Cardiovascular Drugs Practice Questions

Q: Nesiritide causes vasodilation through?

Guanosine 3',5'-cyclic monophosphate (cGMP). ***Guanosine 3',5'-cyclic monophosphate (cGMP)*** - **Nesiritide** is a synthetic **B-type natriuretic peptide (BNP)** that acts as a potent vasodilator [2]. - It works by binding to **guanylyl cyclase receptors**, leading to an increase in intracellular **cGMP**, which promotes smooth muscle relaxation [1], [2]. *Cyclic adenosine monophosphate (cAMP)* - While **cAMP** is a crucial second messenger in various cellular processes and can mediate some forms of vasodilation, it is primarily associated with **beta-adrenergic receptor activation**, not the mechanism of action of nesiritide. - Nesiritide's pathway is distinct from those involving **cAMP-mediated** relaxation, which often involves different kinases and protein phosphorylation. *ATP* - **ATP** (adenosine triphosphate) is the primary **energy currency** of the cell and is involved in numerous cellular functions, including muscle contraction and relaxation, but it is not a direct mediator of nesiritide's vasodilatory effects. - Though ATP can be broken down to produce **adenosine**, which has vasodilatory properties, this is not the specific mechanism through which nesiritide causes vasodilation. *K+ ions* - Changes in **potassium ion (K+)** flux across cell membranes are essential for regulating vascular tone, as K+ channel activation can lead to hyperpolarization and relaxation of smooth muscle. - However, **nesiritide's primary mechanism** of action does not involve direct modulation of K+ channels; its vasodilatory effects are mediated by the **cGMP pathway** [2].

Q: Which of the following is a mineralocorticoid antagonist?

Spironolactone. ***Spironolactone*** - **Spironolactone** is a **potassium-sparing diuretic** that acts as a competitive antagonist of **aldosterone** at the mineralocorticoid receptors in the renal tubules [1], [2]. - Its primary use is in conditions like **heart failure**, **cirrhosis with ascites**, and **primary hyperaldosteronism** (Conn's syndrome) [2]. *Inamrinone* - **Inamrinone** is a **phosphodiesterase-3 inhibitor** (PDE3 inhibitor) and is classified as an **inotropic agent**. - It increases **intracellular cAMP** in cardiac cells, leading to increased **contractility** and **vasodilation**, and is used in severe heart failure. *Nicorandil* - **Nicorandil** is a **potassium channel opener** and a **nitrate-like drug** that causes both venous and arterial vasodilation. - It is primarily used as an **antianginal agent** due to its ability to reduce cardiac workload and improve coronary blood flow. *Ketorolac* - **Ketorolac** is a **nonsteroidal anti-inflammatory drug (NSAID)** that primarily inhibits **cyclooxygenase (COX) enzymes**. - It is used for **short-term management of acute moderate to severe pain** and has no direct activity on mineralocorticoid receptors.

Q: What is the drug of choice for a classical angina attack?

GTN. ***GTN*** - **Glyceryl trinitrate (GTN)** is the drug of choice for immediate relief of a classical angina attack because it rapidly dilates coronary arteries and peripheral blood vessels, reducing **myocardial oxygen demand** and improving blood flow [2]. - Its **nitric oxide** mediated vasodilatory effects quickly alleviate chest pain by decreasing **preload** and afterload [2], [3]. *CCBs* - **Calcium channel blockers (CCBs)** are used for long-term prevention of angina by reducing myocardial oxygen demand, but they are not the first-line treatment for acute relief due to their slower onset of action [1]. - While they can dilate coronary arteries and reduce heart rate/contractility, their role is more in **prophylaxis** rather than acute symptom management [1]. *β-blocker* - **Beta-blockers** are primarily used for chronic management and prevention of angina by reducing heart rate, contractility, and blood pressure, thereby decreasing myocardial oxygen demand. - They are generally avoided for acute angina attacks as they do not provide rapid symptomatic relief and can potentially worsen symptoms in some acute ischemic conditions. *Prazocin* - **Prazosin** is an **alpha-1 adrenergic blocker** primarily used to treat hypertension and benign prostatic hyperplasia. - It causes vasodilation but is not indicated for the treatment of acute angina, as its mechanism of action and onset of effect are not suitable for rapid relief of myocardial ischemia.

Q: Which of the following is a renin inhibitor?

Remikiren. **Remikiren** - **Remikiren** is a direct **renin inhibitor** that acts by binding to the active site of renin, preventing its interaction with angiotensinogen. - This inhibition reduces the formation of **angiotensin I** and subsequently **angiotensin II**, leading to decreased blood pressure. *Losartan* - **Losartan** is an **Angiotensin II Receptor Blocker (ARB)**, meaning it blocks AT1 receptors, preventing angiotensin II from binding. - It does not inhibit renin activity directly but rather acts downstream in the **renin-angiotensin-aldosterone system (RAAS)**. *Benazepril* - **Benazepril** is an **Angiotensin-Converting Enzyme (ACE) inhibitor**, which blocks the enzyme responsible for converting **angiotensin I** to **angiotensin II**. - It does not directly inhibit renin production or activity. *Imidapril* - **Imidapril** is also an **Angiotensin-Converting Enzyme (ACE) inhibitor**, similar to benazepril. - Its mechanism of action involves inhibiting ACE, thereby reducing **angiotensin II** levels, rather than directly inhibiting renin.

Q: Which of the following medications is most likely to cause reflex tachycardia?

Nifedipine. ***Nifedipine*** - Nifedipine is a **dihydropyridine calcium channel blocker** that causes significant peripheral vasodilation, leading to a rapid drop in blood pressure. - This sudden drop in blood pressure triggers a **baroreflex response**, compensatory increase in heart rate. *Verapamil* - Verapamil is a **non-dihydropyridine calcium channel blocker** that primarily acts on the cardiac pacemaker cells and slows AV nodal conduction. - While it can cause vasodilation, its direct negative chronotropic effect on the heart often **blunts or prevents reflex tachycardia**. *Propranolol* - Propranolol is a **non-selective beta-blocker** that blocks beta-1 and beta-2 adrenergic receptors. - It directly **decreases heart rate and myocardial contractility**, thereby preventing reflex tachycardia. *Amlodipine* - Amlodipine is a **dihydropyridine calcium channel blocker**, similar to nifedipine, but it has a **slower onset of action and a longer half-life**. - Its more gradual onset of vasodilation often results in a significantly **less pronounced or absent reflex tachycardia** compared to nifedipine.

Q: Which of the following is a second-generation beta blocker?

Atenolol. ***Atenolol*** - **Atenolol** is a **second-generation beta blocker** characterized by its **cardioselectivity**, meaning it primarily blocks beta-1 receptors in the heart. - This selectively reduces heart rate and contractility with fewer respiratory side effects compared to non-selective agents. *Propranolol* - **Propranolol** is a **first-generation non-selective beta blocker**, meaning it blocks both beta-1 and beta-2 adrenergic receptors. - Its non-selective action can cause significant bronchoconstriction, making it less suitable for patients with respiratory conditions. *Timolol* - **Timolol** is also a **first-generation non-selective beta blocker** commonly used in ophthalmic preparations for glaucoma. - It blocks both beta-1 and beta-2 receptors and does not possess the cardioselectivity of second-generation agents. *Nadolol* - **Nadolol** is another **first-generation non-selective beta blocker** with a long duration of action due to its extensive plasma half-life. - Like other first-generation agents, it lacks cardioselectivity and blocks both beta-1 and beta-2 receptors.

Q: Which beta-1 antagonist is used in congestive cardiac failure?

Metoprolol. ***Metoprolol*** - **Metoprolol succinate** (extended-release formulation) is a selective **beta-1 antagonist** proven to reduce mortality and hospitalizations in **chronic heart failure with reduced ejection fraction (HFrEF)**. - It works by **reducing heart rate, myocardial oxygen demand**, and preventing adverse cardiac remodeling through inhibition of chronic sympathetic activation. - Along with **bisoprolol and carvedilol**, it is one of the **three beta-blockers with proven mortality benefit** in heart failure trials. *Atenolol* - While atenolol is a selective beta-1 antagonist, it **lacks evidence for mortality benefit** in heart failure. - It has **high hydrophilicity** and renal elimination, leading to less favorable pharmacokinetics compared to metoprolol. - More commonly used for **hypertension and angina** rather than heart failure management. *Esmolol* - **Esmolol** is an ultra-short-acting selective beta-1 antagonist used for **acute control of heart rate** in perioperative and critical care settings. - Its **very short half-life (9 minutes)** makes it unsuitable for chronic management of heart failure. - Administered only **intravenously** and requires continuous infusion. *Bisoprolol* - While **bisoprolol is also approved** for heart failure and has proven mortality benefit (CIBIS-II trial), this question likely expects **metoprolol** as the answer given the historical context. - Both bisoprolol and metoprolol are acceptable answers, but **metoprolol** has been more widely studied and is more commonly cited in Indian medical exams. - Bisoprolol has **greater beta-1 selectivity** than metoprolol but similar clinical outcomes in heart failure.

Q: Which of the following is not a cardioselective beta blocker?

Oxprenolol. ***Oxprenolol*** - **Oxprenolol** is a non-selective beta-blocker with **intrinsic sympathomimetic activity (ISA)**, meaning it blocks both β1 and β2 receptors and partially stimulates them. - Its non-selective action means it affects both the heart (β1) and other organs like the lungs (β2), making it less suitable for patients with respiratory conditions. *Nebivolol* - **Nebivolol** is a highly cardioselective beta-blocker that primarily blocks **β1 receptors** and also has **vasodilatory properties** due to nitric oxide release. - Its high selectivity translates to fewer β2-mediated side effects, such as bronchoconstriction. *Atenolol* - **Atenolol** is a **cardioselective beta-blocker** that predominantly blocks **β1 receptors** at therapeutic doses. - This selectivity makes it a common choice for cardiovascular conditions, reducing the risk of bronchospasm compared to non-selective agents. *Betaxolol* - **Betaxolol** is a **cardioselective beta-blocker** primarily used for the treatment of hypertension and glaucoma. - It selectively blocks **β1 adrenergic receptors**, minimizing effects on the lungs compared to non-selective beta-blockers.

Q: What is the correct sequence of medication administration for pre-operative prophylaxis in pheochromocytoma?

Alpha blockade followed by beta blockade. ***Alpha blockade followed by beta blockade*** - **Alpha blockade** should always be initiated first to control **hypertension** and prevent a **hypertensive crisis** during surgery. This is critical because pheochromocytoma causes excessive catecholamine release, leading to profound vasoconstriction. - **Beta blockade** is then added only after adequate alpha blockade has been achieved to control **tachycardia** and arrhythmias, preventing **unopposed alpha-adrenergic stimulation** which could paradoxically worsen hypertension. *Simultaneous alpha and beta blockade* - Administering both simultaneously is dangerous because **beta blockade** can mask the effects of inadequate alpha blockade. - This can lead to **unopposed alpha-adrenergic stimulation** after beta blockade, causing severe **vasoconstriction** and hypertensive crisis. *Beta blockade followed by alpha blockade* - Initiating with **beta blockade** without prior **alpha blockade** is absolutely contraindicated in pheochromocytoma. - This can lead to severe and potentially fatal **hypertension** due to **unopposed alpha-adrenergic stimulation** as beta blockade prevents vasodilation. *Alpha blockade only* - While essential for initial management, **alpha blockade alone** might not fully control all symptoms, especially **tachycardia** and **arrhythmias** caused by high circulating catecholamine levels. - Adding a **beta blocker** after achieving adequate alpha blockade helps in controlling these cardiac effects, optimizing patient preparation for surgery.

Question 1

Nesiritide causes vasodilation through?

Accepted Answer

Guanosine 3',5'-cyclic monophosphate (cGMP)

Answer

ATP

Answer

Cyclic adenosine monophosphate (cAMP)

Answer

K+ ions

Question 2

Which of the following is a mineralocorticoid antagonist?

Accepted Answer

Spironolactone

Answer

Inamrinone

Answer

Nicorandil

Answer

Ketorolac

Question 3

What is the drug of choice for a classical angina attack?

Accepted Answer

GTN

Answer

CCBs

Answer

β-blocker

Answer

Prazosin

Question 4

Which of the following is a renin inhibitor?

Accepted Answer

Remikiren

Answer

Losartan

Answer

Benazepril

Answer

Imidapril

Question 5

Which of the following medications is most likely to cause reflex tachycardia?

Accepted Answer

Nifedipine

Answer

Verapamil

Answer

Propranolol

Answer

Amlodipine

Question 6

Which of the following statements about hypolipidemic drugs is false?

Accepted Answer

Cholesterol reducing drugs are contraindicated in child less than 8 years

Answer

Gemfibrozil causes myopathy

Answer

Gemfibrozil can increase myopathy caused by statins

Answer

Lovastatin can cause hepatic dysfunction

Question 7

Which of the following is a second-generation beta blocker?

Accepted Answer

Atenolol

Answer

Timolol

Answer

Nadolol

Answer

Propranolol

Question 8

Which beta-1 antagonist is used in congestive cardiac failure?

Accepted Answer

Metoprolol

Answer

Atenolol

Answer

Esmolol

Answer

Bisoprolol

Question 9

Which of the following is not a cardioselective beta blocker?

Accepted Answer

Oxprenolol

Answer

Nebivolol

Answer

Atenolol

Answer

Betaxolol

Question 10

What is the correct sequence of medication administration for pre-operative prophylaxis in pheochromocytoma?

Accepted Answer

Alpha blockade followed by beta blockade

Answer

Beta blockade followed by alpha blockade

Answer

Simultaneous alpha and beta blockade

Answer

Alpha blockade only

Cardiovascular Drugs — MCQs

Cardiovascular Drugs — MCQs

On this page

Practice by Chapter

Want unlimited practice?