Cardiology Practice Questions

Q: Loud S1 is caused by which of the following conditions?

Short PR interval. The intensity of the first heart sound (S1) is primarily determined by the position of the Atrioventricular (AV) valves (Mitral and Tricuspid) at the onset of ventricular systole. **Why Short PR Interval is Correct:** In a **Short PR interval** (e.g., WPW syndrome or tachycardia), the time between atrial and ventricular contraction is brief. The mitral valve leaflets are still wide open and deep in the ventricular cavity when ventricular systole begins. The leaflets must travel a long distance to close, slamming shut with high velocity and force, which produces a **Loud S1**. **Analysis of Incorrect Options:** * **Calcified Mitral Valve:** For a valve to produce a loud sound, it must be mobile. Severe calcification (as seen in long-standing Mitral Stenosis) stiffens the leaflets, reducing their mobility and resulting in a **Soft S1** [1]. * **Mitral Regurgitation:** In chronic MR, the leaflets often fail to appose properly or are structurally damaged, leading to a **Soft S1**. * **Bradycardia:** A slow heart rate allows for a long diastole. The leaflets have ample time to float back toward a semi-closed position before systole begins, resulting in a **Soft S1**. **High-Yield Clinical Pearls for NEET-PG:** * **Loud S1 Causes:** Mitral Stenosis (mobile valve), Tachycardia, Short PR interval, and Hyperdynamic states (Anemia, Pregnancy, Exercise) [2]. * **Soft S1 Causes:** Mitral Regurgitation, Long PR interval (1st-degree AV block), Calcified Mitral Valve, and Obesity/COPD (due to sound attenuation) [1]. * **Variable S1:** Classically seen in **Atrial Fibrillation** and **Complete Heart Block** (due to varying PR intervals).

Q: Echocardiography can detect pericardial effusion as little as:

15 ml. ### Explanation **Correct Option: A (15 ml)** Echocardiography (Transthoracic Echocardiogram - TTE) is the gold standard and the most sensitive non-invasive tool for detecting pericardial effusion [1]. It can identify as little as **15–50 ml** of fluid in the pericardial sac. On an echo, this appears as an "echo-free space" between the visceral and parietal pericardium. Small effusions are typically first visualized posteriorly in the supine position due to gravity. **Analysis of Incorrect Options:** * **Option B (100 ml):** While 100 ml is easily detectable by echo, it is not the *minimum* threshold. Pericardial effusions may be small, sometimes even less than 100 ml [1]. At this volume, the effusion usually begins to distribute circumferentially around the heart. * **Option C & D (150 ml and 200 ml):** These volumes are significant and often represent the threshold for detection on a **Chest X-ray**. A Chest X-ray typically requires at least **200 ml** of fluid to show a "Water-bottle" or "Money-bag" heart (cardiomegaly with clear lung fields) [1]. **High-Yield Clinical Pearls for NEET-PG:** * **Grading on Echo:** * *Small:* 20 mm. * **Electrical Alternans:** A pathognomonic ECG finding in large effusions caused by the "swinging heart" motion [1]. * **Beck’s Triad (Cardiac Tamponade):** Hypotension, Jugular Venous Distension (JVD), and muffled heart sounds. * **Ewart’s Sign:** Dullness to percussion and bronchial breath sounds below the left scapula due to compression of the left lung base by a large pericardial sac.

Q: A 60-year-old female presents with epigastric pain, nausea, and vomiting, a heart rate of 50, and pronounced first-degree AV block on ER cardiac monitor. Blood pressure is 130/80. The coronary artery most likely to be involved in this process is the

Right coronary. The clinical presentation of epigastric pain, nausea, and vomiting in an elderly patient should always raise suspicion of an **Inferior Wall Myocardial Infarction (IWMI)**. In this case, the presence of **bradycardia (HR 50)** and **first-degree AV block** strongly points toward the **Right Coronary Artery (RCA)** as the culprit vessel. [1] **Why Right Coronary Artery (RCA) is correct:** 1. **Anatomy:** The RCA supplies the inferior wall of the left ventricle in 85% of individuals (Right Dominance). 2. **Conduction System:** The RCA provides the blood supply to the **SA node** (in 60% of people) and the **AV node** (in 90% of people). Ischemia to these nodes leads to sinus bradycardia and various degrees of heart block. 3. **Vagal Stimulation:** Inferior MIs often trigger the Bezold-Jarisch reflex, increasing vagal tone, which results in the classic triad of bradycardia, hypotension, and nausea/vomiting. [1] **Why other options are incorrect:** * **Left Anterior Descending (LAD):** This artery supplies the anterior wall and the bundle branches. LAD occlusion typically causes Anterior MI, which presents with tachycardia (due to sympathetic surge) or high-grade blocks (like RBBB or Mobitz II) rather than simple nodal bradycardia. * **Left Main:** Occlusion usually results in massive anterolateral infarction and cardiogenic shock, often being fatal ("widow-maker"). **High-Yield Clinical Pearls for NEET-PG:** * **Right Ventricular MI:** Frequently accompanies RCA-related Inferior MI. Look for the triad of hypotension, clear lung fields, and elevated JVP. * **Treatment Tip:** In RCA/Inferior MI with bradycardia, **Atropine** is the initial drug of choice. Avoid Nitrates if RV infarction is suspected, as they can cause profound hypotension. [2] * **ECG Leads:** Inferior MI is seen in leads **II, III, and aVF**. [3]

Q: A 47-year-old man presents with edema, ascites, and hepatosplenomegaly. Examination of his neck veins reveals elevated venous pressure with a deep y descent. Chest x-ray shows a normal heart size. Which of the following etiologies is not a possible explanation for this syndrome?

Rheumatic fever. ### Explanation The clinical presentation of edema, ascites, hepatosplenomegaly, elevated JVP with a **prominent (deep) 'y' descent**, and a **normal heart size** on chest X-ray is classic for **Constrictive Pericarditis (CP)** [1]. **1. Why Rheumatic Fever is the Correct Answer:** Rheumatic fever primarily affects the endocardium (valves) and myocardium. While it can cause pericarditis during the acute phase (pancarditis), it **virtually never** leads to chronic constrictive pericarditis. Instead, rheumatic heart disease typically results in valvular dysfunction and cardiomegaly, which contradicts the "normal heart size" finding in this vignette. **2. Analysis of Incorrect Options (Causes of CP):** * **Tuberculosis (Option B):** Globally, TB remains a leading cause of constrictive pericarditis, especially in developing countries like India [1]. It often presents with pericardial thickening and calcification. * **Idiopathic/Unknown Cause (Option C):** In developed nations, the most common cause of CP is idiopathic (likely post-viral), where the pericardium becomes fibrotic without a clear preceding event [1]. * **Previous Acute Pericarditis (Option D):** Any cause of acute pericarditis (viral, bacterial, or uremic) can progress to a chronic constrictive state over months or years. **3. NEET-PG High-Yield Pearls:** * **Friedreich’s Sign:** The deep, rapid 'y' descent in JVP seen in CP (representing rapid ventricular filling). * **Kussmaul’s Sign:** Paradoxical rise in JVP during inspiration (common in CP, rare in cardiac tamponade). * **Pericardial Knock:** A high-pitched sound heard in early diastole due to the sudden cessation of ventricular filling by the rigid pericardium. * **Imaging:** CT/MRI is the gold standard to visualize pericardial thickening (>3mm); Chest X-ray may show a "eggshell" calcification of the pericardium.

Q: All of the following are seen in Coarctation of the Aorta, except?

Boot shaped heart. **Explanation:** **Coarctation of the Aorta (CoA)** is a localized narrowing of the aorta, typically occurring near the insertion of the ductus arteriosus (post-ductal). **Why "Boot-shaped heart" is the correct answer:** The **"Boot-shaped heart" (Coeur en sabot)** is the classic radiological finding in **Tetralogy of Fallot (TOF)**, not Coarctation [1]. It is caused by right ventricular hypertrophy (RVH) elevating the cardiac apex, combined with a concave pulmonary segment due to pulmonary stenosis. In contrast, the classic radiological sign for Coarctation is the **"3" sign** on X-ray (pre- and post-stenotic dilatation) and **rib notching** (due to collateral flow through intercostal arteries). **Analysis of other options:** * **A. Diminution of femoral pulsations:** This is a hallmark clinical sign. The narrowing causes high blood pressure in the upper extremities and low pressure/delayed pulses in the lower extremities (**radio-femoral delay**) [2]. * **B. High incidence of associated Bicuspid aortic valve:** This is the most common associated cardiac anomaly, seen in approximately **50-80%** of patients with CoA. * **C. Left ventricular Hypertrophy (LVH):** Because the heart must pump against the high resistance of the narrowed aorta (increased afterload), the left ventricle undergoes compensatory hypertrophy. **High-Yield Clinical Pearls for NEET-PG:** * **Turner Syndrome:** Strongly associated with CoA (approx. 10-15% of cases) [2]. * **Rib Notching:** Usually involves the 3rd to 8th ribs; it never involves the 1st and 2nd ribs because their intercostal arteries do not bypass the obstruction. * **Physical Exam:** Look for a systolic murmur heard best over the left interscapular area. * **Complications:** Berry aneurysms (Circle of Willis), infective endocarditis, and premature coronary artery disease.

Q: Which of the following drugs should not be used empirically in an elderly patient with severe hypertension?

Prazosin. **Explanation:** The correct answer is **Prazosin**. **Why Prazosin is the correct choice:** Prazosin is a selective **alpha-1 blocker**. Its use as an empirical, first-line monotherapy for hypertension is discouraged, especially in the elderly, due to the **"First-Dose Phenomenon."** This refers to sudden, severe orthostatic hypotension and syncope occurring shortly after the initial dose. In elderly patients, who often have impaired baroreceptor reflexes and are at a higher risk of falls and fractures, this side effect can be catastrophic. Furthermore, the ALLHAT trial demonstrated that alpha-blockers are less effective than other classes in preventing heart failure. **Why the other options are incorrect:** * **Enalapril (ACE Inhibitor):** These are standard first-line agents, particularly beneficial in patients with comorbid diabetes or chronic kidney disease (CKD). * **Amlodipine (Calcium Channel Blocker):** CCBs are highly effective and recommended as first-line therapy for elderly patients and those of African descent with isolated systolic hypertension. * **Chlorthalidone (Thiazide-like Diuretic):** Thiazides/Thiazide-like diuretics are preferred first-line agents for elderly patients. Chlorthalidone is often favored over hydrochlorothiazide due to its longer half-life and superior evidence in reducing cardiovascular events. **High-Yield Clinical Pearls for NEET-PG:** * **Beers Criteria:** Prazosin is listed in the Beers Criteria as a potentially inappropriate medication for the elderly due to the high risk of orthostatic hypotension. * **Indication for Prazosin:** It is primarily used as an add-on therapy for resistant hypertension or for symptomatic relief in **Benign Prostatic Hyperplasia (BPH)**. * **Management:** To minimize the first-dose effect, the drug should be started at a low dose and administered at **bedtime**.

Q: Restrictive and constrictive cardiomyopathy occurs together in which of the following conditions?

Amyloidosis. **Explanation:** The correct answer is **Amyloidosis**. **1. Why Amyloidosis is correct:** Amyloidosis is a systemic disease characterized by the extracellular deposition of insoluble amyloid fibrils. In the heart, these deposits infiltrate the myocardium, leading to **Restrictive Cardiomyopathy (RCM)** due to increased ventricular stiffness and impaired diastolic filling. However, amyloid fibrils can also deposit in the **pericardium**, leading to thickening and fibrosis. This dual involvement—myocardial infiltration and pericardial thickening—results in a unique clinical scenario where features of both **restrictive** (myocardial) and **constrictive** (pericardial) physiology coexist. **2. Analysis of Incorrect Options:** * **Radiation Therapy (Option A):** While radiation can cause both restrictive cardiomyopathy (via myocardial fibrosis) and constrictive pericarditis, it is less commonly cited as a "classic" combined entity in standard textbooks compared to the infiltrative nature of amyloidosis. * **Adriamycin (Doxorubicin) Toxicity (Option B):** This typically causes **Dilated Cardiomyopathy (DCM)** due to direct toxic effects on myocytes leading to systolic heart failure, not restrictive or constrictive disease. * **Post-cardiotomy Syndrome (Option C):** This is an inflammatory pericarditis that occurs after cardiac surgery. It primarily leads to **Constrictive Pericarditis** but does not typically involve the myocardium to cause restrictive cardiomyopathy. **3. NEET-PG High-Yield Pearls:** * **Amyloidosis** is the most common cause of Restrictive Cardiomyopathy. * **ECG Finding:** Low voltage complexes in the presence of thickened ventricular walls on Echo (a classic "mismatch"). * **Echo Finding:** "Speckled" or "granular" appearance of the myocardium. * **Gold Standard Diagnosis:** Endomyocardial biopsy showing **Apple-green birefringence** under polarized light with Congo Red stain.

Q: A 50-year-old man with aortic stenosis stopped exercise after 11 minutes according to the Bruce protocol due to fatigue. He had a peak systolic gradient of 60 mmHg across the aortic valve at rest. What is the best management for this patient?

Aortic valve replacement. **Explanation** The patient has **Severe Aortic Stenosis (AS)**, defined by a peak systolic gradient >64 mmHg or a mean gradient >40 mmHg. In this case, a peak gradient of 60 mmHg at rest, combined with the inability to complete a standard exercise protocol due to fatigue, indicates symptomatic disease. [1] **1. Why Aortic Valve Replacement (AVR) is correct:** The definitive treatment for symptomatic severe AS is surgical or transcatheter AVR. While the patient did not report classic angina or syncope, **exercise intolerance (fatigue)** during a stress test is considered a "symptom equivalent." [2] Once symptoms develop in severe AS, the mortality rate increases drastically (2-year survival is only 50% without intervention). According to AHA/ACC guidelines, AVR is indicated (Class I) for symptomatic patients with severe AS. **2. Why other options are incorrect:** * **Medical management:** There is no effective medical therapy to reverse the mechanical obstruction of AS. It is only used for symptom palliation in non-surgical candidates. * **Aortic valve balloon dilatation (Valvuloplasty):** In adults, this is only a "bridge" to AVR or a palliative measure, as restenosis occurs within 6–12 months. It is not a definitive management. [2] * **Coronary angiography:** While often performed *before* surgery to check for CAD, it is a diagnostic step, not the "management" for the valvular lesion itself. **Clinical Pearls for NEET-PG:** * **Classic Triad of AS:** Dyspnea (Heart Failure), Angina, and Syncope (**SAD**). * **Severe AS Criteria:** Valve area 40 mmHg, or Jet velocity >4.0 m/s. * **Physical Exam:** Pulsus parvus et tardus (slow-rising pulse) and a mid-systolic ejection murmur radiating to the carotids. [1] * **Indication for Surgery in Asymptomatic patients:** LVEF <50% or a positive exercise stress test (development of symptoms or drop in BP). [2]

Question 1

Loud S1 is caused by which of the following conditions?

Accepted Answer

Short PR interval

Answer

Calcified mitral valve

Answer

Mitral regurgitation

Answer

Bradycardia

Question 2

Echocardiography can detect pericardial effusion as little as:

Accepted Answer

15 ml

Answer

100 ml

Answer

150 ml

Answer

200 ml

Question 3

A 52-year-old woman presents with exertional fatigue and ascites. She is noted to have a rapid, irregular pulse rate. The chest X-ray reveals a small heart with calcification seen on the lateral view. The 12-lead ECG demonstrates low QRS voltage. What is the clinical diagnosis?

Accepted Answer

Constrictive pericarditis

Answer

Rheumatic pancarditis

Answer

Restrictive cardiomyopathy

Answer

Acute cor-pulmonale

Question 4

A 60-year-old female presents with epigastric pain, nausea, and vomiting, a heart rate of 50, and pronounced first-degree AV block on ER cardiac monitor. Blood pressure is 130/80. The coronary artery most likely to be involved in this process is the

Accepted Answer

Right coronary

Answer

Left main

Answer

Left anterior descending

Answer

Left anterior descending

Question 5

A 47-year-old man presents with edema, ascites, and hepatosplenomegaly. Examination of his neck veins reveals elevated venous pressure with a deep y descent. Chest x-ray shows a normal heart size. Which of the following etiologies is not a possible explanation for this syndrome?

Accepted Answer

Rheumatic fever

Answer

Tuberculosis

Answer

Constrictive pericarditis of unknown cause

Answer

Previous acute pericarditis

Question 6

A 50-year-old construction worker has a persistently elevated BP of 160/100 mmHg despite adding a thiazide diuretic to his antihypertensive regimen. Physical examination is normal, electrolytes are normal, and he denies taking any over-the-counter medications. What is the next most helpful diagnostic step for this patient?

Accepted Answer

Check pill count

Answer

Perform renal Doppler

Answer

MRI of the aorta

Answer

CT scan of the adrenal glands

Question 7

All of the following are seen in Coarctation of the Aorta, except?

Accepted Answer

Boot shaped heart

Answer

Diminution of femoral pulsations

Answer

High incidence of associated Bicuspid aortic valve

Answer

Left ventricular Hypertrophy

Question 8

Which of the following drugs should not be used empirically in an elderly patient with severe hypertension?

Accepted Answer

Prazosin

Answer

Enalapril

Answer

Amlodipine

Answer

Chlorthalidone

Question 9

Restrictive and constrictive cardiomyopathy occurs together in which of the following conditions?

Accepted Answer

Amyloidosis

Answer

Radiation therapy

Answer

Adriamycin toxicity

Answer

Post cardiotomy syndrome

Question 10

A 50-year-old man with aortic stenosis stopped exercise after 11 minutes according to the Bruce protocol due to fatigue. He had a peak systolic gradient of 60 mmHg across the aortic valve at rest. What is the best management for this patient?

Accepted Answer

Aortic valve replacement

Answer

Medical management

Answer

Aortic valve balloon dilatation

Answer

Coronary angiography

Cardiology — MCQs

Cardiology — MCQs

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