Cardiovascular Drugs Practice Questions

Q: A 55-year-old cardiac patient on long-term treatment presents for a follow-up visit. The physician observes a specific finding on ophthalmological examination. Which drug prescribed by the physician is most likely responsible for this finding?

Amiodarone. ***Amiodarone*** - Long-term amiodarone therapy causes **corneal microdeposits** (vortex keratopathy/cornea verticillata) in nearly **90-100%** of patients, appearing as **whorl-like deposits** on slit-lamp examination. - These **bilateral corneal deposits** are typically **asymptomatic** and reversible upon discontinuation, making them a characteristic ophthalmological finding in cardiac patients. *Digoxin* - Digoxin toxicity primarily causes **visual disturbances** like **yellow-green halos** around lights and **blurred vision**, not corneal deposits. - Associated with **nausea**, **vomiting**, and **cardiac arrhythmias** rather than specific ophthalmological examination findings. *Verapamil* - Calcium channel blockers like verapamil do **not cause characteristic ophthalmological findings** on routine examination. - Side effects are primarily **cardiovascular** (hypotension, bradycardia) and **gastrointestinal** (constipation). *Propranolol* - Beta-blockers may cause **dry eyes** but do not produce **characteristic corneal deposits** or specific ophthalmological examination findings. - Primary side effects include **bronchospasm**, **fatigue**, and **cold extremities**, not ocular manifestations.

Q: Which drug is contraindicated in bilateral renal artery stenosis?

Captopril. **Explanation:** The correct answer is **Captopril (Option C)**. **Why Captopril is the correct answer:** In patients with **bilateral renal artery stenosis (RAS)**, the perfusion pressure to the kidneys is significantly reduced. To maintain an adequate Glomerular Filtration Rate (GFR), the body relies on the **Renin-Angiotensin-Aldosterone System (RAAS)**. Specifically, Angiotensin II causes **vasoconstriction of the efferent arteriole**, which creates the necessary back-pressure to maintain filtration. Captopril, an ACE inhibitor, prevents the formation of Angiotensin II. This leads to efferent arteriolar vasodilation, a sudden drop in intraglomerular pressure, and subsequent **acute renal failure**. Therefore, ACE inhibitors (and ARBs) are strictly contraindicated in bilateral RAS or RAS in a solitary functioning kidney. **Analysis of Incorrect Options:** * **A. Propranolol:** A non-selective beta-blocker. While it reduces renin release, it does not cause the acute hemodynamic collapse of GFR seen with ACE inhibitors. * **B. Guanethidine:** An older adrenergic neuron blocker. It lowers blood pressure by inhibiting norepinephrine release but does not specifically target the renal autoregulatory mechanism. * **D. Amlodipine:** A Calcium Channel Blocker (CCB). CCBs primarily dilate the *afferent* arteriole and are generally considered safe (and often preferred) in patients with renal artery stenosis. **High-Yield Clinical Pearls for NEET-PG:** * **Diagnostic Clue:** Suspect bilateral RAS if a patient’s serum creatinine rises by **>30%** after starting an ACE inhibitor or ARB. * **Drug of Choice:** CCBs or Beta-blockers are safer alternatives for hypertension in bilateral RAS. * **Teratogenicity:** ACE inhibitors are also contraindicated in pregnancy (Category X) due to fetal renal dysgenesis and skull hypoplasia.

Q: Which of the following is NOT true about fibrates?

Absorption is delayed by a fatty meal. **Explanation:** Fibrates (e.g., Gemfibrozil, Fenofibrate) are a class of lipid-lowering agents primarily used to target high triglyceride levels. **1. Why Option C is the correct (False) statement:** Contrary to the statement, the absorption of most fibrates is actually **enhanced**, not delayed, by a fatty meal. Fenofibrate, in particular, shows significantly improved bioavailability when taken with food. This is a high-yield pharmacological detail often tested to differentiate it from other drugs where food might impair absorption. **2. Analysis of other options:** * **Option A (True):** Fibrates are the **Drug of Choice (DOC)** for **Type III Hyperlipoproteinemia** (Dysbetalipoproteinemia) and **Severe Hypertriglyceridemia** (TG >500 mg/dL) to prevent acute pancreatitis. * **Option B (True):** Their primary mechanism involves activating **PPAR-alpha** (Peroxisome Proliferator-Activated Receptor-alpha). This leads to increased expression of **Lipoprotein Lipase (LPL)**, which enhances the catabolism of VLDL and triglycerides. * **Option D (True):** Common side effects include GI upset, skin rashes, urticaria, and myalgia. **Impotence** is a documented, though less common, side effect of clofibrate and other members of this class. **Clinical Pearls for NEET-PG:** * **Risk of Myopathy:** The risk of rhabdomyolysis increases significantly when fibrates (especially Gemfibrozil) are combined with **Statins**, as gemfibrozil inhibits the glucuronidation of statins, increasing their plasma levels. * **Gallstones:** Fibrates increase biliary cholesterol excretion, leading to a higher risk of **cholelithiasis** (gallstones). * **Contraindications:** Avoid in patients with severe hepatic or renal dysfunction and gallbladder disease.

Q: Which statin is not metabolized by CYP3A4?

Pravastatin. ### Explanation Statins (HMG-CoA reductase inhibitors) are primarily metabolized by the hepatic cytochrome P450 (CYP) enzyme system. Understanding these metabolic pathways is crucial for predicting drug-drug interactions. **1. Why Pravastatin is the Correct Answer:** Pravastatin is a **hydrophilic** statin. Unlike most other statins, it is not metabolized by the CYP450 system to any significant extent. Instead, it undergoes enzymatic degradation in the cytosol and is excreted unchanged. This makes it a preferred choice in patients taking multiple medications (polypharmacy) or drugs that are potent CYP3A4 inhibitors (e.g., ketoconazole, clarithromycin, protease inhibitors), as it carries a lower risk of drug-induced myopathy. **2. Analysis of Incorrect Options:** * **A, B, and C (Lovastatin, Simvastatin, Atorvastatin):** These are **lipophilic** statins. They are primarily metabolized by the **CYP3A4** isoenzyme. Co-administration of these drugs with CYP3A4 inhibitors leads to increased plasma concentrations of the statin, significantly increasing the risk of skeletal muscle toxicity (rhabdomyolysis). **3. NEET-PG High-Yield Clinical Pearls:** * **CYP3A4 Metabolized:** Simvastatin, Lovastatin, Atorvastatin (Mnemonic: **SLA**p the 3A4). * **CYP2C9 Metabolized:** Rosuvastatin and Fluvastatin. * **Non-CYP Metabolized:** Pravastatin and Pitavastatin (Safest regarding CYP interactions). * **Potency:** Rosuvastatin is the most potent statin, followed by Atorvastatin. * **Prodrugs:** Lovastatin and Simvastatin are administered as inactive lactones (prodrugs); others are active. * **Timing:** Statins with short half-lives (Simvastatin, Pravastatin) should be taken at **bedtime** because cholesterol synthesis peaks between midnight and 2:00 AM. Atorvastatin and Rosuvastatin have long half-lives and can be taken any time.

Question 1

Ivabradine is used for the management of which condition?

Accepted Answer

Stable angina

Answer

Pre-renal azotemia

Answer

Alzheimer's disease

Answer

Smoking cessation

Question 2

Calcium dobesilate is used in the treatment of varicose veins because of which of the following mechanisms, except:

Accepted Answer

Increases release of matrix metalloproteinases (MMPs)

Answer

Reduces edema

Answer

Improves macrophage-mediated proteolysis

Answer

Improves lymph flow

Question 3

A 55-year-old cardiac patient on long-term treatment presents for a follow-up visit. The physician observes a specific finding on ophthalmological examination. Which drug prescribed by the physician is most likely responsible for this finding?

Accepted Answer

Amiodarone

Answer

Digoxin

Answer

Verapamil

Answer

Propranolol

Question 4

Which drug is contraindicated in bilateral renal artery stenosis?

Accepted Answer

Captopril

Answer

Propranolol

Answer

Guanethidine

Answer

Amlodipine

Question 5

Sudden withdrawal of which of the following drugs could result in serious adverse cardiovascular changes in a patient taking the drug over a long time?

Accepted Answer

Clonidine (α2 agonist)

Answer

Phenelzine (MAO inhibitor)

Answer

Enalapril (ACE inhibitor)

Answer

Fluoxetine (serotonin reuptake inhibitor)

Question 6

What is the biochemical mechanism of action of digitalis?

Accepted Answer

An increase in systolic intracellular calcium levels

Answer

An increase in conduction from the atria to the ventricle

Answer

An increase in ATP synthesis

Answer

A block of calcium channels

Question 7

Which of the following is NOT true about fibrates?

Accepted Answer

Absorption is delayed by a fatty meal

Answer

Drug of choice for type III hyperlipoproteinemia and severe hypertriglyceridemia

Answer

Activate PPAR-alpha to stimulate LPL

Answer

Side effects include rash, urticaria, myalgia, and impotence

Question 8

Enalapril increases the levels of which of the following?

Accepted Answer

Bradykynin

Answer

Interferon

Answer

Platelet-activating factor (PAF)

Answer

Tumor necrosis factor (TNF)

Question 9

All of the following drugs can be used in hypertensive crisis except?

Accepted Answer

Pindolol

Answer

Labetalol

Answer

Nitroprusside

Answer

Nifedipine

Question 10

Which statin is not metabolized by CYP3A4?

Accepted Answer

Pravastatin

Answer

Lovastatin

Answer

Simvastatin

Answer

Atorvastatin

Cardiovascular Drugs — MCQs

Cardiovascular Drugs — MCQs

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