Cardiovascular Drugs — MCQs
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Which of the following is non-selective 3rd generation Beta blocker ?
Which non-selective beta-blocker has sympathomimetic activity?
Which of the following medications is not typically used for the treatment of erectile dysfunction?
Which drug is used to keep the patent ductus arteriosus (PDA) open?
Drug of choice for open angle glaucoma:
Which prostaglandin inhibitor is used in the treatment of patent ductus arteriosus (PDA)?
Nesiritide causes vasodilation through?
Which of the following is a mineralocorticoid antagonist?
In which of the following conditions is Verapamil not typically used?
What are the primary mechanisms behind cardiac toxicity associated with Tricyclic antidepressants?
Cardiovascular Drugs Indian Medical PG Practice Questions and MCQs
Question 1061: Which of the following is non-selective 3rd generation Beta blocker ?
- A. Betaxolol
- B. Celiprolol
- C. Nebivolol
- D. Carvedilol (Correct Answer)
Explanation: ***Carvedilol*** - **Carvedilol** is a **non-selective beta-adrenergic antagonist** (blocks both β1 and β2 receptors) with **additional α1-adrenergic blocking activity**, making it a true **3rd generation beta-blocker**. - The α1-blockade provides **vasodilatory properties**, reducing peripheral vascular resistance and improving hemodynamics. - It has favorable effects on lipid metabolism and insulin sensitivity, making it particularly useful in heart failure and hypertension. - Its non-selective beta-blockade combined with vasodilation distinguishes it from selective 3rd generation agents. *Betaxolol* - **Betaxolol** is a **selective β1-adrenergic antagonist** without vasodilatory properties. - Classified as a **2nd generation beta-blocker** due to its cardioselectivity. - Primarily used in glaucoma and hypertension but lacks the non-selective profile and additional mechanisms of 3rd generation agents. *Celiprolol* - **Celiprolol** is a **β1-selective antagonist** with **β2-agonistic effects** providing vasodilation. - While classified as 3rd generation due to vasodilatory properties, it is **selective for β1**, not non-selective. - Its β2-agonism causes peripheral vasodilation but maintains β1-selectivity. *Nebivolol* - **Nebivolol** is a highly **selective β1-adrenergic antagonist** with **vasodilatory effects via nitric oxide (NO) release**. - Classified as 3rd generation due to NO-mediated vasodilation, but it is **β1-selective**, not non-selective. - The combination of high β1-selectivity and endothelial-mediated vasodilation makes it unique among 3rd generation agents.
Question 1062: Which non-selective beta-blocker has sympathomimetic activity?
- A. Nadolol
- B. Pindolol (Correct Answer)
- C. Acebutalol
- D. Metoprolol
Explanation: ***Pindolol*** - **Pindolol** is a **non-selective beta-blocker** that exhibits **intrinsic sympathomimetic activity (ISA)**, meaning it acts as a partial agonist at beta-adrenergic receptors. - Due to ISA, it causes less reduction in resting heart rate and cardiac output compared to beta-blockers without ISA. *Acebutalol* - **Acebutalol** is a **beta-1 selective blocker** (cardioselective) that possesses **intrinsic sympathomimetic activity (ISA)**. - While it has ISA, it is not a non-selective beta-blocker, making it an incorrect answer for this question. *Nadolol* - **Nadolol** is a **non-selective beta-blocker** that does **not** have intrinsic sympathomimetic activity (ISA). - It primarily acts as a pure antagonist at both beta-1 and beta-2 adrenergic receptors. *Metoprolol* - **Metoprolol** is a **beta-1 selective blocker** (cardioselective) and does **not** possess intrinsic sympathomimetic activity (ISA). - Its primary action is blockade of cardiac beta-1 receptors.
Question 1063: Which of the following medications is not typically used for the treatment of erectile dysfunction?
- A. Beta blockers (Correct Answer)
- B. Papaverine
- C. Sildenafil
- D. PG-E
Explanation: ***Beta blockers*** - **Beta blockers** are primarily used to treat conditions like **hypertension** and **heart disease**. - While they can cause ED as a side effect, they are **not used for its treatment**. *Sildenafil* - **Sildenafil** is a **PDE5 inhibitor** that works by increasing **blood flow to the penis**, facilitating an erection. - It is a **first-line oral medication** widely prescribed for erectile dysfunction. *PG-E* - **PG-E** refers to **Prostaglandin E1** (alprostadil), which can be administered via **intracavernosal injection** or **urethral suppository**. - It directly causes **vasodilation** in the penis, leading to an erection, and is used when oral medications are ineffective or contraindicated. *Papaverine* - **Papaverine** is a **non-specific vasodilator** that can be used as an **intracavernosal injection** for ED. - It works by relaxing **smooth muscle** in the penile arteries, increasing blood flow and inducing an erection, often used in combination with phentolamine.
Question 1064: Which drug is used to keep the patent ductus arteriosus (PDA) open?
- A. PGE1 (Correct Answer)
- B. PGI2
- C. PGH2
- D. PGF2α
Explanation: ***PGE1*** - **Prostaglandin E1** (**PGE1**, alprostadil) is used to maintain the patency of the **ductus arteriosus** in neonates with certain congenital heart defects [1], [2]. - It acts as a **vasodilator** on the smooth muscle of the ductus, preventing its closure and allowing for adequate blood flow prior to surgical correction [1], [2]. *PGI2* - **Prostaglandin I2** (**PGI2**, prostacyclin) is a potent **vasodilator** and **platelet aggregation inhibitor** [1]. - While it has cardiovascular effects, it is primarily used for conditions like **pulmonary hypertension** and not for maintaining ductal patency [1]. *PGF2̑* - **Prostaglandin F2̑** (**PGF2̑**) is involved in processes such as **uterine contractions** and **bronchoconstriction** [1], [2]. - It does not play a role in maintaining the patency of the ductus arteriosus. *PGH2* - **Prostaglandin H2** (**PGH2**) is an immediate precursor in the synthesis of various other prostaglandins and thromboxanes. - It is not directly administered as a drug to maintain ductal patency but is an intermediate in their synthesis.
Question 1065: Drug of choice for open angle glaucoma:
- A. Acetazolamide
- B. Latanoprost (Correct Answer)
- C. Brimonidine
- D. Timolol
Explanation: ***Latanoprost*** - **Prostaglandin F2α analogs** like latanoprost are generally considered **first-line therapy** for open-angle glaucoma due to their efficacy and once-daily dosing. - They work by **increasing uveoscleral outflow** of aqueous humor, thereby lowering intraocular pressure (IOP). *Acetazolamide* - **Acetazolamide** is a **carbonic anhydrase inhibitor** that reduces aqueous humor production. - It is typically used for **acute angle-closure glaucoma** or when initial treatments fail, often due to systemic side effects with long-term use. *Timolol* - **Timolol** is a **non-selective beta-blocker** that reduces aqueous humor production. - While effective, it is often a second-line agent or used in combination due to potential systemic side effects like **bronchospasm** and **bradycardia**. *Brimonidine* - **Brimonidine** is an **alpha-2 adrenergic agonist** that reduces aqueous humor production and increases uveoscleral outflow. - It is typically used as a second-line agent or in combination therapy due to potential side effects like **ocular pruritus** and **allergic conjunctivitis**.
Question 1066: Which prostaglandin inhibitor is used in the treatment of patent ductus arteriosus (PDA)?
- A. PGE-2
- B. Misoprostol
- C. Indomethacin (Correct Answer)
- D. Dinoprostone
Explanation: ***Indomethacin*** - **Indomethacin** is a non-steroidal anti-inflammatory drug (**NSAID**) that inhibits **prostaglandin synthesis**, particularly **prostaglandin E2 (PGE2)**. - **PGE2** helps keep the **ductus arteriosus** open in utero; by inhibiting its production, indomethacin facilitates the closure of a **patent ductus arteriosus (PDA)** in neonates. *Misoprostol* - **Misoprostol** is a **prostaglandin E1 (PGE1) analog** and is used to induce labor, treat gastric ulcers, and for medical abortions. - It would work to **maintain** rather than close the **ductus arteriosus** if used in a neonate with a heart defect requiring patency. *Dinoprostone* - **Dinoprostone** is a **prostaglandin E2 analog** used for cervical ripening and labor induction. - It is not used for closing a **PDA**; its prostaglandin agonistic action would likely keep the **ductus arteriosus open**. *PGE-2* - **Prostaglandin E2 (PGE2)** is a naturally occurring prostaglandin that helps maintain the patency of the **ductus arteriosus** in the fetus. - Administering **PGE2** would keep the **ductus arteriosus open**, which is the opposite of the desired effect when treating a **PDA**.
Question 1067: Nesiritide causes vasodilation through?
- A. ATP
- B. Cyclic adenosine monophosphate (cAMP)
- C. K+ ions
- D. Guanosine 3',5'-cyclic monophosphate (cGMP) (Correct Answer)
Explanation: ***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].
Question 1068: Which of the following is a mineralocorticoid antagonist?
- A. Spironolactone (Correct Answer)
- B. Inamrinone
- C. Nicorandil
- D. Ketorolac
Explanation: ***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.
Question 1069: In which of the following conditions is Verapamil not typically used?
- A. Angina pectoris
- B. Atrial fibrillation
- C. Ventricular tachycardia (Correct Answer)
- D. Hypertension
Explanation: ***Ventricular tachycardia*** - Verapamil, a **non-dihydropyridine calcium channel blocker**, can worsen hemodynamics in patients with **ventricular tachycardia (VT)** by causing profound hypotension or precipitating cardiac arrest. - VT often requires prompt treatment with **antiarrhythmics like amiodarone** or **electrical cardioversion**, as it can be life-threatening. - Verapamil is **contraindicated in VT** due to its negative inotropic effects and risk of hemodynamic collapse. *Angina pectoris* - Verapamil is effectively used to treat angina pectoris by **decreasing myocardial oxygen demand** through negative chronotropic and inotropic effects, and by causing **coronary vasodilation**, improving blood flow. - Its effects help to reduce the frequency and severity of anginal episodes, particularly in **stable angina**. *Atrial fibrillation* - Verapamil is commonly used for **rate control in atrial fibrillation** by **slowing conduction through the AV node**, which decreases the ventricular response rate. - It helps to manage symptoms and prevent complications related to rapid heart rates in this arrhythmia. *Hypertension* - Verapamil is used in the treatment of **hypertension** through its vasodilatory effects and reduction in peripheral vascular resistance. - It is particularly useful in patients who cannot tolerate other antihypertensive agents or as part of combination therapy.
Question 1070: What are the primary mechanisms behind cardiac toxicity associated with Tricyclic antidepressants?
- A. Norepinephrine reuptake inhibition only
- B. Anticholinergic effects on the heart
- C. Both norepinephrine reuptake inhibition and anticholinergic effects on the heart (Correct Answer)
- D. Direct membrane stabilizing effects only
Explanation: ***Both norepinephrine reuptake inhibition and anticholinergic effects on the heart*** - **Tricyclic antidepressants (TCAs)** block the reuptake of **norepinephrine**, which can lead to increased sympathetic tone on the heart and potentially **tachyarrhythmias** or other cardiac complications. - TCAs also have potent **anticholinergic effects**, blocking muscarinic receptors in the heart; this can increase **heart rate** and affect cardiovascular stability. - While **direct membrane stabilizing effects** (sodium channel blockade) are critical for **QRS widening and conduction delays**, the combination of norepinephrine reuptake inhibition and anticholinergic effects accounts for the broader spectrum of **TCA-induced cardiac toxicity** including tachycardia and hemodynamic instability. *Norepinephrine reuptake inhibition only* - While TCAs do inhibit norepinephrine reuptake contributing to tachycardia and increased sympathetic tone, this mechanism alone does not fully explain the breadth of cardiac effects seen with these drugs. - The **anticholinergic effects** play a significant additional role in altering cardiac function. *Anticholinergic effects on the heart* - While TCAs do exert anticholinergic effects that can impact heart rate and cardiovascular function, this mechanism alone fails to account for the additional contributions from **norepinephrine reuptake inhibition** to the overall cardiac toxicity. - The combination of both mechanisms is necessary for a complete understanding of **TCA-induced cardiac effects**. *Direct membrane stabilizing effects only* - This option refers to the **quinidine-like action** of TCAs, which involves blocking myocardial fast sodium channels, leading to a **prolonged QRS interval** and increased risk of **ventricular arrhythmias** and **conduction defects**. - While direct membrane stabilization is the **primary mechanism of TCA-induced conduction abnormalities** (QRS widening, heart blocks), the question asks for mechanisms of broader **cardiac toxicity**, which includes the combined effects of norepinephrine reuptake inhibition and anticholinergic actions on heart rate and hemodynamics.
Practice by Chapter
Antihypertensive Agents
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Drugs for Heart Failure
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Antiarrhythmic Drugs
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Antianginal Agents
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Thrombolytic Agents
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Drugs Used in Pulmonary Hypertension
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Drugs Used in Shock
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Cardiovascular Effects of Non-Cardiovascular Drugs
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