Cardiovascular Drugs Practice Questions

Q: Prolonged use of hydralazine for the treatment of hypertension is likely to cause:

Lupus erythematosis. **Explanation:** **Hydralazine** is a direct-acting arterial vasodilator used in hypertensive emergencies and chronic heart failure. The correct answer is **Lupus erythematosus**, specifically **Drug-Induced Lupus Erythematosus (DILE)**. 1. **Why D is correct:** Hydralazine is metabolized in the liver via **N-acetylation**. In individuals who are **"slow acetylators"** (genetically deficient in N-acetyltransferase), the drug or its metabolites can accumulate and bind to nuclear proteins. This triggers the formation of antinuclear antibodies (ANA), leading to a clinical syndrome resembling Systemic Lupus Erythematosus (SLE), characterized by arthralgia, fever, and pleuritis. Notably, unlike idiopathic SLE, DILE rarely involves the kidneys or CNS and typically resolves upon drug discontinuation. 2. **Why other options are incorrect:** * **A. Gynaecomastia:** Commonly associated with Spironolactone, Digoxin, Cimetidine, or Ketoconazole ("DISCO" mnemonic), but not Hydralazine. * **B. Thrombocytopenia:** While many drugs cause marrow suppression, it is not a classic or high-yield side effect of Hydralazine. * **C. Hemolytic anemia:** Classically associated with **Methyldopa** (Coombs-positive hemolytic anemia), not Hydralazine. **High-Yield Clinical Pearls for NEET-PG:** * **DILE Markers:** The most specific screening marker for DILE is **Anti-histone antibodies** (positive in >95% of cases). * **Common Culprits of DILE:** Remember the mnemonic **"SHIP"**: **S**ulfonamides/Sulfasalazine, **H**ydralazine, **I**soniazid, and **P**rocainamide (Procainamide has the highest risk). * **Reflex Tachycardia:** Hydralazine causes significant reflex tachycardia and fluid retention; therefore, it is almost always co-administered with a **Beta-blocker** and a **Diuretic**.

Q: Which of the following is NOT an adverse effect of ACE inhibitors?

Ankle edema. **Explanation:** The correct answer is **D. Ankle edema**. ACE inhibitors (ACEIs) prevent the conversion of Angiotensin I to Angiotensin II. While they have several characteristic side effects, **ankle edema** is not one of them. Instead, ankle edema is a classic adverse effect of **Dihydropyridine Calcium Channel Blockers (CCBs)** like Amlodipine, caused by preferential precapillary vasodilation leading to increased hydrostatic pressure. **Why the other options are incorrect:** * **A. Persistent cough:** This is the most common side effect of ACEIs (occurring in 5-20% of patients) [1]. It is caused by the accumulation of **Bradykinin** and **Substance P** in the lungs, which sensitizes cough receptors [1]. * **B. Taste alteration (Dysgeusia):** This is specifically associated with **Captopril**, likely due to the presence of a sulfhydryl group in its chemical structure. * **C. Angioedema:** A rare but life-threatening side effect. It is also mediated by increased levels of **Bradykinin**, leading to rapid swelling of the lips, tongue, and airway. **High-Yield Clinical Pearls for NEET-PG:** * **Mnemonic for ACEI side effects (CAPTOPRIL):** **C**ough, **A**ngioedema, **P**otassium excess (Hyperkalemia), **T**aste changes, **O**rthostatic hypotension, **P**regnancy contraindication (Teratogenic), **R**enal artery stenosis (contraindicated in bilateral), **I**ncreased renin, **L**eukopenia [1], [2]. * **Switching Therapy:** If a patient develops a cough on ACEIs, the next best step is to switch to an **Angiotensin Receptor Blocker (ARB)**, as ARBs do not affect bradykinin metabolism [1]. * **Teratogenicity:** ACEIs are contraindicated in pregnancy because they cause **fetal renal dysgenesis** and skull hypoplasia [2].

Q: All the following agents may be used for the management of hypertensive crisis EXCEPT?

Indapamide. ### Explanation The management of a **hypertensive crisis** (Urgency or Emergency) requires rapidly acting, intravenous medications to achieve controlled reduction of blood pressure. **Why Indapamide is the Correct Answer:** Indapamide is a **thiazide-like diuretic** administered exclusively via the **oral route**. It has a slow onset of action and a prolonged duration, making it suitable for the long-term maintenance treatment of essential hypertension, but entirely **ineffective and inappropriate** for the acute, rapid stabilization required in a hypertensive crisis. **Analysis of Incorrect Options:** * **Furosemide (Option A):** A potent loop diuretic that can be given IV. It is specifically indicated in hypertensive emergencies complicated by **acute heart failure or pulmonary edema** to reduce fluid overload. * **Nitroglycerin (Option B):** A venodilator (and coronary vasodilator) given as a continuous IV infusion. It is the drug of choice for hypertensive crises associated with **acute coronary syndrome (ACS)** or acute heart failure. * **Esmolol (Option D):** An ultra-short-acting, cardioselective **beta-blocker** given IV. Due to its rapid onset and very short half-life (~9 minutes), it is ideal for managing hypertension associated with **aortic dissection** or perioperative settings. **High-Yield Clinical Pearls for NEET-PG:** * **Drug of Choice (DOC):** **Sodium Nitroprusside** was traditionally the DOC, but **Labetalol** or **Nicardipine** are now preferred due to better safety profiles. * **Aortic Dissection:** Use Esmolol or Labetalol (Goal: SBP <120 mmHg within 20 mins). * **Pheochromocytoma:** Use Phentolamine (Alpha-blocker). * **Neurological Crisis:** Avoid rapid BP drops to prevent cerebral ischemia; aim for a 20-25% reduction in the first hour.

Q: The side effect of corneal microdeposits is seen most commonly with which of the following drugs?

Amiodarone. **Explanation:** **Amiodarone** is a Class III antiarrhythmic drug known for its extensive side-effect profile due to its high lipid solubility and long half-life. **Corneal microdeposits** (also known as *vortex keratopathy* or *cornea verticillata*) occur in nearly **90-100% of patients** on long-term amiodarone therapy. These deposits are yellowish-brown, bilateral, and located in the basal epithelium. While they are a hallmark side effect, they are usually asymptomatic and rarely necessitate drug discontinuation. **Analysis of Options:** * **A. Esmolol:** An ultra-short-acting cardioselective Beta-1 blocker used for acute supraventricular arrhythmias. Its primary side effect is hypotension; it has no ocular toxicity. * **C. Adenosine:** A drug of choice for Paroxysmal Supraventricular Tachycardia (PSVT). It has an extremely short half-life (<10 seconds) and causes transient side effects like flushing, chest pain, and dyspnea. * **D. Bretylium:** An older Class III agent used for refractory ventricular fibrillation. Its main side effect is orthostatic hypotension. **High-Yield Clinical Pearls for NEET-PG:** * **Mechanism:** Amiodarone blocks K+ channels (primary), but also Na+, Ca2+ channels, and alpha/beta-adrenergic receptors. * **Ocular Effects:** Besides corneal deposits, it can rarely cause **Optic Neuritis**, which requires immediate drug cessation. * **Other Key Side Effects:** * **Pulmonary:** Pulmonary fibrosis (most serious). * **Thyroid:** Hypothyroidism or Hyperthyroidism (due to high iodine content). * **Skin:** Blue-gray skin discoloration (Smurf skin). * **Liver:** Elevated transaminases/Hepatotoxicity. * **Monitoring:** Baseline and periodic Chest X-ray, PFTs, Thyroid Function Tests (TFTs), and LFTs are essential.

Q: What is the drug of choice for pregnancy-induced hypertension?

Alpha-methyldopa. **Explanation:** **Alpha-methyldopa** is the traditional drug of choice for chronic hypertension in pregnancy. It is a centrally acting alpha-2 adrenergic agonist that reduces sympathetic outflow. Its preference in pregnancy stems from its long-standing safety profile and the absence of long-term adverse effects on fetal development or neonatal hemodynamics. **Analysis of Options:** * **Atenolol (Option A):** Beta-blockers, particularly Atenolol, are generally avoided in early pregnancy as they are associated with **fetal growth restriction (IUGR)** and placental complications. * **Nitroprusside (Option B):** It is contraindicated in pregnancy (except in extreme emergencies) due to the risk of **fetal cyanide poisoning**. * **Enalapril (Option C):** ACE inhibitors and ARBs are strictly **contraindicated** in pregnancy. They are teratogenic and can cause fetal renal dysgenesis, oligohydramnios, and skull hypoplasia. **High-Yield Clinical Pearls for NEET-PG:** * **First-line agents:** While Methyldopa is the classic answer, current guidelines (like ACOG) also recommend **Labetalol** (often preferred for its faster onset) and **Nifedipine** (long-acting) as first-line options. * **Acute Hypertensive Crisis in Pregnancy:** The drugs of choice are **IV Labetalol** or **IV Hydralazine**. * **Preeclampsia Prophylaxis:** Low-dose **Aspirin** (started before 16 weeks) is used in high-risk patients. * **Magnesium Sulfate ($MgSO_4$):** This is the drug of choice for preventing and treating seizures in **Eclampsia**, not for blood pressure control.

Q: Which drug prescribed by the physician would most probably be responsible for this condition?

Amiodarone. ***Amiodarone*** - **Amiodarone-induced pulmonary toxicity** is a well-known adverse effect, presenting with bilateral **pulmonary infiltrates** on chest X-ray and progressive dyspnea. - The drug accumulates in **lung tissue** due to its lipophilic nature and long half-life, causing **inflammatory pneumonitis** and potentially **pulmonary fibrosis**. *Digoxin* - Primarily causes **cardiac toxicity** including arrhythmias, heart block, and **digitalis toxicity** symptoms like nausea and visual disturbances. - Does not cause **pulmonary infiltrates** or lung parenchymal damage as its main mechanism involves **Na+/K+-ATPase inhibition**. *Verapamil* - A **calcium channel blocker** that primarily affects the cardiovascular system, causing **bradycardia**, **hypotension**, and potential **heart block**. - **Pulmonary toxicity** is not a recognized adverse effect of verapamil therapy. *Propranolol* - A **non-selective beta-blocker** that can cause **bronchospasm** in asthmatic patients but does not cause **pulmonary infiltrates**. - Main side effects include **bradycardia**, **hypotension**, and **fatigue**, not parenchymal lung disease.

Q: Enhancement of the effects of bradykinin is most likely to occur with which of the following drugs?

Lisinopril. **Explanation:** The correct answer is **Lisinopril**. **1. Mechanism of Action (Why Lisinopril is correct):** Lisinopril is an **ACE Inhibitor (ACEI)**. The Angiotensin-Converting Enzyme (ACE) is identical to **Kininase II**, the enzyme responsible for the degradation of bradykinin into inactive peptides. By inhibiting ACE, these drugs prevent the breakdown of bradykinin, leading to its accumulation in the tissues and blood. Increased bradykinin levels contribute to vasodilation but are also responsible for the classic side effects of ACEIs, such as a dry cough and angioedema. **2. Analysis of Incorrect Options:** * **Clonidine:** An alpha-2 adrenergic agonist that acts centrally to reduce sympathetic outflow. It has no effect on the kinin system. * **Diazoxide:** A potassium channel opener used in hypertensive emergencies and insulinomas. It acts directly on vascular smooth muscle and does not involve bradykinin. * **Losartan:** An **Angiotensin Receptor Blocker (ARB)**. Unlike ACEIs, ARBs block the $AT_1$ receptor directly and do not inhibit Kininase II. Therefore, they do not increase bradykinin levels, making them the preferred alternative for patients who develop a cough on ACEIs. **3. NEET-PG High-Yield Pearls:** * **The "Cough" Connection:** The accumulation of bradykinin and substance P in the lungs is the primary cause of the dry, non-productive cough seen in ~10-15% of patients on ACEIs. * **Angioedema:** This is a rare but life-threatening side effect also mediated by excessive bradykinin levels. * **Dual Benefit:** While bradykinin causes side effects, it also contributes to the antihypertensive efficacy of ACEIs by stimulating the release of nitric oxide and prostacyclin ($PGI_2$).

Q: What is the drug of choice for cardiogenic shock?

Dobutamine. **Explanation:** **Dobutamine** is the drug of choice for cardiogenic shock because it is a potent **selective $\beta_1$-adrenergic agonist**. In cardiogenic shock, the primary pathology is pump failure; Dobutamine increases myocardial contractility (**positive inotropy**) and heart rate (**positive chronotropy**) with minimal effect on blood pressure. It also causes mild peripheral vasodilation ($\beta_2$ effect), which reduces afterload, further assisting the failing heart in maintaining cardiac output. **Analysis of Incorrect Options:** * **Dopamine (Option A):** Historically used, but now second-line. At high doses, it causes significant vasoconstriction and tachycardia, which increases myocardial oxygen demand, potentially worsening ischemia in a failing heart. * **Droxidopa (Option C):** A synthetic amino acid precursor of norepinephrine used primarily for neurogenic orthostatic hypotension, not for acute shock management. * **Noradrenaline (Option D):** While it is the drug of choice for **septic shock**, its potent $\alpha_1$ vasoconstrictive properties increase afterload, which can be detrimental in pure cardiogenic shock unless there is also profound hypotension. **High-Yield Clinical Pearls for NEET-PG:** * **Drug of Choice (DOC) Summary:** * Septic/Hypovolemic Shock: Noradrenaline. * Anaphylactic Shock: Adrenaline (1:1000 IM). * Cardiogenic Shock: Dobutamine. * **Mechanism:** Dobutamine acts primarily on $\beta_1$ receptors. It is often preferred over Dopamine because it carries a lower risk of inducing arrhythmias. * **Monitoring:** Always monitor for tachycardia and arrhythmias when administering inotropic agents.

Question 1

Prolonged use of hydralazine for the treatment of hypertension is likely to cause:

Accepted Answer

Lupus erythematosis

Answer

Gynaecomastia

Answer

Thrombocytopenia

Answer

Hemolytic anemia

Question 2

Which of the following is NOT an adverse effect of ACE inhibitors?

Accepted Answer

Ankle edema

Answer

Persistent cough

Answer

Taste alteration

Answer

Angioedema

Question 3

Which of the following is a true statement about Endothelin-1, a potent vasoconstrictor?

Accepted Answer

Produced in increased amounts in Pulmonary Arterial Hypertension

Answer

Used in hypertension treatment

Answer

Dilates vascular smooth muscle cells

Answer

Safely indicated in liver injury

Question 4

All the following agents may be used for the management of hypertensive crisis EXCEPT?

Accepted Answer

Indapamide

Answer

Furosemide

Answer

Nitroglycerin

Answer

Esmolol

Question 5

All are true about ranolazine except?

Accepted Answer

It causes hypotension

Answer

It is recommended as first-line treatment for angina

Answer

It improves glycemic control

Answer

It is not indicated for acute attack of angina

Question 6

The side effect of corneal microdeposits is seen most commonly with which of the following drugs?

Accepted Answer

Amiodarone

Answer

Esmolol

Answer

Adenosine

Answer

Bretylium

Question 7

What is the drug of choice for pregnancy-induced hypertension?

Accepted Answer

Alpha-methyldopa

Answer

Atenolol

Answer

Nitroprusside

Answer

Enalapril

Question 8

Which drug prescribed by the physician would most probably be responsible for this condition?

Accepted Answer

Amiodarone

Answer

Digoxin

Answer

Verapamil

Answer

Propranolol

Question 9

Enhancement of the effects of bradykinin is most likely to occur with which of the following drugs?

Accepted Answer

Lisinopril

Answer

Clonidine

Answer

Diazoxide

Answer

Losartan

Question 10

What is the drug of choice for cardiogenic shock?

Accepted Answer

Dobutamine

Answer

Dopamine

Answer

Droxidopa

Answer

Noradrenaline

Cardiovascular Drugs — MCQs

Cardiovascular Drugs — MCQs

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