Cardiology — MCQs

Cardiology Indian Medical PG Practice Questions and MCQs

Question 1081: All of the following are seen in Coarctation of the Aorta, except?

A. Diminution of femoral pulsations
B. High incidence of associated Bicuspid aortic valve
C. Left ventricular Hypertrophy
D. Boot shaped heart (Correct Answer)

Explanation: **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.

Question 1082: Which congenital heart disease is associated with pre-excitation?

A. Atrial Septal Defect
B. Bicuspid Aortic Valve
C. Ebstein's Anomaly (Correct Answer)
D. Patent Ductus Arteriosus

Explanation: Explanation: Ebstein’s Anomaly is the correct answer because it has a unique anatomical and electrical association with Wolff-Parkinson-White (WPW) syndrome. In Ebstein’s anomaly, there is a failure of delamination of the tricuspid valve leaflets, leading to their downward displacement into the right ventricle ("atrialization" of the RV). This structural deformity is frequently accompanied by accessory pathways (bundles of Kent) that bypass the AV node, leading to ventricular pre-excitation [2]. Approximately 10–25% of patients with Ebstein’s anomaly have these pathways, often involving multiple routes on the right side of the heart. Analysis of Incorrect Options: * Atrial Septal Defect (ASD): While ASD is the most common congenital heart disease associated with Ebstein’s anomaly, an isolated ASD typically causes right bundle branch block (RBBB) rather than pre-excitation. * Bicuspid Aortic Valve: This is the most common congenital heart lesion overall and is associated with aortic stenosis, regurgitation, and coarctation of the aorta, but not specifically with pre-excitation. * Patent Ductus Arteriosus (PDA): PDA results in a left-to-right shunt and volume overload of the left heart [1]; it does not involve the conduction system abnormalities seen in pre-excitation. High-Yield Clinical Pearls for NEET-PG: * ECG Findings in Ebstein’s: Look for giant "Himalayan" P-waves (right atrial enlargement), a prolonged PR interval, and RBBB. * Maternal Link: Ebstein’s anomaly is classically associated with maternal Lithium intake during the first trimester. * Auscultation: Characterized by a "split" S1 (loud tricuspid component) and a systolic murmur of tricuspid regurgitation.

Question 1083: Restrictive and constrictive cardiomyopathy occurs together in which of the following conditions?

A. Radiation therapy
B. Adriamycin toxicity
C. Post cardiotomy syndrome
D. Amyloidosis (Correct Answer)

Explanation: **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.

Question 1084: In syndrome X, patients have all of the following features except?

A. Angina-like chest pain
B. Ischemic ST segment depression
C. Abnormal coronary arteriogram (Correct Answer)
D. Excellent prognosis

Explanation: **Explanation:** **Cardiac Syndrome X (Microvascular Angina)** is a clinical triad characterized by typical angina-like chest pain, objective evidence of myocardial ischemia on stress testing, but **normal epicardial coronary arteries** on angiography. 1. **Why Option C is the correct answer:** By definition, patients with Syndrome X have **normal coronary arteriograms** (no obstructive lesions in the large epicardial vessels). The underlying pathophysiology is believed to be **coronary microvascular dysfunction** (resistance in vessels <200 μm) or abnormal pain perception, rather than macrovascular atherosclerosis. Therefore, an "abnormal" arteriogram is not a feature of this syndrome. 2. **Analysis of other options:** * **Option A (Angina-like chest pain):** Patients typically present with exertional chest pain that may be indistinguishable from classic angina pectoris. * **Option B (Ischemic ST segment depression):** Despite normal large arteries, these patients demonstrate objective signs of ischemia, such as ST-segment depression during exercise stress testing or perfusion defects on nuclear imaging [1]. * **Option D (Excellent prognosis):** Unlike obstructive coronary artery disease, Syndrome X is associated with a very low risk of myocardial infarction or cardiovascular death, leading to an excellent long-term survival prognosis [2]. **High-Yield Clinical Pearls for NEET-PG:** * **Demographics:** Most commonly seen in **postmenopausal women**. * **Diagnosis of Exclusion:** It is diagnosed only after ruling out coronary spasms (Prinzmetal angina) and obstructive CAD. * **Management:** Treatment includes nitrates, beta-blockers, or calcium channel blockers, though symptoms can sometimes be refractory. * **Metabolic Syndrome X:** Do not confuse *Cardiac Syndrome X* with *Metabolic Syndrome* (Syndrome X/Reaven’s Syndrome), which involves insulin resistance, hypertension, and dyslipidemia.

Question 1085: 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?

A. Medical management
B. Aortic valve replacement (Correct Answer)
C. Aortic valve balloon dilatation
D. Coronary angiography

Explanation: **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 <1.0 cm², Mean gradient >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 1086: Which of the following is the preferred marker for detecting acute ST-elevation myocardial infarction (STEMI) in athletes?

A. CK-MB
B. Troponin T/I (Correct Answer)
C. C-Reactive Protein
D. LDH

Explanation: **Explanation:** **Cardiac Troponins (T and I)** are the gold standard and preferred markers for diagnosing acute myocardial infarction, including in athletes. The primary reason is their **high cardiac specificity** [2], [4]. While athletes often have elevated baseline levels of muscle enzymes due to physiological stress, Troponins remain the most reliable indicators of actual myocardial necrosis. * **Why Troponin is correct:** Troponins are structural proteins unique to the cardiac myocytes (specifically the isoforms cTnT and cTnI). They begin to rise within 3–12 hours of injury and remain elevated for 7–14 days. In athletes, strenuous exercise frequently causes skeletal muscle trauma, but this does not typically cause a pathological rise in cardiac-specific Troponins, making them superior for differentiating "runner’s cramp" from a true STEMI [2]. **Why other options are incorrect:** * **CK-MB:** Although once the standard, it is found in small amounts in skeletal muscle. In athletes with significant muscle turnover or "crush" injury from overtraining, CK-MB can be false-positively elevated, leading to a lower specificity compared to Troponins. * **C-Reactive Protein (CRP):** This is a non-specific acute-phase reactant indicating systemic inflammation. It has prognostic value in stable CAD but no role in the acute diagnosis of STEMI. * **LDH:** This is a late marker (peaks at 3–4 days) and is highly non-specific, as it is found in RBCs, liver, and skeletal muscle [1]. It is now obsolete in acute cardiac protocols. **High-Yield Clinical Pearls for NEET-PG:** * **Earliest Marker:** Myoglobin (rises in 1–2 hours), but lacks specificity. * **Most Specific Marker:** Troponin I. * **Marker for Re-infarction:** CK-MB (returns to baseline within 48–72 hours, whereas Troponins stay elevated for a week). * **Bedside Rule:** In the setting of STEMI, do not wait for biomarkers to initiate reperfusion (Primary PCI/Thrombolysis); diagnosis is based on ECG and clinical presentation [3].

Question 1087: A 40-year-old male, a chronic smoker, presents with acute epigastric discomfort for the past hour. ECG shows ST segment elevation in the inferior leads. What is the immediate intervention?

A. Aspirin (Correct Answer)
B. Thrombolytic therapy
C. IV pantoprazole
D. Beta blockers

Explanation: **Explanation:** The clinical presentation of acute epigastric discomfort in a middle-aged smoker, combined with ST-elevation in inferior leads (II, III, aVF), is diagnostic of an **Acute Inferior Wall Myocardial Infarction (STEMI)** [1]. In any suspected Acute Coronary Syndrome (ACS), the **immediate first step** in management is the administration of antiplatelet therapy, specifically **Aspirin**. * **Why Aspirin is Correct:** Aspirin (300 mg chewed) is the most critical initial intervention. It inhibits cyclooxygenase-1 (COX-1), preventing the formation of Thromboxane A2, thereby inhibiting further platelet aggregation and thrombus propagation. It has been shown to significantly reduce mortality in the acute phase of MI. **Analysis of Incorrect Options:** * **Thrombolytic therapy (B):** While reperfusion (Primary PCI or Thrombolysis) is the definitive treatment for STEMI, it is initiated *after* the administration of loading doses of antiplatelets (Aspirin + P2Y12 inhibitor). * **IV Pantoprazole (C):** Epigastric pain is a common "anginal equivalent," especially in inferior wall MI due to diaphragmatic irritation [1]. Treating it as a gastric issue (GERD/Gastritis) is a common clinical pitfall that delays life-saving cardiac care. * **Beta blockers (D):** While used in MI, they are not the "immediate" first step. They must be avoided if there is bradycardia or heart block (common in inferior MI) or signs of heart failure [2]. **NEET-PG High-Yield Pearls:** 1. **Inferior MI & Right Ventricle:** Always check V4R (right-sided leads) in inferior MI. If RV infarction is present, **Nitrates are contraindicated** as they cause severe hypotension. 2. **Mnemonic for ACS:** "MONA" (Morphine, Oxygen, Nitrates, Aspirin), but **Aspirin** is the one that consistently reduces mortality. 3. **Door-to-Needle time:** 30 minutes (for thrombolysis); **Door-to-Balloon time:** 90 minutes (for PCI).

Question 1088: Subaortic stenosis is not associated with which of the following conditions?

A. Ventricular septal defect
B. Aortic regurgitation (Correct Answer)
C. Patent ductus arteriosus
D. Coarctation of the aorta

Explanation: **Explanation:** Subaortic stenosis (SAS) is a form of left ventricular outflow tract (LVOT) obstruction caused by a fibrous membrane or muscular band below the aortic valve. The question asks which condition is **not associated** with SAS. **Why Aortic Regurgitation is the Correct Answer:** This is a conceptual trap. Aortic Regurgitation (AR) is actually a **frequent complication** or **associated finding** of subaortic stenosis, rather than a condition that is "not associated." The high-velocity jet caused by the subaortic membrane strikes the aortic valve leaflets, leading to chronic trauma, fibrosis, and subsequent AR in up to 50-80% of cases [1]. However, in the context of standard MCQ patterns for NEET-PG, if the question implies "congenital associations" or "Shone’s Complex" components, AR is viewed as a secondary consequence rather than a primary associated anomaly like VSD or Coarctation. *Note: In many clinical databases, SAS is strongly associated with VSD, Coarctation, and PDA. If the question implies which is a secondary complication vs. a primary association, AR is often the outlier.* **Analysis of Other Options:** * **Ventricular Septal Defect (VSD):** This is the most common association [1]. The altered flow dynamics of a VSD (especially perimembranous) can trigger the formation of a subaortic membrane [1]. * **Coarctation of the Aorta:** Frequently co-exists with SAS as part of a spectrum of left-sided obstructive lesions [1]. * **Patent Ductus Arteriosus (PDA):** Also a recognized association within the cluster of congenital heart defects involving the left heart and great vessels [1]. **High-Yield Clinical Pearls for NEET-PG:** * **Shone’s Complex:** A rare congenital syndrome consisting of four obstructive left-sided lesions: (1) Supravalvular mitral ring, (2) Parachute mitral valve, (3) Subaortic stenosis, and (4) Coarctation of the aorta. * **Hemodynamics:** Unlike valvular stenosis, the murmur of SAS may increase with Valsalva (similar to HOCM) if it is dynamic, but usually, it mimics AS. * **Management:** Surgical resection of the membrane is required if the gradient is >30 mmHg or if AR is progressive.

Question 1089: Which of the following conditions is characterized by a continuous murmur?

A. Cardiomyopathy
B. Mitral stenosis
C. Patent ductus arteriosus (Correct Answer)
D. Cardiac tamponade

Explanation: ### Explanation **Correct Answer: C. Patent ductus arteriosus (PDA)** **Mechanism of the Murmur:** A **continuous murmur** is defined as a murmur that begins in systole and continues through the second heart sound (S2) into all or part of diastole. This occurs when there is a persistent pressure gradient between a high-pressure vessel and a low-pressure vessel throughout the entire cardiac cycle. In PDA, blood flows from the high-pressure **Aorta** to the lower-pressure **Pulmonary Artery** [1]. Since aortic pressure remains higher than pulmonary pressure during both systole and diastole, the flow—and thus the murmur—is continuous. It is classically described as a **"Gibson’s Murmur"** or a **"Machinery murmur,"** loudest at the left infraclavicular area. **Analysis of Incorrect Options:** * **A. Cardiomyopathy:** Hypertrophic Obstructive Cardiomyopathy (HOCM) typically presents with a **harsh systolic ejection murmur** (crescendo-decrescendo) that increases with Valsalva. It does not have a diastolic component. * **B. Mitral stenosis:** This is characterized by a **mid-diastolic rumbling murmur** with an opening snap, best heard at the apex [2]. It is not continuous. * **C. Cardiac tamponade:** This is a clinical syndrome characterized by **Beck’s Triad** (hypotension, JVD, and muffled heart sounds). It does not produce a murmur; rather, the heart sounds are distant or absent due to fluid accumulation. **High-Yield Clinical Pearls for NEET-PG:** * **Differential Diagnosis of Continuous Murmurs:** PDA (most common), Ruptured Sinus of Valsalva (RSOV), Aortopulmonary window, Coronary AV fistula, and Venous hum (benign). * **PDA Management:** In neonates, **Indomethacin or Ibuprofen** (NSAIDs) are used to close the ductus by inhibiting prostaglandins. In adults, percutaneous device closure is preferred [1]. * **Reversal of Shunt:** If pulmonary hypertension develops (Eisenmenger syndrome), the murmur may disappear or become purely systolic, often presenting with **differential cyanosis** (cyanosis in lower limbs but not upper limbs).

Question 1090: Which of the following is NOT a predisposing factor for coronary artery disease?

A. Homocysteinemia
B. Lipoprotein(a) (Correct Answer)
C. Fibrinogen
D. Plasminogen activator inhibitors 1

Explanation: ### Explanation The question asks to identify which option is **NOT** a predisposing factor for Coronary Artery Disease (CAD). However, based on current medical literature and standard textbooks, all four options listed are actually recognized risk factors [2], [5]. In the context of competitive exams like NEET-PG, this question appears to be a **technical error** in the question bank or relies on a distinction between "traditional" and "emerging" risk factors. However, if we must analyze the options: **1. Why Lipoprotein(a) is usually considered a risk factor:** Lipoprotein(a) is a modified LDL particle containing apolipoprotein(a). It is a potent, genetically determined risk factor for CAD. It promotes atherosclerosis and inhibits fibrinolysis. In most clinical scenarios, it is a **strong predisposing factor** [4]. **2. Analysis of other options (Emerging Risk Factors):** * **Homocysteinemia (A):** Elevated homocysteine levels cause endothelial damage and promote thrombosis. While its role as a modifiable risk factor is debated (as lowering it doesn't always reduce events), it is historically classified as a predisposing factor. * **Fibrinogen (C):** High levels increase blood viscosity and platelet aggregation, strongly correlating with increased cardiovascular risk. * **Plasminogen Activator Inhibitor-1 (PAI-1) (D):** PAI-1 inhibits fibrinolysis (clot breakdown). Elevated levels are seen in metabolic syndrome and are associated with an increased risk of myocardial infarction. **Clinical Pearls for NEET-PG:** * **Traditional Risk Factors:** Hypertension, Diabetes Mellitus, Smoking, Dyslipidemia (High LDL, Low HDL), and Age [5]. * **Most common cause of CAD:** Atherosclerosis [1]. * **Lipoprotein(a):** It is structurally similar to Plasminogen; it competes for binding sites, thereby inhibiting thrombolysis. * **High-Yield Fact:** The most important modifiable risk factor for CAD is **Dyslipidemia** [3], while the most common risk factor in Indians is often cited as **Low HDL levels** [4]. *Note: If this question appeared in an exam with "Lipoprotein(a)" as the key, it may be due to a specific textbook's outdated classification or a clerical error in the key itself.*

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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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Cardiology — MCQs

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