Cardiology Practice Questions

Q: What is the most common complication of infective endocarditis?

Embolisation. **Explanation:** **1. Why Embolisation is the Correct Answer:** Embolisation is considered the **most common complication** of Infective Endocarditis (IE), occurring in approximately **20% to 50%** of patients. It occurs when fragments of the friable vegetation (composed of platelets, fibrin, and microorganisms) break off and travel through the systemic or pulmonary circulation. Left-sided IE typically leads to systemic emboli (most commonly to the brain/spleen), while right-sided IE leads to pulmonary emboli. **2. Analysis of Incorrect Options:** * **A. Congestive Cardiac Failure (CCF):** While CCF is the **most common cause of death** in patients with IE and the most common indication for surgery, it is statistically less frequent than embolic events. * **C. Regurgitation:** Valvular regurgitation is the primary *mechanism* leading to CCF in IE due to leaflet destruction or chordae rupture, but it is categorized as a structural lesion rather than the most frequent clinical complication. * **D. Sudden Death:** This is a rare outcome, usually resulting from a massive embolus to the left main coronary artery or a catastrophic conduction block (ring abscess). **3. NEET-PG High-Yield Pearls:** * **Most common cause of death in IE:** Congestive Cardiac Failure (CCF). * **Most common embolic site:** The Brain (Middle Cerebral Artery territory), leading to stroke. * **Risk Factor for Embolism:** Vegetation size **>10 mm** and mobile vegetations on the mitral valve carry the highest risk. * **Splenic Infarction:** This is the most common *silent* embolic event. * **Duke’s Criteria:** Remember that "Arterial Emboli" is a **Minor Criterion** for diagnosis.

Q: Loud S1 in Mitral Stenosis is seen in which of the following conditions?

Prolonged flow through the mitral valve. ### Explanation In Mitral Stenosis (MS), the intensity of the first heart sound (S1) depends on the mobility of the valve leaflets and their position at the onset of ventricular systole [1]. **1. Why "Prolonged flow through the mitral valve" is correct:** In MS, the narrowed orifice creates a pressure gradient between the left atrium and left ventricle that persists throughout diastole. This **prolonged flow** keeps the mitral valve leaflets wide open and deep in the ventricular cavity until the very end of diastole. When ventricular systole begins, the leaflets must travel a long distance to close, slamming shut with high velocity. This "wide excursion" results in a **Loud (accentuated) S1** [1]. **2. Why the other options are incorrect:** * **First-degree heart block:** This involves a prolonged PR interval. The extra time allows the mitral leaflets to float back toward a semi-closed position before systole begins. Since the leaflets have a shorter distance to travel, S1 becomes **soft/muffled**. * **Calcification of the mitral valve:** For S1 to be loud, the leaflets must be pliable. Heavy calcification stiffens the valve, reducing its mobility and vibration, which leads to a **soft or absent S1** [2]. * **Immobilization of the mitral valve:** Similar to calcification, if the valve is "fixed" or immobile (as seen in severe, rigid MS), it cannot snap shut, resulting in a **soft S1**. **Clinical Pearls for NEET-PG:** * **Loud S1 in MS** signifies a **pliable (mobile)** valve [1]. * **Soft S1 in MS** is a clinical sign of a **calcified/rigid** valve or co-existing Mitral Regurgitation [2]. * **The "Tapping" Apex Beat** in MS is actually the palpable manifestation of a Loud S1. * Other causes of Loud S1: Short PR interval (WPW syndrome), Tachycardia, and High output states (Anemia, Hyperthyroidism).

Q: A 35-year-old woman presents for a regular health check-up. She denies any current medical problems except for a childhood hospitalization for a throat infection. Examination reveals normal vital signs. On physical examination, normal S1 and S2 with a late rumbling diastolic murmur heard at the apex, enhanced by expiration. Which of the following skin lesions may have accompanied the illness?

Erythema marginatum. The clinical presentation describes a 35-year-old woman with a **late rumbling diastolic murmur** at the apex, which is the classic auscultatory finding of **Mitral Stenosis (MS)**. The history of childhood hospitalization for a throat infection strongly suggests **Acute Rheumatic Fever (ARF)** as the underlying etiology, leading to chronic Rheumatic Heart Disease [1]. **Why Erythema Marginatum is correct:** Erythema marginatum is one of the **Major Jones Criteria** for the diagnosis of Acute Rheumatic Fever [1]. It is a distinctive, pink, non-pruritic, evanescent rash with serpiginous (snake-like) borders, typically found on the trunk and proximal extremities. It occurs in the early stages of the illness that leads to the valvular damage seen in this patient. **Analysis of Incorrect Options:** * **A. Erythema migrans:** The characteristic "bull's-eye" rash associated with **Lyme disease** (caused by *Borrelia burgdorferi*). * **C. Erythema multiforme:** A hypersensitivity reaction (often "target" lesions) commonly triggered by **Herpes Simplex Virus (HSV)** or certain medications. * **D. Janeway lesion:** Small, painless, erythematous macules on the palms or soles, which are a peripheral sign of **Infective Endocarditis**, not Rheumatic Fever [2]. **NEET-PG High-Yield Pearls:** * **Jones Criteria (Revised):** Remember the mnemonic **J♥NES** (Joints-polyarthritis, ♥-Carditis, Nodules-subcutaneous, Erythema marginatum, Sydenham chorea) [1]. * **Mitral Stenosis:** The most common valvular lesion in Rheumatic Heart Disease [1]. The murmur is a low-pitched mid-diastolic rumble with presystolic accentuation (if in sinus rhythm). * **Erythema Marginatum:** It is never found on the face and is worsened by heat (e.g., a warm shower).

Q: A 40-year-old man presents with substernal pain radiating to his left shoulder, occurring at rest. The pain improves with ambulation and responds to sublingual nitroglycerin. Which of the following processes is thought to cause this patient's symptoms?

Coronary artery spasm. ### Explanation The patient’s presentation is characteristic of **Prinzmetal (Variant) Angina**, which is caused by transient **coronary artery spasm** rather than fixed obstructive disease [1]. **Why the correct answer is right:** * **Rest Pain:** Unlike stable angina, Prinzmetal angina occurs at rest and often follows a circadian pattern (frequently in the early morning) [1]. * **Improvement with Ambulation:** This is a classic "paradoxical" feature. While exertion worsens typical atherosclerotic angina, mild exercise or walking can sometimes relieve a spasm by increasing sympathetic tone or metabolic demand that triggers vasodilation. * **Nitroglycerin Response:** Nitrates are potent venodilators and coronary vasodilators, effectively reversing the smooth muscle constriction causing the spasm. **Why the incorrect options are wrong:** * **A. Coronary artery atherosclerosis:** This causes stable angina, where pain is typically triggered by exertion and relieved by rest [2]. * **B & D. Coronary artery embolism/thrombosis:** These processes lead to Acute Coronary Syndrome (ACS) or Myocardial Infarction. Pain in these conditions is usually persistent, severe, and does not improve with ambulation; rather, exertion would worsen the ischemia [3]. **High-Yield Clinical Pearls for NEET-PG:** * **ECG Finding:** Transient **ST-segment elevation** during the episode, which returns to baseline once the pain subsides. * **Risk Factors:** Smoking is a major risk factor; however, traditional factors like hypertension or diabetes are often absent. It is associated with other vasospastic disorders like **Raynaud’s phenomenon** and **migraines**. * **Treatment of Choice:** **Calcium Channel Blockers (CCBs)** are the mainstay of long-term management. * **Contraindication:** **Non-selective Beta-blockers** (e.g., Propranolol) are contraindicated as they can lead to unopposed alpha-adrenergic vasoconstriction, worsening the spasm.

Q: All of the following may occur due to hypokalemia, except?

Prolonged QRS Interval. Hypokalemia (Serum $K^+ < 3.5$ mEq/L) causes characteristic ECG changes primarily by delaying ventricular repolarization and increasing myocardial excitability. **Why "Prolonged QRS Interval" is the correct answer:** In hypokalemia, the QRS complex typically remains **normal in duration**, though it may show a slight increase in amplitude. Significant QRS widening is a hallmark of **Hyperkalemia** (due to slowed intraventricular conduction), not hypokalemia [1]. Therefore, this is the "except" option. **Analysis of other options:** * **Prolonged PR Interval:** Hypokalemia slows conduction through the AV node, which can lead to a prolonged PR interval and, in severe cases, AV blocks [1]. * **Prolonged QT Interval (Pseudo-prolongation):** This is a classic NEET-PG trap. Hypokalemia causes **T-wave flattening** and the appearance of prominent **U-waves**. As the T and U waves fuse, it creates the illusion of a prolonged QT interval, often referred to as a **prolonged QU interval**. * **Ventricular Asystole:** Severe hypokalemia increases the risk of life-threatening arrhythmias, including Ventricular Tachycardia, Torsades de Pointes, and eventually ventricular fibrillation or asystole. **High-Yield Clinical Pearls for NEET-PG:** 1. **Sequence of ECG changes in Hypokalemia:** T-wave flattening/inversion → ST-segment depression → Prominent U-waves (best seen in V2-V4) → Apparent QT prolongation (QU interval). 2. **Digoxin Toxicity:** Hypokalemia potentiates the effects of Digoxin, increasing the risk of arrhythmias even at "normal" therapeutic levels. 3. **Hyperkalemia Mnemonic:** "Tall T, Wide QRS, Flat P" (Tall peaked T-waves are the earliest sign) [1].

Q: Which medication should be administered to a patient with congestive heart failure and a left ventricular ejection fraction (LVEF) less than 40%?

ACE inhibitor + beta-blocker. ### Explanation **Core Concept: Mortality Benefit in HFrEF** In patients with Heart Failure with reduced Ejection Fraction (HFrEF, LVEF <40%), the primary goal of pharmacological therapy is to block the maladaptive neurohormonal activation (Renin-Angiotensin-Aldosterone System and Sympathetic Nervous System) that leads to cardiac remodeling [1]. **ACE inhibitors (ACEIs)** and **Beta-blockers** are the foundational "disease-modifying" agents proven to reduce mortality and hospitalization in these patients [1], [2]. **Analysis of Options:** * **Option A (Correct):** ACEIs reduce afterload and prevent remodeling, while Beta-blockers (specifically Carvedilol, Metoprolol succinate, or Bisoprolol) prevent catecholamine-induced cardiotoxicity [2]. Together, they form the cornerstone of Guideline-Directed Medical Therapy (GDMT). * **Option B:** Furosemide (a loop diuretic) is excellent for symptomatic relief of congestion (edema/dyspnea) but has **no proven mortality benefit** [1]. * **Option C:** Non-dihydropyridine Calcium Channel Blockers (Verapamil/Diltiazem) are generally **avoided** in HFrEF due to their negative inotropic effects, which can worsen heart failure [3]. * **Option D:** Combining an ACEI and an ARB is generally avoided due to the increased risk of adverse effects like hyperkalemia and renal dysfunction without significant added survival benefit. **NEET-PG High-Yield Pearls:** 1. **The "Big Four" of HFrEF:** Current guidelines recommend a quadruple therapy to reduce mortality: **ARNI** (Sacubitril/Valsartan) or ACEI/ARB + **Beta-blocker** + **MRA** (Spironolactone) + **SGLT2 Inhibitor** (Dapagliflozin). 2. **Beta-blocker Initiation:** Never start a beta-blocker during an *acute* decompensation; the patient must be stable and "dry" (euvolemic). 3. **Contraindication:** ACEIs are strictly contraindicated in pregnancy and bilateral renal artery stenosis.

Question 1

Cardiovascular causes of digital clubbing include all of the following EXCEPT:

Accepted Answer

Aortic Dissection

Answer

Infective Endocarditis

Answer

Arteriovenous Fistulas

Answer

Tricuspid Atresia

Question 2

Nocturnal anginal pain and severe diaphoresis are seen in which of the following conditions?

Accepted Answer

Chronic severe aortic regurgitation

Answer

Acute severe mitral regurgitation

Answer

Chronic severe mitral stenosis with mitral regurgitation

Answer

Acute severe aortic regurgitation

Question 3

What is the most common complication of infective endocarditis?

Accepted Answer

Embolisation

Answer

Congestive Cardiac Failure (CCF)

Answer

Regurgitation

Answer

Sudden death

Question 4

Loud S1 in Mitral Stenosis is seen in which of the following conditions?

Accepted Answer

Prolonged flow through the mitral valve

Answer

First-degree heart block

Answer

Calcification of the mitral valve

Answer

Immobilization of the mitral valve

Question 5

A patient presents with shock due to pump failure. What is the ideal management?

Accepted Answer

Dopamine

Answer

Intra-aortic balloon pumping

Answer

Intracardiac adrenaline

Answer

Rapid digitalization

Question 6

A 35-year-old woman presents for a regular health check-up. She denies any current medical problems except for a childhood hospitalization for a throat infection. Examination reveals normal vital signs. On physical examination, normal S1 and S2 with a late rumbling diastolic murmur heard at the apex, enhanced by expiration. Which of the following skin lesions may have accompanied the illness?

Accepted Answer

Erythema marginatum

Answer

Erythema migrans

Answer

Erythema multiforme

Answer

Janeway lesion

Question 7

A 40-year-old man presents with substernal pain radiating to his left shoulder, occurring at rest. The pain improves with ambulation and responds to sublingual nitroglycerin. Which of the following processes is thought to cause this patient's symptoms?

Accepted Answer

Coronary artery spasm

Answer

Coronary artery atherosclerosis

Answer

Coronary artery embolism

Answer

Coronary artery thrombosis

Question 8

All of the following statements regarding the ECG changes in acute pericarditis are true, except?

Accepted Answer

T wave inversions develop before ST elevation returns to baseline

Answer

Sinus tachycardia is a common finding

Answer

PR segment depression is present in the majority of patients

Answer

Global ST segment elevation is seen in early pericarditis

Question 9

All of the following may occur due to hypokalemia, except?

Accepted Answer

Prolonged QRS Interval

Answer

Prolonged PR Interval

Answer

Prolonged QT Interval

Answer

Ventricular asystole

Question 10

Which medication should be administered to a patient with congestive heart failure and a left ventricular ejection fraction (LVEF) less than 40%?

Accepted Answer

ACE inhibitor + beta-blocker

Answer

ACE inhibitor + furosemide

Answer

ACE inhibitor + calcium channel blocker

Answer

ACE inhibitor + angiotensin II receptor blocker

Cardiology — MCQs

Cardiology — MCQs

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