Cardiovascular Drugs Practice Questions

Q: Which hypolipidemic drug can exacerbate the symptoms of gout?

Niacin. **Explanation:** **Niacin (Nicotinic Acid)** is the correct answer because it competes with uric acid for the same organic acid secretory carrier in the proximal convoluted tubules of the kidney. This competition leads to decreased renal excretion of uric acid, resulting in **hyperuricemia**. In susceptible individuals, this elevated serum uric acid can precipitate an acute attack of **gout**. **Analysis of Options:** * **Ezetimibe (A):** A cholesterol absorption inhibitor that acts on the NPC1L1 transporter in the intestine. It does not affect renal tubular secretion or uric acid levels. * **Gemfibrozil (B):** A Fibrate that activates PPAR-α. While fibrates can occasionally cause muscle toxicity, they do not typically cause hyperuricemia. In fact, Fenofibrate (another fibrate) actually has a mild uricosuric effect (lowers uric acid). * **Simvastatin (D):** An HMG-CoA reductase inhibitor. The primary side effects of statins are hepatotoxicity and myopathy (rhabdomyolysis); they do not interfere with uric acid metabolism. **NEET-PG High-Yield Pearls:** * **Niacin Side Effects:** The most common side effect is **cutaneous flushing** (mediated by Prostaglandin $D_2$ and $E_2$; prevented by Aspirin). The most serious side effects are **hepatotoxicity** and **hyperglycemia** (caution in diabetics). * **Clinical Contraindications:** Niacin should be avoided in patients with active peptic ulcer disease, gout, and uncontrolled diabetes. * **Lipid Profile:** Niacin is the most effective drug for **increasing HDL levels** and is also useful for lowering Triglycerides and LDL.

Q: Which drug is primarily used for the treatment of hypertriglyceridemia?

Gemfibrozil. **Explanation:** **Gemfibrozil** is the correct answer because it belongs to the **Fibrates** class of drugs, which are the first-line agents for treating isolated hypertriglyceridemia. **Mechanism of Action:** Fibrates act as agonists at the **PPAR-α (Peroxisome Proliferator-Activated Receptor-alpha)** receptors. Activation of these receptors increases the expression of **Lipoprotein Lipase (LPL)**, which enhances the clearance of triglyceride-rich lipoproteins (VLDL and chylomicrons). They also decrease the hepatic synthesis of VLDL. **Analysis of Incorrect Options:** * **Cholestyramine & Resins (Options A & D):** These are Bile Acid Sequestrants. They primarily lower LDL cholesterol by preventing bile acid reabsorption. Crucially, they can actually **increase triglyceride levels** in some patients; therefore, they are contraindicated in severe hypertriglyceridemia. * **Nicotinic Acid (Option B):** While Niacin can lower triglycerides and raise HDL, it is no longer a first-line treatment due to its side effect profile (flushing, glucose intolerance, hyperuricemia) and is generally reserved for refractory cases. **High-Yield NEET-PG Pearls:** * **Drug of Choice:** Fibrates (e.g., Gemfibrozil, Fenofibrate) are the drugs of choice when triglycerides are >500 mg/dL to prevent **acute pancreatitis**. * **Drug Interaction:** Combining Gemfibrozil with Statins significantly increases the risk of **myopathy and rhabdomyolysis** because Gemfibrozil inhibits the glucuronidation (metabolism) of statins. * **Fenofibrate** is preferred over Gemfibrozil if a statin-fibrate combination is necessary, as it has a lower risk of causing myopathy.

Q: Which of the following intravenous drugs can be used in the management of hypertensive emergency?

All of the above. A **hypertensive emergency** is defined as a severe elevation in blood pressure (usually >180/120 mmHg) accompanied by evidence of **acute target organ damage** (e.g., encephalopathy, myocardial infarction, or acute kidney injury). Management requires immediate, controlled reduction of blood pressure using **intravenous (IV) medications** to prevent further damage [1].* **Sodium Nitroprusside (Option B):** Historically the gold standard, it is a potent balanced vasodilator (acting on both arterioles and veins) via nitric oxide release [2, 1]. It has an ultra-short duration of action, allowing for precise titration.* **Esmolol (Option C):** An ultra-short-acting cardioselective {1}-blocker. It is particularly useful in emergencies involving aortic dissection or perioperative hypertension where heart rate control is also vital.* **Hydralazine (Option A):** A direct-acting arteriolar vasodilator [3]. While less predictable than nitroprusside, it is a preferred agent in **pregnancy-induced hypertensive emergencies (Eclampsia/Pre-eclampsia)** due to its safety profile for the fetus.Since all three drugs are administered intravenously and are indicated for rapid BP reduction in specific emergency scenarios, **Option D** is the correct answer.**High-Yield Clinical Pearls for NEET-PG:*** **Drug of Choice (DOC):** **Labetalol** is often considered the first-line agent for most hypertensive emergencies (except acute heart failure).* **Aortic Dissection:** The goal is rapid reduction of SBP to 220/120 mmHg to maintain cerebral perfusion.

Q: Which prostacyclin agonist is usually given orally?

Selexipag. **Explanation:** **Selexipag** is the correct answer because it is a selective, non-prostanoid **prostacyclin (IP) receptor agonist** specifically designed for **oral administration**. Unlike traditional prostacyclin analogs, Selexipag is a prodrug metabolized into its active form (ACT-333602), providing a longer half-life and making it suitable for twice-daily oral dosing in the management of Pulmonary Arterial Hypertension (PAH). **Analysis of Incorrect Options:** * **Iloprost:** This is a synthetic analog of PGI2. While it can be given intravenously, it is most commonly administered via **inhalation** (6–9 times daily) due to its very short half-life. * **Treprostinil (often confused with 'Teleprost'):** While Treprostinil has an oral formulation (Orenitram), it is more famously known for its subcutaneous or intravenous infusion and inhalation. (Note: "Teleprost" is likely a distractor or misspelling of Treprostinil). * **Riociguat:** This drug is used for PAH, but it is **not a prostacyclin agonist**. It is a **Soluble Guanylate Cyclase (sGC) stimulator** that works via the Nitric Oxide pathway. **High-Yield Clinical Pearls for NEET-PG:** * **Mechanism:** Selexipag targets the IP receptor, leading to vasodilation and anti-proliferative effects on pulmonary vessels. * **PAH Treatment Hierarchy:** Oral agents like Selexipag or Endothelin receptor antagonists (Bosentan/Ambrisentan) are preferred for early-stage PAH (WHO Class II/III), whereas IV Epoprostenol remains the gold standard for severe, late-stage disease (Class IV). * **Side Effects:** Common to all prostacyclin pathways—headache, jaw pain, diarrhea, and flushing.

Q: A patient is prescribed a drug for treating hypertension that can cause tachycardia and marked fluid retention. Which of the following could be the prescribed drug?

Minoxidil. **Explanation:** The correct answer is **Minoxidil**. **Mechanism and Rationale:** Minoxidil is a potent **direct-acting peripheral vasodilator** that works by opening ATP-sensitive potassium channels in vascular smooth muscle, leading to hyperpolarization and relaxation of arterioles. This profound vasodilation significantly drops peripheral resistance, triggering two major compensatory homeostatic mechanisms: 1. **Reflex Tachycardia:** The drop in blood pressure activates the baroreceptor reflex, leading to increased sympathetic outflow. 2. **Fluid Retention:** Reduced renal perfusion and sympathetic activation trigger the Renin-Angiotensin-Aldosterone System (RAAS), causing significant sodium and water retention. To counteract these side effects, Minoxidil is almost always co-administered with a **beta-blocker** (to control heart rate) and a **loop diuretic** (to manage edema). **Analysis of Incorrect Options:** * **A. Captopril:** An ACE inhibitor. It typically causes a slight decrease in sympathetic activity and promotes sodium excretion (natriuresis), making it unlikely to cause tachycardia or fluid retention. * **B. Guanethidine:** An adrenergic neuron blocker. It prevents the release of norepinephrine, typically causing bradycardia and orthostatic hypotension, not tachycardia. * **D. Metoprolol:** A cardioselective beta-1 blocker. It decreases heart rate (bradycardia) and is used to treat tachycardia, not cause it. **NEET-PG High-Yield Pearls:** * **Hypertrichosis:** Minoxidil causes abnormal hair growth; it is used topically for androgenetic alopecia. * **Hydralazine:** Another direct vasodilator that causes similar reflex tachycardia and a lupus-like syndrome (slow acetylators). * **Clinical Use:** Minoxidil is reserved for **refractory hypertension** that does not respond to multidrug regimens.

Q: Which of the following is NOT an ADP inhibitor?

Tirofiban. **Explanation:** The question asks to identify the drug that does not belong to the **ADP (P2Y12) receptor antagonist** class. **1. Why Tirofiban is the correct answer:** Tirofiban is a **Glycoprotein (GP) IIb/IIIa inhibitor**, not an ADP inhibitor. It works by blocking the final common pathway of platelet aggregation—the binding of fibrinogen to the GP IIb/IIIa receptors on the platelet surface [1], [2]. It is administered intravenously, primarily in the management of Acute Coronary Syndrome (ACS) and during Percutaneous Coronary Intervention (PCI). **2. Analysis of incorrect options (ADP Inhibitors):** * **Ticlopidine:** A first-generation thienopyridine ADP inhibitor. It is rarely used now due to side effects like severe neutropenia and TTP [1]. * **Clopidogrel:** A second-generation thienopyridine. It is a prodrug activated by CYP2C19 [3]. It irreversibly inhibits the P2Y12 receptor. * **Prasugrel:** A third-generation thienopyridine. It is more potent and has a faster onset than clopidogrel [3] but carries a higher risk of bleeding. **High-Yield Clinical Pearls for NEET-PG:** * **Classification of Antiplatelets:** * **COX Inhibitors:** Aspirin. * **ADP (P2Y12) Blockers:** Clopidogrel, Prasugrel, Ticlopidine (Irreversible); **Ticagrelor, Cangrelor** (Reversible) [3]. * **GP IIb/IIIa Inhibitors:** Abciximab, Eptifibatide, Tirofiban. * **PDE Inhibitors:** Dipyridamole, Cilostazol. * **Ticagrelor** is unique because it is a direct-acting (not a prodrug) and reversible P2Y12 inhibitor [3]. * **Cilostazol** is the drug of choice for intermittent claudication (Peripheral Vascular Disease).

Q: Aspirin is used in the prophylaxis of myocardial infarction because it results in:

Inhibition of cyclooxygenase. ### Explanation **Correct Answer: B. Inhibition of cyclooxygenase** **Mechanism of Action:** Aspirin (Acetylsalicylic acid) is the only NSAID that **irreversibly** inhibits the enzyme **Cyclooxygenase-1 (COX-1)** by acetylating a specific serine residue. In platelets, COX-1 is responsible for converting arachidonic acid into **Thromboxane A2 (TXA2)**, a potent vasoconstrictor and platelet aggregator. Since platelets are anuclear and cannot synthesize new enzymes, the inhibition lasts for the entire lifespan of the platelet (approx. 7–10 days). This reduction in TXA2 shifts the balance toward Prostacyclin (PGI2), preventing thrombus formation in coronary arteries. **Analysis of Incorrect Options:** * **A. Inhibition of thromboxane synthetase:** Aspirin inhibits the *upstream* enzyme COX-1, not thromboxane synthetase. Specific thromboxane synthetase inhibitors (e.g., Dazoxiben) exist but are not the mechanism for aspirin. * **C. Decreased serum lipids:** Aspirin has no significant effect on lipid profiles. Statins are the primary class used for lipid-lowering in MI prophylaxis. * **D. Coronary steal phenomenon:** This occurs when a vasodilator (like Dipyridamole or Hydralazine) dilates healthy vessels, "stealing" blood away from ischemic areas. Aspirin does not cause this. **High-Yield Clinical Pearls for NEET-PG:** * **Low-dose Aspirin (75–150 mg):** Highly selective for COX-1 (anti-platelet effect). * **High-dose Aspirin:** Inhibits both COX-1 and COX-2 (analgesic/anti-inflammatory effect). * **Primary Prophylaxis:** Aspirin is used to prevent the first MI in high-risk patients. * **Secondary Prophylaxis:** Used in patients with a history of MI or stroke to prevent recurrence. * **Side Effect:** Gastric irritation and bleeding (due to inhibition of protective PGE2 in the stomach).

Q: What is the mechanism of action of sodium nitroprusside?

Increased guanylate cyclase. **Mechanism of Action: Sodium Nitroprusside** **Explanation of the Correct Answer:** Sodium nitroprusside (SNP) is a potent, rapid-acting parenteral vasodilator. Unlike organic nitrates (like nitroglycerin) which require enzymatic bioactivation, SNP is a non-enzymatic nitric oxide (NO) donor. Once in the bloodstream, it spontaneously releases NO, which activates the enzyme **soluble guanylate cyclase**. This leads to an increase in intracellular **cyclic GMP (cGMP)**. Elevated cGMP levels activate protein kinase G, resulting in dephosphorylation of myosin light chains and sequestration of calcium, which causes profound relaxation of both **arteriolar and venous** smooth muscle. **Analysis of Incorrect Options:** * **A. Increased cAMP:** This is the mechanism for drugs like Beta-2 agonists (Salbutamol) or PDE-3 inhibitors (Milrinone), which cause vasodilation via the cAMP pathway, not NO. * **C. Calcium channel blockage:** This describes the mechanism of CCBs (e.g., Amlodipine, Verapamil), which inhibit the entry of calcium into the cell. * **D. K+ channel opener:** Drugs like Minoxidil, Diazoxide, and Nicorandil work by opening ATP-sensitive potassium channels, leading to hyperpolarization and vasodilation. **NEET-PG High-Yield Pearls:** * **Balanced Vasodilator:** SNP acts equally on veins (reducing preload) and arteries (reducing afterload). * **Clinical Use:** Drug of choice for **Hypertensive Emergencies** and controlled hypotension during surgery. * **Toxicity:** Metabolism of SNP releases **cyanide**. Chronic infusion or high doses can lead to cyanide and thiocyanate toxicity. * **Antidote:** Sodium thiosulfate or Hydroxocobalamin (Vitamin B12a) are used to treat SNP-induced cyanide poisoning. * **Light Sensitivity:** SNP is photosensitive; the infusion bottle must be covered with opaque foil.

Question 1

Which hypolipidemic drug can exacerbate the symptoms of gout?

Accepted Answer

Niacin

Answer

Ezetimibe

Answer

Gemfibrozil

Answer

Simvastatin

Question 2

Which drug is primarily used for the treatment of hypertriglyceridemia?

Accepted Answer

Gemfibrozil

Answer

Cholestyramine

Answer

Nicotinic acid

Answer

Resins

Question 3

Which of the following intravenous drugs can be used in the management of hypertensive emergency?

Accepted Answer

All of the above

Answer

Hydralazine

Answer

Sodium nitroprusside

Answer

Esmolol

Question 4

Long-term ACE inhibitor therapy may retard the progression of which of the following conditions?

Accepted Answer

All of the above

Answer

Diabetic retinopathy

Answer

Hypertensive nephropathy

Answer

Diabetic nephropathy

Question 5

Which prostacyclin agonist is usually given orally?

Accepted Answer

Selexipag

Answer

Teleprost

Answer

Iloprost

Answer

Riociguat

Question 6

A patient is prescribed a drug for treating hypertension that can cause tachycardia and marked fluid retention. Which of the following could be the prescribed drug?

Accepted Answer

Minoxidil

Answer

Captopril

Answer

Guanethidine

Answer

Metoprolol

Question 7

Which of the following is NOT an ADP inhibitor?

Accepted Answer

Tirofiban

Answer

Ticlopidine

Answer

Clopidogrel

Answer

Prasugrel

Question 8

Aspirin is used in the prophylaxis of myocardial infarction because it results in:

Accepted Answer

Inhibition of cyclooxygenase

Answer

Inhibition of thromboxane synthetase

Answer

Decreased serum lipids

Answer

Coronary steal phenomenon

Question 9

What is the mechanism of action of sodium nitroprusside?

Accepted Answer

Increased guanylate cyclase

Answer

Increased cAMP

Answer

Calcium channel blockage

Answer

IC channel opener

Question 10

A 35-year-old woman presents with palpitations, and diagnostic tests confirm supraventricular tachycardia. Vagal maneuvers fail to provide an adequate response. What is the best therapy that can be advocated?

Accepted Answer

Adenosine

Answer

Amiodarone

Answer

Verapamil

Answer

Digoxin

Cardiovascular Drugs — MCQs

Cardiovascular Drugs — MCQs

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