - While still within the window for some benefit, the **optimal window** for maximal risk reduction has passed, and patients are exposed to unnecessary risk during the waiting period. *After 6 months to allow stroke stabilisation* - Such a prolonged delay is **not recommended** for symptomatic severe carotid stenosis as it misses the critical window for **secondary stroke prevention**. - The rationale for waiting is typically applied to very severe or disabling strokes where the risk of **perioperative complications** outweighs early benefits, which is not described in this case. *Carotid intervention is contraindicated due to previous stroke* - A **prior stable stroke** (like the 2-year-old left basal ganglia infarct) is not a contraindication to carotid intervention, especially when there's an acute, **symptomatic severe stenosis** in a different territory. - The intervention is aimed at preventing further **ischemic events** in the territory supplied by the critically stenosed ICA, not treating the old infarct. *Immediately in the emergency department* - Carotid intervention (endarterectomy or stenting) is an elective procedure that requires **pre-operative assessment**, including a detailed neurological evaluation and optimization of medical management. - While urgent, it is typically performed in an **operating room** or interventional suite and not immediately upon arrival in the emergency department like thrombolysis or mechanical thrombectomy.

Question 104: An 82-year-old man in the stroke unit develops sudden agitation, visual hallucinations of small animals, and disorientation 48 hours after admission for ischaemic stroke. He is apyrexial. Observations show oxygen saturation 94% on room air, pulse 88/min regular, BP 142/84 mmHg. What is the most appropriate initial investigation?

A. Urinalysis and urine culture
B. Repeat CT head
C. Blood glucose measurement (Correct Answer)
D. Chest X-ray
E. Serum calcium and thyroid function tests

Explanation: ***Blood glucose measurement*** - Sudden onset of **delirium** (agitation, visual hallucinations, and disorientation) in an elderly patient, particularly post-stroke, mandates immediate exclusion of **hypoglycaemia**. - This is a rapid, reversible cause of neurological dysfunction that can be quickly identified and treated at the bedside, preventing further **neurological damage**. *Urinalysis and urine culture* - While **Urinary Tract Infections (UTIs)** are a common cause of delirium in the elderly, this patient is **apyrexial** and has stable vital signs, making it less urgent as an initial investigation. - This investigation should follow the exclusion of acute, life-threatening metabolic emergencies like **hypoglycaemia**. *Repeat CT head* - A repeat CT head primarily looks for **haemorrhagic transformation**, **cerebral oedema**, or a new stroke, which are typically indicated by new focal neurological deficits. - It is not the most appropriate *initial* bedside investigation for acute mental status changes without specific neurological signs warranting immediate imaging. *Chest X-ray* - A **Chest X-ray** is indicated to rule out pulmonary infections like **aspiration pneumonia**, which can cause delirium, especially in stroke patients. - However, the patient's oxygen saturation (94% on room air) is reasonable, and checking **blood glucose** takes immediate priority for acute mental status changes. *Serum calcium and thyroid function tests* - These tests are important for a comprehensive delirium workup to identify chronic or subacute metabolic disturbances like **hypercalcaemia** or **thyroid dysfunction**. - However, their results are not immediately available, and the clinical presentation of sudden, acute delirium prioritizes rapid bedside tests for reversible causes.

Question 105: A 43-year-old woman describes episodes of seeing flashing zigzag lines in both visual fields lasting 20 minutes, followed by severe unilateral throbbing headache, nausea and photophobia lasting 8 hours. She has 2-3 episodes monthly. Which prophylactic medication is contraindicated if she has a history of depression and asthma?

A. Propranolol (Correct Answer)
B. Amitriptyline
C. Topiramate
D. Candesartan
E. Sodium valproate

Explanation: ***Propranolol***- **Propranolol** is a non-selective **beta-blocker** that is contraindicated in patients with **asthma** as it can cause life-threatening **bronchospasm** by blocking beta-2 receptors in the lungs.- It is also generally avoided in patients with a history of **depression**, as beta-blockers have been associated with worsening of depressive symptoms and lethargy.*Amitriptyline*- This **tricyclic antidepressant** is often a preferred choice for migraine prophylaxis in patients with comorbid **depression** or insomnia.- It does not cause bronchoconstriction and is safe for use in patients with **asthma**.*Topiramate*- **Topiramate** is an effective prophylactic agent, but it is primarily cautioned against in patients with **glaucoma** or a history of **kidney stones**.- While it can occasionally cause **mood disturbances** or cognitive slowing, it is not contraindicated by **asthma**.*Candesartan*- This **angiotensin II receptor blocker (ARB)** is an alternative second-line therapy for migraine prophylaxis with a favorable side effect profile.- It has no known adverse interactions with **asthma** or **depression**, making it a safe option for this patient.*Sodium valproate*- **Sodium valproate** is used for migraine prevention but is strictly avoided in **women of childbearing potential** due to its high **teratogenic risk**.- It does not worsen **asthma** or **depression**, although it may cause weight gain and liver enzyme elevations.

Question 106: A 19-year-old woman presents to the Emergency Department having had three generalised tonic-clonic seizures in the past hour without regaining consciousness between episodes. She has no history of epilepsy. What is the third-line treatment if initial benzodiazepines and second-line therapy fail to terminate the seizures?

A. General anaesthesia with propofol or thiopental (Correct Answer)
B. Intravenous phenobarbital
C. Intravenous magnesium sulphate
D. Oral carbamazepine via nasogastric tube
E. Intravenous methylprednisolone

Explanation: ***General anaesthesia with propofol or thiopental*** - If **status epilepticus** persists despite initial benzodiazepines (first-line) and a second-line antiepileptic drug (e.g., phenytoin, fosphenytoin, levetiracetam), the condition becomes **refractory status epilepticus**. - Third-line treatment involves inducing **general anaesthesia** with agents like **propofol** or **thiopental** in an **Intensive Care Unit (ICU)** setting, often guided by **EEG monitoring** to achieve burst suppression. *Intravenous phenobarbital* - While **phenobarbital** is an antiepileptic, it is typically considered a **second-line agent** or an alternative if other second-line drugs are contraindicated or ineffective, rather than the designated third-line treatment for refractory status epilepticus after *failure* of second-line therapy. - The critical step after failure of second-line AEDs is escalation to inducing **general anaesthesia** to stop persistent seizure activity. *Intravenous magnesium sulphate* - **Magnesium sulphate** is the specific first-line treatment for seizures occurring in the context of **eclampsia** or pre-eclampsia, which is not indicated in this non-pregnant patient. - It has no role in the standard emergency management protocol for **generalized tonic-clonic status epilepticus** in patients without eclampsia. *Oral carbamazepine via nasogastric tube* - **Oral medications** are inappropriate for terminating acute **status epilepticus** due to their inherently **slow absorption** and delayed onset of action, making them ineffective in an acute life-threatening situation. - **Carbamazepine** is used for the long-term management of epilepsy, not for emergency seizure termination, as it would not achieve therapeutic levels rapidly enough. *Intravenous methylprednisolone* - **Methylprednisolone** is a corticosteroid primarily used for its anti-inflammatory and immunosuppressive effects, and it has **no direct anticonvulsant properties**. - It is not indicated for the immediate termination of **acute seizure activity** or **status epilepticus**, though it might be used to treat underlying inflammatory causes of epilepsy (e.g., autoimmune encephalitis) over a longer course.

Question 107: A 71-year-old man with type 2 diabetes presents with sudden onset right homonymous hemianopia but no motor weakness. CT head shows a left occipital infarct. Which vascular territory is most likely affected?

A. Posterior cerebral artery (Correct Answer)
B. Middle cerebral artery
C. Anterior cerebral artery
D. Posterior inferior cerebellar artery
E. Anterior choroidal artery

Explanation: ***Posterior cerebral artery***- The **posterior cerebral artery (PCA)** supplies the **occipital lobe**, and an infarct here typically results in a **contralateral homonymous hemianopia** often with **macular sparing** if the middle cerebral artery provides collateral supply.- The absence of **motor weakness** is a classic sign of an isolated PCA stroke, as it spares the motor tracts of the internal capsule and frontal lobes.*Middle cerebral artery*- An infarct in the **middle cerebral artery (MCA)** territory usually presents with **contralateral hemiparesis** and **hemisensory loss**, primarily affecting the face and arm.- While it can cause homonymous hemianopia, it is almost always accompanied by **neurological deficits** such as **aphasia** (dominant) or **hemispatial neglect** (non-dominant).*Anterior cerebral artery*- The **anterior cerebral artery (ACA)** supplies the **medial portion** of the frontal and parietal lobes.- Clinical presentation typically involves **contralateral lower limb weakness** and sensory loss, rather than primary visual field defects.*Posterior inferior cerebellar artery*- Infarction of the **posterior inferior cerebellar artery (PICA)** leads to **Lateral Medullary Syndrome** (Wallenberg syndrome).- It is characterized by **ataxia**, **vertigo**, and **ipsilateral facial sensory loss**, but does not cause a homonymous hemianopia.*Anterior choroidal artery*- The **anterior choroidal artery** supplies the **posterior limb of the internal capsule**, which would typically lead to **hemiparesis** and hemisensory loss.- While it can cause visual field defects by affecting the **optic tract** or lateral geniculate nucleus, isolated occipital findings on CT points directly to the PCA.

Question 108: A 34-year-old woman with generalised epilepsy controlled on sodium valproate 1000mg twice daily is planning pregnancy. She had her last seizure 4 years ago. What is the most appropriate adjustment to her antiepileptic medication?

A. Switch to lamotrigine monotherapy with gradual dose titration (Correct Answer)
B. Continue sodium valproate but reduce dose to 500mg twice daily
C. Add folic acid 5mg daily and continue current medication
D. Switch to levetiracetam immediately and stop sodium valproate
E. Stop all antiepileptic drugs as she has been seizure-free for 4 years

Explanation: ***Switch to lamotrigine monotherapy with gradual dose titration*** - **Sodium valproate** is highly teratogenic, associated with a 10% risk of **major congenital malformations** and a 30-40% risk of **neurodevelopmental delay**; it must be avoided in women of childbearing potential. - **Lamotrigine** or **levetiracetam** are the preferred alternatives in pregnancy due to their lower teratogenic profile, provided they are introduced with **gradual titration** to maintain seizure control during the transition. *Continue sodium valproate but reduce dose to 500mg twice daily* - Even at lower doses, **valproate** remains significantly more teratogenic than other AEDs, and there is no "safe" dose for the developing fetus. - Current guidelines state that valproate should only be used if there is no other effective treatment, which is not evidenced here as a **switch** has not been attempted. *Add folic acid 5mg daily and continue current medication* - While **high-dose folic acid (5mg)** is mandatory for all women on AEDs to reduce **neural tube defect** risk, it does not mitigate the high neurodevelopmental risks specifically linked to **valproate**. - Continuing valproate when safer options exist violates the **Valproate Pregnancy Prevention Programme** (Prevent) regulations. *Switch to levetiracetam immediately and stop sodium valproate* - An **abrupt switch** or sudden cessation of valproate carries a high risk of **breakthrough seizures** and potentially **status epilepticus**, which poses a risk to both the mother and a future fetus. - Medications should be cross-tapered gradually to ensure **therapeutic levels** are maintained throughout the transition process. *Stop all antiepileptic drugs as she has been seizure-free for 4 years* - While she has been seizure-free, the physiological changes in pregnancy (such as increased **plasma volume** and stress) can lower the **seizure threshold**. - Decisions to stop AEDs should be made well in advance of pregnancy with specialist guidance; stopping now without a safety net risks **seizure recurrence** during a high-risk period.

Question 109: A 68-year-old woman with atrial fibrillation presents to the Emergency Department 3 hours after sudden onset left-sided weakness and dysphasia. CT head shows no haemorrhage. Her NIHSS score is 14. She takes warfarin and her INR is 3.2. Blood pressure is 165/95 mmHg. What is the most appropriate immediate management to enable thrombolysis?

A. Administer intravenous prothrombin complex concentrate (Correct Answer)
B. Give oral vitamin K 10mg and wait 6 hours
C. Give fresh frozen plasma immediately
D. Wait for INR to fall to <1.7 naturally before considering thrombolysis
E. Proceed directly with alteplase as she is within the time window

Explanation: ***Administer intravenous prothrombin complex concentrate***- Rapid reversal of **anticoagulation** is essential because an **INR >1.7** is a contraindication for thrombolysis in acute ischemic stroke.- **Prothrombin complex concentrate (PCC)** is the preferred agent as it provides immediate replacement of **clotting factors** (II, VII, IX, X) compared to other methods.*Give oral vitamin K 10mg and wait 6 hours*- **Vitamin K** takes several hours to synthesize new clotting factors, which is far too slow for the **4.5-hour thrombolysis window**.- While vitamin K is often given alongside PCC for sustained reversal, it cannot be used as a **monotherapy** in an emergency setting.*Give fresh frozen plasma immediately*- **Fresh frozen plasma (FFP)** requires large volumes and blood group matching, which causes significant delays in the **hyperacute** setting.- It is less effective and carries a higher risk of **fluid overload** compared to the more concentrated and faster-acting **PCC**.*Wait for INR to fall to <1.7 naturally before considering thrombolysis*- The **half-life** of warfarin effects (especially factor II and X) is too long for the INR to normalize within the narrow **thrombolytic window**.- Delaying treatment would lead to **exceeding the 4.5-hour time limit**, resulting in irreversible brain tissue loss and permanent **neurological deficit**.*Proceed directly with alteplase as she is within the time window*- Administering **alteplase** when the INR is above 1.7 carries a high risk of **symptomatic intracranial hemorrhage**.- This approach violates standard **safety guidelines**; the INR must be corrected to **<1.7** before thrombolytic therapy can safely commence.

Question 110: A 52-year-old man with a history of chronic migraine presents to the neurology clinic having tried multiple preventive treatments without success. He experiences 12-15 headache days per month, of which 10 are migrainous. He has tried and failed adequate trials of propranolol, topiramate, and amitriptyline. He is considerably disabled by his headaches and has had to reduce his working hours. He does not overuse acute medications. Which treatment option would be most appropriate to consider next according to NICE guidance?

A. Combination therapy with propranolol and topiramate
B. Greater occipital nerve blocks with corticosteroid and local anaesthetic
C. CGRP monoclonal antibody therapy (erenumab, fremanezumab, or galcanezumab)
D. Sodium valproate 500 mg twice daily
E. Botulinum toxin type A injections (Correct Answer)

Explanation: ***Botulinum toxin type A injections***- According to **NICE guidelines**, this is the recommended next step for patients with **chronic migraine** (≥15 headache days/month, of which 8 or more are migrainous) who have failed at least **three prior pharmacological preventives**.- The patient meets these criteria, including not having **medication overuse headache**, making botulinum toxin A the appropriate specific intervention for this clinical profile.*Combination therapy with propranolol and topiramate*- There is limited clinical evidence to support the **combination of two failed oral preventives** over switching to advanced therapies in chronic migraine.- **NICE guidance** prioritizes escalating to specialized treatments like Botulinum toxin type A rather than cycling through combinations of previously ineffective oral agents for refractory chronic migraine.*Greater occipital nerve blocks with corticosteroid and local anaesthetic*- While these may be used for **short-term relief** or as a bridge therapy, they are not typically recommended by **NICE** as a standard long-term **preventive strategy** for chronic migraine in this context.- They are more commonly utilized in the management of **cluster headaches**, specific neuralgias, or for acute exacerbations rather than as a primary long-term preventive for refractory chronic migraine after multiple drug failures.*CGRP monoclonal antibody therapy (erenumab, fremanezumab, or galcanezumab)*- Although these are indicated for chronic migraine after 3 drug failures, in the UK, they are traditionally positioned by **NICE technology appraisals** as an alternative or subsequent option to **Botulinum toxin type A**, depending on local commissioning policies and patient preference.- For this specific patient scenario with refractory chronic migraine after three oral preventives, **Botulinum toxin type A** is generally the established first-line injectable treatment in the pathway.*Sodium valproate 500 mg twice daily*- **Sodium valproate** is not recommended by **NICE** as a routine preventive treatment for migraine due to its side-effect profile, particularly **teratogenicity**, and the availability of more effective licensed alternatives.- Its use is strictly regulated, especially in patients of **childbearing potential**, and it does not precede specialized injectable therapies like Botulinum toxin type A in the current treatment algorithm.

Question 111: A 23-year-old woman presents to the Emergency Department following a witnessed seizure at work. Her colleague describes that she suddenly stopped talking mid-conversation, stared blankly ahead for about 30 seconds while smacking her lips, then seemed confused for a few minutes afterwards. She has no memory of the event. She has never had a seizure before and has no significant medical history. Neurological examination is now normal. What type of seizure has she most likely experienced?

A. Generalised tonic-clonic seizure
B. Absence seizure
C. Focal seizure with impaired awareness (Correct Answer)
D. Myoclonic seizure
E. Atonic seizure

Explanation: ***Focal seizure with impaired awareness***- The sudden cessation of activity, blank stare, **lip smacking (automatism)**, 30-second duration, and subsequent **post-ictal confusion** with **amnesia** are classic features.- These events arise from a specific brain area, most commonly the **temporal lobe**, and involve a transient alteration or loss of consciousness. *Generalised tonic-clonic seizure*- These seizures involve an initial **tonic phase** (stiffening) followed by a **clonic phase** (rhythmic jerking) of all extremities.- They are characterized by a complete **loss of consciousness** and often result in injury, **tongue biting**, or incontinence, none of which were described. *Absence seizure*- Characterized by very brief episodes (typically 5-10 seconds) of **staring blankly** without automatisms, followed by immediate and full recovery.- These usually occur without **post-ictal confusion** or the complex motor automatisms like lip smacking observed in the patient. *Myoclonic seizure*- These are sudden, brief, shock-like **muscle jerks** that can affect one part of the body or be generalized.- They do not typically involve a **prolonged staring spell**, **impaired awareness**, or significant **post-ictal confusion**. *Atonic seizure*- Also known as "drop attacks," these involve an abrupt, sudden **loss of muscle tone**, causing the person to fall to the ground.- They do not present with **automatisms**, a prolonged staring period, or the post-ictal confusion described in this case.

Question 112: Which clinical feature is part of the diagnostic criteria for dementia with Lewy bodies but NOT typically seen in early Alzheimer's disease?

A. Progressive episodic memory impairment
B. Recurrent complex visual hallucinations (Correct Answer)
C. Language dysfunction and word-finding difficulties
D. Impaired visuospatial skills
E. Difficulty with executive functions

Explanation: ***Recurrent complex visual hallucinations***- These are a **core clinical feature** of Dementia with Lewy Bodies (DLB), typically described as well-formed, detailed, and appearing early in the disease process.- In contrast, visual hallucinations are usually a **late-stage manifestation** in Alzheimer’s Disease and are not part of its early diagnostic profile.*Progressive episodic memory impairment*- This is the **hallmark presenting symptom** of early Alzheimer’s disease due to early involvement of the **hippocampus**.- While memory loss occurs in DLB, it is often less prominent initially than **deficits in attention** or executive function.*Language dysfunction and word-finding difficulties*- These features, often referred to as **aphasia**, are common early markers of Alzheimer's disease as the pathology spreads to cortical areas.- While language may be affected in DLB, it is not a **discriminating core feature** used to differentiate it from other dementias.*Impaired visuospatial skills*- Visuospatial deficits occur in both conditions, but they tend to be **disproportionately severe** and earlier in DLB compared to early Alzheimer's.- Because this feature overlaps significantly in both diseases, it is not a reliable exclusive **diagnostic differentiator** for DLB over Alzheimer's.*Difficulty with executive functions*- Executive dysfunction (e.g., poor planning or multitasking) is a **non-specific finding** that can be seen in both DLB and Alzheimer's disease.- In DLB, these deficits are linked to **fluctuating cognition**, but they do not provide the specific diagnostic clarity that **hallucinations** offer.

Question 113: What is the mechanism of action of alteplase in acute ischaemic stroke?

A. Directly inhibits platelet aggregation by blocking ADP receptors
B. Blocks glycoprotein IIb/IIIa receptors on platelets
C. Converts plasminogen to plasmin leading to fibrinolysis (Correct Answer)
D. Inhibits thrombin and prevents fibrin formation
E. Inhibits factor Xa in the coagulation cascade

Explanation: ***Converts plasminogen to plasmin leading to fibrinolysis*** - **Alteplase** is a recombinant **tissue plasminogen activator (tPA)** that restores blood flow by enzymatically dissolving existing thrombi. - It specifically catalyzes the conversion of **plasminogen** to **plasmin**, the enzyme responsible for degrading the **fibrin** meshwork of a clot, leading to **fibrinolysis**. *Directly inhibits platelet aggregation by blocking ADP receptors* - This mechanism describes **P2Y12 inhibitors** like **clopidogrel**, **prasugrel**, or **ticagrelor**. - These agents are **antiplatelet** drugs, primarily used to prevent new clot formation or growth, not to dissolve an established **fibrin clot** in acute stroke. *Blocks glycoprotein IIb/IIIa receptors on platelets* - This is the mechanism of action for **glycoprotein IIb/IIIa inhibitors** such as **abciximab**, **eptifibatide**, and **tirofiban**. - These drugs prevent the final common pathway of **platelet aggregation** by blocking the binding of **fibrinogen**, but they do not directly break down existing **fibrin clots**. *Inhibits thrombin and prevents fibrin formation* - This mechanism is characteristic of **anticoagulants** like **direct thrombin inhibitors** (e.g., **dabigatran**, argatroban) or the indirect action of **heparin** through **antithrombin**. - These agents are used to prevent new clot formation or propagation, but they are not **thrombolytics** designed to dissolve an existing **ischaemic stroke** clot. *Inhibits factor Xa in the coagulation cascade* - This is the primary mechanism for **direct oral anticoagulants (DOACs)** such as **rivaroxaban** and **apixaban**. - While they interfere with the **coagulation cascade** to prevent clot formation, they do not possess the **fibrinolytic** properties required for acute **reperfusion** in ischaemic stroke.

Question 114: A 67-year-old woman diagnosed with vascular dementia 2 years ago presents with her daughter who is concerned about capacity to manage finances. The patient has been making unusual purchases and has forgotten to pay bills. MMSE score is 20/30. She understands that she has memory problems but insists she can manage her money independently. She can describe what bills need to be paid but has repeatedly forgotten to pay them. What is the most appropriate approach to capacity assessment for financial decisions?

A. She lacks capacity as she has a diagnosis of dementia and MMSE <24/30
B. She has capacity as she can describe what needs to be done even though she forgets to do it
C. Capacity should be assessed specifically for the financial decisions in question using the two-stage test (Correct Answer)
D. Arrange formal neuropsychological testing before determining capacity
E. She lacks capacity because she has failed the functional test by not paying bills

Explanation: ***Capacity should be assessed specifically for the financial decisions in question using the two-stage test***- Capacity is **decision-specific** and **time-specific**; a diagnosis of vascular dementia does not automatically imply a lack of capacity for all tasks.- The **two-stage test** involves identifying an impairment of the mind and then determining if that impairment prevents the patient from understanding, retaining, weighing, or communicating information regarding that **specific decision**.*She lacks capacity as she has a diagnosis of dementia and MMSE <24/30*- A diagnosis of dementia or a specific **MMSE score** cannot be used to automatically assume a lack of capacity under the **Mental Capacity Act**.- Capacity must be presumed unless proven otherwise through a functional assessment, regardless of **cognitive screening** results.*She has capacity as she can describe what needs to be done even though she forgets to do it*- Being able to describe a task does not equate to having capacity if the patient cannot **retain** the information or **use/weigh** it to execute the decision.- Memory impairment that leads to a consistent failure to follow through on financial obligations may indicate a lack of the **retention** element of the functional test.*Arrange formal neuropsychological testing before determining capacity*- While **neuropsychological testing** provides detailed data on cognitive deficits, it is an adjunct and not a prerequisite for a clinical capacity assessment.- The legal assessment of capacity is a **clinical judgment** based on the functional test and does not require specialized formal testing in most routine cases.*She lacks capacity because she has failed the functional test by not paying bills*- Making "unwise decisions" or failing to perform a task (like paying bills) is not, by itself, evidence of a **lack of capacity**.- The assessment must determine if the **impairment of mind** (vascular dementia) is the direct cause of the inability to understand, retain, or weigh the specific information required to manage finances.

Question 115: A 42-year-old woman presents with right-sided weakness that developed over 20 minutes and has now completely resolved after 45 minutes. She has no past medical history and takes no regular medications. Examination is entirely normal. Blood pressure is 128/78 mmHg, heart rate is 72 bpm and regular. ECG shows sinus rhythm. Blood glucose is 5.4 mmol/L. She is a non-smoker with BMI of 24. According to current guidelines, what is the most appropriate acute management?

A. Reassure and arrange outpatient neurology review within 2 weeks
B. Aspirin 300 mg and clopidogrel 300 mg, then arrange CT head within 7 days
C. Admit for observation and start aspirin only after CT excludes haemorrhage
D. Aspirin 300 mg immediately and arrange urgent specialist assessment within 24 hours (Correct Answer)
E. Start aspirin 75 mg and arrange MRI brain as an outpatient

Explanation: ***Aspirin 300 mg immediately and arrange urgent specialist assessment within 24 hours***- This presentation is highly suggestive of a **Transient Ischaemic Attack (TIA)**, which requires immediate antiplatelet therapy. NICE guidelines recommend **aspirin 300 mg** stat for suspected TIA to reduce immediate stroke risk.- **Urgent specialist assessment** within **24 hours** is crucial for further risk stratification (e.g., ABCD2 score), investigation (e.g., carotid Doppler, brain imaging), and initiation of long-term secondary prevention.*Reassure and arrange outpatient neurology review within 2 weeks*- Reassurance is inappropriate given the significant **short-term stroke risk** following a TIA, especially within the first 48 hours.- Waiting **two weeks** for neurological review is dangerously delayed; guidelines mandate assessment within 24 hours for most TIAs.*Aspirin 300 mg and clopidogrel 300 mg, then arrange CT head within 7 days*- While **dual antiplatelet therapy (DAPT)** with aspirin and clopidogrel can be used after TIA, it's typically initiated after **specialist assessment** and confirmation of diagnosis, not as an initial emergency step before any imaging.- Waiting **7 days for a CT head** is too long; brain imaging (CT or MRI) and carotid imaging are required much sooner to identify the cause and guide further management.*Admit for observation and start aspirin only after CT excludes haemorrhage*- For suspected TIA, **aspirin** should be started immediately based on clinical grounds, without waiting for a CT scan to exclude haemorrhage, unless there are atypical features suggesting haemorrhage. The risk of delay outweighs the very low risk of haemorrhage in a TIA.- Formal **admission** is not universally required for all TIAs, especially those with low ABCD2 scores, but urgent assessment remains paramount.*Start aspirin 75 mg and arrange MRI brain as an outpatient*- The acute loading dose for aspirin in suspected TIA is **300 mg**, not the lower 75 mg maintenance dose, which would be insufficient for immediate antiplatelet effect.- Relying solely on an **outpatient MRI** without immediate clinical assessment and initiation of acute management delays critical intervention during the period of highest stroke risk.

Question 116: A 75-year-old man with Alzheimer's dementia (MMSE 18/30) is reviewed in the memory clinic. He was started on donepezil 6 months ago with some initial improvement, but his wife reports worsening confusion, nocturnal wandering, and verbal aggression over the past 4 weeks. He has developed visual hallucinations of insects on the walls. There is no evidence of infection or other physical illness. His medications include donepezil, amlodipine, and atorvastatin. What is the most appropriate initial management of his behavioural symptoms?

A. Add memantine to existing donepezil therapy
B. Add low-dose risperidone 0.5 mg twice daily
C. Switch from donepezil to memantine
D. Implement non-pharmacological interventions and review in 2 weeks (Correct Answer)
E. Stop donepezil and start quetiapine 25 mg at night

Explanation: ***Implement non-pharmacological interventions and review in 2 weeks***- According to **NICE guidelines**, non-pharmacological approaches are the **first-line management** for **Behavioural and Psychological Symptoms of Dementia (BPSD)** unless there is severe distress or immediate risk of harm.- These interventions include identifying triggers, **environmental modifications**, and ensuring sensory needs are met before considering pharmacological changes. *Add memantine to existing donepezil therapy* - While **memantine** is indicated for moderate-to-severe Alzheimer's (MMSE < 20), it is not the initial treatment for acute **behavioural symptoms** like aggression or hallucinations. - It is typically considered as an add-on therapy to address cognitive decline when non-pharmacological methods and primary cognitive enhancers are insufficient for the broader disease progression. *Add low-dose risperidone 0.5 mg twice daily* - **Antipsychotics** like risperidone should only be used as a last resort for BPSD, particularly if there is an immediate risk of harm or extreme distress, due to the significant risk of **stroke** and increased **mortality** in elderly patients with dementia. - If used, they must be prescribed at the **lowest effective dose** for the shortest possible duration, and only after non-pharmacological options have been exhausted. *Switch from donepezil to memantine* - There is no clinical indication to discontinue **donepezil** solely because behavioral symptoms have emerged; cholinesterase inhibitors should generally be continued unless side effects warrant cessation. - **Dual therapy** (cholinesterase inhibitor plus NMDA antagonist) is often preferred over switching when dementia progresses to the moderate stage, rather than stopping one for the other. *Stop donepezil and start quetiapine 25 mg at night* - **Quetiapine** has limited robust evidence of efficacy for BPSD and carries similar risks of **cerebrovascular events** and **increased mortality** as other antipsychotics in this population. - Abruptly stopping **donepezil** can lead to a rapid worsening of cognitive function and potentially exacerbate behavioural instability, which is generally not recommended.

Question 117: A 58-year-old man presents to the Emergency Department with sudden onset severe occipital headache that he describes as 'the worst headache of his life'. The headache started 6 hours ago while he was lifting weights at the gym. He has vomited twice and is photophobic. He is alert and oriented. Neurological examination is normal. Blood pressure is 158/92 mmHg. Non-contrast CT head performed 8 hours after symptom onset shows no abnormality. What is the most appropriate next investigation?

A. Discharge with analgesia and GP follow-up as CT is normal
B. Lumbar puncture with spectrophotometry for xanthochromia (Correct Answer)
C. CT angiography of cerebral vessels
D. MRI brain with gadolinium contrast
E. Repeat CT head after 24 hours

Explanation: ***Lumbar puncture with spectrophotometry for xanthochromia***- In a patient with a **thunderclap headache** and a negative CT performed more than 6 hours after onset, **lumbar puncture** is mandatory to rule out subarachnoid hemorrhage (SAH).- **Xanthochromia** usually takes at least **12 hours** to develop as red blood cells break down into bilirubin; spectrophotometry is the gold standard for detection.*Discharge with analgesia and GP follow-up as CT is normal*- A normal CT scan does not exclude SAH, especially if clinical suspicion is high based on a **sudden-onset severe headache**.- Premature discharge without excluding a **sentinel bleed** carries a high risk of catastrophic re-bleeding or death.*CT angiography of cerebral vessels*- While **CT angiography** can identify vascular abnormalities like aneurysms, it is not a diagnostic tool for confirming the presence of **subarachnoid blood**.- A positive CTA without evidence of hemorrhage does not confirm SAH, and a negative CTA cannot definitively rule out a small bleed.*MRI brain with gadolinium contrast*- **MRI** is generally less sensitive than CT for detecting acute blood in the first 24 hours and is not the first-line investigation for suspected **acute SAH**.- Contrast-enhanced MRI is better suited for identifying **malignancies or infections** rather than acute subarachnoid bleeding.*Repeat CT head after 24 hours*- The sensitivity of a CT scan for SAH **decreases with time** as blood is washed away or degraded; repeating it later is unlikely to show blood if the first was clear.- **Lumbar puncture** is the definitive step when the initial CT is negative to avoid missing a diagnosis that requires urgent neurosurgical intervention.

Question 118: A 32-year-old woman with a 10-year history of epilepsy controlled on levetiracetam presents to the neurology clinic. She has been seizure-free for 5 years and asks about stopping her medication. Her epilepsy began in her early twenties with generalised tonic-clonic seizures. EEG performed at diagnosis showed generalised spike-and-wave discharges. She drives and works as a primary school teacher. What is the most appropriate advice regarding antiepileptic drug withdrawal?

A. Withdrawal can be considered; the process should take at least 2-3 months and she must inform the DVLA and stop driving during withdrawal and for 6 months after (Correct Answer)
B. Withdrawal is appropriate; she can continue driving as she has been seizure-free for 5 years
C. Withdrawal should not be considered as she has generalised epilepsy with ongoing EEG abnormalities
D. Withdrawal can be attempted; she should reduce the dose by 25% every 2 weeks and can continue driving if no seizures occur
E. She should have a repeat EEG, and withdrawal can only proceed if this is normal

Explanation: ***Withdrawal can be considered; the process should take at least 2-3 months and she must inform the DVLA and stop driving during withdrawal and for 6 months after***- NICE guidelines suggest considering **antiepileptic drug (AED) withdrawal** after **2 years or more of seizure freedom**, which this patient meets (5 years). The process should be **gradual**, typically over **2-3 months** or longer to minimize recurrence risk.- **Driving regulations (DVLA in the UK)** require patients to **inform the DVLA** and **stop driving** during the entire withdrawal period and for **6 months after** the last dose, irrespective of seizure occurrence, due to the elevated risk of provoked seizures.*Withdrawal is appropriate; she can continue driving as she has been seizure-free for 5 years*- While **seizure freedom for 5 years** makes withdrawal *appropriate to consider*, continuing to drive during withdrawal is **not permissible** under driving regulations.- The act of **reducing AEDs** significantly increases the risk of **provoked seizures**, making driving unsafe and illegal until a sustained seizure-free period after withdrawal is confirmed.*Withdrawal should not be considered as she has generalised epilepsy with ongoing EEG abnormalities*- Although **generalised epilepsy** and **spike-and-wave discharges on EEG** (even if from diagnosis) are risk factors for recurrence, they do not **absolutely contraindicate** a supervised withdrawal attempt, especially after **5 years of seizure freedom**.- The decision to withdraw is a **shared process** considering individual risk factors, lifestyle, and the patient's strong desire to stop medication.*Withdrawal can be attempted; she should reduce the dose by 25% every 2 weeks and can continue driving if no seizures occur*- A **25% reduction every 2 weeks** is often considered too rapid for most AEDs and increases the risk of **withdrawal seizures**; a more gradual taper over **2-3 months** or longer is generally recommended.- The **DVLA requirement to stop driving** during and for 6 months post-withdrawal is **mandatory**, irrespective of whether seizures occur, as the increased risk is inherent to the process.*She should have a repeat EEG, and withdrawal can only proceed if this is normal*- While a **repeat EEG** can provide additional prognostic information regarding recurrence risk, a **normal EEG is not a mandatory prerequisite** for initiating AED withdrawal.- Many patients who are clinically **seizure-free** may still have **interictal epileptiform discharges** on EEG and can successfully withdraw from medication under supervision.

Question 119: A 64-year-old woman presents with sudden onset vertigo, vomiting, and difficulty walking that started 4 hours ago. She has a past medical history of hypertension and hyperlipidaemia. On examination, she has nystagmus, left-sided limb ataxia, and difficulty maintaining balance. There is also reduced pain and temperature sensation on the right side of her face and left side of her body. Her blood pressure is 172/98 mmHg. What vascular territory is most likely affected?

A. Left posterior inferior cerebellar artery (Correct Answer)
B. Right middle cerebral artery
C. Left anterior inferior cerebellar artery
D. Basilar artery
E. Right posterior inferior cerebellar artery

Explanation: ***Left posterior inferior cerebellar artery*** - This patient presents with **Wallenberg syndrome** (lateral medullary syndrome), which results from an infarct in the territory of the **Posterior Inferior Cerebellar Artery (PICA)**. - The combination of **ipsilateral limb ataxia** (left) and **crossed sensory loss** (reduced pain/temperature on the ipsilateral face (right) and contralateral body (left)) localizes the lesion precisely to the **left lateral medulla**, supplied by the left PICA. *Right middle cerebral artery* - An MCA stroke typically presents with **contralateral hemiparesis**, hemisensory loss, and potentially **aphasia** or neglect, rather than cerebellar signs. - It does not cause the **crossed sensory deficits** or the distinct brainstem findings (vertigo, vomiting, nystagmus) seen in this case. *Left anterior inferior cerebellar artery* - **AICA** occlusion leads to **lateral pontine syndrome**, which is distinguished from PICA syndrome by the presence of **ipsilateral facial paralysis** (CN VII) and **deafness** or tinnitus (CN VIII). - Since these cranial nerve VII and VIII signs are absent, a pontine lesion is less likely than a medullary one. *Basilar artery* - **Basilar artery** occlusion usually presents with more severe, global symptoms such as **bilateral motor deficits** (quadriparesis) or a **locked-in syndrome**. - It often involves significant alterations in **level of consciousness** and lacks the specific isolated lateralizing signs of Wallenberg syndrome. *Right posterior inferior cerebellar artery* - While a PICA lesion causes Wallenberg syndrome, a **right PICA infarction** would lead to **right-sided cerebellar ataxia** and **right-sided facial sensory loss**. - Because this patient has **left-sided limb ataxia** and **left-sided body sensory loss**, the lesion must be located on the **left side** of the medulla.

Question 120: A 79-year-old man is admitted with acute confusion. His wife reports he was well until 2 days ago when he became increasingly drowsy and confused. He has a history of benign prostatic hyperplasia and recently started taking oxybutynin. On examination, he is disoriented to time and place, appears agitated, and is picking at the bed sheets. Temperature is 37.8°C, heart rate is 102 bpm, blood pressure is 138/82 mmHg. His abbreviated mental test score is 3/10. Blood tests show: Na+ 142 mmol/L, K+ 4.1 mmol/L, urea 8.2 mmol/L, creatinine 98 μmol/L, CRP 12 mg/L. Urinalysis shows leucocytes ++, nitrites +. What is the most likely diagnosis?

A. Alzheimer's disease with acute deterioration
B. Delirium secondary to urinary tract infection (Correct Answer)
C. Lewy body dementia
D. Hypoactive delirium due to anticholinergic medication
E. Uremic encephalopathy

Explanation: ***Delirium secondary to urinary tract infection*** - The patient's **acute onset** (2 days) of confusion, drowsiness, disorientation, and agitation (picking at bed sheets suggesting **hyperactive delirium**) are classic features of **delirium**. - The urinalysis showing **leucocytes ++** and **nitrites +**, along with a low-grade fever (37.8°C) and elevated CRP, strongly indicates a **urinary tract infection (UTI)** as the precipitating cause. *Alzheimer's disease with acute deterioration* - **Alzheimer's disease** is characterized by a **gradual, progressive decline** in cognitive function over months to years, not a sudden onset over 2 days. - While patients with **dementia** are more susceptible to delirium, the acute change in mental status and clear signs of infection point to delirium as the primary diagnosis. *Lewy body dementia* - **Lewy body dementia** typically presents with fluctuating cognition, **recurrent visual hallucinations**, and **Parkinsonian features**, which are chronic and not consistent with a 2-day acute decline. - The presence of a clear **infection (UTI)** better explains the acute cognitive decline than a new diagnosis of Lewy body dementia. *Hypoactive delirium due to anticholinergic medication* - While **oxybutynin** is an anticholinergic medication and can contribute to confusion, the patient is described as **agitated** and picking at bed sheets, which are features of **hyperactive delirium**, not hypoactive. - The strong evidence of a **UTI** (leucocytes, nitrites, fever, CRP) provides a more direct and acute cause for the delirium than medication alone. *Uremic encephalopathy* - **Uremic encephalopathy** is caused by severe kidney dysfunction leading to accumulation of uremic toxins, typically associated with significantly elevated **urea and creatinine** levels. - The patient's **creatinine (98 μmol/L)** and **urea (8.2 mmol/L)** are within or only very mildly elevated from the normal range for an elderly person, making uremic encephalopathy an unlikely cause.

Question 121: A 55-year-old woman presents to her GP with episodes of severe unilateral headache occurring 2-3 times per week for the past 2 months. Each episode lasts 1-2 hours and is associated with nausea, photophobia, and phonophobia. She describes the pain as throbbing and affecting the right side of her head. She has noticed that the headaches are sometimes preceded by 20 minutes of shimmering zigzag lines in her vision. Between episodes she feels well. What is the most appropriate first-line prophylactic medication?

A. Propranolol 80 mg twice daily (Correct Answer)
B. Amitriptyline 10 mg at night, gradually increasing to 50-75 mg
C. Topiramate 25 mg daily, gradually increasing to 50-100 mg
D. Pizotifen 0.5 mg at night, gradually increasing to 1.5 mg
E. Flunarizine 10 mg at night

Explanation: ***Propranolol 80 mg twice daily*** - The clinical presentation of **unilateral throbbing headache**, nausea, and **visual aura** (shimmering zigzag lines) confirms a diagnosis of **migraine with aura**. - NICE guidelines recommend **Propranolol** as a **first-line prophylactic** agent for patients experiencing two or more attacks per month that impact quality of life. *Amitriptyline 10 mg at night, gradually increasing to 50-75 mg* - While effective for **neuropathic pain** and migraine prevention, it is generally considered an **alternative** or second-line option rather than the first-line choice. - It is frequently associated with **anticholinergic side effects** such as dry mouth and sedation, making it less favorable than beta-blockers initially. *Topiramate 25 mg daily, gradually increasing to 50-100 mg* - Though a **first-line** prophylactic option, it is often avoided as the initial choice in women of childbearing age due to its **teratogenic risk**. - It requires cautious use due to potential **cognitive side effects** (difficulty concentrating) and the risk of **secondary glaucoma**. *Pizotifen 0.5 mg at night, gradually increasing to 1.5 mg* - Pizotifen is rarely used as a first-line treatment in modern practice due to limited efficacy compared to modern agents. - It is strongly associated with undesirable side effects, most notably **significant weight gain** and marked **drowsiness**. *Flunarizine 10 mg at night* - This is usually reserved as a **third-line** or specialist-initiated treatment for refractory migraine cases. - It is not routinely available in many primary care settings and carries a risk of **extrapyramidal side effects** and depression.

Question 122: A 28-year-old man is brought to the Emergency Department by ambulance following a witnessed generalised tonic-clonic seizure lasting approximately 3 minutes. He has now been seizing continuously for 20 minutes despite two doses of intravenous lorazepam 4 mg given 10 minutes apart. His airway is maintained, oxygen saturation is 94% on high-flow oxygen, heart rate is 118 bpm, blood pressure is 142/88 mmHg, and blood glucose is 6.2 mmol/L. What is the most appropriate next step in management?

A. Administer intravenous phenytoin 15-18 mg/kg at maximum rate of 50 mg/min (Correct Answer)
B. Give a third dose of intravenous lorazepam 4 mg
C. Arrange urgent transfer to intensive care for intubation
D. Administer intramuscular paraldehyde 0.4 ml/kg
E. Give intravenous levetiracetam 40 mg/kg over 5 minutes

Explanation: ***Administer intravenous phenytoin 15-18 mg/kg at maximum rate of 50 mg/min*** - This patient is in **established status epilepticus**, as the seizure has continued for 20 minutes despite two adequate doses of **benzodiazepines** (lorazepam). - **Phenytoin** is a widely accepted and effective second-line antiepileptic drug for established status epilepticus, providing sustained seizure control. *Give a third dose of intravenous lorazepam 4 mg* - Administering a third dose of **benzodiazepines** is generally not recommended as it significantly increases the risk of **respiratory depression** and sedation. - Once two doses of a **first-line agent** like lorazepam have failed, the next step is to transition to a **second-line antiepileptic drug**. *Arrange urgent transfer to intensive care for intubation* - Intubation and general anesthesia are typically reserved for **refractory status epilepticus**, which is defined as seizures continuing despite adequate doses of both first- and second-line antiepileptic drugs. - While airway management is crucial, the immediate next step is to attempt to terminate the seizure pharmacologically with a **second-line agent** before escalating to general anesthesia. *Administer intramuscular paraldehyde 0.4 ml/kg* - **Paraldehyde** is an older antiepileptic agent rarely used in current practice due to its side effects, and is considered only when **intravenous access** is impossible. - This patient has already received IV lorazepam, indicating readily available IV access, making paraldehyde an inappropriate choice. *Give intravenous levetiracetam 40 mg/kg over 5 minutes* - While **levetiracetam** is an alternative second-line antiepileptic for status epilepticus, the standard recommended loading dose is typically higher, usually **60 mg/kg**. - **Phenytoin** remains a more traditionally established first choice in many acute protocols for established convulsive status epilepticus compared to levetiracetam at this suboptimal dose.

Question 123: A 68-year-old woman presents with a 6-month history of progressive memory impairment and visual hallucinations of children playing in her garden. Her husband reports marked fluctuation in her cognition, with some days much worse than others. She has developed a shuffling gait and has had two falls. There is no significant past medical history. MMSE score is 22/30. Examination reveals mild cogwheel rigidity and bradykinesia. MRI brain shows generalised atrophy with preserved hippocampal volumes. What is the most likely diagnosis?

A. Alzheimer's disease with Parkinsonian features
B. Dementia with Lewy bodies (Correct Answer)
C. Parkinson's disease with dementia
D. Vascular dementia with parkinsonism
E. Progressive supranuclear palsy

Explanation: ***Dementia with Lewy bodies*** - This patient presents with the classic triad of **fluctuating cognition**, detailed **visual hallucinations** (children playing), and spontaneous **parkinsonism** (shuffling gait, falls, cogwheel rigidity, bradykinesia). - The **preserved hippocampal volumes** on MRI, despite generalized atrophy, is a key feature differentiating it from Alzheimer's, and the presentation fits the 'one-year rule' where cognitive symptoms occur concurrently or within a year of motor symptoms. *Alzheimer's disease with Parkinsonian features* - While common, **Alzheimer's disease** typically presents with early, prominent episodic memory loss and would show **hippocampal atrophy** on MRI, which is absent here. - Vivid visual hallucinations and marked cognitive fluctuations are not characteristic early features of AD, distinguishing it from **Dementia with Lewy bodies**. *Parkinson's disease with dementia* - This diagnosis requires that **motor symptoms** (parkinsonism) must be present for at least **one year before** the onset of significant cognitive impairment or dementia. - In this case, memory impairment and visual hallucinations developed concurrently or shortly after the motor symptoms, making **Dementia with Lewy bodies** more likely. *Vascular dementia with parkinsonism* - Characterized by a **stepwise decline** in cognition and a history of vascular risk factors or strokes, rather than the prominent daily fluctuations seen here. - MRI would typically reveal specific **vascular lesions** like infarcts or significant white matter disease, not just generalized atrophy with preserved hippocampi. *Progressive supranuclear palsy* - Presents with early and prominent **falls** and axial rigidity, but a distinguishing feature is **vertical gaze palsy** (difficulty looking up or down), which is not mentioned. - The cognitive profile in PSP is often more subcortical, and vivid visual hallucinations are not a typical primary symptom as seen in DLB.

Question 124: A 45-year-old woman with known epilepsy presents to clinic requesting preconception counselling. She has been seizure-free for 3 years on sodium valproate 1000 mg twice daily. She has previously failed treatment with carbamazepine due to poor seizure control and levetiracetam due to intolerable mood disturbance. She is keen to start trying for pregnancy. What is the most appropriate management plan?

A. Continue sodium valproate with high-dose folic acid supplementation
B. Switch to lamotrigine with gradual dose titration before conception (Correct Answer)
C. Switch to phenytoin as it has lower teratogenic risk than valproate
D. Continue current medication but ensure she uses reliable contraception
E. Reduce sodium valproate dose to minimise teratogenic risk

Explanation: ***Switch to lamotrigine with gradual dose titration before conception***- **Sodium valproate** is highly **teratogenic**, associated with a **10% risk of major congenital malformations** and up to a **40% risk of neurodevelopmental delay**; it must be avoided in women of childbearing potential unless no alternative exists.- **Lamotrigine** is a preferred first-line option in pregnancy due to its **lowest risk profile**; given she failed levetiracetam, lamotrigine is the most appropriate next step to attempt before conception.*Continue sodium valproate with high-dose folic acid supplementation*- While **5mg folic acid** is mandatory for women on antiepileptics, it does not sufficiently mitigate the significant **teratogenic and neurodevelopmental risks** unique to valproate.- Guidelines and the **Valproate Pregnancy Prevention Programme** mandate shifting to safer alternatives whenever clinically possible.*Switch to phenytoin as it has lower teratogenic risk than valproate*- **Phenytoin** is also associated with significant teratogenicity, including the **fetal hydantoin syndrome**, and is generally avoided in pregnancy.- It is not a preferred alternative when modern options like **lamotrigine** have a much better-established safety profile for the fetus.*Continue current medication but ensure she uses reliable contraception*- This option ignores the patient's explicit request for **preconception counselling** and her desire to start trying for pregnancy.- Management must focus on optimizing her medication regimen to facilitate a **safe pregnancy** rather than simply preventing one.*Reduce sodium valproate dose to minimise teratogenic risk*- Although risks are dose-dependent (higher risk >1000mg/day), there is **no established "safe" dose** of valproate that eliminates the high risk of birth defects.- For a patient who is currently stable, the priority is to transition to a drug with **lower intrinsic teratogenicity** rather than sticking with a high-risk agent.

Question 125: A 72-year-old man presents to the Emergency Department with sudden onset right-sided weakness and speech difficulty that started 90 minutes ago. His blood pressure is 168/95 mmHg, heart rate is 88 bpm and irregularly irregular. He has a past medical history of hypertension and type 2 diabetes mellitus. Neurological examination reveals right-sided hemiparesis with facial droop, dysphasia, and right homonymous hemianopia. His NIHSS score is 16. Non-contrast CT head shows no evidence of haemorrhage or early ischaemic changes. What is the most appropriate immediate management?

A. Intravenous alteplase followed by mechanical thrombectomy (Correct Answer)
B. Aspirin 300 mg stat and admission to stroke unit
C. Mechanical thrombectomy alone without thrombolysis
D. Reduce blood pressure to target <140/90 mmHg before further intervention
E. CT angiography followed by deferred decision based on vessel occlusion site

Explanation: ***Intravenous alteplase followed by mechanical thrombectomy*** - The patient presents within the **4.5-hour window** for intravenous thrombolysis, and the non-contrast CT head **excludes haemorrhage**, making **alteplase** the immediate first-line treatment to improve clinical outcomes. - An **NIHSS score of 16** and clinical features like **right homonymous hemianopia** and severe hemiparesis strongly suggest a **large vessel occlusion (LVO)**, for which **mechanical thrombectomy** in conjunction with alteplase is the standard of care to achieve reperfusion. *Aspirin 300 mg stat and admission to stroke unit* - **Aspirin** is crucial for secondary prevention in ischaemic stroke but is typically deferred for **24 hours after intravenous thrombolysis** to minimize the risk of haemorrhagic transformation. - Administering aspirin alone would represent an under-treatment, as it would forgo the opportunity for **acute reperfusion therapies** (thrombolysis and thrombectomy) which are time-sensitive and more effective in reversing neurological deficits. *Mechanical thrombectomy alone without thrombolysis* - Current guidelines advocate for a "**bridging therapy**" approach, meaning patients eligible for both treatments should receive **intravenous alteplase** as soon as possible while preparing for mechanical thrombectomy. - Omitting thrombolysis without specific contraindications can delay reperfusion and miss the chance for earlier clot lysis, potentially worsening patient outcomes. *Reduce blood pressure to target <140/90 mmHg before further intervention* - Aggressive blood pressure lowering in the acute phase of ischaemic stroke can reduce **cerebral perfusion pressure** to the **ischaemic penumbra**, potentially worsening ischaemia and infarct size. - For patients eligible for thrombolysis, blood pressure needs to be maintained below **185/110 mmHg**; the patient's current BP of 168/95 mmHg is within the acceptable range and does not require immediate lowering prior to alteplase. *CT angiography followed by deferred decision based on vessel occlusion site* - While **CT angiography (CTA)** is essential to confirm a large vessel occlusion and guide mechanical thrombectomy, it should **not delay** the administration of **intravenous alteplase** in eligible patients. - The strategy is often "**drip and ship**" or "drip and scan," where alteplase is initiated immediately after non-contrast CT rules out haemorrhage, and CTA is performed either concurrently or subsequently to plan for thrombectomy.

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