Dementia and Cognitive Impairment Indian Medical PG Practice Questions and MCQs
Practice Indian Medical PG questions for Dementia and Cognitive Impairment. These multiple choice questions (MCQs) cover important concepts and help you prepare for your exams.
Dementia and Cognitive Impairment Indian Medical PG Question 1: Reversible dementia causes are all except-
- A. Subdural hematoma
- B. Myxedema
- C. Vitamin B12 deficiency
- D. Lewy body dementia (Correct Answer)
Dementia and Cognitive Impairment Explanation: ***Lewy body dementia***
- **Lewy body dementia** is a **progressive neurodegenerative disease**, characterized by the abnormal accumulation of alpha-synuclein proteins (Lewy bodies) in the brain.
- It is an **irreversible form of dementia**, meaning its cognitive decline cannot be halted or reversed.
*Subdural hematoma*
- A **subdural hematoma**, especially chronic, can cause **cognitive impairment** due to pressure on the brain [1].
- If diagnosed and treated early (e.g., surgical evacuation), the associated cognitive deficits can often be **reversed or significantly improved**.
*Myxedema*
- **Myxedema**, or severe hypothyroidism, can lead to **reversible cognitive dysfunction**, including memory impairment and slowed thinking.
- Treatment with **thyroid hormone replacement** can reverse the dementia-like symptoms.
*Vitamin B12 deficiency*
- **Vitamin B12 deficiency** can cause a range of neurological symptoms, including **cognitive decline** and dementia-like symptoms [1].
- With timely and adequate **vitamin B12 supplementation**, the associated cognitive impairment can often be **reversed** [1].
Dementia and Cognitive Impairment Indian Medical PG Question 2: Global cerebral dysfunction characterised by alteration in cognitive function and consciousness is known as
- A. Delirium (Correct Answer)
- B. Dementia
- C. Depression
- D. Acute anxiety
Dementia and Cognitive Impairment Explanation: ***Delirium***
- Delirium is characterized by an **acute onset** of global cerebral dysfunction, marked by fluctuations in **attention, consciousness, and cognition**.
- It is a medical emergency that can be caused by various underlying medical conditions, medications, or substance withdrawal.
*Dementia*
- Dementia is a **chronic** and progressive decline in cognitive function, primarily affecting **memory, language, and problem-solving abilities**, without a primary disturbance of consciousness.
- While it involves cognitive impairment, its onset is typically gradual, and it lacks the acute fluctuations and prominent consciousness alterations seen in delirium.
*Depression*
- Depression is a **mood disorder** characterized by persistent sadness, loss of interest, and other emotional and physical symptoms, which can affect concentration and memory.
- It does not involve a primary alteration in consciousness or the acute, global cognitive dysfunction characteristic of delirium.
*Acute anxiety*
- Acute anxiety is a state of intense fear or uneasiness, often accompanied by physical symptoms like palpitations and shortness of breath.
- While it can interfere with focus and concentration, it does not represent a global cerebral dysfunction or an alteration in consciousness in the way that delirium does.
Dementia and Cognitive Impairment Indian Medical PG Question 3: Which of the following is the most appropriate treatment for an overactive bladder in a patient with dementia?
- A. Tolterodine (Correct Answer)
- B. Mirabegron
- C. Behavioral therapy/bladder training
- D. Oxybutynin
- E. Trospium
Dementia and Cognitive Impairment Explanation: ***Tolterodine***
- **Tolterodine** is a **muscarinic antagonist** that blocks acetylcholine receptors in the bladder, reducing detrusor muscle contractions and overactive bladder symptoms.
- Unlike some other anticholinergics like oxybutynin, it has a **lower propensity to cross the blood-brain barrier** and thus a reduced risk of exacerbating cognitive impairment in patients with dementia.
*Mirabegron*
- **Mirabegron** is a **beta-3 adrenergic agonist** that relaxes the detrusor muscle, increasing bladder capacity.
- While it has a different mechanism of action and is less likely to cause anticholinergic cognitive side effects than older anticholinergics, it can still cause **hypertension** and **tachycardia**, which may be problematic in elderly patients with comorbidities.
*Behavioral therapy/bladder training*
- **Behavioral therapy** and **bladder training** are important first-line treatments for overactive bladder.
- However, for patients with **dementia**, cognitive impairment often makes adherence to and understanding of these complex therapies challenging or impossible without significant caregiver support.
*Oxybutynin*
- **Oxybutynin** is an **anticholinergic drug** that is effective for overactive bladder.
- However, it has a **high affinity for muscarinic receptors** in the brain and readily crosses the blood-brain barrier, significantly increasing the risk of **cognitive impairment, confusion, and delirium** in elderly patients, especially those with pre-existing dementia.
*Trospium*
- **Trospium** is a **quaternary amine anticholinergic** that is hydrophilic and has minimal blood-brain barrier penetration.
- While theoretically safer than oxybutynin in terms of CNS effects, it has **lower bladder selectivity** compared to tolterodine and may cause more peripheral anticholinergic side effects (dry mouth, constipation).
Dementia and Cognitive Impairment Indian Medical PG Question 4: True about dementia is:
- A. Dementia due to atherosclerosis progresses in the same gradual manner as Alzheimer's disease
- B. Alzheimer's disease is due to multiple small strokes in the cerebral cortex
- C. Alzheimer's disease is associated with an increase in ACh release in the cerebral cortex
- D. Dementia involves a decline in memory and other cognitive functions affecting daily living (Correct Answer)
Dementia and Cognitive Impairment Explanation: ***Dementia involves a decline in memory and other cognitive functions affecting daily living***
- This statement accurately defines **dementia** as a significant decline in **cognitive functions**, including memory, language, problem-solving, and executive function, severe enough to interfere with daily activities.
- The progressive nature of this decline leads to impaired independence and functional disability.
*Dementia due to atherosclerosis progresses in the same gradual manner as Alzheimer's disease*
- **Vascular dementia**, often caused by atherosclerosis leading to stroke or chronic cerebral ischemia, typically has a **stepped or fluctuating progression** rather than the gradual, continuous decline seen in Alzheimer's disease.
- This is a key distinguishing feature between vascular dementia and Alzheimer's disease.
*Alzheimer's disease is due to multiple small strokes in the cerebral cortex*
- This describes **vascular dementia**, which is distinct from Alzheimer's disease.
- **Alzheimer's disease** is characterized by the accumulation of **amyloid plaques** and **neurofibrillary tangles** in the brain, not by strokes.
*Alzheimer's disease is associated with an increase in ACh release in the cerebral cortex*
- **Alzheimer's disease** is associated with a significant **reduction in acetylcholine (ACh) levels** in the cerebral cortex, particularly in regions vital for memory and learning.
- Many treatments for Alzheimer's aim to inhibit **acetylcholinesterase**, thereby increasing ACh availability to compensate for this deficit.
Dementia and Cognitive Impairment Indian Medical PG Question 5: A 60-year-old woman has recurrent falls, visual hallucinations, and fluctuating cognition. Exam shows parkinsonism. What is the most likely diagnosis?
- A. Alzheimer’s disease
- B. Lewy body dementia (Correct Answer)
- C. Parkinson’s disease
- D. Vascular dementia
Dementia and Cognitive Impairment Explanation: ***Lewy body dementia***
- This condition is characterized by a classic triad of symptoms: **fluctuating cognition**, recurrent **visual hallucinations**, and **parkinsonism**.
- **Recurrent falls** are also a common feature, stemming from severe **postural instability** and motor fluctuations.
*Alzheimer’s disease*
- The hallmark of Alzheimer's disease is **progressive memory loss** and cognitive decline [1], without prominent early **visual hallucinations** or marked **parkinsonism**.
- While falls can occur in later stages, they are not typically an early or recurrent feature to the same extent as in Lewy body dementia.
*Parkinson’s disease*
- Parkinson's disease primarily presents with **motor symptoms** such as **bradykinesia**, **rigidity**, **tremor**, and **postural instability** [2].
- Dementia and hallucinations can develop, but they usually occur much later in the disease course, often after years of established motor symptoms [3].
*Vascular dementia*
- This type of dementia is characterized by a **stepwise decline** in cognitive function, often associated with a history of **strokes** or **cardiovascular risk factors**.
- While it can cause cognitive fluctuations and falls, **visual hallucinations** and prominent **parkinsonism** are not typical early features.
Dementia and Cognitive Impairment Indian Medical PG Question 6: Subcortical dementia is seen in all except :
- A. Wilson's disease
- B. Alzheimer's disease (Correct Answer)
- C. Huntington's Chorea
- D. Parkinsonism
Dementia and Cognitive Impairment Explanation: ***Alzheimer's disease***
- Alzheimer's disease is primarily a **cortical dementia**, characterized by the impairment of higher cognitive functions like memory, language, and executive function due to degeneration of the cerebral cortex [1].
- While it can later affect subcortical structures, its hallmark features are related to cortical pathology, such as **neurofibrillary tangles** and amyloid plaques primarily in cortical regions [1].
*Wilson's disease*
- Wilson's disease is a genetic disorder of **copper metabolism** that leads to copper accumulation in the brain, liver, and other organs.
- The basal ganglia, a key subcortical structure, is particularly vulnerable to copper toxicity, leading to prominent **movement disorders** and **subcortical dementia**.
*Huntington's Chorea*
- Huntington's disease is a progressive neurodegenerative disorder characterized by the degeneration of neurons in the **basal ganglia** (especially the striatum) and cerebral cortex.
- The significant involvement of the basal ganglia leads to the characteristic **chorea** and **subcortical dementia** with cognitive slowing and executive dysfunction.
*Parkinsonism*
- Parkinsonism, particularly Parkinson's disease, is characterized by the degeneration of dopaminergic neurons in the **substantia nigra pars compacta**, a subcortical structure.
- This leads to motor symptoms and frequently also to **subcortical executive dysfunction** and slower processing speed, consistent with a subcortical dementia.
Dementia and Cognitive Impairment Indian Medical PG Question 7: All of the following are Anticholinesterases used in Alzheimer's disease except
- A. Donepezil
- B. Rivastigmine
- C. Memantine (Correct Answer)
- D. Galantamine
Dementia and Cognitive Impairment Explanation: ***Memantine***
- While used in Alzheimer's disease, **memantine** is an **NMDA receptor antagonist**, not an anticholinesterase.
- It works by blocking excessive **glutamatergic stimulation**, which is implicated in neurodegeneration.
*Donepezil*
- **Donepezil** is an **acetylcholinesterase inhibitor** used to treat mild to moderate Alzheimer's disease.
- It increases the availability of **acetylcholine** in the synaptic cleft, improving cognitive function.
*Rivastigmine*
- **Rivastigmine** is a **cholinesterase inhibitor** that acts on both **acetylcholinesterase** and **butyrylcholinesterase**.
- It is approved for the treatment of mild to moderate Alzheimer's disease and Parkinson's disease dementia.
*Galantamine*
- **Galantamine** is an **acetylcholinesterase inhibitor** and an **allosteric potentiator of nicotinic acetylcholine receptors**.
- It enhances cholinergic neurotransmission and is used in the treatment of mild to moderate Alzheimer's disease.
Dementia and Cognitive Impairment Indian Medical PG Question 8: Which of the following non-memory cognitive symptoms can be associated with Alzheimer's disease (AD)?
- A. Aphasia
- B. Apraxia
- C. Agnosia
- D. All of the options (Correct Answer)
Dementia and Cognitive Impairment Explanation: ***All of the options***
- Alzheimer's disease is characterized by a decline in various cognitive domains, extending beyond memory impairment to include **aphasia**, **apraxia**, and **agnosia**.
- These non-memory symptoms become increasingly prominent as the disease progresses and are essential for a comprehensive diagnostic evaluation.
*Aphasia*
- **Aphasia**, or difficulty with language production or comprehension, is a common non-memory cognitive symptom in AD.
- Patients may struggle to find words, understand spoken or written language, or produce coherent sentences.
*Apraxia*
- **Apraxia**, the inability to perform learned motor movements despite intact motor function and comprehension, is frequently observed in AD.
- This can manifest as difficulty with activities of daily living, such as dressing, eating, or using tools.
*Agnosia*
- **Agnosia**, the inability to recognize objects, people, sounds, shapes, or smells despite intact sensory function, is another non-memory cognitive deficit seen in AD.
- Patients may not recognize familiar faces or common household items.
Dementia and Cognitive Impairment Indian Medical PG Question 9: Dementia is present in all except:
- A. Lewy body dementia
- B. Pick's disease
- C. Ganser syndrome (Correct Answer)
- D. Alzheimer's disease
Dementia and Cognitive Impairment Explanation: ***Ganser syndrome***
- Ganser syndrome is a **factitious disorder** characterized by approximate answers, not true dementia.
- Patients with Ganser syndrome often present with dramatic, but ultimately **nonsensical responses** to simple questions, without a clear underlying organic cause of cognitive decline.
*Lewy body*
- **Lewy body dementia** is characterized by fluctuating cognition, recurrent visual hallucinations, and spontaneous parkinsonism.
- It involves the presence of **Lewy bodies** in cortical and subcortical regions leading to progressive cognitive decline.
*Pick's disease*
- Pick's disease, a type of frontotemporal dementia, is characterized by language and **behavioral changes** due to neuronal loss.
- It results in progressive **atrophy of the frontal and temporal lobes**, leading to profound cognitive deficits over time.
*Alzheimer's disease*
- **Alzheimer's disease** is the most common cause of dementia, characterized by progressive memory loss and cognitive impairment.
- It is pathologically defined by the presence of **amyloid plaques** and **neurofibrillary tangles** in the brain.
Dementia and Cognitive Impairment Indian Medical PG Question 10: Which of the following dementia is associated with visual hallucinations?
- A. Lewy body dementia (Correct Answer)
- B. AIDS related Dementia
- C. Mixed dementia
- D. Huntington's disease
Dementia and Cognitive Impairment Explanation: ***Lewy body dementia***
- **Visual hallucinations**, particularly of well-formed and detailed images, are a **core clinical feature** of Lewy body dementia (LBD).
- Other key features include **fluctuating cognition** with pronounced variations in attention and alertness, and **spontaneous parkinsonism**.
*AIDS related Dementia*
- Primarily presents with cognitive and motor slowing, **apathy**, and difficulty with complex tasks, rather than prominent visual hallucinations.
- It is a subcortical dementia caused by **HIV infection** directly affecting the brain.
*Mixed dementia*
- This typically refers to a combination of **Alzheimer's disease** and **vascular dementia**, where hallucinations are not a prominent or early feature.
- While visual hallucinations can occur in advanced stages of any dementia, they are not a defining characteristic of mixed dementia.
*Huntington's disease*
- Characterized by **chorea**, psychiatric disturbances, and cognitive decline, primarily affecting executive function.
- **Visual hallucinations** are not a typical feature of Huntington's disease, although psychiatric symptoms like psychosis can occur.
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