Cardiology Practice Questions

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.

Q: Which of the following conditions is associated with AV block?

Hypothyroidism. **Explanation:** **Correct Answer: A. Hypothyroidism** Hypothyroidism is a well-recognized cause of reversible Atrioventricular (AV) block. Thyroid hormones exert a direct effect on the cardiac conduction system by regulating the expression of ion channels (like $Na^+/K^+$ ATPase) and calcium-handling proteins. In a hypothyroid state, there is a decrease in sympathetic activity and a prolongation of the action potential duration, leading to **sinus bradycardia** and delayed conduction through the AV node. This can manifest as a First-degree AV block or, in severe cases (like Myxedema coma), higher-grade blocks. **Incorrect Options:** * **B. Hyperthyroidism:** Excess thyroid hormone increases the sensitivity of $̢$-adrenergic receptors. This typically leads to **tachyarrhythmias**, most notably sinus tachycardia and **Atrial Fibrillation** [2]. * **C. Cushing Disease:** Excess cortisol leads to hypertension and metabolic alkalosis. While it causes structural changes like Left Ventricular Hypertrophy (LVH), it is not a classic cause of AV block. * **D. Pheochromocytoma:** Catecholamine excess leads to paroxysmal hypertension and **tachyarrhythmias** (sinus tachycardia, PVCs, or VT). It does not cause conduction delays. **High-Yield Clinical Pearls for NEET-PG:** * **ECG in Hypothyroidism:** Look for the "Hypothyroid Triad": Sinus bradycardia, Low voltage complexes, and T-wave inversions [3]. * **Reversibility:** AV blocks caused by hypothyroidism are often reversible with Levothyroxine replacement, potentially avoiding the need for a permanent pacemaker [1]. * **Other Metabolic Causes of AV Block:** Hyperkalemia, Hypermagnesemia, and Digoxin toxicity [3].

Question 1

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 2

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 3

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 4

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 5

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 6

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 7

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 8

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

Question 9

Which of the following conditions is associated with AV block?

Accepted Answer

Hypothyroidism

Answer

Hyperthyroidism

Answer

Cushing disease

Answer

Pheochromocytoma

Question 10

A 55-year-old man presents with chest discomfort, fatigue, and palpitations. His blood pressure is 85/50 mm Hg and heart rate is 140 beats per minute. Which of the following is the best treatment for this patient?

Accepted Answer

Cardioversion

Answer

Digoxin

Answer

Calcium channel blocker

Answer

Coumadin

Cardiology — MCQs

Cardiology — MCQs

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