Cardiovascular Drugs Practice Questions

Q: What is the minimum recommended starting dosage of Candesartan?

2 mg. **Explanation:** **Candesartan cilexetil** is a potent, long-acting Angiotensin II Receptor Blocker (ARB) used primarily in the management of hypertension and heart failure. **Why 2 mg is the correct answer:** In clinical practice, the standard starting dose for hypertension in adults is typically 8 mg once daily. However, the **minimum recommended starting dose is 2 mg**. This low dose is specifically indicated for patients with **intravascular volume depletion** (e.g., those on high-dose diuretics) or patients with **hepatic impairment**, to avoid the risk of profound first-dose hypotension. For pediatric patients (ages 1 to <6 years), the starting dose is also calculated based on weight, often beginning at low increments. **Analysis of Incorrect Options:** * **B (40 mg):** This is incorrect as it exceeds the maximum recommended daily dose for hypertension, which is typically **32 mg**. * **C (20 mg) & D (30 mg):** These are not standard starting doses. While Candesartan is available in various strengths, the titration usually follows a doubling pattern (2mg → 4mg → 8mg → 16mg → 32mg). **High-Yield Clinical Pearls for NEET-PG:** * **Mechanism of Action:** Selective AT1 receptor antagonist; it does not inhibit ACE, thus it does not increase bradykinin levels (lower incidence of dry cough compared to ACE inhibitors). * **Prodrug Status:** Candesartan cilexetil is a **prodrug** that is completely converted to the active moiety, candesartan, during gastrointestinal absorption. * **Heart Failure (HFrEF):** The target dose in heart failure (based on the CHARM study) is **32 mg once daily**, starting from 4 mg. * **Contraindication:** Like all drugs acting on the RAAS, it is **absolutely contraindicated in pregnancy** due to teratogenicity (fetal renal toxicity).

Q: Which of the following agents is a Class C antiarrhythmic drug?

Amiodarone. The classification of antiarrhythmic drugs follows the **Vaughan-Williams classification**, which categorizes agents based on their primary mechanism of action on the cardiac action potential. ### **Explanation of the Correct Answer** **Amiodarone** is the correct answer because it is the prototype **Class III** antiarrhythmic agent. These drugs primarily act by **blocking potassium (K+) channels**, which prolongs the duration of the action potential and the effective refractory period (ERP). While Amiodarone also possesses Class I, II, and IV properties, its dominant clinical effect is Class III. ### **Analysis of Incorrect Options** * **Quinine (Option A):** This is an antimalarial. Its isomer, **Quinidine**, is a **Class IA** antiarrhythmic. Class IA drugs block sodium channels and prolong the action potential. * **Propranolol (Option C):** This is a **Class II** antiarrhythmic. These are beta-blockers that decrease sympathetic activity, slowing the heart rate and AV conduction. * **Lignocaine (Option D):** This is a **Class IB** antiarrhythmic. It blocks sodium channels specifically in the inactivated state and is primarily used for ventricular arrhythmias, especially post-myocardial infarction. ### **High-Yield Clinical Pearls for NEET-PG** * **Amiodarone Side Effects:** Highly high-yield! Remember the "6 Ps": **P**ulmonary fibrosis, **P**hotodermatitis (Blue-grey skin), **P**eripheral neuropathy, **P**rolonged QT interval, **P**apillary (Corneal) microdeposits, and **P**roblems with Thyroid (Hypo/Hyperthyroidism due to high iodine content). * **Class IC Agents:** (e.g., Flecainide) are the most potent sodium channel blockers and are contraindicated post-MI. * **Drug of Choice:** Adenosine is the DOC for Paroxysmal Supraventricular Tachycardia (PSVT).

Q: Which of the following drugs can be used for both prophylaxis and treatment of angina?

Isosorbide dinitrate. **Explanation:** The correct answer is **Isosorbide dinitrate (ISDN)**. **1. Why Isosorbide dinitrate is correct:** Nitrates are the mainstay of angina management due to their ability to cause peripheral vasodilation (venodilation > arteriodilation), which reduces cardiac preload and myocardial oxygen demand. * **Treatment (Acute Attack):** When administered **sublingually**, ISDN has a rapid onset of action (2–5 minutes), making it effective for terminating an acute anginal episode. * **Prophylaxis (Chronic Management):** When administered **orally**, it has a longer duration of action (4–6 hours), making it suitable for preventing future attacks. **2. Analysis of Incorrect Options:** * **Isosorbide mononitrate (ISMN):** While it is an excellent drug for **prophylaxis** due to its high oral bioavailability and long half-life, it is not used for acute treatment because it is only available in oral formulations and lacks a rapid-onset sublingual form. * **Thyroxine:** This increases the metabolic rate and heart rate, which elevates myocardial oxygen demand. It can actually **precipitate or worsen** angina. * **Sumatriptan:** A 5-HT$_{1B/1D}$ agonist used for migraines, it can cause **coronary vasospasm** (Prinzmetal angina) and is strictly contraindicated in patients with ischemic heart disease. **3. NEET-PG High-Yield Pearls:** * **Nitrate Tolerance:** Continuous exposure leads to reduced efficacy (depletion of free sulfhydryl groups). To prevent this, a **"Nitrate-free interval"** of 8–12 hours (usually at night) is mandatory. * **Drug Interaction:** Nitrates are absolutely contraindicated with **Sildenafil** (PDE-5 inhibitors) as the combination can cause life-threatening hypotension. * **DOC for Acute Angina:** Sublingual Nitroglycerin (Glyceryl Trinitrate) remains the first choice for immediate relief.

Q: Which of the following is a bile acid sequestrant?

Resin. **Explanation:** **Bile Acid Sequestrants (Resins)** are a class of lipid-lowering agents that include **Cholestyramine, Colestipol, and Colesevelam** [1, 2]. These are large, positively charged polymers that bind to negatively charged bile acids in the intestinal lumen [1]. By preventing the enterohepatic circulation of bile acids, they force the liver to convert more cholesterol into new bile acids [1]. This leads to an upregulation of LDL receptors on hepatocytes, resulting in decreased serum LDL levels [1]. **Analysis of Options:** * **Option B (Resin):** Correct. As described above, resins are the primary bile acid sequestrants [1, 2]. * **Option A (Atorvastatin):** Incorrect. This belongs to the **HMG-CoA Reductase Inhibitors** class, which inhibits the rate-limiting step of cholesterol synthesis [2]. * **Option C (Fibrates):** Incorrect. Drugs like Fenofibrate and Gemfibrozil are **PPAR-alpha agonists** that primarily lower triglycerides by increasing the activity of lipoprotein lipase [2]. * **Option D (Niacin):** Incorrect. Also known as Vitamin B3, it inhibits lipolysis in adipose tissue and reduces hepatic VLDL synthesis [2]. **High-Yield Clinical Pearls for NEET-PG:** * **Side Effects:** Resins often cause GI distress (bloating, constipation) and can cause **hypertriglyceridemia** (they are contraindicated if baseline triglycerides are >300 mg/dL) [2]. * **Drug Interactions:** They interfere with the absorption of fat-soluble vitamins (A, D, E, K) and acidic drugs like Warfarin, Digoxin, and Thiazides [1]. * **Safe Population:** Colesevelam is often considered the drug of choice for treating hypercholesterolemia during **pregnancy**.

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

Stimulation of guanylate cyclase. **Mechanism of Action: Sodium Nitroprusside (SNP)** Sodium nitroprusside is a potent, rapid-acting parenteral vasodilator used in hypertensive emergencies [1][2]. Its primary mechanism involves the release of **Nitric Oxide (NO)**. 1. **Why Option B is Correct:** SNP is a prodrug that reacts with sulfhydryl groups on erythrocytes and tissue proteins to release inorganic iodine and NO [4]. NO activates the enzyme **soluble guanylate cyclase**, which increases the conversion of GTP to **cyclic GMP (cGMP)** [3][4]. Elevated cGMP levels lead to dephosphorylation of myosin light chains, resulting in profound relaxation of both **arterioles and venules** (balanced vasodilator) [1][3]. 2. **Why Other Options are Incorrect:** * **Option A (Increased cAMP):** This is the mechanism for drugs like Milrinone (PDE-3 inhibitor) or Beta-2 agonists, not SNP. * **Option C (CCBs):** Drugs like Nifedipine or Amlodipine work by blocking L-type calcium channels to prevent contraction; SNP works via the NO-cGMP pathway. * **Option D (Potassium channel openers):** Drugs like Minoxidil, Diazoxide, and Hydralazine act by opening K+ channels, leading to hyperpolarization [1]. **High-Yield NEET-PG Pearls:** * **Balanced Vasodilator:** Unlike Hydralazine (arteriolar only), SNP reduces both **Preload** and **Afterload** [1]. * **Toxicity:** Metabolism of SNP releases **Cyanide** and **Thiocyanate**. * *Cyanide toxicity treatment:* Sodium thiosulfate, Sodium nitrite, or Hydroxocobalamin. * **Light Sensitivity:** SNP is unstable in light; the infusion bottle must be covered with opaque foil. * **Drug of Choice:** Historically used for hypertensive emergencies and aortic dissection (along with beta-blockers) [2].

Q: All of the following statements about nesiritide are true EXCEPT:

It can be administered orally. Nesiritide is a recombinant form of human B-type Natriuretic Peptide (BNP) [1]. The correct answer is Option C because Nesiritide, being a polypeptide, is degraded by gastrointestinal enzymes if taken orally. Therefore, it must be administered via intravenous (IV) infusion. Analysis of Options: * Option A (True): It is a synthetic analogue of endogenous BNP, produced using recombinant DNA technology [1], [3]. * Option B (True): It is specifically indicated for the management of acutely decompensated congestive heart failure (CHF) in patients who have dyspnea at rest or with minimal exertion [1]. It helps by reducing pulmonary capillary wedge pressure (PCWP). * Option D (True): As a natriuretic peptide, it stimulates guanylyl cyclase, increasing cGMP [2]. This leads to potent vasodilation and natriuresis (excretion of sodium in the urine), which helps reduce fluid overload. Clinical Pearls for NEET-PG: 1. Mechanism of Action: Increases cGMP in vascular smooth muscle and kidney cells, leading to balanced vasodilation (venous and arterial) and diuresis [1], [2]. 2. Hemodynamic Effects: It reduces both Preload (venous dilation) and Afterload (arterial dilation) without increasing heart rate (unlike dobutamine). 3. Side Effects: The most common dose-limiting side effect is hypotension. There have also been concerns regarding its impact on renal function (potential increase in serum creatinine). 4. Half-life: It has a short half-life of approximately 18 minutes.

Question 1

What is the minimum recommended starting dosage of Candesartan?

Accepted Answer

2 mg

Answer

40 mg

Answer

20 mg

Answer

30 mg

Question 2

Which drugs are involved in the bradycardia algorithm?

Accepted Answer

Atropine, Dopamine, Epinephrine

Answer

Atropine, Norepinephrine, Dopamine

Answer

Atropine, Isoproterenol, Norepinephrine

Answer

Atropine, Dobutamine, Amiodarone

Question 3

Which of the following agents is a Class C antiarrhythmic drug?

Accepted Answer

Amiodarone

Answer

Quinine

Answer

Propranolol

Answer

Lignocaine

Question 4

Which of the following drugs can be used for both prophylaxis and treatment of angina?

Accepted Answer

Isosorbide dinitrate

Answer

Isosorbide mononitrate

Answer

Thyroxine

Answer

Sumatriptan

Question 5

Which of the following is a bile acid sequestrant?

Accepted Answer

Resin

Answer

Atorvastatin

Answer

Fibrates

Answer

Niacin

Question 6

Which of the following statements regarding verapamil is incorrect?

Accepted Answer

It is contraindicated in patients with supraventricular tachycardia.

Answer

It does not produce reflex tachycardia.

Answer

It is less potent as a coronary vasodilator.

Answer

It can cause constipation.

Question 7

What is the mechanism of action of Sodium nitroprusside?

Accepted Answer

Stimulation of guanylate cyclase

Answer

Increased cAMP

Answer

Calcium channel blockers

Answer

Potassium channel blocker

Question 8

All of the following are true about HMG CoA reductase inhibitors except:

Accepted Answer

Fibrinogen levels are increased by pravastatin.

Answer

CNS accumulation of simvastatin and lovastatin is high, and less for pravastatin and fluvastatin.

Answer

Simvastatin is rapidly and pravastatin is least metabolized.

Answer

Bioavailability is minimally modified when pravastatin is taken with food.

Question 9

Tolazoline is used as:

Accepted Answer

A vasodilator in treating coronary artery stenosis during angioplasty procedures

Answer

A thrombin inhibitor in peripheral angiography

Answer

A vasoconstrictor in the treatment of varices

Answer

An antispasmodic during biliary spasm

Question 10

All of the following statements about nesiritide are true EXCEPT:

Accepted Answer

It can be administered orally

Answer

It is a BNP analogue

Answer

It can be used in decompensated CHF

Answer

It causes loss of Na+ in the urine

Cardiovascular Drugs — MCQs

Cardiovascular Drugs — MCQs

On this page

Practice by Chapter

Want unlimited practice?