Migraine Therapeutics — MCQs
A 35-year-old woman presents with a persistent, throbbing headache on one side of her head, associated with nausea and sensitivity to light. What is the most likely diagnosis?
A female patient presents to you with a unilateral headache. It is associated with nausea, photophobia, and phonophobia. What is the drug of choice for acute management?
All of the following drugs are used in prophylaxis of migraine except
Prophylaxis for migraine -
Which enzyme is irreversibly inhibited by aspirin?
In an animal model, the phenomenon of vasomotor reversal of Dale can be demonstrated by which of the following?
The Drug of choice for a pregnant woman in 2nd trimester with pustular psoriasis is:
A 35-year-old with migraines needs prophylaxis. Which is suitable?
The following malformation in a baby due to drug intake by mother is classified as \qquad ADR?
Consider the following statements with regard to the treatment of vitamin A deficiency : I. Repeated high doses of retinol can cause liver damage and teratogenicity II. Acute overdose of vitamin A may lead to increased intracranial pressure and skin desquamation III. Regular vitamin A supplementation is also recommended for pregnant women even in countries where vitamin A deficiency is not endemic IV. Excessive intake of carotene may cause harmless orange pigmentation of the skin Which of the statements given above are correct?
Migraine Therapeutics Indian Medical PG Practice Questions and MCQs
Question 1: A 35-year-old woman presents with a persistent, throbbing headache on one side of her head, associated with nausea and sensitivity to light. What is the most likely diagnosis?
- A. Cluster headache
- B. Tension headache
- C. Sinusitis
- D. Migraine (Correct Answer)
Explanation: ***Migraine*** - Migraines are characterized by **unilateral, throbbing headaches** associated with **nausea, vomiting**, and **sensitivity to light (photophobia)** and sound (phonophobia) [1]. - The patient's presentation perfectly aligns with the classic symptoms of a migraine attack [1]. *Cluster headache* - Cluster headaches are characterized by **severe, unilateral pain**, but they are typically **periorbital or temporal** and associated with **autonomic symptoms** such as lacrimation, rhinorrhea, ptosis, and miosis [1]. - Unlike migraines, they tend to occur in clusters over several weeks or months, followed by a period of remission. *Tension headache* - Tension headaches are usually described as a **dull, aching pain** or a **tight band around the head**, often bilateral, and are typically **not associated with nausea, vomiting, or photophobia** [1]. - They are generally less severe and do not worsen with physical activity. *Sinusitis* - Sinusitis can cause headache, but it is typically accompanied by **facial pressure or pain**, nasal congestion, colored discharge, and sometimes fever. - The pain is usually localized to the frontal, maxillary, or ethmoid sinuses and is not typically throbbing or associated with photophobia and nausea to the extent seen in migraines.
Question 2: A female patient presents to you with a unilateral headache. It is associated with nausea, photophobia, and phonophobia. What is the drug of choice for acute management?
- A. Flunarizine
- B. Sumatriptan (Correct Answer)
- C. Propranolol
- D. Topiramate
Explanation: ***Sumatriptan*** - **Sumatriptan**, a **triptan**, is an effective abortive therapy for **acute migraine attacks** due to its selective serotonin 5-HT1B/1D receptor agonist action, leading to vasoconstriction and inhibition of neurogenic inflammation. - The symptoms described—**unilateral headache**, nausea, **photophobia**, and **phonophobia**—are classic features of migraine. *Flunarizine* - **Flunarizine** is a **calcium channel blocker** used for migraine **prophylaxis**, not for acute treatment. - It is typically prescribed for patients experiencing frequent or severe migraine attacks to reduce their incidence. *Propranolol* - **Propranolol** is a **beta-blocker** primarily used for migraine **prophylaxis**. - It helps prevent migraine attacks by modulating cerebral blood flow and neuronal excitability, but it is not effective for acute pain relief during an attack. *Topiramate* - **Topiramate** is an **antiepileptic drug** often used for migraine **prophylaxis**. - It works by various mechanisms, including altering neurotransmitter activity, but it does not provide acute symptomatic relief for an ongoing migraine attack.
Question 3: All of the following drugs are used in prophylaxis of migraine except
- A. Topiramate
- B. Levetiracetam (Correct Answer)
- C. Propranolol
- D. Flunarizine
Explanation: ***Levetiracetam*** - **Levetiracetam** is primarily an **antiepileptic drug** and is not typically used for migraine prophylaxis due to a lack of strong evidence supporting its efficacy in this indication. - While some antiepileptic drugs are effective in migraine prevention, levetiracetam does not fall into this category. *Topiramate* - **Topiramate** is a well-established drug used for **migraine prophylaxis**. - It works through multiple mechanisms, including modulation of **GABAergic** and **glutamatergic** systems, and is frequently prescribed for preventing migraine attacks. *Propranolol* - **Propranolol** is a **beta-blocker** commonly used for migraine prophylaxis. - It helps by stabilizing vascular tone and reducing the frequency and severity of migraine attacks. *Flunarizine* - **Flunarizine** is a **calcium channel blocker** used for migraine prophylaxis, particularly in Europe and other regions. - It works by preventing cerebral vasoconstriction and has demonstrated efficacy in reducing migraine frequency.
Question 4: Prophylaxis for migraine -
- A. Amitriptyline (Correct Answer)
- B. Sumatriptan
- C. Diazepam
- D. Nifedipine
Explanation: ***Amitriptyline*** - **Amitriptyline**, a **tricyclic antidepressant**, is commonly used for migraine prophylaxis due to its neuromodulatory effects that can reduce headache frequency and severity. - It works by affecting neurotransmitters like **serotonin** and **norepinephrine**, which play a role in migraine pathophysiology. *Nifedipine* - **Nifedipine** is a **calcium channel blocker** primarily used for hypertension and angina, not typically for migraine prophylaxis. - While other calcium channel blockers like **verapamil** can be used for migraine, nifedipine is not a first-line or common choice. *Sumatriptan* - **Sumatriptan** is an **abortive medication** used to treat acute migraine attacks once they have started. - It works by constricting blood vessels and blocking pain pathways in the brain, but it is not used for chronic prevention. *Diazepam* - **Diazepam** is a **benzodiazepine** primarily used for anxiety, muscle spasms, and seizures due to its sedative and anxiolytic properties. - It is not indicated for migraine prophylaxis and can sometimes worsen headaches with chronic use or withdrawal.
Question 5: Which enzyme is irreversibly inhibited by aspirin?
- A. Lipooxygenase
- B. Cyclooxygenase (Correct Answer)
- C. Thromboxane synthase
- D. Phospholipase
Explanation: ***Cyclooxygenase*** - **Aspirin** irreversibly inhibits **cyclooxygenase (COX-1 and COX-2)** by acetylating a serine residue in the enzyme's active site. - This irreversible inhibition prevents the production of **prostaglandins, thromboxane**, and **prostacyclin**, thereby reducing inflammation, pain, fever, and platelet aggregation. *Lipooxygenase* - **Lipooxygenase** is involved in the synthesis of **leukotrienes**, which are mediators of inflammation and allergic responses. - Aspirin does not directly inhibit lipooxygenase; rather, it primarily targets the COX pathway. *Thromboxane synthase* - **Thromboxane synthase** is an enzyme downstream of COX, responsible for converting prostaglandin H2 into **thromboxane A2**. - While aspirin's effect on platelet aggregation is due to reduced thromboxane A2 synthesis via COX inhibition, it does not directly inhibit thromboxane synthase itself. *Phospholipase* - **Phospholipase A2** is responsible for releasing **arachidonic acid** from cell membrane phospholipids, which is the initial step in both the cyclooxygenase and lipooxygenase pathways. - Aspirin does not directly inhibit phospholipase A2; its action occurs later in the cascade.
Question 6: In an animal model, the phenomenon of vasomotor reversal of Dale can be demonstrated by which of the following?
- A. Stimulation of alpha-1 followed by stimulation of beta-2
- B. Stimulation of alpha-1 followed by block of beta-2
- C. Stimulation of beta-1 receptor followed by block of beta-2 receptor
- D. Blocking alpha-1 followed by stimulation of beta-2 (Correct Answer)
Explanation: ***Blocking alpha-1 followed by stimulation of beta-2*** - **Dale's vasomotor reversal** occurs when the typical pressor response to epinephrine is converted to a depressor (vasodilator) response. This phenomenon is demonstrated by first blocking **alpha-1 adrenergic receptors** (e.g., with phenoxybenzamine or phentolamine), and then administering **epinephrine**. - With alpha-1 receptors blocked, epinephrine cannot cause vasoconstriction. Instead, its stimulation of **beta-2 receptors** is unmasked, leading to vasodilation and a drop in blood pressure—the opposite of the usual pressor response. - This is the classic demonstration of Dale's vasomotor reversal in animal models. *Stimulation of alpha-1 followed by stimulation of beta-2* - Simultaneous stimulation of **alpha-1** and **beta-2 receptors** (as occurs with endogenous epinephrine without any blockade) typically results in a net **vasoconstrictor effect** due to the dominance of alpha-1 signaling in most vascular beds. - This scenario represents the normal response to epinephrine, not a reversal phenomenon. *Stimulation of alpha-1 followed by block of beta-2* - Stimulating **alpha-1 receptors** while blocking **beta-2 receptors** would enhance **vasoconstriction**, as the vasodilatory effects of beta-2 activation would be removed. - This would intensify the normal pressor effect, which is opposite to Dale's reversal. *Stimulation of beta-1 receptor followed by block of beta-2 receptor* - Stimulation of **beta-1 receptors** primarily affects the heart (increasing heart rate and contractility), while blocking **beta-2 receptors** would remove peripheral vasodilation. - Neither action directly relates to the **vasomotor reversal phenomenon**, which specifically involves reversing the vascular response to adrenergic agonists from vasoconstriction to vasodilation.
Question 7: The Drug of choice for a pregnant woman in 2nd trimester with pustular psoriasis is:
- A. Prednisolone (Correct Answer)
- B. Acitretin
- C. Methotrexate
- D. Dapsone
Explanation: ***Prednisolone*** - **Systemic corticosteroids** such as prednisolone are considered **safe and effective** for treating severe pustular psoriasis during pregnancy and represent the **best option among the choices provided**. - Pustular psoriasis is a severe systemic condition that can be associated with fever, malaise, and potential complications, necessitating **systemic therapy** rather than topical treatment alone. - While **cyclosporine** is often considered the preferred first-line agent for severe pustular psoriasis in pregnancy in current practice, it is not listed among the options here, making prednisolone the most appropriate choice. - Prednisolone **crosses the placenta minimally** (converted to less active prednisolone by placental 11β-HSD2 enzyme) and has a well-established safety profile in pregnancy. *Acitretin* - **Acitretin** is a systemic **retinoid** that is **highly teratogenic** and can cause severe birth defects including craniofacial, cardiac, thymic, and CNS abnormalities. - It is **absolutely contraindicated in pregnancy** (FDA Category X) and must be avoided for at least 2-3 years before conception due to its long half-life and storage in adipose tissue. *Methotrexate* - **Methotrexate** is an **antimetabolite** and **folate antagonist** that is a potent teratogen, particularly during the first trimester. - It can cause **aminopterin syndrome** (neural tube defects, craniofacial abnormalities, limb defects) and is **absolutely contraindicated in pregnancy** (FDA Category X). - Women on methotrexate must use effective contraception and discontinue the drug at least 3 months before attempting conception. *Dapsone* - **Dapsone** has anti-inflammatory properties and is used in some dermatological conditions, but it is **not indicated for pustular psoriasis**. - Risks in pregnancy include **hemolytic anemia** (particularly in G6PD-deficient individuals), methemoglobinemia in the newborn, and potential neonatal hyperbilirubinemia. - It is **not a first-line or appropriate treatment** for pustular psoriasis in pregnancy.
Question 8: A 35-year-old with migraines needs prophylaxis. Which is suitable?
- A. Acetaminophen
- B. Sumatriptan
- C. Verapamil (Correct Answer)
- D. Tramadol
Explanation: ***Verapamil*** - **Verapamil**, a calcium channel blocker, is often used off-label for **migraine prophylaxis**, particularly in cases where other first-line agents are contraindicated or ineffective. - While not a first-line treatment, it can reduce the frequency and severity of migraine attacks by modulating **vasoconstriction** and **vasodilation**. *Acetaminophen* - **Acetaminophen** is an analgesic used for **acute pain relief**, but it does not have properties that prevent migraine attacks from occurring. - It is unsuitable for long-term **prophylactic management** of migraines. *Sumatriptan* - **Sumatriptan** is a **triptan** medication used for **acute migraine treatment**, meaning it is taken to stop a migraine attack once it has started. - It is not indicated for **migraine prophylaxis** and should not be used regularly to prevent migraines. *Tramadol* - **Tramadol** is an **opioid analgesic** used for moderate to severe pain, and it carries risks of dependence and side effects. - It is not recommended for **migraine prophylaxis** due to its addictive potential and lack of evidence for preventing migraine attacks.
Question 9: The following malformation in a baby due to drug intake by mother is classified as \qquad ADR?
- A. Type A
- B. Type D (Correct Answer)
- C. Type E
- D. Type F
Explanation: ***Type D*** - **Type D** ADRs are **delayed effects** that include **teratogenicity** and **carcinogenicity**, occurring after prolonged exposure or during critical developmental periods. - The image shows **phocomelia** (severe limb malformation), a classic example of drug-induced teratogenicity (e.g., **thalidomide**), which is classified as a Type D ADR. *Type A* - **Type A** ADRs are **augmented** reactions that are predictable, dose-dependent pharmacological effects of drugs. - Examples include **bleeding** with anticoagulants or **hypotension** with antihypertensives, not congenital malformations. *Type E* - **Type E** ADRs are **end-of-use** effects or **withdrawal symptoms** that occur when a drug is discontinued. - These reactions (like **opioid withdrawal**) are unrelated to developmental malformations from in-utero drug exposure. *Type F* - **Type F** is not a recognized category in standard ADR classification systems, which typically include only Types A through E. - The established classification covers predictable, unpredictable, chronic, delayed, and end-of-use effects without requiring a Type F category.
Question 10: Consider the following statements with regard to the treatment of vitamin A deficiency : I. Repeated high doses of retinol can cause liver damage and teratogenicity II. Acute overdose of vitamin A may lead to increased intracranial pressure and skin desquamation III. Regular vitamin A supplementation is also recommended for pregnant women even in countries where vitamin A deficiency is not endemic IV. Excessive intake of carotene may cause harmless orange pigmentation of the skin Which of the statements given above are correct?
- A. II, III and IV
- B. I, II and IV (Correct Answer)
- C. I, II and III
- D. I, III and IV
Explanation: **I, II and IV** - Statement I is correct: Repeated high doses of **retinol** (preformed vitamin A) can accumulate in the liver, leading to **hepatotoxicity** and potential **teratogenic effects** on a developing fetus. - Statement II is correct: **Acute vitamin A overdose** can manifest as symptoms such as **increased intracranial pressure** (pseudotumor cerebri) and **skin desquamation** (peeling skin). - Statement IV is correct: Excessive intake of **carotene** (a vitamin A precursor from plants) can cause **carotenemia**, characterized by a harmless **orange pigmentation** of the skin, but it does not lead to vitamin A toxicity due to regulated conversion. *II, III and IV* - This option incorrectly includes statement III, which is false because regular vitamin A supplementation is generally **not recommended for pregnant women in non-endemic areas** due to the risk of teratogenicity. - The other statements (II and IV) are correct, as acute overdose of vitamin A can cause increased intracranial pressure and skin desquamation, and excessive carotene intake can lead to harmless orange skin pigmentation. *I, II and III* - This option incorrectly includes statement III, which is false as routine vitamin A supplementation is **contraindicated for pregnant women in non-endemic areas** due to the risk of birth defects. - Statements I and II are correct, as high retinol doses can cause liver damage and teratogenicity, and acute vitamin A overdose can lead to increased intracranial pressure and skin desquamation. *I, III and IV* - This option incorrectly includes statement III, which is false because **pregnant women in non-endemic areas should avoid regular vitamin A supplementation** to prevent toxicity and teratogenic effects. - Statements I and IV are correct; high retinol doses can cause liver damage and teratogenicity, and excessive carotene intake can result in harmless orange skin pigmentation.
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