Seizure Disorders and Epilepsy — MCQs
Which of the following is LEAST preferred as first-line treatment for pediatric status epilepticus?
What is correct about febrile seizures
All are features of absence seizures except which of the following?
All the following are indications for brain imaging in epilepsy, except:
Which of the following seizures has a clinical presentation of impaired consciousness with motor, sensory, or autonomic symptoms which are focal?
Absence seizures are characterized on EEG by:
Which of the following electrolyte abnormalities is a cause of status epilepticus in a child?
72-year-old gentleman with normal renal functions presents with new onset focal seizures. Which of the following is the best drug to manage the patient?
Caution is taken while doing Inter-maxillary Fixation (IMF) for which of these types of patients?
The percentage of children with simple febrile seizures who develop epilepsy is:
Seizure Disorders and Epilepsy Indian Medical PG Practice Questions and MCQs
Question 1: Which of the following is LEAST preferred as first-line treatment for pediatric status epilepticus?
- A. Clonazepam (Correct Answer)
- B. Fosphenytoin
- C. Diazepam
- D. Phenobarbital
Explanation: ***Clonazepam*** - While a benzodiazepine, **clonazepam** is generally not considered a first-line agent for acute status epilepticus due to its **slower onset of action** compared to other benzodiazepines like midazolam or diazepam. - Its longer half-life also makes it less ideal for rapid termination of seizures when immediate action is needed to prevent neuronal injury. *Fosphenytoin* - **Fosphenytoin** is a **prodrug of phenytoin** that is often used as a second-line agent for status epilepticus after benzodiazepines have failed. - It can be administered more rapidly and has a lower risk of local injection site reactions compared to phenytoin, making it a viable option when first-line agents are insufficient. *Diazepam* - **Diazepam** is a **short-acting benzodiazepine** that is a preferred first-line treatment for status epilepticus, especially in the pre-hospital setting or as an initial hospital intervention. - It has a **rapid onset of action** when administered intravenously or rectally, effectively terminating seizures quickly. *Phenobarbital* - **Phenobarbital** is a **barbiturate** that acts as a potent anticonvulsant and is considered a second-line or third-line treatment option for status epilepticus, particularly in pediatric patients. - While effective, its use is often reserved for cases unresponsive to benzodiazepines due to its potential for **respiratory depression** and sedative effects.
Question 2: What is correct about febrile seizures
- A. Focal deficits
- B. Repeated seizure
- C. Abnormal EEG
- D. Normal EEG (Correct Answer)
Explanation: ***Normal EEG*** - An **electroencephalogram (EEG)** is generally **not recommended** after a simple febrile seizure because these seizures are due to the brain's response to fever, not an underlying epileptic disorder. - The **EEG typically appears normal** following a simple febrile seizure, as there is no intrinsic cerebral pathology to detect. - Simple febrile seizures are benign events that do not require routine EEG investigation. *Focal deficits* - **Focal neurological deficits** (e.g., weakness on one side of the body) are **not characteristic** of **simple febrile seizures** and would suggest a more complex neurological issue or an underlying etiology. - The presence of focal deficits would prompt further investigation for complex febrile seizures or other neurological conditions. *Repeated seizure* - While **recurrence of febrile seizures** is common (about 30-35% of children experience a second seizure), this refers to a **risk factor** for recurrence rather than a defining characteristic of febrile seizures. - Risk factors for recurrence include young age at first seizure, family history of febrile seizures, low fever at onset, and brief duration between fever onset and seizure. *Abnormal EEG* - An **abnormal EEG** in the context of a febrile seizure would raise concerns for an **underlying epileptic syndrome** or other neurological pathology, which is not typical for **simple febrile seizures**. - Routine EEG is not indicated for simple febrile seizures as it is unlikely to show abnormalities and is not predictive of future epilepsy.
Question 3: All are features of absence seizures except which of the following?
- A. Usually seen in childhood
- B. Postictal confusion (Correct Answer)
- C. 3–Hz spike wave in EEG
- D. Brief episodes of staring
Explanation: ***Postictal confusion*** - **Absence seizures** are characterized by an **abrupt return to baseline mental status** immediately after the seizure [2]. - **Postictal confusion** is a hallmark of **generalized tonic-clonic seizures** or **complex partial seizures**, where the brain needs time to recover [4], [5]. *Usually seen in childhood* - This is a **correct** feature of absence seizures, as they typically begin between the ages of **4 and 12 years** [3]. - They are considered a form of **childhood epilepsy** and are rarely seen in adults. *3–Hz spike wave in EEG* - This is the **classic EEG finding** for **absence seizures**, representing generalized, synchronized activity [2]. - The **3-Hz spike-and-wave pattern** is pathognomonic for this seizure type [3]. *Brief episodes of staring* - Absence seizures present as **brief, sudden cessations of activity** and awareness, often appearing as **staring spells** [1], [2]. - The individual typically stops what they are doing, stares blankly, and is **unresponsive to external stimuli** for a few seconds [3].
Question 4: All the following are indications for brain imaging in epilepsy, except:
- A. EEG shows a focal seizure source
- B. Control of seizures is difficult
- C. Seizures have focal features clinically
- D. Epilepsy starts after the age of 5 years (Correct Answer)
Explanation: Address the indications for brain imaging in epilepsy based on clinical guidelines. ***Epilepsy starts after the age of 5 years*** - The recommendation for **brain imaging** is typically suggested for epilepsy onset after the age of **16 years** to rule out structural causes, rather than age 5 [2]. An onset at age 5 does not exclude the possibility of idiopathic epilepsy, which often does not require imaging [1]. - While it's a good practice to image any new onset epilepsy, age 5 by itself is not a specific indication that *demands* imaging beyond standard workup if no other red flags are present. *EEG shows a focal seizure source* - A **focal seizure source identified on EEG** strongly indicates a structural lesion in the brain that could be responsible for the seizures [2]. - **Brain imaging** (e.g., MRI) is essential to identify the underlying **structural abnormality**, such as a tumor, malformation, or scar tissue [2]. *Control of seizures is difficult* - Poorly controlled or **refractory seizures** warrant further investigation with brain imaging to look for an **underlying structural cause** that might be amenable to surgical intervention or require alternative therapies [2]. - This suggests the possibility of a lesion that is not responding to standard anti-epileptic drugs, necessitating a search for the **etiology of intractability** [3]. *Seizures have focal features clinically* - **Focal clinical features** (e.g., twitching of one limb, sensory disturbances on one side) strongly point to a specific area of the brain where the seizures originate [4]. - **Brain imaging** is crucial to identify any **structural lesion** (e.g., tumor, malformation, stroke) corresponding to the clinically localized area of seizure onset [2].
Question 5: Which of the following seizures has a clinical presentation of impaired consciousness with motor, sensory, or autonomic symptoms which are focal?
- A. Simple partial
- B. Generalized tonic clonic
- C. Complex partial (Correct Answer)
- D. Status epilepticus
Explanation: ***Complex partial*** - This type of seizure involves **impaired consciousness** (though not complete loss) and usually originates in a specific, **focal area** of the brain [1]. - It presents with various **motor, sensory, or autonomic symptoms** depending on the affected brain region, such as lip smacking, automatisms, or odd sensations [1]. *Simple partial* - While also focal, **consciousness remains intact** during a simple partial seizure, distinguishing it from the described scenario [1]. - Symptoms are often localized and can include motor jerking, sensory changes, or autonomic phenomena, but **without altered awareness** [1]. *Generalized tonic clonic* - This seizure type involves **loss of consciousness** from the onset and affects both sides of the brain, leading to characteristic tonic (stiffening) and clonic (jerking) phases [2]. - It does not present with **focal motor, sensory, or autonomic symptoms** in the way a complex partial seizure does, and consciousness is completely lost [2]. *Status epilepticus* - This is a medical emergency defined as a **prolonged seizure** (typically lasting more than 5 minutes) or **repeated seizures** without full recovery of consciousness between them. - It refers to the duration or pattern of seizures, not a specific seizure type with focal symptoms and impaired consciousness as described.
Question 6: Absence seizures are characterized on EEG by:
- A. Generalized polyspikes
- B. Hypsarrhythmia
- C. 1-2 Hz spike & wave
- D. 3 Hz spike and wave (Correct Answer)
Explanation: ***3 Hz spike and wave*** - **Absence seizures** are classically characterized by a **generalized, synchronous 3 Hz spike-and-wave discharge** pattern on EEG. - This pattern is seen bilaterally and symmetrically, reflecting the generalized nature of the seizure. *Generalized polyspikes* - **Generalized polyspikes** (multiple spikes) are often associated with other types of generalized seizures, such as **myoclonic seizures**, rather than typical absence seizures. - While reflecting generalized activity, the specific **3 Hz spike-and-wave** is the hallmark of absence seizures. *Hypsarrhythmia* - **Hypsarrhythmia** is a chaotic, high-amplitude, irregular pattern seen in **infantile spasms** (West syndrome), not absence seizures. - It is characterized by random high-voltage slow waves and spikes in all derivations. *1-2 Hz spike & wave* - A **slow spike-and-wave pattern (1-2.5 Hz)** is typically associated with **Lennox-Gastaut syndrome**, a severe epileptic encephalopathy. - This differs significantly from the faster **3 Hz spike-and-wave** characteristic of typical absence seizures.
Question 7: Which of the following electrolyte abnormalities is a cause of status epilepticus in a child?
- A. Hypokalemia
- B. Hyperkalemia
- C. Hypernatremia
- D. Hyponatremia (Correct Answer)
Explanation: ***Hyponatremia*** - **Hyponatremia** (low sodium levels) can lead to **cerebral edema**, increasing intracranial pressure and predisposing to seizures, including status epilepticus, especially in children. - Rapid shifts in fluid balance and electrolyte disturbances, such as those seen with severe hyponatremia, can destabilize neuronal membranes and trigger **sustained seizure activity**. *Hypokalemia* - While significant **hypokalemia** (low potassium) affects cardiac and muscular function, it is **less commonly a direct cause of seizures** or status epilepticus compared to sodium imbalances. - Severe hypokalemia can impact neuronal excitability but primarily causes **muscle weakness** and **cardiac arrhythmias**. *Hyperkalemia* - **Hyperkalemia** (high potassium) primarily affects **cardiac conduction** and neuromuscular function, leading to **bradycardia** or **cardiac arrest**. - It is **not typically associated with seizures** or status epilepticus in children. *Hypernatremia* - **Hypernatremia** (high sodium) indicates a relative water deficit, leading to cell shrinkage and potentially **intracranial hemorrhage** or **thrombosis**. - While severe hypernatremia can cause neurological symptoms like **lethargy** or **coma**, it is **less commonly a direct cause of status epilepticus** compared to hyponatremia.
Question 8: 72-year-old gentleman with normal renal functions presents with new onset focal seizures. Which of the following is the best drug to manage the patient?
- A. Oxcarbazepine
- B. Sodium valproate
- C. Pregabalin
- D. Levetiracetam (Correct Answer)
Explanation: ***Levetiracetam*** - **Levetiracetam** is an excellent choice for elderly patients with new-onset focal seizures due to its favorable side effect profile, **minimal drug interactions**, and lack of significant hepatic or renal metabolism, making it suitable for those with normal renal function. - It has a generally **good tolerability**, especially important in the elderly who may be on multiple medications and more sensitive to side effects. *Oxcarbazepine* - **Oxcarbazepine** can cause significant **hyponatremia**, which is a concern in elderly patients who may already be at risk due to other medications or conditions. - While effective for focal seizures, its potential for electrolyte disturbances makes it less ideal than levetiracetam in this demographic. *Sodium valproate* - **Sodium valproate** is associated with a higher risk of **cognitive side effects**, sedation, and **tremor**, which can significantly impact the quality of life in elderly patients. - It also has a potential for **hepatotoxicity** and numerous drug interactions, making it a less preferred option. *Pregabalin* - **Pregabalin** is primarily indicated for partial seizures and **neuropathic pain**, and while it can be used as an add-on therapy, it is not typically a first-line monotherapy for new-onset focal seizures. - It often causes **dizziness and somnolence**, which can increase the risk of falls in the elderly, a major concern in this age group.
Question 9: Caution is taken while doing Inter-maxillary Fixation (IMF) for which of these types of patients?
- A. Psychiatric disorders
- B. All of the options (Correct Answer)
- C. Substance abusers
- D. Epileptics
Explanation: ***All of the options*** - All of these patient groups require extra caution during IMF due to potential complications during the period of jaw immobilization. - For patients with **psychiatric disorders**, **substance abuse**, or **epilepsy**, the risks associated with IMF often outweigh the benefits, necessitating careful assessment and alternative treatment strategies. *Psychiatric disorders* - Patients with psychiatric disorders may have difficulty tolerating the **entrapment** feeling of IMF. - They also have a higher risk of **non-compliance** and may attempt to remove the fixation. *Substance abusers* - **Vomiting** is common in substance abusers, which can lead to **aspiration** if the jaw is wired shut. - These patients may also be **non-compliant** with post-operative care instructions, jeopardizing treatment outcomes. *Epileptics* - **Seizures** during IMF can lead to serious complications, including **aspiration** if vomiting occurs. - The forceful jaw movements during a seizure can also cause **fracture of the teeth** or damage to already **repaired jaw bones**.
Question 10: The percentage of children with simple febrile seizures who develop epilepsy is:
- A. 1-2% (Correct Answer)
- B. 5-10%
- C. 2-5%
- D. 10-20%
Explanation: ***1-2%*** - The risk of developing **epilepsy** after a simple febrile seizure is generally low, estimated to be around **1-2%**. - This low percentage highlights that simple febrile seizures are typically benign and do not commonly lead to chronic seizure disorders. *5-10%* - This percentage is too high for the risk of epilepsy after a **simple febrile seizure**. - A higher risk might be associated with complex febrile seizures or other neurological predisposition. *2-5%* - While closer, this range is still slightly higher than the generally accepted risk for uncomplicated **simple febrile seizures** leading to epilepsy. - This range might be considered for cases with some atypical features, but not for typical simple febrile seizures. *10-20%* - This percentage represents a significantly **elevated risk** that is far beyond what is observed for typical simple febrile seizures. - Such a high risk would indicate a much more serious underlying neurological disorder or complex seizure presentation.
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