Cardiology — MCQs

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?

Q157Medium

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?

Q158Easy

Pulsus paradoxus is seen in which of the following conditions?

Q159Medium

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

Q160Easy

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

Cardiology Indian Medical PG Practice Questions and MCQs

Question 151: Nocturnal anginal pain and severe diaphoresis are seen in which of the following conditions?

A. Acute severe mitral regurgitation
B. Chronic severe mitral stenosis with mitral regurgitation
C. Acute severe aortic regurgitation
D. Chronic severe aortic regurgitation (Correct Answer)

Explanation: **Explanation:** **Chronic Severe Aortic Regurgitation (AR)** is the correct answer due to its unique pathophysiology involving extreme volume overload and compensatory mechanisms. 1. **Why it is correct:** In chronic severe AR, the left ventricle (LV) undergoes massive eccentric hypertrophy to accommodate the regurgitant volume. This leads to a significantly increased myocardial oxygen demand [2]. During sleep, the heart rate naturally slows down (bradycardia). A slower heart rate increases the duration of diastole, which paradoxically allows more time for blood to regurgitate from the aorta into the LV [1]. This increases LV end-diastolic pressure (LVEDP) and decreases coronary perfusion pressure (which occurs during diastole). The resulting subendocardial ischemia manifests as **nocturnal angina**. The **severe diaphoresis** (sweating) is a result of the massive sympathetic surge triggered by the high stroke volume and the body's attempt to manage the wide pulse pressure. 2. **Why other options are incorrect:** * **Acute Severe MR/AR:** These are surgical emergencies characterized by sudden pulmonary edema and cardiogenic shock [1]. The LV does not have time to dilate or hypertrophy, so the specific "nocturnal angina" pattern seen in chronic compensation is not the hallmark. * **Chronic Mitral Stenosis/Regurgitation:** While these cause dyspnea (PND), they do not typically present with the classic combination of nocturnal anginal pain and profuse diaphoresis characteristic of the "Corrigan’s pulse" and wide pulse pressure states of AR. **Clinical Pearls for NEET-PG:** * **Hill’s Sign:** The most sensitive clinical sign for AR (popliteal systolic BP >20 mmHg higher than brachial). * **Duroziez’s Sign:** Systolic and diastolic murmurs heard over the femoral artery. * **Austin Flint Murmur:** A mid-diastolic murmur heard at the apex in severe AR, caused by the regurgitant jet displacing the mitral valve leaflet [1]. * **Management:** Vasodilators (ACE inhibitors/Nifedipine) reduce afterload; Valve replacement is the definitive treatment when symptomatic or when EF <50%.

Question 152: What is the most common complication of infective endocarditis?

A. Congestive Cardiac Failure (CCF)
B. Embolisation (Correct Answer)
C. Regurgitation
D. Sudden death

Explanation: **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.

Question 153: Eisenmenger's syndrome is characterized by which of the following except?

A. Cyanosis
B. Anemia (Correct Answer)
C. Pulmonary hypertension
D. Narrow split S2

Explanation: ### Explanation **Eisenmenger’s syndrome** represents the end-stage of a long-standing left-to-right shunt (such as VSD, ASD, or PDA). Chronic high blood flow to the lungs leads to irreversible pulmonary vascular remodeling, resulting in severe pulmonary hypertension [1]. When pulmonary pressure exceeds systemic pressure, the shunt reverses to **right-to-left**, causing deoxygenated blood to enter the systemic circulation. #### Why Anemia is the Correct Answer (The Exception) In Eisenmenger’s syndrome, chronic systemic hypoxemia stimulates the kidneys to produce erythropoietin. This leads to **secondary polycythemia** (increased red blood cell production) to compensate for low oxygen levels. Therefore, patients typically present with high hemoglobin levels and erythrocytosis, **not anemia**. #### Analysis of Incorrect Options * **Cyanosis:** This is a hallmark feature. The reversal of the shunt (right-to-left) allows deoxygenated blood to bypass the lungs and enter the systemic circulation, leading to central cyanosis and digital clubbing. * **Pulmonary Hypertension:** This is the underlying pathophysiology. Increased pulmonary vascular resistance is mandatory for the shunt reversal that defines the syndrome [1]. * **Narrow split S2:** In severe pulmonary hypertension, the pulmonary component of the second heart sound (P2) becomes significantly loud and occurs earlier due to high back-pressure, often resulting in a **narrowly split S2** or a single, palpable S2. #### NEET-PG High-Yield Pearls * **Differential Cyanosis:** Specifically seen in Eisenmenger’s secondary to **PDA** (cyanosis and clubbing in the lower limbs, but not the upper limbs). * **Management:** Surgical closure of the defect is **contraindicated** once Eisenmenger’s syndrome has developed; heart-lung transplantation is the definitive treatment. * **Hyperviscosity:** Patients with polycythemia are at risk for strokes and thrombosis; however, routine phlebotomy is avoided unless the hematocrit is >65% with symptoms.

Question 154: Loud S1 in Mitral Stenosis is seen in which of the following conditions?

A. Prolonged flow through the mitral valve (Correct Answer)
B. First-degree heart block
C. Calcification of the mitral valve
D. Immobilization of the mitral valve

Explanation: ### 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).

Question 155: A patient presents with shock due to pump failure. What is the ideal management?

A. Intra-aortic balloon pumping
B. Intracardiac adrenaline
C. Rapid digitalization
D. Dopamine (Correct Answer)

Explanation: **Explanation:** **1. Why Dopamine is the Correct Answer:** Shock due to pump failure (Cardiogenic Shock) is characterized by a low cardiac output state leading to systemic hypotension and end-organ hypoperfusion. **Dopamine** is historically considered the initial drug of choice in this setting because of its dose-dependent effects [2]. At moderate doses (5–10 µg/kg/min), it acts on **β1-adrenergic receptors** to increase myocardial contractility (inotropy) and heart rate (chronotropy). At higher doses (>10 µg/kg/min), it stimulates **α-receptors**, causing peripheral vasoconstriction to maintain mean arterial pressure (MAP) [1]. This dual action helps stabilize hemodynamics rapidly. **2. Why the Other Options are Incorrect:** * **Intra-aortic balloon pumping (IABP):** While IABP is a vital mechanical circulatory support device for cardiogenic shock, it is generally considered an adjunct or "bridge" therapy when pharmacological management fails or for specific complications (like mitral regurgitation) [2]. It is not the first-line "medical" management. * **Intracardiac adrenaline:** This is an obsolete practice. Adrenaline is used in ACLS protocols (IV/IO), but direct intracardiac injection carries high risks of coronary artery laceration and pneumothorax. * **Rapid digitalization:** Digoxin has a slow onset of action and narrow therapeutic index. It is ineffective for the acute, emergency stabilization of cardiogenic shock [3]. **3. NEET-PG High-Yield Pearls:** * **Current Trend:** While Dopamine is the traditional answer, recent guidelines (and the SOAP II trial) often favor **Norepinephrine** as the first-line vasopressor in cardiogenic shock due to a lower risk of arrhythmias compared to Dopamine [2]. * **Dobutamine** is the preferred pure inotrope if the blood pressure is relatively stable (SBP >90 mmHg). * **Definition:** Cardiogenic shock is defined by SBP <90 mmHg for >30 mins, a Cardiac Index <2.2 L/min/m², and increased Pulmonary Capillary Wedge Pressure (PCWP >15 mmHg) [4].

Question 156: 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?

A. Erythema migrans
B. Erythema marginatum (Correct Answer)
C. Erythema multiforme
D. Janeway lesion

Explanation: 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).

Question 157: 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?

A. Coronary artery atherosclerosis
B. Coronary artery embolism
C. Coronary artery spasm (Correct Answer)
D. Coronary artery thrombosis

Explanation: ### 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.

Question 158: Pulsus paradoxus is seen in which of the following conditions?

A. Pericardial tamponade
B. Pulmonary embolism
C. Hemorrhagic shock
D. All of the above (Correct Answer)

Explanation: **Explanation:** **Pulsus paradoxus** is defined as an exaggerated fall in systolic blood pressure (>10 mmHg) during inspiration. Under normal physiological conditions, inspiration increases venous return to the right heart, causing the interventricular septum to bulge slightly into the left ventricle (LV), minimally reducing LV stroke volume. **Why "All of the Above" is Correct:** The underlying mechanism involves **ventricular interdependence** and exaggerated intrathoracic pressure swings: 1. **Pericardial Tamponade (Option A):** This is the classic cause. The heart is encased in a non-compliant fluid-filled sac [1]. During inspiration, the increased right ventricular (RV) filling can only occur by significantly displacing the septum toward the LV, drastically reducing LV filling and systolic pressure. 2. **Pulmonary Embolism (Option B):** Massive PE causes acute RV strain and dilation. This increases RV end-diastolic pressure, which, combined with negative intrathoracic pressure during inspiration, shifts the septum toward the LV, compromising output. 3. **Hemorrhagic Shock (Option C):** In severe hypovolemia, the LV is "underfilled." Even a normal physiological shift of the septum during inspiration can cause a disproportionate percentage drop in the already low stroke volume, manifesting as pulsus paradoxus. **High-Yield Clinical Pearls for NEET-PG:** * **Kussmaul’s Sign vs. Pulsus Paradoxus:** Kussmaul’s sign (elevation of JVP on inspiration) is classic for **Constrictive Pericarditis**, whereas Pulsus Paradoxus is classic for **Cardiac Tamponade** [1]. * **Non-Cardiac Causes:** Severe Asthma and COPD are frequent examiners' favorites for pulsus paradoxus due to extreme swings in pleural pressure. * **Reverse Pulsus Paradoxus:** Seen in Hypertrophic Obstructive Cardiomyopathy (HOCM) and patients on positive pressure ventilation. * **Absence in Tamponade:** Pulsus paradoxus may be absent in tamponade if there is co-existing ASD, Aortic Regurgitation, or severe LV dysfunction.

Question 159: All of the following statements regarding the ECG changes in acute pericarditis are true, except?

A. Sinus tachycardia is a common finding
B. PR segment depression is present in the majority of patients
C. Global ST segment elevation is seen in early pericarditis
D. T wave inversions develop before ST elevation returns to baseline (Correct Answer)

Explanation: The diagnosis of acute pericarditis relies heavily on characteristic ECG evolution, which typically occurs in four distinct stages. Understanding the sequence of these changes is crucial for differentiating pericarditis from an acute myocardial infarction (AMI). [1] **Why Option D is the Correct Answer (The False Statement):** In acute pericarditis, **T-wave inversions occur only after the ST segments have returned to the baseline.** [1] This is a key diagnostic differentiator from AMI, where T-wave inversion often occurs while the ST segment is still elevated. [2] If T-waves become inverted while ST segments are still up, one should suspect an alternative diagnosis like myocardial ischemia or evolving infarction. **Analysis of Incorrect Options:** * **Option A:** Sinus tachycardia is the most common rhythm finding in acute pericarditis, usually occurring as a non-specific response to pain and inflammation. * **Option B:** PR segment depression (specifically in lead II and other limb/precordial leads) with PR elevation in lead aVR is a highly specific early sign of atrial inflammation and is seen in the majority of patients. [1] * **Option C:** Stage 1 of pericarditis is characterized by diffuse (global), concave-upwards ST-segment elevation. [1] Unlike AMI, this elevation does not follow a specific coronary artery territory. **High-Yield Clinical Pearls for NEET-PG:** * **Stage 1:** Diffuse ST elevation + PR depression (Most specific sign). [1] * **Stage 2:** Normalization of ST and PR segments. * **Stage 3:** Diffuse T-wave inversions. [1] * **Stage 4:** ECG returns to normal (or persistent T-wave inversions). * **Spodick’s Sign:** Downsloping of the TP segment, seen in about 80% of patients with acute pericarditis. * **Reciprocal changes:** In pericarditis, ST depression is seen **only** in leads aVR and V1; any other reciprocal ST depression suggests AMI.

Question 160: What is the most common valvular abnormality in carcinoid heart disease?

A. Tricuspid insufficiency (Correct Answer)
B. Tricuspid stenosis
C. Pulmonary stenosis
D. Constrictive pericarditis

Explanation: **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].

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Cardiology — MCQs

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