Cardiovascular Drugs Practice Questions

Q: Which of the following drugs can cause altered taste sensation?

Captopril. **Explanation:** **Correct Option: D. Captopril** Captopril, an ACE inhibitor, is well-known for causing **dysgeusia** (altered taste sensation) or ageusia (loss of taste). This side effect is primarily attributed to the presence of a **sulfhydryl (-SH) group** in its chemical structure [1]. This group can interfere with zinc metabolism or directly affect taste bud function. While other ACE inhibitors can cause this, it is most frequently associated with Captopril [1]. **Analysis of Incorrect Options:** * **A & C (Pefloxacin and Ciprofloxacin):** These are Fluoroquinolones. Their primary side effects include GI upset, tendon rupture (Achilles tendon), and CNS stimulation. While some patients report a metallic taste with certain antibiotics (like Metronidazole or Clarithromycin), it is not a classic or high-yield side effect associated with Fluoroquinolones in the context of NEET-PG. * **B (Rifampicin):** The hallmark side effect of Rifampicin is the **orange-red discoloration** of body fluids (urine, sweat, tears). It is also a potent microsomal enzyme inducer and can cause hepatotoxicity, but it does not typically cause altered taste. **Clinical Pearls for NEET-PG:** * **ACE Inhibitor Side Effects (Mnemonic: CAPTOPRIL):** **C**ough (due to Bradykinin), **A**ngioedema, **P**roteinuria, **T**aste changes, **O**rthostatic hypotension, **P**regnancy contraindication, **R**enal artery stenosis (bilateral) contraindication, **I**ncreased Potassium (Hyperkalemia), **L**eukopenia. * **Other drugs causing metallic/altered taste:** Metronidazole, Lithium, Acetazolamide, Disulfiram, and Phenytoin. * **Zinc Deficiency:** Often presents with dysgeusia; Captopril-induced taste loss sometimes responds to zinc supplementation.

Q: Which of the following drugs releases Nitric oxide?

Hydralazine. **Explanation:** **1. Why Hydralazine is Correct:** Hydralazine is a direct-acting peripheral arterial vasodilator. Its primary mechanism involves the release of **Nitric Oxide (NO)** from the vascular endothelium, which stimulates guanylyl cyclase to increase intracellular **cGMP**. This leads to smooth muscle relaxation and vasodilation. It also inhibits calcium release from the sarcoplasmic reticulum and hyperpolarizes the membrane. **2. Why the other options are incorrect:** * **Aminophylline:** This is a methylxanthine derivative (a complex of theophylline and ethylenediamine). It acts primarily as a **non-selective phosphodiesterase (PDE) inhibitor** and adenosine receptor antagonist, used mainly in asthma/COPD, not via NO release. * **Amrinone (Inamrinone):** This is a **PDE-3 inhibitor**. It increases cAMP levels in cardiac and vascular muscle, exerting positive inotropic and vasodilator effects (inodilator). * **Sildenafil sulfate:** This is a selective **PDE-5 inhibitor**. While it *potentiates* the action of Nitric Oxide by preventing the breakdown of cGMP, it does **not** release NO itself. **High-Yield Clinical Pearls for NEET-PG:** * **Drug-Induced Lupus Erythematosus (DILE):** Hydralazine is a classic cause, especially in "slow acetylators." * **Clinical Use:** It is a preferred drug for managing **hypertension in pregnancy** (along with Labetalol and Methyldopa). * **Reflex Tachycardia:** Because it causes significant arterial dilation, it often triggers compensatory tachycardia and fluid retention; thus, it is frequently co-administered with a Beta-blocker and a diuretic. * **Other NO donors:** Nitroglycerin, Sodium Nitroprusside (releases NO directly), and Minoxidil (though Minoxidil primarily acts via K+ channel opening).

Q: Acute anginal attack can be terminated by:

Nitroglycerin. **Explanation:** **Nitroglycerin (Option A)** is the drug of choice for terminating an acute anginal attack. It acts as a prodrug that releases **Nitric Oxide (NO)**, which stimulates guanylyl cyclase to increase cGMP levels. This leads to dephosphorylation of myosin light chains, causing potent vascular smooth muscle relaxation. Its primary benefit in angina is **venodilation**, which reduces venous return (preload) and decreases myocardial oxygen demand. When administered **sublingually**, it bypasses first-pass metabolism, providing a rapid onset of action (1–3 minutes) essential for acute relief. **Why other options are incorrect:** * **Digoxin (Option B):** A cardiac glycoside used in heart failure and atrial fibrillation. It increases myocardial contractility (positive inotropy), which actually *increases* oxygen demand and could worsen angina. * **Lignocaine (Option C):** A Class IB antiarrhythmic used for ventricular arrhythmias, particularly post-MI. It has no role in relieving myocardial ischemia or anginal pain. * **Verapamil (Option D):** A non-dihydropyridine Calcium Channel Blocker. While used for *prophylaxis* of stable and variant angina, its oral onset is too slow for terminating an acute attack, and IV use is reserved for supraventricular tachycardias. **High-Yield NEET-PG Pearls:** * **Route of Choice:** Sublingual or buccal spray for acute attacks; transdermal patches for chronic prophylaxis. * **Storage:** Nitroglycerin is volatile and light-sensitive; it must be stored in dark glass containers. * **Tolerance:** A "nitrate-free interval" (8–12 hours) is required daily to prevent tachyphylaxis. * **Contraindication:** Never co-administer with **Sildenafil** (PDE-5 inhibitors) due to the risk of severe, fatal hypotension.

Q: Which of the following drugs is commonly responsible for orthostatic hypotension?

Prazosin. **Explanation:** **Prazosin** is the correct answer because it is a highly selective **alpha-1 ($\alpha_1$) adrenergic blocker**. Alpha-1 receptors are primarily located on vascular smooth muscle; blocking them leads to potent vasodilation of both arterioles and veins. When a patient stands up, the normal compensatory sympathetic reflex (vasoconstriction) is inhibited, leading to a sudden drop in blood pressure. This is famously known as the **"First-Dose Phenomenon,"** where severe orthostatic hypotension and syncope occur shortly after the initial dose. **Analysis of Incorrect Options:** * **Clonidine:** This is a central $\alpha_2$ agonist. While it reduces sympathetic outflow, it is more commonly associated with sedation and **rebound hypertension** upon abrupt withdrawal rather than significant orthostatic hypotension. * **Hydralazine:** A direct-acting arteriolar vasodilator. Because it does not affect the venous side (capacitance vessels) or the sympathetic reflex arc, it typically causes **reflex tachycardia** and fluid retention rather than postural hypotension. * **Captopril:** An ACE inhibitor. While it can cause a "first-dose effect" (especially in volume-depleted patients), it does not interfere with the sympathetic nervous system's baroreceptor reflex, making orthostatic hypotension less common than with alpha-blockers. **High-Yield Clinical Pearls for NEET-PG:** * **First-Dose Phenomenon:** To minimize this risk with Prazosin, advise patients to take the first dose at **bedtime** and start with a low dose. * **BPH:** Selective $\alpha_1$ blockers (like Tamsulosin) are preferred for Benign Prostatic Hyperplasia as they target $\alpha_{1A}$ receptors in the bladder neck with less effect on systemic blood pressure. * **Drug of Choice:** Prazosin is also used in the treatment of Raynaud’s phenomenon and scorpion sting (red scorpion) poisoning.

Q: What is the agent of first choice in an acute attack of Prinzmetal's angina?

Nitrates. **Explanation:** **Prinzmetal’s Angina (Variant Angina)** is caused by a sudden, intense coronary artery vasospasm rather than fixed atherosclerotic obstruction. **1. Why Nitrates are the First Choice:** In an **acute attack**, the primary goal is immediate vasodilation to relieve the spasm. **Sublingual Nitroglycerin (Nitrates)** is the agent of choice because it acts as a potent smooth muscle relaxant [2]. Nitrates are converted into Nitric Oxide (NO), which increases cGMP levels, leading to rapid coronary vasodilation and immediate relief of the ischemic pain. **2. Analysis of Incorrect Options:** * **Diltiazem & Verapamil (Calcium Channel Blockers):** While CCBs are the **drugs of choice for long-term prophylaxis** (prevention) of Prinzmetal’s angina, they are not the first choice for an *acute* attack because their onset of action is slower compared to sublingual nitrates [1]. * **Propranolol (Beta-blockers):** These are **strictly contraindicated** in Prinzmetal’s angina. Blocking $\beta_2$ receptors (which cause vasodilation) leaves $\alpha_1$ receptors unopposed, leading to further vasoconstriction and worsening of the coronary spasm. **3. NEET-PG High-Yield Pearls:** * **Drug of choice for Acute Attack:** Sublingual Nitrates [2]. * **Drug of choice for Chronic Prophylaxis:** Calcium Channel Blockers (e.g., Nifedipine, Diltiazem, Verapamil) [1], [3]. * **Contraindicated Drug:** Non-selective Beta-blockers (Propranolol). * **ECG Finding:** Transient ST-segment **elevation** (unlike stable angina, which shows ST-depression). * **Trigger:** Often occurs at rest, typically in the early morning hours.

Q: Nitroglycerine exerts beneficial effects in variant angina primarily by:

Coronary vasodilation. **Explanation:** The primary pathology in **Variant (Prinzmetal) Angina** is a sudden, intense spasm of the coronary arteries rather than fixed atherosclerotic obstruction. This leads to transmural ischemia and ST-segment elevation. **1. Why Option A is Correct:** Nitroglycerine (NTG) acts as a prodrug that releases **Nitric Oxide (NO)**, stimulating guanylyl cyclase and increasing cGMP levels. This leads to dephosphorylation of myosin light chains and relaxation of smooth muscle. In variant angina, the therapeutic goal is to reverse the acute vasospasm. NTG directly causes **coronary vasodilation**, increasing oxygen supply to the myocardium and effectively terminating the spasm. **2. Why Other Options are Incorrect:** * **Option B:** Nitrates do not have a direct negative inotropic effect; they do not decrease ventricular contractility. * **Options C & D:** While reduction of preload (venodilation) and afterload (arteriolar dilation) are the primary mechanisms by which nitrates benefit **Stable Angina** (by reducing myocardial oxygen demand), they are secondary effects in variant angina. In the specific context of a coronary spasm, restoring blood flow via direct vasodilation is the definitive beneficial action. **High-Yield NEET-PG Pearls:** * **Drug of Choice:** For acute attacks of variant angina, **Sublingual Nitroglycerine** is used. For long-term prophylaxis, **Calcium Channel Blockers (CCBs)** are the drugs of choice. * **Contraindication:** **Non-selective Beta-blockers** (e.g., Propranolol) are contraindicated in variant angina as they can worsen spasms due to unopposed alpha-adrenergic activity. * **Monday Disease:** Refers to nitrate tolerance and withdrawal symptoms (tachycardia, dizziness) seen in industrial workers exposed to nitrates.

Q: Which of the following drugs does not act by blocking Gp IIb/IIIa receptors?

Clopidogrel. **Explanation:** The question tests the classification of antiplatelet agents based on their mechanism of action. **1. Why Clopidogrel is the correct answer:** Clopidogrel is a **P2Y12 receptor antagonist**. It works by irreversibly inhibiting the ADP (Adenosine Diphosphate) receptor on the platelet surface. This inhibition prevents the activation of the Gp IIb/IIIa receptor complex, thereby inhibiting platelet aggregation. It does **not** bind directly to the Gp IIb/IIIa receptor itself. **2. Why the other options are incorrect:** Options A, B, and C are all direct **Gp IIb/IIIa inhibitors**, often referred to as the "final common pathway" inhibitors of platelet aggregation: * **Abciximab (A):** A chimeric monoclonal antibody fragment that binds irreversibly to Gp IIb/IIIa receptors. * **Eptifibatide (B):** A cyclic peptide that acts as a reversible competitive inhibitor (derived from rattlesnake venom). * **Tirofiban (C):** A non-peptide small molecule that acts as a reversible competitive inhibitor. **3. High-Yield Clinical Pearls for NEET-PG:** * **Mechanism:** Gp IIb/IIIa receptors normally bind to **fibrinogen** and von Willebrand factor to form cross-links between platelets. * **Route of Administration:** All Gp IIb/IIIa inhibitors are administered **intravenously**, whereas Clopidogrel is administered **orally**. * **Side Effects:** The most significant side effect of Gp IIb/IIIa inhibitors is bleeding and **thrombocytopenia** (especially with Abciximab). * **Clopidogrel Metabolism:** It is a **prodrug** activated by the hepatic enzyme **CYP2C19**. Drugs like Omeprazole can inhibit this enzyme, reducing Clopidogrel's efficacy.

Q: Fenoldopam is used in which of the following conditions?

Hypertensive emergencies. **Explanation:** **Fenoldopam** is a unique pharmacological agent that acts as a **selective post-synaptic Dopamine-1 (D1) receptor agonist**. Its primary clinical utility lies in the management of **Hypertensive Emergencies** (Option A). **Why Option A is Correct:** Activation of D1 receptors leads to potent **arteriolar vasodilation** and a reduction in peripheral vascular resistance. A key feature of Fenoldopam is its ability to cause **renal vasodilation**, which increases renal blood flow and promotes **natriuresis** (sodium excretion) and diuresis. This makes it particularly beneficial for hypertensive patients with concomitant renal impairment, as it maintains organ perfusion while lowering blood pressure. **Why Other Options are Incorrect:** * **B. Orthostatic Hypotension:** This condition requires vasopressors (like Midodrine) or volume expanders. Fenoldopam, being a vasodilator, would worsen hypotension. * **C. Congestive Heart Failure (CHF):** While vasodilators are used in CHF, Fenoldopam is not a standard treatment. Inotropes (like Dobutamine) or ACE inhibitors are preferred. * **D. Angina:** Nitrates and Beta-blockers are the mainstays. Fenoldopam may cause reflex tachycardia, which increases myocardial oxygen demand and could exacerbate angina. **High-Yield Clinical Pearls for NEET-PG:** * **Route:** Administered via continuous intravenous infusion due to a short half-life (~5–10 minutes). * **Unique Benefit:** It is the only parenteral antihypertensive that improves renal perfusion. * **Side Effects:** Headache, flushing, and a dose-dependent increase in **intraocular pressure** (use with caution in glaucoma). * **Comparison:** Unlike Sodium Nitroprusside, Fenoldopam does not carry the risk of cyanide toxicity.

Question 1

Which of the following drugs can cause altered taste sensation?

Accepted Answer

Captopril

Answer

Pefloxacin

Answer

Rifampicin

Answer

Ciprofloxacin

Question 2

Which of the following drugs releases Nitric oxide?

Accepted Answer

Hydralazine

Answer

Aminophylline

Answer

Amrinone

Answer

Sildenafil sulfate

Question 3

Acute anginal attack can be terminated by:

Accepted Answer

Nitroglycerin

Answer

Digoxin

Answer

Lignocaine

Answer

Verapamil

Question 4

Which of the following drugs is commonly responsible for orthostatic hypotension?

Accepted Answer

Prazosin

Answer

Clonidine

Answer

Hydralazine

Answer

Captopril

Question 5

What is the agent of first choice in an acute attack of Prinzmetal's angina?

Accepted Answer

Nitrates

Answer

Diltiazem

Answer

Propranolol

Answer

Verapamil

Question 6

"Monday disease" is seen with which of the following?

Accepted Answer

Isosorbide mononitrate

Answer

Calcium channel blockers

Answer

Benzodiazepines

Answer

Chlorpromazine

Question 7

Nitroglycerine exerts beneficial effects in variant angina primarily by:

Accepted Answer

Coronary vasodilation

Answer

Decreased ventricular contractility

Answer

Reduction of cardiac preload

Answer

Reduction of cardiac afterload

Question 8

Which of the following drugs does not act by blocking Gp IIb/IIIa receptors?

Accepted Answer

Clopidogrel

Answer

Abciximab

Answer

Eptifibatide

Answer

Tirofiban

Question 9

ACE inhibitors are contraindicated in bilateral renal artery stenosis, because:

Accepted Answer

Angiotensin II has a direct effect on GFR

Answer

They enhance bradykinin action

Answer

Hyperreninism affects renal parenchyma

Answer

They affect prostaglandins

Question 10

Fenoldopam is used in which of the following conditions?

Accepted Answer

Hypertensive emergencies

Answer

Orthostatic hypotension

Answer

Congestive heart failure (CHF)

Answer

Angina

Cardiovascular Drugs — MCQs

Cardiovascular Drugs — MCQs

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