Antiepileptic Drugs — MCQs
The first step on priority basis required in the management of status epilepticus is
Which antiepileptic drug requires regular monitoring of liver enzymes?
Intravenous anaesthetic agent of choice in status epilepticus
30 year old female with partial seizure. Drug of choice:
The drug of choice for absence attacks is
Sodium valproate is not the drug of choice for which of the following seizure types?
All the following drugs are used for Absence seizures except -
Drug of choice in absence seizures:
Which drug is suitable for epilepsy related to a brain tumor?
A 6-year-old child has poor school performance. On scolding by teacher abnormal behavior is noted. EEG is performed. Which of the following drugs will cause worsening of the patient?
Antiepileptic Drugs Indian Medical PG Practice Questions and MCQs
Question 1: The first step on priority basis required in the management of status epilepticus is
- A. i.v. Phenytoin
- B. i.v. Phenobarbitone
- C. Airway maintenance (Correct Answer)
- D. i.v. Diazepam
Explanation: ***Airway maintenance*** - Maintaining a **patent airway** is the absolute first step in any emergency, especially in status epilepticus where respiratory depression and aspiration risk are high [2]. - Ensuring adequate **oxygenation and ventilation** is critical for preventing brain hypoxia and further complications [1]. *i.v. Phenytoin* - While an important drug for the long-term management and prevention of recurrent seizures, **phenytoin** has a delayed onset of action and is not the first-line agent for acute seizure termination in status epilepticus. - It is typically administered after initial first-line agents like benzodiazepines have been given. *i.v. Phenobarbitone* - **Phenobarbitone** is a potent anticonvulsant and can be used in refractory status epilepticus, but it is not the very first step. - Its use often comes with significant **sedation and respiratory depression**, necessitating close airway monitoring. *i.v. Diazepam* - **Intravenous diazepam** is a rapid-acting benzodiazepine and is usually the first-line medication to **terminate acute seizures** in status epilepticus. - However, airway maintenance precedes even medication administration to ensure patient safety before drug effects take hold [1], [2].
Question 2: Which antiepileptic drug requires regular monitoring of liver enzymes?
- A. Valproate (Correct Answer)
- B. Levetiracetam
- C. Lamotrigine
- D. Phenytoin
Explanation: ***Valproate*** - **Valproate** is known to cause dose-related **hepatotoxicity**, ranging from asymptomatic enzyme elevation to fatal hepatic failure, especially in young children and those on polytherapy. - Regular monitoring of **liver function tests (LFTs)** is crucial to detect early signs of liver injury and adjust treatment. *Levetiracetam* - **Levetiracetam** is generally well-tolerated and does not typically require routine monitoring of liver enzymes due to its primary renal excretion and low potential for hepatotoxicity. - While mild, transient elevations in LFTs can occur, they are usually not clinically significant. *Lamotrigine* - **Lamotrigine** is primarily known for causing serious **skin rashes** (e.g., Stevens-Johnson syndrome) rather than significant hepatotoxicity. - Routine liver enzyme monitoring is generally not recommended unless there are other risk factors for hepatic dysfunction. *Phenytoin* - Although **phenytoin** can cause idiosyncratic liver injury, it is not as consistently associated with dose-related hepatotoxicity as valproate. - Monitoring of **phenytoin levels** is crucial [1], but routine liver enzyme monitoring is not typically mandated as strictly as for valproate.
Question 3: Intravenous anaesthetic agent of choice in status epilepticus
- A. Thiopentone
- B. Etomidate
- C. Ketamine
- D. Propofol (Correct Answer)
Explanation: ***Propofol*** - **Propofol** is favored due to its rapid onset and short duration of action, allowing for quick titration to seizure control and rapid assessment of neurological function post-seizure. - Its potent GABAergic effects effectively **suppress seizure activity** in refractory status epilepticus. *Thiopentone* - While effective in terminating seizures due to its potent GABAergic action, **thiopentone** has a much longer context-sensitive half-time, leading to prolonged sedation and delayed neurological assessment. - Its use often necessitates **intubation and mechanical ventilation** due to significant respiratory depression. *Etomidate* - **Etomidate** is a potent sedative that can terminate seizures but is strongly associated with **adrenal suppression** due to inhibition of 11-β-hydroxylase, which limits its use in status epilepticus, particularly with prolonged infusions. - It has a short duration of action but lacks the neuroprotective properties of other agents and can cause **myoclonus**, which might be confused with ongoing seizure activity. *Ketamine* - **Ketamine** primarily acts as an NMDA receptor antagonist and is often used in refractory status epilepticus that fails to respond to GABAergic drugs (benzodiazepines, propofol, barbiturates). - It is not considered the **first-line intravenous anesthetic agent of choice** and is typically reserved for later stages of management due to its different mechanism of action and potential side effects like hallucinations and cardiovascular stimulation.
Question 4: 30 year old female with partial seizure. Drug of choice:
- A. Phenytoin
- B. Carbamazepine (Correct Answer)
- C. Phenobarbitone
- D. Na+ valproate
Explanation: ***Carbamazepine*** - **Carbamazepine** is a first-line drug of choice for treating **partial seizures** due to its efficacy in controlling seizure activity with a generally favorable side effect profile. - It works by blocking **voltage-gated sodium channels**, thereby stabilizing the inactivated state of Na+ channels and preventing repetitive firing of action potentials. *Phenytoin* - While **phenytoin** is effective for partial seizures by blocking **sodium channels**, its use is often limited by its non-linear kinetics and significant side effects, including **gingival hyperplasia**, hirsutism, and cerebellar atrophy with chronic use. - Due to these side effects and monitoring difficulties, it's often considered a second-line option or for acute seizure control rather than initial monotherapy. *Phenobarbitone* - **Phenobarbitone** is an older antiepileptic drug that enhances **GABAergic neurotransmission**, but it is generally not a first-line agent for partial seizures due to its sedative properties, cognitive side effects, and potential for drug interactions. - Its use has largely been replaced by newer, better-tolerated drugs as a primary treatment. *Na+ valproate* - **Sodium valproate** is a broad-spectrum antiepileptic drug effective for both partial and generalized seizures, but it is typically not the first-line drug of choice specifically for partial seizures in female patients of childbearing age due to concerns about **teratogenicity and PCOS risk**. - Its mechanism involves multiple actions, including enhancing GABA activity, blocking sodium channels, and blocking T-type calcium channels.
Question 5: The drug of choice for absence attacks is
- A. Phenytoin
- B. Primidone
- C. Ethosuximide (Correct Answer)
- D. Phenobarbitone
Explanation: ***Ethosuximide*** - **Ethosuximide** is the most effective and preferred drug for treating **absence seizures** due to its selective mechanism of action. - It works by blocking **T-type calcium channels** in the thalamus, which are crucial for generating the characteristic 3-Hz spike-and-wave discharges of absence seizures. *Phenytoin* - **Phenytoin** is primarily used for **tonic-clonic seizures** and **focal seizures**, but it is generally ineffective for absence seizures and can even worsen them. - Its mechanism of action involves stabilizing neuronal membranes by **blocking voltage-gated sodium channels**, which is not the primary pathophysiology of absence seizures. *Primidone* - **Primidone** is an anticonvulsant that is metabolized to **phenobarbital** and **phenylethylmalonamide (PEMA)**. It is effective for **generalized tonic-clonic** and **focal seizures**. - It is not considered a first-line treatment for **absence seizures** and may not be effective. *Phenobarbitone* - **Phenobarbitone** (phenobarbital) is a barbiturate effective against **generalized tonic-clonic** and **focal seizures** but is not a drug of choice for absence seizures. - While it has broad-spectrum anticonvulsant activity by enhancing **GABAergic inhibition**, it is less effective and has more prominent sedative side effects compared to ethosuximide for absence epilepsy.
Question 6: Sodium valproate is not the drug of choice for which of the following seizure types?
- A. Absence seizures
- B. Myoclonic seizures
- C. Atonic seizures
- D. Infantile spasms (Correct Answer)
Explanation: ***Infantile spasms*** - While valproate can be used as an add-on therapy, it is **not the first-line drug of choice** for infantile spasms, which typically respond better to **ACTH (adrenocorticotropic hormone)** or **vigabatrin**. - Infantile spasms often have a unique **hypsarrhythmia** pattern on EEG and a distinct clinical presentation from other seizure types. *Absence seizures* - Sodium valproate is considered an **effective broad-spectrum antiepileptic drug** used in the treatment of absence seizures. - It works by increasing **GABA concentrations** in the brain, which helps to suppress spike-and-wave discharges characteristic of absence seizures. *Myoclonic seizures* - **Sodium valproate** is a highly effective first-line treatment for various generalized seizure types, including myoclonic seizures. - Its broad mechanism of action, affecting GABAergic and glutamatergic neurotransmission, makes it suitable for these generalized seizure types. *Atonic seizures* - Sodium valproate is a commonly used drug for atonic seizures, especially in the context of **Lennox-Gastaut syndrome**. - It helps to reduce the sudden loss of muscle tone associated with atonic seizures, improving seizure control.
Question 7: All the following drugs are used for Absence seizures except -
- A. Valproate
- B. Ethosuximide
- C. Clonazepam
- D. Phenytoin (Correct Answer)
Explanation: ***Phenytoin*** - Phenytoin is primarily effective in treating **tonic-clonic seizures** and **focal seizures** by blocking voltage-gated sodium channels. - It can actually exacerbate **absence seizures** or have no therapeutic effect on them. *Valproate* - **Valproate** is a broad-spectrum antiepileptic drug effective against various seizure types, including **absence seizures**. - It works by blocking **voltage-gated sodium channels**, enhancing GABAergic transmission, and inhibiting T-type calcium channels. *Ethosuximide* - **Ethosuximide** is the **first-line drug** for treating **absence seizures** due to its selective action. - It primarily acts by blocking **T-type calcium channels** in the thalamic neurons, which are crucial for generating absence seizures. *Clonazepam* - **Clonazepam**, a benzodiazepine, is effective for treating **absence seizures** by enhancing **GABAergic inhibitory neurotransmission**. - It can be used as an **adjunct or alternative** when other drugs are not effective or tolerated, though it has more sedative side effects.
Question 8: Drug of choice in absence seizures:
- A. Carbamazepine
- B. Valproate (Correct Answer)
- C. Phenytoin
- D. BZD
Explanation: ***Valproate*** - **Valproate** is considered a **first-line drug for absence seizures**, particularly effective for **all types of generalized seizures** including absence, myoclonic, and tonic-clonic seizures. - It works by increasing GABA levels and modulating voltage-gated sodium channels, which helps to stabilize neuronal excitability. - **Advantage**: Provides **broad-spectrum coverage**, making it the preferred choice when **mixed seizure types** are present or when **juvenile absence epilepsy** is suspected. - **Note**: **Ethosuximide** is also a first-line drug for **pure typical absence seizures** (especially in children), but valproate is often preferred when broader anticonvulsant coverage is needed. *Carbamazepine* - **Carbamazepine** is effective for **focal (partial) seizures** and **generalized tonic-clonic seizures**. - It can **exacerbate or worsen absence seizures**, making it contraindicated in this seizure type. - Mechanism: Blocks voltage-gated sodium channels, which is ineffective for absence seizures. *Phenytoin* - **Phenytoin** is primarily used for **focal (partial) seizures** and **generalized tonic-clonic seizures**. - Like carbamazepine, **phenytoin can worsen absence seizures** and is contraindicated. - Its mechanism of action (sodium channel blockade) is not suitable for absence seizures. *BZD (Benzodiazepines)* - While benzodiazepines like **clonazepam** can be used as **adjunctive therapy** for refractory absence seizures, they are **not first-line drugs**. - **Limitations**: Sedation, tolerance development, and dependence risk. - **Diazepam** and **lorazepam** are reserved for **acute seizure management** (status epilepticus) rather than chronic seizure control.
Question 9: Which drug is suitable for epilepsy related to a brain tumor?
- A. Levetiracetam (Correct Answer)
- B. Phenytoin
- C. Phenobarbitone
- D. Carbamazepine
Explanation: ***Levetiracetam*** - Levetiracetam is often preferred for **tumor-related epilepsy** due to its favorable **pharmacokinetic profile**, minimal **drug-drug interactions**, and broad spectrum of activity against various seizure types. - It does not significantly induce or inhibit hepatic enzymes, making it a safer option for patients who may be on other medications for their tumor or cancer treatment. *Phenytoin* - **Phenytoin** has a narrow **therapeutic window** and significant **drug-drug interactions** due to its potent hepatic enzyme induction, which can complicate concomitant use with **chemotherapy** or other medications. - It also has a dose-dependent non-linear pharmacokinetic profile, making dose adjustments challenging and increasing the risk of **toxicity**. *Phenobarbitone* - **Phenobarbitone** is a potent enzyme inducer and has a high potential for **sedation** and cognitive side effects, which can significantly impair the quality of life for patients. - Its long half-life and propensity for **drug interactions** make it less desirable, especially in patients with brain tumors who may experience other neurological deficits. *Carbamazepine* - **Carbamazepine** is another potent **enzyme inducer** that can lead to significant **drug interactions**, particularly with chemotherapy agents, altering their metabolism and efficacy. - It often causes side effects like **drowsiness**, **dizziness**, and can lead to **hyponatremia**, which may be problematic in patients who are already compromised.
Question 10: A 6-year-old child has poor school performance. On scolding by teacher abnormal behavior is noted. EEG is performed. Which of the following drugs will cause worsening of the patient?
- A. Ethosuximide
- B. Valproate
- C. Carbamazepine (Correct Answer)
- D. Clonazepam
Explanation: ***Carbamazepine*** - The EEG image shows **generalized spike-wave complexes at 3 Hz**, which are characteristic of **absence seizures** (also known as petit mal seizures). - **Carbamazepine** is known to **exacerbate absence seizures** and should be avoided in patients with this diagnosis. *Ethosuximide* - This is a **first-line drug** specifically for treating **absence seizures**. - It works by blocking **T-type calcium channels** in the thalamus, effectively reducing spike-wave discharges. *Valproate* - **Valproate** is a broad-spectrum anticonvulsant effective against various seizure types, including **absence seizures**, generalized tonic-clonic seizures, and myoclonic seizures. - It is an appropriate choice if ethosuximide is ineffective or if other seizure types coexist. *Clonazepam* - **Clonazepam** is a **benzodiazepine** that can be used as an add-on therapy for **absence seizures**, especially in refractory cases. - While it has sedative side effects, it does not typically worsen absence seizures; rather, it helps control them.
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