Cardiovascular Drugs — MCQs

After using transdermal nitroglycerin skin patches for 1 week, a patient with an 8-month history of chronic stable angina pectoris observes an increasing frequency of mild angina episodes during exertion. The patient has been conscientiously applying a new patch every morning immediately after removing the old one. The patient's increased frequency of anginal attacks is most likely because of

Q876Easy

What is a known side effect of minoxidil that is also its therapeutic use?

Q877Medium

Which of the following drugs can be used for secondary prevention of coronary artery disease?

Q878Medium

A 71-year-old woman, receiving a drug to lower her serum cholesterol, has developed muscle pain and weakness unrelated to physical activity over the past week. On examination, she has diffuse but mild muscle tenderness. Laboratory studies show her serum creatine kinase is 2049 U/L and creatinine is 2 mg/dL. Urine dipstick analysis is positive for blood, without RBCs on urine microscopy. Which of the following drugs is most likely to produce her findings?

Q879Easy

Nitrates are not indicated in which of the following conditions?

Q880Easy

Which of the following drugs is an ACE inhibitor?

Cardiovascular Drugs Indian Medical PG Practice Questions and MCQs

Question 871: Concomitant administration of which drug with organic nitrates is contraindicated due to marked potentiation of vasodilatory action leading to profound hypotension?

A. Propranolol
B. Fluoxetine
C. Hydrochlorothiazide
D. Sildenafil (Correct Answer)

Explanation: **Explanation:** The correct answer is **Sildenafil**. The contraindication between organic nitrates and sildenafil (a PDE-5 inhibitor) is a classic high-yield pharmacological interaction based on the **Nitric Oxide (NO) - cGMP pathway**. **Mechanism of Interaction:** 1. **Nitrates** act by releasing Nitric Oxide, which stimulates the enzyme **Guanylyl Cyclase**, leading to increased production of **cyclic GMP (cGMP)**. cGMP causes vascular smooth muscle relaxation. 2. **Sildenafil** inhibits **Phosphodiesterase-5 (PDE-5)**, the enzyme responsible for the degradation of cGMP. 3. When taken together, there is a synergistic effect: Nitrates increase cGMP production while Sildenafil prevents its breakdown. This leads to a massive accumulation of cGMP, causing profound systemic vasodilation, severe hypotension, and potentially fatal myocardial infarction. **Analysis of Incorrect Options:** * **A. Propranolol:** This is a non-selective beta-blocker. It is actually frequently used *with* nitrates in chronic stable angina to prevent reflex tachycardia caused by nitrates. * **B. Fluoxetine:** An SSRI antidepressant. While it has many drug interactions (via CYP450 inhibition), it does not have a direct synergistic vasodilatory effect with nitrates. * **C. Hydrochlorothiazide:** A thiazide diuretic. While it can cause mild hypotension, it does not share the specific cGMP-mediated pathway that leads to the life-threatening interaction seen with PDE-5 inhibitors. **Clinical Pearls for NEET-PG:** * **Time Window:** Patients should be advised not to take Nitrates within **24 hours** of Sildenafil/Vardenafil or **48 hours** of Tadalafil (due to its longer half-life). * **Management:** If a patient develops hypotension after this combination, aggressive fluid resuscitation and alpha-adrenergic agonists are required; nitrates must be strictly avoided. * **Other PDE-5 Inhibitors:** Tadalafil and Vardenafil carry the same contraindication.

Question 872: What is the primary pharmacological treatment for orthostatic hypotension?

A. Dopamine
B. Diuretics
C. Fludrocortisone (Correct Answer)
D. Calcium channel blockers

Explanation: **Explanation:** **Correct Option: C. Fludrocortisone** Orthostatic hypotension (OH) is defined as a sustained reduction in systolic blood pressure of at least 20 mmHg or diastolic blood pressure of 10 mmHg within 3 minutes of standing. **Fludrocortisone** is considered the first-line pharmacological treatment. It is a potent synthetic mineralocorticoid that works by increasing sodium and water reabsorption in the distal renal tubules. This expands the extracellular fluid (ECF) volume and increases the sensitivity of alpha-adrenergic receptors to circulating catecholamines, thereby maintaining blood pressure during postural changes. **Analysis of Incorrect Options:** * **A. Dopamine:** While dopamine is a vasopressor used in acute shock or severe bradycardia, it is administered intravenously and is not suitable for the chronic, long-term management of orthostatic hypotension. * **B. Diuretics:** These drugs promote the excretion of sodium and water, leading to volume depletion. Diuretics are a common *cause* of orthostatic hypotension, not a treatment. * **C. Calcium Channel Blockers (CCBs):** CCBs cause peripheral vasodilation and decrease systemic vascular resistance, which would further lower blood pressure and exacerbate orthostatic symptoms. **High-Yield Clinical Pearls for NEET-PG:** * **Non-pharmacological first step:** Increased salt intake, hydration, and use of compression stockings. * **Midodrine:** An alpha-1 agonist often used as an alternative or adjunct to fludrocortisone. * **Droxidopa:** A synthetic precursor of norepinephrine used specifically in neurogenic orthostatic hypotension. * **Side effect of Fludrocortisone:** Monitor for hypokalemia, supine hypertension, and peripheral edema.

Question 873: Which of the following traditional medicines is effective in the treatment of heart failure?

A. Terminalia Arjuna (Correct Answer)
B. Neem bark extract
C. St. John's wort
D. Ginkgo biloba

Explanation: **Explanation:** **Terminalia Arjuna (Option A)** is the correct answer. In traditional Ayurvedic medicine, the bark of the *Terminalia arjuna* tree has been used for centuries as a cardiotonic. Modern pharmacological studies have shown that it possesses **positive inotropic properties**, likely due to the presence of glycosides (arjunetin) and flavonoids. It enhances left ventricular ejection fraction (LVEF), reduces pulmonary capillary wedge pressure, and provides antioxidant benefits, making it an effective adjunctive therapy in chronic heart failure and angina. **Analysis of Incorrect Options:** * **Neem bark extract (Option B):** Primarily known for its antimicrobial, anti-inflammatory, and hypoglycemic properties. It has no established role in the management of heart failure. * **St. John’s Wort (Option C):** Used primarily for mild-to-moderate depression. In pharmacology, it is high-yield because it is a **potent inducer of Cytochrome P450 (CYP3A4)**, leading to significant drug interactions (e.g., reducing levels of digoxin, warfarin, and cyclosporine). * **Ginkgo biloba (Option D):** Used for cognitive enhancement and peripheral vascular diseases (like intermittent claudication) due to its anti-platelet and vasodilator effects. It does not provide the inotropic support required for heart failure. **High-Yield Clinical Pearls for NEET-PG:** * **Mechanism:** Arjuna bark acts similarly to digitalis but with a much wider therapeutic index (less toxicity). * **Drug Interaction:** Always remember **St. John’s Wort** as a "CYP Inducer"—it can worsen heart failure management by lowering the plasma concentration of cardiac drugs like Digoxin. * **Other Cardiotonic Plants:** Apart from *Digitalis lanata* (Digoxin), *Terminalia arjuna* is the most frequently tested traditional cardiotonic in Indian medical exams.

Question 874: Which of the following statements is not true regarding ACE inhibitors?

A. They are used in asthma.
B. They can increase quality of life.
C. Postural hypotension is a potential side effect. (Correct Answer)
D. A decrease in sodium levels can be observed.

Explanation: ### Explanation **1. Why Option C is the Correct Answer (The "Not True" Statement)** In the context of standard NEET-PG pharmacology, **Postural Hypotension** is classically associated with Alpha-blockers (like Prazosin) rather than ACE inhibitors (ACEIs). While ACEIs can cause "First Dose Hypotension" (an abrupt drop in BP after the initial dose, especially in volume-depleted patients) [1], [3], [4], they do not typically cause chronic postural/orthostatic changes. Therefore, among the choices provided, it is considered the least characteristic or "not true" statement regarding their routine side-effect profile. **2. Analysis of Incorrect Options (True Statements)** * **Option A (Used in Asthma):** ACEIs are safe for use in asthmatic patients because they do not cause bronchoconstriction (unlike non-selective Beta-blockers). While they may cause a dry cough due to bradykinin accumulation [4], they do not trigger an asthma attack. * **Option B (Increase Quality of Life):** ACEIs are gold-standard drugs in Chronic Heart Failure (CHF). They reduce remodeling, decrease mortality, and significantly improve the functional capacity and quality of life of the patient [2], [3]. * **Option D (Decrease in Sodium Levels):** ACEIs inhibit Angiotensin II, leading to decreased Aldosterone secretion. Since Aldosterone is responsible for sodium reabsorption, its inhibition leads to **natriuresis** (loss of sodium) and potential hyponatremia. **3. NEET-PG High-Yield Clinical Pearls** * **Teratogenicity:** ACEIs are strictly contraindicated in pregnancy (cause fetal renal dysgenesis). * **Side Effect Mnemonic (CAPTOPRIL):** **C**ough (dry), **A**ngioedema, **P**roteinuria, **T**aste changes, **O**rthostatic hypotension (rare/first dose), **P**regnancy contraindication, **R**enal artery stenosis (contraindicated in bilateral), **I**ncreased potassium (Hyperkalemia), **L**eukopenia. * **Drug of Choice:** ACEIs are the first-line treatment for hypertension in patients with **Diabetes Mellitus** due to their renoprotective (decreased proteinuria) effects [3].

Question 875: After using transdermal nitroglycerin skin patches for 1 week, a patient with an 8-month history of chronic stable angina pectoris observes an increasing frequency of mild angina episodes during exertion. The patient has been conscientiously applying a new patch every morning immediately after removing the old one. The patient's increased frequency of anginal attacks is most likely because of

A. A sudden onset of vasospastic angina
B. Engaging in vigorous exercise
C. Cellular tolerance to organic nitrates (Correct Answer)
D. Induction of cytochrome P450 enzyme by nitroglycerin

Explanation: **Explanation:** **1. Why the Correct Answer is Right:** The patient is experiencing **nitrate tolerance** (tachyphylaxis). Nitroglycerin works by releasing nitric oxide (NO), which requires intracellular **sulfhydryl (-SH) groups** and the enzyme **mitochondrial aldehyde dehydrogenase (ALDH2)**. Continuous exposure to nitrates (applying a new patch immediately after removing the old one) leads to: * Depletion of free sulfhydryl groups. * Inactivation of ALDH2. * Increased production of free radicals (oxidative stress) that inhibit guanylate cyclase. Because the patient maintained a constant 24-hour plasma concentration without a "nitrate-free interval," the drug lost its therapeutic efficacy, leading to the recurrence of anginal symptoms. **2. Why Incorrect Options are Wrong:** * **Option A:** Vasospastic (Prinzmetal) angina occurs due to coronary artery spasms at rest, not typically triggered by exertion, and wouldn't suddenly develop due to patch use. * **Option B:** While exercise triggers angina, the question specifies an *increasing frequency* despite medication use, pointing toward drug failure rather than a change in activity level. * **Option C:** Nitroglycerin is metabolized primarily by glutathione reductase and ALDH2, not by the CYP450 system. It does not act as an enzyme inducer. **3. NEET-PG High-Yield Pearls:** * **Nitrate-Free Interval:** To prevent tolerance, a daily drug-free period of **10–12 hours** (usually at night) is mandatory. * **Monday Disease:** Industrial workers exposed to nitrates lose tolerance over the weekend; re-exposure on Monday causes sudden vasodilation (headache/dizziness). * **Drug of Choice:** Sublingual Nitroglycerin is the DOC for **acute** anginal attacks; Transdermal patches/Isosorbide mononitrate are for **prophylaxis**. * **Contraindication:** Never co-administer with **Sildenafil** (PDE-5 inhibitors) due to the risk of severe, fatal hypotension.

Question 876: What is a known side effect of minoxidil that is also its therapeutic use?

A. Bradycardia
B. Hair growth (Correct Answer)
C. Gynecomastia
D. Vasodilation

Explanation: **Explanation:** **Minoxidil** is a potent **K+ channel opener** that acts as a direct-acting vasodilator. By opening ATP-sensitive potassium channels in vascular smooth muscle, it causes hyperpolarization and relaxation of arterioles, leading to a significant drop in blood pressure. **Why "Hair growth" is correct:** A notable side effect of systemic minoxidil therapy is **hypertrichosis** (excessive hair growth on the face, arms, and back). This occurs because the drug increases blood flow to hair follicles and stimulates the transition of follicles from the resting (telogen) phase to the active (anagen) phase. This side effect was repurposed for the therapeutic treatment of **androgenetic alopecia** (male/female pattern baldness) via topical formulations (e.g., Rogaine). **Analysis of incorrect options:** * **A. Bradycardia:** Minoxidil causes profound vasodilation, which triggers a **reflex tachycardia** (not bradycardia) due to baroreceptor activation. It is often co-administered with a beta-blocker to counteract this. * **C. Gynecomastia:** This is a classic side effect of **Spironolactone** (a potassium-sparing diuretic), not minoxidil. * **D. Vasodilation:** While minoxidil does cause vasodilation, this is its **primary mechanism of action**, not a side effect. The question asks for a side effect that became a therapeutic use. **High-Yield Clinical Pearls for NEET-PG:** * **Fluid Retention:** Minoxidil causes significant salt and water retention (edema); it is usually prescribed with a loop diuretic (Furosemide). * **Black Box Warning:** It can cause **pericardial effusion** or tamponade in some patients. * **Indication:** Reserved for severe, refractory hypertension that does not respond to standard triple-drug regimens.

Question 877: Which of the following drugs can be used for secondary prevention of coronary artery disease?

A. Gemfibrozil (Correct Answer)
B. Colestipol
C. Temisaan
D. Vitamin E

Explanation: ### Explanation **Correct Option: A. Gemfibrozil** Gemfibrozil is a **fibrate** that acts as a **PPAR-α (Peroxisome Proliferator-Activated Receptor-alpha) agonist**. It primarily lowers serum triglycerides and increases HDL-C levels. Large-scale clinical trials, most notably the **Helsinki Heart Study (HHS)** and the **VA-HIT (Veterans Affairs High-Density Lipoprotein Intervention Trial)**, demonstrated that Gemfibrozil significantly reduces the risk of major cardiovascular events (such as myocardial infarction) in patients with pre-existing coronary artery disease (CAD) and low HDL levels. This makes it a recognized agent for secondary prevention. **Why Incorrect Options are Wrong:** * **B. Colestipol:** This is a Bile Acid Sequestrant. While it lowers LDL-C, it is generally less effective than statins and has not shown consistent, robust evidence in secondary prevention trials compared to fibrates or statins. It can also paradoxically increase triglycerides. * **C. Telmisartan (Misspelled as Temisaan):** While ARBs (Angiotensin Receptor Blockers) like Telmisartan are used in CAD management (especially in hypertensive or diabetic patients), the specific evidence for "secondary prevention" in the context of lipid-lowering trials (where this question is usually framed) points toward Gemfibrozil. * **D. Vitamin E:** Extensive clinical trials (e.g., the HOPE study) have conclusively shown that antioxidant vitamins, including Vitamin E, do **not** provide any benefit in the secondary prevention of cardiovascular disease. **High-Yield Clinical Pearls for NEET-PG:** * **Mechanism of Fibrates:** Activation of PPAR-α leads to increased expression of Lipoprotein Lipase (LPL), enhancing triglyceride clearance. * **Drug Interaction:** Avoid combining Gemfibrozil with **Statins** (especially Simvastatin) as it inhibits statin glucuronidation, significantly increasing the risk of **myopathy and rhabdomyolysis**. (Fenofibrate is a safer alternative if a statin-fibrate combo is needed). * **Primary vs. Secondary:** Secondary prevention refers to reducing the risk of a second event in patients who already have established CAD.

Question 878: A 71-year-old woman, receiving a drug to lower her serum cholesterol, has developed muscle pain and weakness unrelated to physical activity over the past week. On examination, she has diffuse but mild muscle tenderness. Laboratory studies show her serum creatine kinase is 2049 U/L and creatinine is 2 mg/dL. Urine dipstick analysis is positive for blood, without RBCs on urine microscopy. Which of the following drugs is most likely to produce her findings?

A. Cholestyramine
B. Clofibrate
C. Ezetimibe
D. Lovastatin (Correct Answer)

Explanation: ### Explanation **Correct Option: D. Lovastatin** The clinical presentation describes **Statin-induced Myopathy** progressing to **Rhabdomyolysis**. Statins (HMG-CoA reductase inhibitors) like Lovastatin are notorious for causing muscle toxicity, ranging from mild myalgia to life-threatening rhabdomyolysis. * **Mechanism:** Statins inhibit the synthesis of mevalonate, a precursor not only to cholesterol but also to **Coenzyme Q10 (Ubiquinone)**, which is essential for mitochondrial energy production in muscles. * **Clinical Correlation:** The patient has significantly elevated **Creatine Kinase (CK >10x upper limit)** and **Acute Kidney Injury (Creatinine 2 mg/dL)**. The "positive blood on dipstick but no RBCs on microscopy" is a classic hallmark of **Myoglobinuria**, where myoglobin released from damaged muscle cells mimics hemoglobin on the dipstick. **Why Incorrect Options are Wrong:** * **A. Cholestyramine:** A bile acid sequestrant. Its primary side effects are GI-related (bloating, constipation) and interference with the absorption of fat-soluble vitamins. It does not cause muscle damage. * **B. Clofibrate:** While Fibrates can cause myopathy, they are less commonly the primary cause compared to statins in modern clinical vignettes. However, the risk of myopathy increases significantly if a fibrate (especially Gemfibrozil) is *added* to a statin. * **C. Ezetimibe:** Inhibits cholesterol absorption at the brush border. It is generally well-tolerated; while rare cases of myopathy exist, it is not the classic or most likely culprit in this scenario. **NEET-PG High-Yield Pearls:** * **Risk Factors:** Statin-induced myopathy risk increases with age, female sex, renal insufficiency, and concurrent use of **CYP3A4 inhibitors** (e.g., Erythromycin, Ketoconazole) or **Fibrates**. * **Diagnostic Clue:** Always look for the "Dipstick (+) for blood, Microscopy (-) for RBCs" triad to diagnose rhabdomyolysis/myoglobinuria. * **Monitoring:** Routine CK monitoring is not required for all patients on statins, but must be checked immediately if the patient reports unexplained muscle pain or weakness.

Question 879: Nitrates are not indicated in which of the following conditions?

A. Congestive heart failure
B. Cyanide poisoning
C. Renal colic (Correct Answer)
D. Esophageal spasm

Explanation: ### Explanation **Nitrates** are potent vasodilators that act primarily by releasing Nitric Oxide (NO), which stimulates guanylyl cyclase to increase cGMP, leading to smooth muscle relaxation. **Why Renal Colic is the Correct Answer:** While nitrates relax various smooth muscles, they have **no clinical efficacy in renal colic**. Renal colic is caused by the passage of stones in the ureter, where the pain is best managed by NSAIDs (to inhibit prostaglandin-mediated pain and inflammation) and antispasmodics (like hyoscine). Nitrates do not provide sufficient or specific relaxation of the ureteric musculature to be indicated for this condition. **Analysis of Incorrect Options:** * **Congestive Heart Failure (CHF):** Nitrates are used as **venodilators**. They reduce preload (venous return), which decreases ventricular wall tension and myocardial oxygen demand, providing relief in acute heart failure. * **Cyanide Poisoning:** Amyl nitrite and sodium nitrite are used to induce **methemoglobinemia**. Methemoglobin has a high affinity for cyanide, forming cyanmethemoglobin, which prevents cyanide from binding to cytochrome oxidase in the mitochondria. * **Esophageal Spasm:** Nitrates relax the smooth muscles of the esophagus. They are a recognized pharmacological treatment for **Achalasia cardia** and diffuse esophageal spasms to reduce lower esophageal sphincter (LES) pressure. **High-Yield Clinical Pearls for NEET-PG:** * **Drug of Choice (DOC):** Nitrates are the DOC for acute anginal attacks (Sublingual Nitroglycerin). * **Monday Disease:** Workers in dynamite factories develop tolerance to nitrates during the week; loss of tolerance over the weekend leads to "Monday morning headaches" due to sudden vasodilation upon re-exposure. * **Contraindication:** Never co-administer nitrates with **Sildenafil** (PDE-5 inhibitors) as it can cause life-threatening hypotension. * **Right Ventricular Infarct:** Nitrates are strictly contraindicated in RV infarction as they further reduce preload, leading to a collapse in cardiac output.

Question 880: Which of the following drugs is an ACE inhibitor?

A. Losartan
B. Milrinone
C. Candesartan
D. Fosinopril (Correct Answer)

Explanation: **Explanation:** **ACE Inhibitors (ACEIs)** are drugs that inhibit the Angiotensin-Converting Enzyme, preventing the conversion of Angiotensin I to Angiotensin II. A key pharmacological characteristic of this class is that almost all drug names end with the suffix **"-pril."** * **Fosinopril (Option D)** is the correct answer. It is a phosphorus-containing ACE inhibitor. Notably, it is a prodrug that is unique because it undergoes **dual compensation excretion** (both renal and hepatic). This makes it safer for patients with renal impairment compared to other ACEIs. **Analysis of Incorrect Options:** * **Losartan (Option A) and Candesartan (Option C):** These drugs belong to the **Angiotensin II Receptor Blockers (ARBs)** class. They end with the suffix **"-sartan."** Unlike ACEIs, they do not affect bradykinin levels, meaning they are less likely to cause the dry cough associated with ACEIs. * **Milrinone (Option B):** This is a **Phosphodiesterase-3 (PDE3) inhibitor**. It acts as an "inodilator" by increasing cardiac contractility and causing vasodilation, typically used in acute heart failure. **High-Yield Clinical Pearls for NEET-PG:** 1. **Captopril and Lisinopril** are the only ACEIs that are **not prodrugs**. 2. **Side Effects:** The most common side effect is a **dry cough** (due to increased bradykinin). The most serious is **angioedema**. 3. **Contraindications:** ACEIs are strictly **teratogenic** (cause fetal renal anomalies) and are contraindicated in pregnancy and bilateral renal artery stenosis. 4. **Drug of Choice:** ACEIs are the first-line treatment for hypertension in patients with **Diabetes Mellitus** because they provide renoprotective effects (reduce diabetic nephropathy).

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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Lipid-Lowering Drugs

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Anticoagulants and Antiplatelet Drugs

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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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