Cardiovascular Drugs — MCQs

Cardiovascular Drugs Indian Medical PG Practice Questions and MCQs

Question 601: A 40-year-old male patient has type II diabetes mellitus and hypertension. Which of the following antihypertensive drugs should be avoided in such patients?

A. Lisinopril
B. Hydrochlorothiazide (Correct Answer)
C. Losartan
D. Trandolopril

Explanation: ### Explanation **Correct Option: B. Hydrochlorothiazide** **Why Hydrochlorothiazide is avoided:** Thiazide diuretics like Hydrochlorothiazide are generally avoided or used with caution in patients with Diabetes Mellitus due to their **metabolic side effects**. They can cause **hyperglycemia** by inhibiting insulin release from pancreatic beta cells and decreasing peripheral glucose utilization. Additionally, thiazides can lead to hypokalemia, which further impairs insulin secretion. They also tend to increase LDL cholesterol and triglycerides, worsening the metabolic profile of a diabetic patient. **Why the other options are incorrect:** * **A, C, and D (Lisinopril, Losartan, Trandolapril):** These drugs belong to the classes of **ACE Inhibitors** (Lisinopril, Trandolapril) and **Angiotensin Receptor Blockers (ARBs)** (Losartan). In fact, these are the **drugs of choice** for hypertensive patients with diabetes. They provide **renoprotection** by dilating the efferent arteriole, reducing intraglomerular pressure, and slowing the progression of diabetic nephropathy (microalbuminuria). **NEET-PG High-Yield Pearls:** * **Drug of Choice (DOC):** For Hypertension with Diabetes = ACE Inhibitors or ARBs. * **Metabolic Side Effects of Thiazides:** Remember the mnemonic **"Hyper-GLUC"**: Hyper**G**lycemia, Hyper**L**ipidemia, Hyper**U**ricemia, and Hyper**C**alcemia. * **Beta-Blockers:** Also used with caution in diabetics as they can mask the autonomic symptoms of hypoglycemia (like tachycardia and tremors) and may delay recovery from a hypoglycemic episode. * **Calcium Channel Blockers (CCBs):** These are metabolically neutral and are considered safe second-line agents in diabetic patients.

Question 602: Which among the following is the best inotrope drug for use in right heart failure?

A. Dobutamine
B. Digoxin
C. Dopamine
D. Milrinone (Correct Answer)

Explanation: **Explanation:** **Milrinone** is the drug of choice for right heart failure (RHF) because of its unique dual mechanism as an **"Inodilator."** It is a selective **Phosphodiesterase-3 (PDE-3) inhibitor** that increases intracellular cAMP. 1. **Inotropy:** It increases myocardial contractility. 2. **Vasodilation:** Crucially, it causes potent **pulmonary vasodilation**, which reduces Pulmonary Vascular Resistance (PVR). In RHF, the right ventricle is highly sensitive to afterload; by lowering pulmonary pressures, Milrinone reduces the workload on the right heart while simultaneously improving its pumping capacity [3]. **Why other options are incorrect:** * **Dobutamine:** While a potent $\beta_1$ agonist (inotrope), it is less effective than Milrinone at reducing pulmonary artery pressure [1]. It also increases myocardial oxygen demand more significantly, which can be detrimental in ischemic states. * **Digoxin:** It has weak inotropic effects and is primarily used for rate control in atrial fibrillation [2]. It does not provide the acute afterload reduction required in RHF [4]. * **Dopamine:** At higher doses, it causes alpha-1 mediated vasoconstriction, which can increase pulmonary artery pressure (increasing right ventricular afterload), making it less ideal for RHF [1]. **Clinical Pearls for NEET-PG:** * **Milrinone Side Effect:** The most common side effect is **arrhythmia** and **hypotension** (due to systemic vasodilation). * **Renal Clearance:** Milrinone is renally excreted; dosage adjustment is required in patients with renal impairment. * **Inodilators:** This term refers to drugs like Milrinone and Levosimendan that combine positive inotropy with systemic and pulmonary vasodilation [3].

Question 603: Which of the following drugs can prolong survival in patients with Congestive Heart Failure (CHF)?

A. Furosemide
B. Inamrinone
C. Losartan (Correct Answer)
D. Digoxin

Explanation: **Explanation:** In Congestive Heart Failure (CHF), the primary goal of therapy is to counteract the maladaptive neurohormonal activation (specifically the Renin-Angiotensin-Aldosterone System and the Sympathetic Nervous System) that leads to cardiac remodeling and fibrosis. **Why Losartan is Correct:** Losartan is an **Angiotensin II Receptor Blocker (ARB)**. Like ACE inhibitors, ARBs prevent the deleterious effects of Angiotensin II on the myocardium. By blocking AT1 receptors, they inhibit cardiac remodeling, reduce afterload, and decrease mortality. Drugs that modify the disease process (ACEIs, ARBs, Beta-blockers, Spironolactone, and SGLT2 inhibitors) are proven to **prolong survival** in CHF. **Why the others are Incorrect:** * **Furosemide (Option A):** A loop diuretic used for symptomatic relief of pulmonary and peripheral edema. While essential for managing "wet" heart failure, it does not decrease mortality. * **Inamrinone (Option B):** A PDE-3 inhibitor (Inodilator). While it increases cardiac output in acute settings, long-term use of positive inotropes is actually associated with **increased mortality** due to arrhythmias and myocardial oxygen demand. * **Digoxin (Option C):** A cardiac glycoside that improves symptoms and reduces the rate of hospitalization (as shown in the DIG trial), but it has a **neutral effect on mortality**. **High-Yield Clinical Pearls for NEET-PG:** * **Mortality-Reducing Drugs in CHF:** ACE inhibitors (First line), ARBs (if ACEI intolerant), Beta-blockers (Bisoprolol, Carvedilol, Metoprolol succinate), Aldosterone antagonists (Spironolactone), and ARNI (Sacubitril/Valsartan). * **Digoxin Toxicity:** Characterized by gastrointestinal symptoms and xanthopsia (yellow vision). * **Beta-blockers:** Should only be started in **stable** CHF; they are contraindicated in acute decompensated heart failure.

Question 604: ACE inhibitors are contraindicated in which of the following conditions?

A. Diabetes mellitus
B. Hypertension in old age groups
C. Scleroderma
D. Bilateral renal artery stenosis (Correct Answer)

Explanation: **Explanation:** **Why Bilateral Renal Artery Stenosis (RAS) is the correct answer:** In patients with bilateral RAS, renal perfusion pressure is significantly reduced. To maintain an adequate Glomerular Filtration Rate (GFR), the body relies on **Angiotensin II-mediated vasoconstriction of the efferent arteriole**. ACE inhibitors block the production of Angiotensin II, leading to efferent arteriolar vasodilation. This causes a precipitous drop in intraglomerular pressure, resulting in **acute renal failure**. Note: This also applies to patients with a solitary functioning kidney and unilateral RAS. **Analysis of Incorrect Options:** * **A. Diabetes Mellitus:** ACE inhibitors are actually the **drugs of choice** for diabetic patients because they are Reno-protective. They reduce intraglomerular pressure and decrease proteinuria, slowing the progression of diabetic nephropathy. * **B. Hypertension in old age:** ACE inhibitors are commonly used in the elderly, especially those with co-morbidities like heart failure or post-myocardial infarction. * **C. Scleroderma:** ACE inhibitors are the **treatment of choice for Scleroderma Renal Crisis**. They effectively manage the malignant hypertension associated with this condition by counteracting the massive activation of the Renin-Angiotensin system. **High-Yield Clinical Pearls for NEET-PG:** * **Teratogenicity:** ACE inhibitors are contraindicated in pregnancy (Category D) as they cause fetal renal dysgenesis and skull hypoplasia. * **Side Effects:** Remember the mnemonic **CAPTOPRIL**: **C**ough (due to Bradykinin), **A**ngioedema, **P**roteinuria, **T**aste changes, **O**thostatic hypotension, **P**regnancy contraindication, **R**enal artery stenosis contraindication, **I**ncreased potassium (Hyperkalemia), **L**eukopenia. * **Monitoring:** Always check serum creatinine and potassium levels within 1–2 weeks of starting an ACE inhibitor. A rise in creatinine up to 30% is acceptable.

Question 605: Which drug inhibits the first step in cholesterol synthesis?

A. Niacin
B. Fenofibrate
C. Cholestramine
D. Lovastatin (Correct Answer)

Explanation: ### Explanation **Correct Option: D. Lovastatin** The rate-limiting and first committed step in cholesterol biosynthesis is the conversion of **HMG-CoA to Mevalonate**. This reaction is catalyzed by the enzyme **HMG-CoA reductase**. Statins (like Lovastatin, Atorvastatin, and Rosuvastatin) are structural analogs of HMG-CoA and act as competitive inhibitors of this enzyme. By blocking this step, they decrease intracellular cholesterol levels, leading to the compensatory up-regulation of LDL receptors on hepatocytes, which further clears LDL from the plasma. **Incorrect Options:** * **A. Niacin (Vitamin B3):** Primarily acts by inhibiting **lipolysis** in adipose tissue (inhibiting hormone-sensitive lipase) and reducing hepatic VLDL synthesis. It does not inhibit the initial step of cholesterol synthesis. * **B. Fenofibrate:** These are PPAR-α agonists. They primarily lower triglycerides by increasing the activity of **lipoprotein lipase (LPL)** and enhancing fatty acid oxidation. * **C. Cholestramine:** This is a **bile acid sequestrant**. It works in the intestine by binding to bile acids and preventing their enterohepatic circulation, forcing the liver to use existing cholesterol to synthesize new bile acids. **High-Yield Clinical Pearls for NEET-PG:** * **Pleiotropic effects of Statins:** Beyond lowering LDL, they improve endothelial function, stabilize atherosclerotic plaques, and have anti-inflammatory properties. * **Side Effects:** The most important are **myopathy/rhabdomyolysis** (monitored via CPK levels) and hepatotoxicity (monitored via LFTs). * **Timing:** Statins with short half-lives (Lovastatin, Simvastatin) should be taken at **night**, as peak cholesterol synthesis occurs during sleep. * **Contraindication:** Statins are strictly **teratogenic** (Category X) and contraindicated in pregnancy.

Question 606: Sodium nitroprusside infusion may result in which of the following?

A. Hypertension
B. Pulmonary edema
C. Cyanide toxicity (Correct Answer)
D. Heart block

Explanation: **Explanation:** **Sodium Nitroprusside (SNP)** is a potent, rapid-acting parenteral vasodilator used in hypertensive emergencies. Its mechanism involves the release of **Nitric Oxide (NO)**, which activates guanylyl cyclase, increasing cGMP and leading to the relaxation of both arteriolar and venous smooth muscles. **Why Cyanide Toxicity is the Correct Answer:** SNP is a complex molecule containing five cyanide groups. When infused, it reacts with hemoglobin to release **cyanide ions**. Normally, the liver enzyme **rhodanase** converts cyanide into the less toxic **thiocyanate**, which is then excreted by the kidneys. However, during prolonged or high-dose infusions, the body’s sulfur donors (thiosulfate) become exhausted, leading to cyanide accumulation. This inhibits mitochondrial cytochrome oxidase, causing cellular hypoxia and metabolic acidosis. **Analysis of Incorrect Options:** * **A. Hypertension:** SNP is a potent vasodilator used to *treat* severe hypertension; it causes rapid hypotension, not hypertension. * **B. Pulmonary Edema:** SNP reduces both preload and afterload, which actually helps in managing acute heart failure and pulmonary edema. * **D. Heart Block:** SNP does not typically affect the cardiac conduction system. Its primary cardiac side effect is reflex tachycardia due to rapid vasodilation. **High-Yield Clinical Pearls for NEET-PG:** * **Antidote for Cyanide Toxicity:** Sodium thiosulfate (provides sulfur donors), Hydroxocobalamin (binds cyanide to form cyanocobalamin), or Nitrites (induce methemoglobinemia to sequester cyanide). * **Thiocyanate Toxicity:** Can occur in patients with renal failure, presenting with psychosis and seizures. * **Storage:** SNP is light-sensitive; the infusion bottle must be wrapped in opaque foil to prevent photodegradation. * **Monitoring:** Always monitor blood pressure continuously (via arterial line) and check acid-base status for signs of metabolic acidosis.

Question 607: What is a known complication of streptokinase therapy?

A. Myocardial rupture
B. Joint pain
C. Intracranial bleed (Correct Answer)
D. Anaphylaxis

Explanation: **Explanation:** Streptokinase is a first-generation fibrinolytic agent derived from Beta-hemolytic Streptococci. It acts by forming a complex with plasminogen, which then converts free plasminogen into active **plasmin**, leading to the degradation of fibrin clots. **Why Intracranial Bleed is the Correct Answer:** The most serious and life-threatening complication of all thrombolytic therapies, including streptokinase, is **hemorrhage**. Since streptokinase induces a "systemic lytic state" (depleting circulating fibrinogen and clotting factors), it significantly increases the risk of **intracranial hemorrhage (ICH)**. This is the most feared complication and a major contraindication if a patient has a history of recent stroke or head trauma. **Analysis of Incorrect Options:** * **A. Myocardial rupture:** This is a mechanical complication of a myocardial infarction itself (usually occurring 3–7 days post-MI), not a direct pharmacological side effect of streptokinase. * **B. Joint pain:** While some drugs cause serum sickness-like reactions, joint pain is not a characteristic or common complication of streptokinase therapy. * **D. Anaphylaxis:** While streptokinase is **antigenic** (being a bacterial protein) and can cause allergic reactions or hypotension, true anaphylaxis is rare compared to the clinical frequency and significance of bleeding complications. *Note: In many exams, if "Bleeding" and "Allergy" are both options, bleeding is prioritized as the most common/serious risk.* **High-Yield NEET-PG Pearls:** * **Antigenicity:** Because it is derived from bacteria, streptokinase can lead to the development of neutralizing antibodies. It should **not be repeated** within 6–12 months of the first dose. * **Mechanism:** It is a **non-fibrin specific** agent (unlike Alteplase/Tenecteplase), which is why it causes more systemic fibrinogen depletion. * **Antidote:** In cases of severe bleeding due to thrombolytics, **Epsilon-aminocaproic acid (EACA)** or **Tranexamic acid** can be used as an antidote.

Question 608: Which of the following drugs predominantly acts by decreasing the preload of the heart?

A. Calcium channel blockers
B. Minoxidil
C. Hydralazine
D. Nitroglycerine (Correct Answer)

Explanation: ### Explanation **1. Why Nitroglycerine is Correct:** Nitroglycerine (NTG) is a potent **venodilator**. At therapeutic doses, it acts primarily on the venous capacitance vessels. By dilating the veins, it increases venous pooling of blood, which reduces the volume of blood returning to the right atrium. This reduction in end-diastolic volume leads to a **decrease in preload**, thereby reducing myocardial oxygen demand. While it can dilate arteries at higher doses, its predominant clinical effect is on preload. **2. Why the Other Options are Incorrect:** * **Hydralazine & Minoxidil:** These are **pure arterial vasodilators**. They act directly on the smooth muscles of the arterioles, decreasing peripheral vascular resistance. Therefore, they primarily **decrease afterload**, not preload. * **Calcium Channel Blockers (CCBs):** Drugs like Nifedipine (Dihydropyridines) are potent **arteriolar dilators** (decreasing afterload). Verapamil and Diltiazem also have significant negative inotropic and chronotropic effects on the heart. They do not have a significant effect on venous capacitance (preload). **3. NEET-PG High-Yield Pearls:** * **Nitrates Mechanism:** They are prodrugs that release **Nitric Oxide (NO)**, which stimulates **guanylyl cyclase**, increasing **cGMP** and leading to dephosphorylation of myosin light chains (relaxation). * **Drug of Choice:** NTG is the drug of choice for acute anginal attacks (sublingual) and acute left ventricular failure (IV) because it "unloads" the heart. * **Tolerance:** Continuous use of nitrates leads to "tachyphylaxis" (tolerance) due to the depletion of free sulfhydryl (-SH) groups. A "nitrate-free interval" of 8–12 hours is required daily. * **Monday Disease:** Workers in dynamite factories exposed to nitrates develop tolerance during the week but lose it over the weekend, leading to headaches and tachycardia upon re-exposure on Mondays.

Question 609: Which of the following can be safely used in pregnancy?

A. ACE inhibitors
B. Aldosterone
C. AT receptor antagonist
D. Propylthiouracil (Correct Answer)

Explanation: **Explanation:** The correct answer is **Propylthiouracil (PTU)**. Managing hypertension and endocrine disorders during pregnancy requires careful selection of drugs to avoid teratogenicity and fetal complications. **Why Propylthiouracil (PTU) is correct:** PTU is an antithyroid drug used to treat hyperthyroidism (Graves' disease). It is the **drug of choice during the first trimester** of pregnancy because it is highly protein-bound, crossing the placenta less readily than Methimazole. This reduces the risk of fetal scalp defects (Aplasia cutis) and choanal atresia associated with Methimazole. **Why the other options are incorrect:** * **ACE Inhibitors (e.g., Enalapril) & AT Receptor Antagonists (ARBs, e.g., Losartan):** Both are strictly **contraindicated** in pregnancy (Category X). They interfere with fetal renal development, leading to **oligohydramnios**, fetal renal failure, hypocalvaria (skull defects), and pulmonary hypoplasia. * **Aldosterone (Mineralocorticoids):** While not a standard therapeutic drug in this context, drugs affecting the mineralocorticoid pathway (like Spironolactone) are generally avoided due to potential anti-androgenic effects on the developing male fetus. **High-Yield NEET-PG Pearls:** 1. **Antihypertensives in Pregnancy:** The preferred agents are **Labetalol** (DOC), **Methyldopa**, and **Hydralazine**. 2. **PTU vs. Methimazole:** PTU is preferred in the **1st trimester** (lower teratogenicity), while Methimazole is preferred in the **2nd and 3rd trimesters** to avoid PTU-induced maternal hepatotoxicity. 3. **Teratogenic triad of ACEIs:** Renal dysgenesis, Oligohydramnios, and Skull ossification defects.

Question 610: Which antianginal drug can be safely used with drugs used for treatment of erectile dysfunction?

A. Calcium channel blockers
B. pFOX inhibitor (Correct Answer)
C. Potassium channel opener
D. Nitrates

Explanation: **Explanation:** The core clinical concern when combining antianginal drugs with erectile dysfunction (ED) medications (PDE-5 inhibitors like Sildenafil) is the risk of **severe, life-threatening hypotension**. **1. Why pFOX Inhibitors are correct:** pFOX (partial Fatty Acid Oxidation) inhibitors, primarily **Trimetazidine**, work by shifting the myocardial metabolism from fatty acid oxidation to glucose oxidation. This metabolic shift requires less oxygen to produce ATP, protecting the ischemic myocardium without affecting hemodynamics. Since pFOX inhibitors do not cause vasodilation or affect the Nitric Oxide (NO)-cGMP pathway, they do not interact with PDE-5 inhibitors and are safe to use concurrently. **2. Why the other options are incorrect:** * **Nitrates (Option D):** These are strictly contraindicated. Nitrates increase cGMP production, while PDE-5 inhibitors prevent cGMP breakdown. This synergistic effect leads to massive cGMP accumulation, causing profound systemic vasodilation and fatal hypotension. * **Potassium Channel Openers (Option C):** Drugs like **Nicorandil** have a dual mechanism; they open K+ channels and also possess a nitrate-like moiety. They can significantly potentiate the hypotensive effects of PDE-5 inhibitors. * **Calcium Channel Blockers (Option A):** While not strictly contraindicated like nitrates, CCBs (especially dihydropyridines) cause vasodilation. Combining them with PDE-5 inhibitors requires extreme caution due to the additive risk of hypotension. **High-Yield Clinical Pearls for NEET-PG:** * **Ranolazine:** Another antianginal that inhibits the late sodium current ($I_{Na}$); it is also hemodynamically neutral and safe with ED drugs. * **Ivabradine:** A pure heart rate reducer (Funny current inhibitor) that is also safe to combine. * **Time Gap:** If a patient on Sildenafil requires nitrates, a minimum gap of **24 hours** is mandatory (48 hours for Tadalafil).

Practice by Chapter

Antihypertensive Agents

Practice Questions

Drugs for Heart Failure

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Antiarrhythmic Drugs

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Antianginal Agents

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Lipid-Lowering Drugs

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Anticoagulants and Antiplatelet Drugs

Practice Questions

Thrombolytic Agents

Practice Questions

Drugs Used in Pulmonary Hypertension

Practice Questions

Drugs Used in Shock

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Cardiovascular Effects of Non-Cardiovascular Drugs

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