Cardiology Practice Questions

Q: Long-term secondary prevention following myocardial infarction is recommended with which one of the following drug classes?

Antiplatelet drugs. **Explanation:** **Why Antiplatelet drugs are correct:** Following a Myocardial Infarction (MI), the primary goal of secondary prevention is to prevent recurrent thrombotic events and stent thrombosis. **Antiplatelet therapy** (specifically Aspirin and P2Y12 inhibitors like Clopidogrel or Ticagrelor) is the cornerstone of this strategy. These drugs inhibit platelet aggregation, thereby preventing the formation of a white thrombus over a ruptured atherosclerotic plaque or within a coronary stent. Clinical trials have consistently shown that long-term antiplatelet therapy significantly reduces the risk of re-infarction and cardiovascular mortality. **Why the other options are incorrect:** * **Nitrates:** While excellent for acute symptomatic relief of angina (vasodilation), they do not improve long-term survival or prevent future MI. * **Amiodarone:** This is an anti-arrhythmic used for specific rhythm disturbances (like VT/VF). It is not used for routine secondary prevention due to its significant side-effect profile (pulmonary fibrosis, thyroid dysfunction) and lack of mortality benefit in post-MI patients without specific arrhythmias. * **Calcium Channel Antagonists (CCBs):** These are generally second-line agents. While they can be used for hypertension or angina, they do not offer the same robust secondary prevention benefits as Beta-blockers or ACE inhibitors. In fact, short-acting nifedipine is contraindicated post-MI. **High-Yield Clinical Pearls for NEET-PG:** * **Standard Post-MI "Mnemonic" (BAAS):** **B**eta-blockers, **A**CE inhibitors (or ARBs), **A**ntiplatelets (DAPT), and **S**tatins. These four classes are proven to reduce mortality. * **DAPT Duration:** Dual Antiplatelet Therapy (DAPT) is typically recommended for **12 months** post-ACS, regardless of whether a stent was placed. * **Aspirin Dose:** Low-dose aspirin (75–150 mg) is continued indefinitely for life.

Q: A 70-year-old man has isolated systolic hypertension. On examination, his blood pressure is 170/80 mmHg, and his heart and lungs are normal. He has no other medical conditions. For this patient, select the most appropriate medication to manage his high blood pressure.

Thiazides. ### Explanation **1. Why Thiazides are the Correct Choice:** Isolated Systolic Hypertension (ISH), defined as SBP ≥140 mmHg with DBP <90 mmHg, is common in elderly patients due to age-related arterial stiffness. Large-scale clinical trials (like SHEP and ALLHAT) have established **Thiazide-type diuretics** and **Long-acting Dihydropyridine Calcium Channel Blockers (CCBs)** as the first-line agents for ISH. Thiazides are preferred because they effectively reduce stroke risk, cardiovascular events, and mortality in this specific demographic. **2. Why the Other Options are Incorrect:** * **B. Spironolactone:** This is a potassium-sparing diuretic/aldosterone antagonist. It is generally used as an add-on therapy for resistant hypertension or in patients with heart failure (HFrEF). It is not a first-line agent for uncomplicated ISH. * **C. Clonidine:** A centrally acting alpha-2 agonist. It is associated with significant side effects like sedation, dry mouth, and the risk of rebound hypertension if discontinued abruptly. It is never a first-line choice for chronic hypertension management. * **D. Prazosin:** An alpha-1 blocker. While it can lower BP, it is primarily used in patients with concomitant Benign Prostatic Hyperplasia (BPH). It is associated with "first-dose hypotension" and is not recommended as monotherapy for hypertension. **3. NEET-PG High-Yield Pearls:** * **Definition of ISH:** SBP >140 and DBP <90 mmHg. * **First-line for Elderly/ISH:** Thiazides (e.g., Chlorthalidone) or CCBs (e.g., Amlodipine). * **Chlorthalidone vs. Hydrochlorothiazide:** Chlorthalidone is often preferred in exams/clinical practice due to its longer half-life and superior evidence in reducing CV events. * **Side Effects of Thiazides:** Hyper**G**lycemia, Hyper**L**ipidemia, Hyper**U**ricemia, and Hyper**C**alcemia (**GLUC**), but **Hypo**kalemia and **Hypo**natremia.

Q: What is true about Pulsus bisferiens?

Has a double peak, both occurring in systole. **Explanation:** **Pulsus bisferiens** (from the Latin *bis* meaning twice and *ferire* meaning to beat) is a physical finding characterized by a double systolic peak in the arterial pulse. 1. **Why Option B is Correct:** The pulse waveform in bisferiens consists of two distinct peaks, both occurring during **ventricular systole**. The first peak is the **Percussion wave** (due to rapid early systolic ejection), and the second is the **Tidal wave** (due to reflected waves from the periphery or continued ejection). These peaks are separated by a mid-systolic dip. 2. **Why the other options are Incorrect:** * **Option A:** A pulse with one peak in systole and another in diastole is called a **Dicrotic pulse** (seen in low cardiac output states like severe heart failure or sepsis) [1]. * **Option C:** Dilated cardiomyopathy typically presents with a dicrotic pulse or pulsus alternans, not bisferiens. Bisferiens is characteristic of **Hypertrophic Obstructive Cardiomyopathy (HOCM)**. * **Option D:** While bisferiens is classically seen in **AR associated with AS** (where AR is predominant), it is also seen in **isolated severe AR** [1] and **HOCM**. Therefore, saying it is "only" seen in the combination is incorrect. **NEET-PG High-Yield Pearls:** * **Best site to palpate:** Carotid artery (though it can be felt peripherally in AR) [2]. * **Differential Diagnosis:** 1. **AR + AS** (AR must be the dominant lesion). 2. **Isolated Severe AR** [1]. 3. **HOCM** (The "spike and dome" pattern). * **Mechanism in HOCM:** The first peak is the rapid ejection, the dip is due to mid-systolic obstruction (SAM of mitral valve), and the second peak is the continued ejection.

Q: Which of the following drugs is NOT indicated in the management of dilated cardiomyopathy?

Calcium channel blockers. Explanation: Dilated Cardiomyopathy (DCM) is characterized by ventricular dilation and impaired systolic function (reduced ejection fraction). The management strategy focuses on reversing ventricular remodeling and improving cardiac output [2]. Why Calcium Channel Blockers (CCBs) are NOT indicated: Non-dihydropyridine CCBs (like **Verapamil and Diltiazem**) are generally contraindicated in DCM because they possess significant **negative inotropic effects** [1]. In a heart that already has failing contractility, these drugs can further depress systolic function and exacerbate heart failure symptoms. While certain dihydropyridines (like Amlodipine) are safe if needed for hypertension, CCBs are not part of the standard therapeutic regimen for DCM. Why the other options are wrong (Standard Therapy): * **ACE Inhibitors (e.g., Enalapril):** These are first-line agents. They reduce afterload and preload and, most importantly, prevent and reverse **cardiac remodeling**, significantly reducing mortality [3]. * **Beta-blockers (e.g., Carvedilol, Metoprolol succinate):** Once the patient is stable, beta-blockers are essential to counteract the chronic sympathetic overactivity, improve EF over time, and prevent arrhythmias. * **Spironolactone (Aldosterone Antagonist):** Indicated in patients with persistent symptoms (NYHA Class II-IV). It prevents myocardial fibrosis and reduces mortality. High-Yield Clinical Pearls for NEET-PG: * **Mnemonic for Mortality-Reducing Drugs in HFrEF/DCM:** **B-A-S-H** (Beta-blockers, ACE inhibitors/ARBs, Spironolactone, Hydralazine + Nitrates). * **Most common cause of DCM:** Idiopathic (Genetic/Familial in 30% of cases). * **Reversible causes of DCM:** Alcohol (most common toxin), Beriberi (Thiamine deficiency), Tachycardia-induced, and Peripartum cardiomyopathy [2]. * **Drug of Choice for symptomatic relief (but no mortality benefit):** Diuretics and Digoxin.

Q: The first heart sound is soft in all except:

Short PR interval. The intensity of the **First Heart Sound (S1)** is primarily determined by the position of the mitral valve leaflets at the onset of ventricular systole and the rate of pressure rise within the ventricle. [1] ### Why "Short PR Interval" is Correct In a **Short PR interval**, the time between atrial contraction and ventricular contraction is very brief. The mitral valve leaflets are still wide open and deep in the ventricular cavity when systole begins [1]. The leaflets must travel a long distance to close, slamming shut with high velocity, which results in a **loud (accentuated) S1**. Conversely, a long PR interval allows the leaflets to float back toward a semi-closed position before systole, leading to a soft S1 [1]. ### Explanation of Incorrect Options (Causes of Soft S1) * **Mitral Regurgitation:** The leaflets fail to coapt properly or are structurally compromised, leading to an inadequate "seal" and a diminished closing sound. * **Calcified Valve:** In severe mitral stenosis with a rigid, calcified valve, the leaflets lose their mobility. The lack of pliable movement results in a muffled or soft S1. * **Ventricular Septal Defect (VSD):** Large VSDs or those associated with heart failure often result in a soft S1 due to the slower rate of pressure rise in the left ventricle (reduced dP/dt) as blood shunts immediately into the lower-pressure right ventricle. ### NEET-PG High-Yield Pearls * **Loud S1:** Short PR interval, Mitral Stenosis (mobile/pliable valve), Tachycardia, Hyperdynamic states (Anemia, Pregnancy, Thyrotoxicosis). * **Soft S1:** Long PR interval (1st-degree heart block), Mitral Regurgitation, Calcified Mitral Valve, Obesity/COPD (increased chest wall distance). * **Variable S1:** Atrial Fibrillation and Complete Heart Block (due to varying PR intervals).

Q: Which of the following drugs is NOT used in the management of unstable angina?

Lidocaine by bolus infusion. **Explanation:** The management of **Unstable Angina (UA)** focuses on stabilizing the atherosclerotic plaque, preventing further thrombus formation, and reducing myocardial oxygen demand. **Why Lidocaine is the Correct Answer:** Lidocaine is a Class IB anti-arrhythmic agent [2]. Historically, it was used prophylactically to prevent ventricular fibrillation in acute myocardial infarction. However, current guidelines **do not recommend** its use in UA or NSTEMI unless the patient develops specific ventricular arrhythmias (like VT or VF). It has no role in the primary management of ischemia or the underlying thrombotic process and may even increase the risk of asystole in some patients. **Analysis of Incorrect Options:** * **Aspirin:** This is the cornerstone of therapy. It inhibits cyclooxygenase-1 (COX-1), preventing the formation of Thromboxane A2, thereby inhibiting platelet aggregation [1]. It should be administered immediately to all patients with suspected UA. * **Intravenous Heparin:** Anticoagulation (using UFH or LMWH) is essential in UA to prevent the progression of a partial thrombus to a complete occlusion of the coronary artery. * **Intravenous Nitroglycerin:** Nitrates are used to relieve chest pain by causing venodilation (reducing preload) and coronary vasodilation, which improves myocardial oxygen supply and reduces demand [1]. **High-Yield Clinical Pearls for NEET-PG:** * **MONA-B** is the classic mnemonic for ACS: **M**orphine, **O**xygen, **N**itrates, **A**spirin, and **B**eta-blockers. * **Lidocaine Toxicity:** Look for CNS symptoms (seizures, perioral numbness, or

Q: Wide pulse pressure may be seen in all the following conditions except:

Congestive heart failure. Pulse pressure is the difference between systolic and diastolic blood pressure. A **wide pulse pressure** (typically >40-60 mmHg) occurs due to either an increased stroke volume or decreased peripheral vascular resistance/aortic compliance [1]. **Why Congestive Heart Failure (CHF) is the correct answer:** In CHF, the heart's pumping ability is compromised, leading to a **decreased stroke volume** [2]. To compensate for low cardiac output, the sympathetic nervous system increases systemic vascular resistance (vasoconstriction), which raises diastolic pressure. The combination of low systolic output and high diastolic resistance results in a **narrow pulse pressure**, not a wide one. **Analysis of Incorrect Options:** * **Aortic Regurgitation:** This is the classic cause of wide pulse pressure. Blood leaks back into the ventricle during diastole (lowering diastolic pressure) and is ejected as a massive stroke volume in the next systole (raising systolic pressure) [1]. * **Patent Ductus Arteriosus (PDA):** Similar to aortic regurgitation, blood shunts from the aorta to the pulmonary artery during diastole (lowering diastolic pressure), while the compensatory increase in stroke volume raises systolic pressure. * **Complete Heart Block:** Due to the very slow heart rate, there is prolonged ventricular filling time. This leads to a massive increase in stroke volume (Starling’s Law), significantly raising systolic blood pressure and widening the pulse pressure. **High-Yield Clinical Pearls for NEET-PG:** * **Water-hammer pulse (Corrigan’s pulse)** is the clinical manifestation of wide pulse pressure in Aortic Regurgitation [1]. * **Other causes of wide pulse pressure:** Thyrotoxicosis, Fever, Anemia, Beriberi, and Atherosclerosis (due to stiffened aorta). * **Pulsus Alternans** is a hallmark physical finding in severe Congestive Heart Failure.

Question 1

Long-term secondary prevention following myocardial infarction is recommended with which one of the following drug classes?

Accepted Answer

Antiplatelet drugs

Answer

Nitrates

Answer

Amiodarone

Answer

Calcium channel antagonists

Question 2

A 70-year-old man has isolated systolic hypertension. On examination, his blood pressure is 170/80 mmHg, and his heart and lungs are normal. He has no other medical conditions. For this patient, select the most appropriate medication to manage his high blood pressure.

Accepted Answer

Thiazides

Answer

Spironolactone

Answer

Clonidine

Answer

Prazosin

Question 3

What would be the first line of treatment if a patient develops ventricular fibrillation after intravenous injection of potassium chloride?

Accepted Answer

Defibrillation

Answer

Cardiac massage

Answer

Intravenous adrenaline

Answer

Intermittent positive-pressure ventilation (IPPV)

Question 4

What is true about Pulsus bisferiens?

Accepted Answer

Has a double peak, both occurring in systole

Answer

Has a double peak, one in systole and another in diastole

Answer

Is seen in patients with dilated cardiomyopathy

Answer

Is seen only when aortic stenosis is associated with aortic regurgitation

Question 5

Which of the following drugs is NOT indicated in the management of dilated cardiomyopathy?

Accepted Answer

Calcium channel blockers

Answer

Beta-blockers

Answer

Spironolactone

Answer

ACE inhibitors

Question 6

The first heart sound is soft in all except:

Accepted Answer

Short PR interval

Answer

Ventricular septal defect

Answer

Mitral regurgitation

Answer

Calcified valve

Question 7

Which of the following drugs is NOT used in the management of unstable angina?

Accepted Answer

Lidocaine by bolus infusion

Answer

Intravenous heparin

Answer

Aspirin

Answer

Intravenous nitroglycerin

Question 8

Which of the following is a treatable cause of restrictive cardiomyopathy (RCM)?

Accepted Answer

Fabry's disease

Answer

Amyloidosis

Answer

Endomyocardial fibroelastosis

Answer

Hypereosinophilic syndrome

Question 9

Wide pulse pressure may be seen in all the following conditions except:

Accepted Answer

Congestive heart failure

Answer

Aortic regurgitation

Answer

Patent ductus arteriosus

Answer

Complete heart block

Question 10

A 75-year-old man presents with a sudden syncopal episode while playing with his grandchildren. He is currently alert and describes occasional substernal heaviness and shortness of breath. His lungs have bibasilar rales, and his BP is 120/80 mmHg. What is the classical auscultatory finding expected in this patient?

Accepted Answer

Ejection systolic murmur with Soft S2

Answer

Ejection systolic murmur with wide split S2

Answer

Harsh Holosystolic murmur with soft S2

Answer

Harsh pan-systolic murmur with loud S2

Cardiology — MCQs

Cardiology — MCQs

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