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: What is the most common valvular abnormality in carcinoid heart disease?

Tricuspid insufficiency. **Explanation:** Carcinoid heart disease occurs in patients with metastatic carcinoid tumors (usually from the midgut) that secrete high levels of vasoactive substances like **serotonin** into the systemic circulation. **Why Tricuspid Insufficiency is Correct:** The hallmark of carcinoid heart disease is the deposition of **fibrous, plaque-like endocardial thickening** on the right-sided valves. Serotonin causes fibroblast proliferation, leading to the shortening and thickening of the tricuspid valve leaflets and chordae tendineae. This prevents the valve from closing properly, making **Tricuspid Insufficiency (Regurgitation)** the most common and clinically significant valvular abnormality [1]. **Analysis of Incorrect Options:** * **Tricuspid Stenosis:** While the fibrous plaques can cause some degree of stenosis, it is far less common than regurgitation [2]. * **Pulmonary Stenosis:** The pulmonary valve is also affected (usually causing stenosis), but the tricuspid valve is involved more frequently and severely. * **Constrictive Pericarditis:** This involves the pericardium, whereas carcinoid heart disease primarily targets the endocardium and valves. **High-Yield Clinical Pearls for NEET-PG:** 1. **Right vs. Left:** Carcinoid heart disease predominantly affects the **right side** of the heart because serotonin is inactivated by the lungs (monoamine oxidase). Left-sided involvement only occurs if there is a right-to-left shunt (e.g., PFO) or a primary bronchial carcinoid. 2. **Biochemical Marker:** 24-hour urinary **5-HIAA** (5-hydroxyindoleacetic acid) is the diagnostic marker of choice. 3. **Echocardiography:** Shows "frozen" or fixed valve leaflets in a semi-open position [1].

Question 1

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 2

What is the most common complication of infective endocarditis?

Accepted Answer

Embolisation

Answer

Congestive Cardiac Failure (CCF)

Answer

Regurgitation

Answer

Sudden death

Question 3

Eisenmenger's syndrome is characterized by which of the following except?

Accepted Answer

Anemia

Answer

Cyanosis

Answer

Pulmonary hypertension

Answer

Narrow split S2

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

Pulsus paradoxus is seen in which of the following conditions?

Accepted Answer

All of the above

Answer

Pericardial tamponade

Answer

Pulmonary embolism

Answer

Hemorrhagic shock

Question 9

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 10

What is the most common valvular abnormality in carcinoid heart disease?

Accepted Answer

Tricuspid insufficiency

Answer

Tricuspid stenosis

Answer

Pulmonary stenosis

Answer

Constrictive pericarditis

Cardiology — MCQs

Cardiology — MCQs

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