Cardiology — MCQs

Cardiology Indian Medical PG Practice Questions and MCQs

Question 131: Which of the following is not a feature of a pansystolic murmur?

A. Atrial septal defect
B. Ventricular septal defect
C. Mitral regurgitation
D. Mitral stenosis (Correct Answer)

Explanation: **Explanation:** A **pansystolic (holosystolic) murmur** begins at the first heart sound ($S_1$) and continues throughout systole up to the second heart sound ($S_2$). It occurs when there is a pressure gradient between two chambers that persists throughout the entire systolic phase. **Why Mitral Stenosis is the Correct Answer:** Mitral Stenosis (MS) is a **diastolic murmur**, not a systolic one [1]. It is characterized by a mid-diastolic rumbling murmur with presystolic accentuation, preceded by an opening snap [3]. Since the mitral valve is closed during systole, its narrowing cannot produce a pansystolic murmur. **Analysis of Incorrect Options:** * **Ventricular Septal Defect (VSD):** This is a classic cause of a pansystolic murmur [4]. Blood flows from the high-pressure left ventricle to the low-pressure right ventricle throughout the entire duration of systole. * **Mitral Regurgitation (MR):** In MR, the incompetent valve allows blood to leak back into the low-pressure left atrium as soon as ventricular contraction begins, lasting until the aortic valve closes [2]. * **Tricuspid Regurgitation (TR):** (Often grouped with MR/VSD) This also produces a pansystolic murmur, typically heard best at the left lower sternal border, which increases with inspiration (Carvallo’s sign). * **Atrial Septal Defect (ASD):** While the question lists ASD, it is important to note that a simple ASD usually produces a **midsystolic flow murmur** [2] (due to increased flow across the pulmonary valve) and a fixed split $S_2$. However, in the context of this MCQ, MS is the most definitively "incorrect" feature as it is purely diastolic. **NEET-PG High-Yield Pearls:** 1. **Pansystolic Murmurs (The Big 3):** Mitral Regurgitation, Tricuspid Regurgitation, and Ventricular Septal Defect. 2. **Dynamic Auscultation:** MR increases with handgrip (increased afterload); VSD also increases with handgrip; TR increases with inspiration. 3. **Mitral Stenosis Triad:** Loud $S_1$, Opening Snap, and Mid-diastolic rumble [3].

Question 132: A patient of myocardial infarction dies within the first few hours of infarction due to which of the following complications?

A. Ventricular fibrillation
B. Cardiac failure (Correct Answer)
C. Atrial fibrillation
D. Cardiac tamponade

Explanation: The correct answer is **Cardiac Failure**. **1. Why Cardiac Failure is correct:** In the immediate aftermath of an acute myocardial infarction (MI), the sudden loss of a significant portion of the ventricular myocardium leads to impaired systolic and diastolic function. This results in **acute left ventricular failure** and cardiogenic shock [1]. According to standard medical literature (including Harrison’s Principles of Internal Medicine), while arrhythmias are common, **cardiac failure remains the most common cause of death in patients who reach the hospital** and the leading cause of in-hospital mortality following an MI [3]. **2. Why the other options are incorrect:** * **Ventricular Fibrillation (VF):** This is the most common cause of **pre-hospital** death (sudden cardiac death) within the first hour of an MI [2]. However, in a clinical or hospital setting, cardiac failure is statistically the leading cause of mortality. * **Atrial Fibrillation:** While common post-MI due to atrial ischemia or stretch [4], it is rarely a direct cause of death; it primarily complicates the clinical course by causing hemodynamic instability. * **Cardiac Tamponade:** This typically occurs due to **ventricular free wall rupture**, which is a mechanical complication that usually manifests **3 to 7 days** after the infarction, not within the first few hours [1]. **Clinical Pearls for NEET-PG:** * **Most common cause of death (Overall/Pre-hospital):** Ventricular Fibrillation [2]. * **Most common cause of death (In-hospital):** Cardiac Failure/Cardiogenic Shock [3]. * **Most common arrhythmia in MI:** Ventricular Premature Complexes (VPCs). * **Timeframe for Myocardial Rupture:** 3–7 days (due to macrophage-mediated wall weakening) [1].

Question 133: A young man with a history of breathlessness while walking to the gym has an ejection murmur on examination that increases with the Valsalva maneuver. Echocardiogram shows left ventricular hypertrophy (LVH) with deep Q waves in anterior chest leads. What should this patient avoid?

A. Regular walking in the gym
B. Verapamil
C. Digitalis (Correct Answer)
D. Sublingual nitroglycerine

Explanation: ### Explanation **Diagnosis:** The clinical presentation—a young patient with exertional breathlessness, an ejection systolic murmur that **increases with Valsalva**, and LVH with deep Q waves (pseudoinfarct pattern) on ECG—is a classic description of **Hypertrophic Obstructive Cardiomyopathy (HOCM)** [1]. **Why Digitalis is the Correct Answer:** In HOCM, the primary pathology is dynamic Left Ventricular Outflow Tract (LVOT) obstruction. The degree of obstruction is worsened by factors that increase myocardial contractility or decrease ventricular volume. **Digitalis (Digoxin)** is a positive inotrope; by increasing the force of contraction, it narrows the outflow tract further, worsening the obstruction and potentially leading to hemodynamic collapse. Therefore, it is strictly contraindicated. **Analysis of Incorrect Options:** * **A. Regular walking:** While competitive sports and heavy isometric lifting (like heavy gym workouts) are contraindicated in HOCM to prevent sudden cardiac death, low-to-moderate intensity aerobic exercise like regular walking is generally encouraged. * **B. Verapamil:** This is a Non-dihydropyridine Calcium Channel Blocker. It is a **first-line treatment** for HOCM (along with Beta-blockers) because its negative inotropic and chronotropic effects improve diastolic filling and reduce the LVOT gradient. * **D. Sublingual Nitroglycerine:** While nitrates (vasodilators) should generally be avoided in HOCM because they decrease preload and worsen obstruction, **Digitalis** is the more "absolute" contraindication in the context of standard pharmacological teaching for this condition. (Note: Nitrates are often avoided, but Digitalis is the classic "never give" drug in HOCM exams). **High-Yield Clinical Pearls for NEET-PG:** * **Murmur Dynamics:** HOCM and Mitral Valve Prolapse (MVP) are the only two murmurs that **increase** in intensity with **Valsalva** and **Standing** (due to decreased preload). * **ECG Findings:** "Pseudoinfarct" patterns (deep narrow Q waves) are common in lateral and inferior leads [1]. * **Drugs to Avoid:** Remember the mnemonic **"Di-Di-Ni"**: **Di**gitalis, **Di**uretics (excessive), and **Ni**trates. * **Drug of Choice:** Beta-blockers (e.g., Metoprolol) or Verapamil.

Question 134: A 25-year-old man presents with headache, dizziness, and bilateral leg claudication. Physical examination reveals hypertension in the upper limbs and hypotension in the lower limbs. Which of the following additional findings is most likely in this patient?

A. Aortic valvular stenosis
B. Notching of inferior margins of ribs (Correct Answer)
C. Patent ductus arteriosus
D. Vasculitis involving the aortic arch

Explanation: This patient presents with the classic triad of **Coarctation of the Aorta (CoA)**: upper limb hypertension, lower limb hypotension (radio-femoral delay), and intermittent claudication [1]. ### **Explanation of the Correct Answer** In post-ductal coarctation, the narrowing occurs distal to the left subclavian artery. To bypass the obstruction, extensive **collateral circulation** develops via the internal mammary and intercostal arteries. The intercostal arteries become dilated and tortuous; their constant pulsation causes pressure erosion of the **inferior margins of the 3rd to 8th ribs**. This is seen radiographically as **"Rib Notching"** (Roesler’s sign). ### **Analysis of Incorrect Options** * **A. Aortic valvular stenosis:** While CoA is frequently associated with a **Bicuspid Aortic Valve** (up to 85% of cases), isolated aortic stenosis does not cause a blood pressure differential between upper and lower limbs. * **C. Patent ductus arteriosus (PDA):** PDA typically presents with a continuous machinery murmur and bounding pulses [2]. While it can coexist with CoA (pre-ductal type), it is not the cause of rib notching or the classic adult presentation described. * **D. Vasculitis involving the aortic arch:** This refers to **Takayasu Arteritis**. While it can cause pulse deficits ("pulseless disease"), it typically affects females and involves the branches of the aortic arch, often leading to asymmetrical pulses between the two arms, rather than a consistent upper-vs-lower limb gradient. ### **NEET-PG High-Yield Pearls** * **Chest X-ray:** Look for the **"Figure of 3" sign** (indentation of the aorta at the site of coarctation with pre- and post-stenotic dilatation). * **Associations:** Strongly associated with **Turner Syndrome** (45, XO) [1]. * **Physical Exam:** Always check for **Radio-femoral delay** [1]. * **Complications:** Berry aneurysms (Circle of Willis), infective endocarditis, and premature coronary artery disease [1].

Question 135: All of the following are cardiovascular complications of HIV infection, EXCEPT:

A. Aortic Aneurysm (Correct Answer)
B. Cardiomyopathy
C. Pericardial Effusion
D. Cardiac Tamponade

Explanation: The cardiovascular manifestations of HIV are diverse, primarily resulting from direct viral effects, opportunistic infections, or the metabolic side effects of Highly Active Antiretroviral Therapy (HAART). **Why Aortic Aneurysm is the Correct Answer:** While HIV is associated with various vasculitides and premature atherosclerosis (due to chronic inflammation and HAART), **Aortic Aneurysm** is not a classic or direct cardiovascular complication of HIV infection itself. In contrast, HIV-associated vasculopathy typically manifests as small to medium-vessel disease or accelerated coronary artery disease. **Analysis of Incorrect Options:** * **Cardiomyopathy:** HIV-associated cardiomyopathy (often Dilated Cardiomyopathy) is a well-documented complication. It can be caused by direct HIV invasion of myocytes, nutritional deficiencies (selenium), or myocarditis due to opportunistic pathogens like Coxsackievirus or CMV. * **Pericardial Effusion:** This is the **most common** cardiac manifestation of HIV. It is often asymptomatic but can be caused by opportunistic infections (e.g., *M. tuberculosis*, *Cryptococcus*), malignancy (Kaposi sarcoma), or "capillary leak syndrome" in advanced AIDS. * **Cardiac Tamponade:** While less common than simple effusion, pericardial effusions in HIV patients (especially those caused by Tuberculosis) can progress to life-threatening cardiac tamponade. **NEET-PG High-Yield Pearls:** 1. **Most common cardiac abnormality in HIV:** Pericardial Effusion. 2. **Most common cause of symptomatic heart failure in HIV:** Dilated Cardiomyopathy (DCM). 3. **Infective Endocarditis in HIV:** Usually associated with IV drug use (right-sided, *S. aureus*). 4. **HAART Impact:** Protease Inhibitors (PIs) are notorious for causing dyslipidemia and insulin resistance, leading to premature **Coronary Artery Disease (CAD)**.

Question 136: A 57-year-old woman presents to the hospital with a 2-hour history of retrosternal chest pain and dyspnea. Her electrocardiogram (ECG) reveals an acute myocardial infarction pattern. Which of the following ECG patterns is consistent with that interpretation?

A. tall P waves
B. prominent U waves
C. small QRS complex
D. elevated ST segments (Correct Answer)

Explanation: **Explanation:** The clinical presentation of retrosternal chest pain and dyspnea in a 57-year-old is highly suggestive of **Acute Coronary Syndrome (ACS)** [4]. In the context of an acute myocardial infarction (MI), the ECG is the primary diagnostic tool used to differentiate between STEMI and NSTEMI [1]. **Why the correct answer is right:** * **Elevated ST segments:** This is the hallmark of a **STEMI (ST-Elevation Myocardial Infarction)** [1], [2]. It represents transmural myocardial ischemia and injury. The elevation occurs because the injured myocardium remains partially depolarized, creating a "current of injury" between the affected and healthy tissue during the TP and ST intervals. **Why the incorrect options are wrong:** * **Tall P waves (P-pulmonale):** These are typically seen in **Right Atrial Enlargement**, often due to chronic obstructive pulmonary disease (COPD) or pulmonary hypertension, not acute MI. * **Prominent U waves:** These are most commonly associated with **Hypokalemia**. They may also be seen in bradycardia or with certain drugs (e.g., Digoxin, Class IA antiarrhythmics). * **Small QRS complex (Low voltage):** This is characteristic of conditions that insulate the heart or reduce its muscle mass, such as **pericardial effusion**, obesity, emphysema, or restrictive cardiomyopathy (amyloidosis). **High-Yield Clinical Pearls for NEET-PG:** * **Evolution of STEMI on ECG:** Hyperacute T waves → ST elevation → Q waves (signifying necrosis) → T wave inversion [1]. * **Reciprocal Changes:** Look for ST depression in leads opposite to those showing ST elevation (e.g., ST elevation in II, III, aVF with reciprocal depression in I and aVL suggests an Inferior Wall MI) [1]. * **New Left Bundle Branch Block (LBBB):** In a patient with typical chest pain, a new-onset LBBB is considered a STEMI equivalent [3].

Question 137: Which of the following is NOT a high-risk factor for sudden cardiac death in hypertrophic cardiomyopathy?

A. Family history of sudden cardiac death
B. Non-sustained ventricular tachycardia on cardiac monitoring
C. Left ventricular septal thickness of 2-3 cm (Correct Answer)
D. Abnormal drop in systolic blood pressure

Explanation: In Hypertrophic Cardiomyopathy (HCM), identifying patients at risk for Sudden Cardiac Death (SCD) is crucial for determining the need for an Implantable Cardioverter Defibrillator (ICD) [1]. **Explanation of the Correct Answer:** **Option C** is the correct answer because the threshold for high risk is a maximal Left Ventricular Wall Thickness (LVWT) of **≥30 mm (3 cm)**. A thickness of 2-3 cm (20-29 mm) is considered moderate hypertrophy but does not meet the major risk criterion on its own. Extreme hypertrophy (≥30 mm) is a potent predictor of SCD, especially in younger patients. **Explanation of Incorrect Options:** * **Option A (Family History):** A history of SCD in one or more first-degree relatives (aged <40 years) is a major risk factor, suggesting a malignant genetic mutation [1]. * **Option B (NSVT):** Non-sustained ventricular tachycardia (defined as ≥3 beats at ≥120 bpm lasting <30 seconds) on Holter monitoring indicates electrical instability and is a significant risk marker [1]. * **Option D (Abnormal BP Response):** A failure of systolic BP to rise by >20 mmHg or a drop in BP during exercise testing indicates hemodynamic instability and an inability to increase cardiac output, marking high risk [1]. **High-Yield Clinical Pearls for NEET-PG:** * **Major Risk Factors for SCD in HCM:** 1. Prior cardiac arrest or sustained VT (Secondary prevention). 2. Family history of SCD. 3. Unexplained syncope (recent). 4. LV wall thickness ≥30 mm. 5. Abnormal exercise BP response. 6. NSVT on monitoring. * **HCM Murmur:** Increases with Valsalva and standing (decreased preload); decreases with squatting and handgrip. * **Management:** Beta-blockers are first-line; ICD is the only proven method to prevent SCD [1].

Question 138: Cardiomyopathy is a recognized finding in all of the following conditions except?

A. Friedreich's ataxia
B. Transfusion hemosiderosis
C. Cystic fibrosis
D. None of the above (Correct Answer)

Explanation: **Explanation:** The correct answer is **None of the above** because all three conditions listed (Friedreich's ataxia, Transfusion hemosiderosis, and Cystic fibrosis) are clinically associated with the development of cardiomyopathy [1]. 1. **Friedreich's Ataxia (FA):** This is an autosomal recessive trinucleotide repeat (GAA) disorder. Hypertrophic cardiomyopathy is a hallmark feature, occurring in up to 90% of patients [1]. It typically presents as concentric left ventricular hypertrophy and can eventually progress to heart failure, which is the leading cause of death in FA patients. 2. **Transfusion Hemosiderosis:** Chronic blood transfusions (e.g., in Thalassemia major) lead to iron overload. Iron deposits in the myocardium, causing **Restrictive Cardiomyopathy** initially, which later evolves into **Dilated Cardiomyopathy** [2]. This is a classic "infiltrative" cause of heart muscle disease. 3. **Cystic Fibrosis (CF):** While primarily a pulmonary disease, CF can lead to cardiomyopathy through two mechanisms: * **Cor Pulmonale:** Right-sided heart failure due to chronic pulmonary hypertension. * **Direct Myocardial Involvement:** Chronic inflammation, nutritional deficiencies (Selenium/Vitamin E), and CFTR protein dysfunction in cardiac myocytes can lead to primary myocardial fibrosis and dilated cardiomyopathy [2]. **NEET-PG High-Yield Pearls:** * **Friedreich’s Ataxia:** Most common cause of death is **HOCM/Heart Failure**. * **Iron Overload:** The most sensitive tool for monitoring cardiac iron is **Cardiac T2* MRI**. * **Hemochromatosis:** Often presents as the "Bronze Diabetes" triad (Pigmentation, Diabetes, and Cirrhosis/Cardiomyopathy).

Question 139: ST depression and T wave inversion in leads V1 to V6 and aVL indicate which of the following?

A. Anterolateral wall AMI (Correct Answer)
B. Posterior wall AMI
C. Inferior AMI
D. Lateral wall AMI

Explanation: **Explanation:** The presence of ST-segment and T-wave changes in leads **V1 to V6** (precordial leads) and **aVL** (lateral lead) signifies pathology involving the **Anterolateral wall** of the left ventricle [2]. 1. **Why Anterolateral AMI is correct:** In the context of an Acute Myocardial Infarction (AMI), leads V1–V4 represent the **Anterior wall**, while leads V5, V6, I, and aVL represent the **Lateral wall** [2]. When changes occur across V1 through V6 plus aVL, it indicates a massive infarction involving both territories, typically due to a proximal occlusion of the **Left Anterior Descending (LAD) artery** or the **Left Main Coronary Artery**. While ST-elevation is the hallmark of STEMI [3], ST-depression and T-wave inversion in these leads signify **NSTEMI** or severe subendocardial ischemia of the anterolateral wall. 2. **Why other options are incorrect:** * **Posterior wall AMI:** Characterized by *reciprocal* ST-depression and tall R waves in V1–V3. It does not typically involve V4–V6 or aVL. * **Inferior AMI:** Involves leads II, III, and aVF (supplied by the Right Coronary Artery) [1]. * **Lateral wall AMI:** Isolated lateral involvement would typically show changes only in I, aVL, V5, and V6, sparing the septal/anterior leads (V1–V4). **High-Yield Clinical Pearls for NEET-PG:** * **LAD Occlusion:** Known as the "Widow Maker." * **Lead Groupings:** * Septal: V1, V2 * Anterior: V3, V4 [2] * Lateral: I, aVL, V5, V6 * Inferior: II, III, aVF [1] * **Wellen’s Syndrome:** Deeply inverted or biphasic T-waves in V2–V3; a critical warning sign of high-grade proximal LAD stenosis.

Question 140: Anacrotic pulse is seen in which of the following conditions?

A. Aortic regurgitation
B. Mitral regurgitation
C. Mitral stenosis
D. Aortic stenosis (Correct Answer)

Explanation: **Explanation:** The **Anacrotic pulse** (from the Greek *ana* meaning up and *krotos* meaning beat) is a small-volume, slow-rising pulse characterized by a notch on the ascending limb of the arterial pulse wave. **Why Aortic Stenosis is correct:** In **Aortic Stenosis (AS)**, there is a mechanical obstruction to the left ventricular outflow. This results in a prolonged ejection time as the heart struggles to pump blood through a narrowed valve. This produces the classic **"Pulsus Parvus et Tardus"** (small volume and late/slow-rising pulse). The "anacrotic notch" occurs because the initial ejection is interrupted by the resistance of the stenotic valve, making it a hallmark finding of severe valvular AS [1]. **Why the other options are incorrect:** * **Aortic Regurgitation:** Characterized by a **Water-hammer pulse** (Corrigan’s pulse), which is a large-volume, rapidly collapsing pulse due to increased stroke volume and rapid runoff into the aorta and back into the ventricle [3], [4]. * **Mitral Regurgitation:** Usually presents with a normal or slightly low-volume pulse (if cardiac output is reduced), but never an anacrotic pulse [2]. * **Mitral Stenosis:** Typically presents with a **low-volume pulse** (Pulsus Parvus) due to reduced stroke volume, but the upstroke remains normal. **High-Yield Clinical Pearls for NEET-PG:** * **Pulsus Bisferiens:** Seen in AR + AS or Hypertrophic Obstructive Cardiomyopathy (HOCM). * **Pulsus Alternans:** A sign of severe Left Ventricular Failure (LVF). * **Pulsus Paradoxus:** Characterized by a >10 mmHg drop in systolic BP during inspiration; seen in Cardiac Tamponade, Severe Asthma, and COPD. * **Dicrotic Pulse:** A double-peaked pulse with the second peak in diastole; seen in low cardiac output states like dilated cardiomyopathy or febrile states (Typhoid) [3].

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Coronary Artery Disease and Angina

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Acute Coronary Syndromes

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Heart Failure

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Cardiac Arrhythmias

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Valvular Heart Diseases

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Cardiomyopathies

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Pericardial Diseases

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Congenital Heart Disease in Adults

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Hypertension and Hypertensive Emergencies

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Pulmonary Hypertension

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Non-invasive Cardiac Diagnostics

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Cardiology — MCQs

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