Cardiovascular Drugs Practice Questions

Q: Which of the following drugs does NOT reduce myocardial remodelling in Congestive Heart Failure?

Digoxin. **Explanation:** The goal of modern Heart Failure (HF) management is to block the neurohormonal compensatory mechanisms (Sympathetic and RAAS activation) that lead to **myocardial remodelling**—the structural changes (hypertrophy, fibrosis, and ventricular dilation) that worsen cardiac function over time. **Why Digoxin is the correct answer:** Digoxin is a positive inotropic agent that inhibits the Na+/K+ ATPase pump. While it improves symptoms and reduces the rate of hospitalization by increasing cardiac contractility, it has **no effect on the neurohormonal pathways** responsible for structural remodeling. Consequently, Digoxin does not reduce mortality in heart failure patients. **Analysis of other options:** * **Carvedilol (Beta-blocker):** Blocks the chronic effects of catecholamines, preventing apoptosis and cardiac hypertrophy. Beta-blockers are cornerstones in reducing mortality and reversing remodeling. * **Enalapril (ACE Inhibitor):** Prevents the formation of Angiotensin II, a potent stimulus for myocyte growth and collagen deposition. ACE inhibitors are the first-line agents for preventing remodeling. * **Spironolactone (Mineralocorticoid Receptor Antagonist):** Blocks aldosterone, which is directly responsible for myocardial and vascular fibrosis. It significantly reduces mortality in NYHA Class II-IV heart failure. **High-Yield Clinical Pearls for NEET-PG:** * **Drugs reducing mortality in HF:** ACE inhibitors, ARBs, Beta-blockers (specifically Carvedilol, Metoprolol succinate, Bisoprolol), Aldosterone antagonists, and SGLT2 inhibitors. * **Drugs improving symptoms but NOT mortality:** Digoxin and Diuretics (Furosemide). * **Digoxin Toxicity:** Characterized by gastrointestinal symptoms, xanthopsia (yellow vision), and any arrhythmia (most common: PVCs; most specific: PAT with block).

Q: Which of the following drugs is NOT used to reverse cardiac remodeling in congestive cardiac failure?

Digoxin. **Explanation:** Cardiac remodeling is the structural change in the heart (hypertrophy, fibrosis, and chamber dilation) driven by chronic neurohumoral activation. To reverse or prevent this, a drug must inhibit the **Sympathetic Nervous System (SNS)** or the **Renin-Angiotensin-Aldosterone System (RAAS)**. **Why Digoxin is the correct answer:** Digoxin is a positive inotrope that acts by inhibiting the Na+/K+ ATPase pump. While it improves symptoms and reduces hospitalization rates in heart failure (HF), it has **no effect on cardiac remodeling** and does not reduce mortality. It is primarily used for rate control in patients with concomitant Atrial Fibrillation or for symptomatic relief in refractory HF. **Why the other options are incorrect:** * **ACE Inhibitors (e.g., Enalapril):** These are the gold standard for reversing remodeling. They decrease Angiotensin II levels, reducing fibroblast proliferation and cardiac hypertrophy. * **Beta Blockers (e.g., Carvedilol, Metoprolol):** They counteract the toxic effects of chronic catecholamine exposure, allowing the heart to recover its systolic function over time (reverse remodeling). * **Aldosterone Antagonists (e.g., Spironolactone):** These prevent aldosterone-induced myocardial fibrosis and collagen deposition, significantly reducing mortality in NYHA Class II-IV heart failure. **High-Yield Clinical Pearls for NEET-PG:** 1. **Mortality-Reducing Drugs in HF:** ACEIs, ARBs, Beta-blockers, Aldosterone antagonists, and ARNIs (Sacubitril/Valsartan). 2. **Digoxin Toxicity:** Characterized by xanthopsia (yellow vision) and various arrhythmias; the most characteristic is **Paroxysmal Atrial Tachycardia with AV block**. 3. **ARNI:** Currently considered superior to ACEIs for reversing remodeling in HFrEF.

Q: Which of the following calcium channel blockers is useful in the treatment of supraventricular tachycardia by suppressing AV node conduction?

Verapamil. Explanation: Calcium channel blockers (CCBs) are broadly classified into two categories: **Dihydropyridines (DHPs)** and **Non-Dihydropyridines (Non-DHPs)** [1]. **Why Verapamil is correct:** Verapamil is a Non-DHP CCB with significant **cardioselective** properties. It primarily acts on the L-type calcium channels in the myocardium and the conduction system [3]. By blocking these channels in the **Atrioventricular (AV) node**, it increases the refractory period and slows down conduction velocity (negative dromotropy) [3]. This makes it highly effective for terminating and controlling the ventricular rate in **Supraventricular Tachycardia (SVT)** [3]. **Why the other options are incorrect:** * **Amlodipine and Nifedipine:** These are Dihydropyridines. They are **vasoselective**, acting primarily on smooth muscles of the peripheral blood vessels to cause vasodilation [1]. They have minimal effect on the AV node at clinical doses and may even cause reflex tachycardia, making them unsuitable for arrhythmias [4]. * **Nimodipine:** This is a DHP with high lipid solubility and selectivity for **cerebral blood vessels**. It is specifically used to prevent cerebral vasospasm following subarachnoid hemorrhage, not for cardiac arrhythmias [1]. **High-Yield Clinical Pearls for NEET-PG:** * **Drug of Choice:** Adenosine is the DOC for acute paroxysmal SVT; Verapamil is an alternative [3]. * **Contraindication:** Never give Verapamil in wide-complex tachycardia of unknown origin or in WPW syndrome with Atrial Fibrillation, as it may precipitate ventricular fibrillation [2]. * **Side Effects:** Constipation is the most common side effect of Verapamil [2]. * **Diltiazem:** Another Non-DHP CCB (Benzothiazepine) that acts on both the heart and blood vessels, also used in SVT [3].

Q: Ankle edema caused by calcium channel blockers is prevented by which of the following classes of drugs?

ACE inhibitors. **Explanation:** The ankle edema associated with **Dihydropyridine Calcium Channel Blockers (CCBs)** like Amlodipine is not due to fluid overload, but rather a result of **preferential precapillary (arteriolar) vasodilation**. This increases the hydrostatic pressure in the capillaries, causing fluid to leak into the interstitial space. **1. Why ACE inhibitors are correct:** ACE inhibitors (and ARBs) cause **balanced vasodilation** of both the **precapillary (arteriolar)** and **postcapillary (venular)** vessels. By dilating the venules, ACE inhibitors reduce the hydrostatic pressure gradient in the capillary bed, thereby facilitating the reabsorption of fluid back into the vascular compartment and neutralizing the edema caused by CCBs. **2. Why other options are incorrect:** * **Propranolol:** This is a non-selective beta-blocker. While it can be used to treat reflex tachycardia caused by CCBs, it has no significant effect on postcapillary venodilation and does not prevent peripheral edema. * **Adrenaline:** This is a sympathomimetic. It would likely worsen cardiovascular parameters and has no role in managing drug-induced edema. * **Ropinirole:** This is a dopamine agonist used in Parkinson’s disease and Restless Leg Syndrome. Interestingly, Ropinirole itself is known to *cause* peripheral edema as a side effect. **Clinical Pearls for NEET-PG:** * **Mechanism:** CCB-induced edema is "non-pitting" and does not respond to diuretics (like Furosemide) because the total body sodium/water is normal. * **Combination Therapy:** The combination of a CCB and an ACE inhibitor is a "high-yield" clinical strategy because it provides synergistic BP lowering while minimizing the side effect of edema. * **Other CCB side effects:** Gingival hyperplasia, reflex tachycardia (with DHPs), and constipation (specifically Verapamil).

Q: What is the drug of choice for maintenance in paroxysmal supraventricular tachycardia (PSVT)?

Adenosine. **Explanation:** **Adenosine** is the drug of choice for the **acute termination** of Paroxysmal Supraventricular Tachycardia (PSVT). Its mechanism involves the activation of $A_1$ receptors on the AV node, which increases potassium efflux and inhibits calcium influx. This leads to profound hyperpolarization and a transient "chemical cardioversion" by slowing conduction through the AV node, effectively breaking the re-entrant circuit. **Analysis of Options:** * **Adenosine (Correct):** It has an ultra-short half-life (<10 seconds), making it ideal for rapid termination of PSVT with minimal systemic side effects. * **Amiodarone:** A Class III antiarrhythmic used primarily for ventricular arrhythmias and atrial fibrillation. It is not the first-line choice for PSVT due to its slow onset and extensive side-effect profile. * **Lignocaine:** A Class IB sodium channel blocker. It is effective only for **ventricular arrhythmias** (post-MI) and has no efficacy in supraventricular arrhythmias like PSVT. * **Verapamil:** A Calcium Channel Blocker (Class IV). While it can be used for PSVT, it is considered a second-line agent compared to Adenosine because it causes more prolonged hypotension and has a slower onset of action. **High-Yield Clinical Pearls for NEET-PG:** * **Administration:** Adenosine must be given as a **rapid IV bolus** (usually 6mg followed by 12mg) through a large-bore peripheral vein, followed by a saline flush, due to its rapid metabolism by erythrocytes and vascular endothelial cells. * **Contraindications:** Avoid in patients with **Asthma** (may cause bronchospasm) and **High-degree AV block**. * **Drug Interactions:** The effects of Adenosine are **potentiated by Dipyridamole** and **antagonized by Theophylline/Caffeine** (adenosine receptor blockers). * **Side Effects:** Patients often experience a transient sense of "impending doom," chest pain, or flushing.

Q: All of the following drugs belong to Class 1 antiarrhythmic drugs except?

Propanolol. **Explanation:** The classification of antiarrhythmic drugs is based on the **Vaughan Williams Classification**, which categorizes drugs according to their primary mechanism of action on the cardiac action potential. **Why Propranolol is the correct answer:** Propranolol is a non-selective beta-adrenergic blocker. According to the Vaughan Williams classification, beta-blockers belong to **Class II**. They work by inhibiting sympathetic stimulation, decreasing the slope of Phase 4 depolarization in pacemaker cells (SA and AV nodes), thereby reducing heart rate and conduction velocity. **Analysis of Incorrect Options (Class I Drugs):** Class I drugs are primarily **Sodium (Na+) channel blockers** that decrease the rate of Phase 0 depolarization. They are subdivided into three groups: * **Option A (Quinidine) & Option B (Procainamide):** These belong to **Class IA**. They moderately block Na+ channels and also block K+ channels, which prolongs the action potential duration (APD) and the QT interval. * **Option C (Flecainide):** This belongs to **Class IC**. It is a potent Na+ channel blocker with minimal effect on APD. It significantly slows conduction and is used for supraventricular arrhythmias in patients without structural heart disease. **High-Yield NEET-PG Pearls:** * **Class IB (e.g., Lidocaine, Mexiletine):** These shorten the APD and are specifically effective for ventricular arrhythmias, especially post-Myocardial Infarction. * **Class III (e.g., Amiodarone, Sotalol):** These are Potassium (K+) channel blockers that prolong Phase 3 repolarization. * **Class IV (e.g., Verapamil, Diltiazem):** These are Calcium (Ca2+) channel blockers. * **Mnemonic for Class I:** "**D**ouble **Q**uarter **P**ounder, **L**ettuce **M**ayo **T**omato, **F**ries **P**lease" (**IA:** **D**isopyramide, **Q**uinidine, **P**rocainamide; **IB:** **L**idocaine, **M**exiletine, **T**ocainide; **IC:** **F**lecainide, **P**ropafenone).

Q: The antianginal effect of propranolol may be attributed to which of the following?

Block of exercise-induced tachycardia. **Explanation:** The primary goal in treating stable angina is to restore the balance between myocardial oxygen supply and demand. Propranolol, a non-selective beta-blocker, achieves this primarily by **reducing myocardial oxygen demand**. **1. Why Option A is Correct:** The most significant determinant of myocardial oxygen consumption during exertion is the heart rate. Propranolol blocks $\beta_1$ receptors in the SA node, effectively **blocking exercise-induced tachycardia**. By preventing the heart rate from rising during physical activity, it reduces the workload of the heart. Additionally, a slower heart rate increases the duration of **diastole**, which is the period when coronary perfusion occurs, thereby marginally improving oxygen supply. **2. Why the Other Options are Incorrect:** * **Option B:** Propranolol causes **vasoconstriction**, not dilation, of coronary vessels. By blocking $\beta_2$ receptors (which mediate vasodilation), it leaves $\alpha$-mediated vasoconstriction unopposed. This is why beta-blockers are contraindicated in Vasospastic (Prinzmetal) angina. * **Option C:** Propranolol has a **negative inotropic effect** (decreases cardiac force). While this helps reduce oxygen demand, the option states "increased force," which is physiologically opposite to the drug's action. * **Option D:** Propranolol **decreases** resting heart rate (negative chronotropy); it does not increase it. **Clinical Pearls for NEET-PG:** * **DOC for Stable Angina:** Beta-blockers are the first-line maintenance therapy. * **Contraindication:** Never use Propranolol in **Prinzmetal Angina** (use Calcium Channel Blockers instead) or in patients with **Asthma/COPD** (due to $\beta_2$ blockade causing bronchospasm). * **Withdrawal:** Abrupt cessation can lead to "Rebound Hypertension" or MI due to up-regulation of beta-receptors.

Q: Which of the following drugs has the maximum half-life?

Amiodarone. **Explanation:** The correct answer is **Amiodarone**. The concept being tested here is the pharmacokinetic profile of antiarrhythmic drugs, specifically their elimination half-lives. **1. Why Amiodarone is correct:** Amiodarone (a Class III antiarrhythmic) is highly **lipophilic** and sequesters extensively into tissues like adipose, liver, and lungs. It has a massive volume of distribution ($V_d$). Consequently, it has an exceptionally long elimination half-life, typically ranging from **25 to 60 days** (average ~58 days). This necessitates a "loading dose" to achieve steady-state plasma concentrations quickly. **2. Why the other options are incorrect:** * **Adenosine:** Has the shortest half-life in clinical medicine, lasting **less than 10 seconds** due to rapid uptake by erythrocytes and endothelial cells. It is administered as a rapid IV bolus for PSVT. * **Esmolol:** An ultra-short-acting Class II beta-blocker. It is metabolized by **red blood cell esterases**, giving it a half-life of approximately **9 minutes**. It is ideal for perioperative arrhythmia control. * **Lidocaine:** A Class Ib antiarrhythmic with a half-life of about **1.5 to 2 hours**. It undergoes extensive first-pass metabolism in the liver. **High-Yield Clinical Pearls for NEET-PG:** * **Amiodarone Toxicity:** Due to its long half-life, side effects (pulmonary fibrosis, thyroid dysfunction, corneal microdeposits, and blue-gray skin discoloration) can persist long after the drug is discontinued. * **Iodine Content:** Amiodarone is structurally related to thyroxine and contains roughly 37% iodine by weight. * **Drug of Choice:** Amiodarone is the preferred drug for rhythm control in patients with structural heart disease or heart failure.

Q: Which drug is NOT useful in congestive heart failure?

Adrenaline. **Explanation:** In Congestive Heart Failure (CHF), the primary goal is to improve cardiac output while reducing the workload on an already failing heart. **Why Adrenaline (Option A) is the correct answer:** Adrenaline is a potent non-selective alpha and beta-adrenergic agonist. While it increases myocardial contractility (positive inotropy), it significantly increases heart rate (positive chronotropy) and peripheral vascular resistance. This leads to a massive increase in **myocardial oxygen demand** and **afterload**, which can precipitate arrhythmias and worsen myocardial ischemia in a failing heart. Therefore, it has no role in the long-term management of CHF. **Why the other options are used in CHF:** * **Digoxin (Option B):** A cardiac glycoside that inhibits the Na+/K+ ATPase pump, increasing intracellular calcium. It provides **positive inotropic** support and controls heart rate (especially in patients with concomitant Atrial Fibrillation). * **Hydrochlorothiazide (Option C):** A thiazide diuretic used to reduce fluid overload (preload), thereby relieving symptoms of pulmonary and peripheral edema. * **Enalapril (Option D):** An ACE inhibitor that is a cornerstone of CHF therapy. It reduces both **preload and afterload** and, most importantly, inhibits cardiac remodeling, which reduces mortality. **High-Yield Clinical Pearls for NEET-PG:** * **Mortality Benefit:** ACE inhibitors (Enalapril), Beta-blockers (Carvedilol, Metoprolol), Spironolactone, and ARNIs (Sacubitril/Valsartan) are proven to decrease mortality in CHF. * **Symptomatic Relief Only:** Digoxin and Diuretics improve symptoms and reduce hospitalizations but do **not** decrease mortality. * **Inotropic Support:** For acute decompensated heart failure, **Dobutamine** or **Milrinone** are preferred over Adrenaline as they are less likely to cause extreme tachycardia and vasoconstriction.

Question 1

Which of the following drugs does NOT reduce myocardial remodelling in Congestive Heart Failure?

Accepted Answer

Digoxin

Answer

Carvedilol

Answer

Enalapril

Answer

Spironolactone

Question 2

Which of the following drugs is NOT used to reverse cardiac remodeling in congestive cardiac failure?

Accepted Answer

Digoxin

Answer

Beta blocker

Answer

ACE inhibitor

Answer

Aldosterone antagonist

Question 3

Which of the following calcium channel blockers is useful in the treatment of supraventricular tachycardia by suppressing AV node conduction?

Accepted Answer

Verapamil

Answer

Amlodipine

Answer

Nimodipine

Answer

Nifedipine

Question 4

Ankle edema caused by calcium channel blockers is prevented by which of the following classes of drugs?

Accepted Answer

ACE inhibitors

Answer

Propranolol

Answer

Adrenaline

Answer

Ropinirole

Question 5

What is the drug of choice for acute left ventricular failure?

Accepted Answer

Intravenous Furosemide

Answer

Rapid digitalization

Answer

Intravenous Aminophylline

Answer

Intravenous Morphine

Question 6

What is the drug of choice for maintenance in paroxysmal supraventricular tachycardia (PSVT)?

Accepted Answer

Adenosine

Answer

Amiodarone

Answer

Lignocaine

Answer

Verapamil

Question 7

All of the following drugs belong to Class 1 antiarrhythmic drugs except?

Accepted Answer

Propanolol

Answer

Quinidine

Answer

Procainamide

Answer

Flecainide

Question 8

The antianginal effect of propranolol may be attributed to which of the following?

Accepted Answer

Block of exercise-induced tachycardia

Answer

Dilation of constricted coronary vessels

Answer

Increased cardiac force

Answer

Increased resting heart rate

Question 9

Which of the following drugs has the maximum half-life?

Accepted Answer

Amiodarone

Answer

Adenosine

Answer

Esmolol

Answer

Lidocaine

Question 10

Which drug is NOT useful in congestive heart failure?

Accepted Answer

Adrenaline

Answer

Digoxin

Answer

Hydrochlorothiazide

Answer

Enalapril

Cardiovascular Drugs — MCQs

Cardiovascular Drugs — MCQs

On this page

Practice by Chapter

Want unlimited practice?