Cardiology — MCQs
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Which right-sided cardiac sound decreases in intensity with inspiration?
Angina pectoris and syncope are most likely to be associated with which of the following valvular heart diseases?
A patient presents with angina, dyspnea, and syncope. What is the most likely diagnosis?
A 26-year-old man complains of abdominal distension, swelling of the legs, and easy fatigability. His blood pressure is 90/70 mm Hg and pulse becomes difficult to feel on deep inspiration. JVP is grossly elevated and rises further on deep inspiration. He has pedal edema, ascites, and tender hepatomegaly. The precordium is quiet with a loud and somewhat early third heart sound. What is the probable diagnosis?
Which drug is commonly used in the management of unstable angina and non-ST-elevation myocardial infarction (NSTEMI)?
Maximal deaths in myocardial infarction (MI) occurs within what time frame?
A 20-year-old female presents with a blood pressure of 160/110 mm Hg. Clinical examination reveals a bruit in both flanks. Which of the following statements about this patient is not true?
Why is chemical cardioversion considered for patients with recurrent episodes of atrial fibrillation?
Which of the following features is characteristic of constrictive pericarditis, helping to differentiate it from restrictive cardiomyopathy?
Bacterial endocarditis is most commonly seen in which of the following conditions?
Cardiology Indian Medical PG Practice Questions and MCQs
Question 731: Which right-sided cardiac sound decreases in intensity with inspiration?
- A. Pulmonary ejection sound (Correct Answer)
- B. Right ventricular S3
- C. Systolic murmur of pulmonic stenosis
- D. Systolic murmur of tricuspid regurgitation
Explanation: **Explanation:** The **Pulmonary Ejection Sound (PES)** is the only right-sided heart sound that **decreases** in intensity during inspiration [1]. This is a classic high-yield exception to the general rule that right-sided sounds increase with inspiration. **Mechanism:** During inspiration, increased venous return to the right ventricle (RV) causes an increase in RV end-diastolic pressure. In the setting of pulmonary stenosis, this increased pressure causes the stenotic pulmonary valve to "dome" upward prematurely during atrial contraction (late diastole). Because the valve is already partially open and under tension when ventricular systole begins, its subsequent excursion is limited, resulting in a softer opening click (decreased intensity). During expiration, the valve starts from a more closed position, leading to a more forceful opening and a louder sound. **Analysis of Incorrect Options:** * **B. Right ventricular S3:** Like most right-sided filling sounds, the RV S3 increases with inspiration due to the increased volume of blood entering the RV (Carvallo’s sign). * **C. Systolic murmur of Pulmonic Stenosis:** Increased venous return during inspiration increases the stroke volume ejected across the pulmonary valve, making the murmur louder. * **D. Systolic murmur of Tricuspid Regurgitation:** Inspiration increases RV filling and subsequent regurgitant flow into the right atrium, increasing the murmur's intensity (Carvallo’s sign). **NEET-PG High-Yield Pearls:** * **General Rule:** All right-sided murmurs and sounds increase with inspiration **EXCEPT** the pulmonary ejection click [1]. * **Carvallo’s Sign:** The increase in intensity of the tricuspid regurgitation murmur during inspiration. * **Ejection Clicks:** A pulmonary ejection click is heard in valvular pulmonary stenosis; it disappears as the stenosis becomes severe [1].
Question 732: Angina pectoris and syncope are most likely to be associated with which of the following valvular heart diseases?
- A. Mitral stenosis
- B. Aortic stenosis (Correct Answer)
- C. Mitral regurgitation
- D. Tricuspid stenosis
Explanation: ### Explanation **Aortic Stenosis (AS)** is characterized by the classic clinical triad: **Angina, Syncope, and Heart Failure (Dyspnea)**. [1] 1. **Angina Pectoris:** In AS, there is significant left ventricular hypertrophy (LVH) to overcome the outflow obstruction. This increases myocardial oxygen demand. Simultaneously, the high intraventricular pressure and reduced aortic root pressure (due to the pressure gradient) decrease coronary perfusion, leading to ischemia even in the absence of coronary artery disease. [1] 2. **Syncope:** This typically occurs during exertion. The fixed cardiac output cannot increase to meet the demands of systemic vasodilation during exercise, leading to a drop in cerebral perfusion. Additionally, high LV pressures can trigger a baroreceptor-mediated vasodepressor response. --- ### Why the other options are incorrect: * **Mitral Stenosis (MS):** Primarily presents with exertional dyspnea, hemoptysis, and palpitations (due to Atrial Fibrillation). [2] Syncope is rare unless there is a massive left atrial thrombus or severe pulmonary hypertension. * **Mitral Regurgitation (MR):** Usually presents with features of left-sided heart failure (dyspnea, orthopnea) and fatigue. Angina and syncope are not hallmark features. * **Tricuspid Stenosis (TS):** Presents with features of right heart failure, such as hepatomegaly, ascites, and peripheral edema. It does not cause systemic hypoperfusion leading to syncope or increased LV demand leading to angina. --- ### NEET-PG High-Yield Pearls: * **The Triad Survival (Rule of 5-3-2):** Once symptoms appear, average survival is: Angina (5 years), Syncope (3 years), Heart Failure (2 years). * **Physical Exam:** Look for **Pulsus Parvus et Tardus** (slow-rising, low-volume pulse) and a **Crescendo-Decrescendo systolic murmur** radiating to the carotids. [1] * **Gallavardin Phenomenon:** The dissociation between the noisy systolic murmur at the base and musical sounds at the apex. [1] * **Heyde’s Syndrome:** Association of Aortic Stenosis with angiodysplasia of the colon (causing GI bleed).
Question 733: A patient presents with angina, dyspnea, and syncope. What is the most likely diagnosis?
- A. Aortic stenosis (Correct Answer)
- B. Aortic regurgitation
- C. Atrial septal defect
- D. Ventricular septal defect
Explanation: ### Explanation **Correct Answer: A. Aortic Stenosis** The classic triad of **Angina, Dyspnea (Heart Failure), and Syncope** is the hallmark presentation of symptomatic **Aortic Stenosis (AS)**. This is a high-yield clinical association often remembered by the mnemonic **"SAD"** (Syncope, Angina, Dyspnea). * **Angina:** Occurs due to increased myocardial oxygen demand (hypertrophied left ventricle) and decreased supply (compression of coronary arteries) [3]. * **Syncope:** Typically exertional, caused by the inability of the heart to increase cardiac output across a fixed, narrowed orifice during exercise, leading to cerebral hypoperfusion [1]. * **Dyspnea:** Indicates the onset of left ventricular failure and pulmonary venous congestion. **Why other options are incorrect:** * **B. Aortic Regurgitation:** Typically presents with features of high stroke volume and wide pulse pressure (e.g., Water-hammer pulse, Quincke’s sign). While it can cause dyspnea and angina, the classic "SAD" triad is specific to stenosis. * **C & D. ASD and VSD:** These are congenital shunts. **ASD** often remains asymptomatic until adulthood, presenting with exercise intolerance or palpitations (atrial arrhythmias). **VSD** typically presents with a pansystolic murmur and features of congestive heart failure in infancy or childhood, not the classic adult triad of AS. **NEET-PG High-Yield Pearls:** 1. **Murmur of AS:** Harsh crescendo-decrescendo systolic murmur heard best at the right second intercostal space, radiating to the **carotids** [2]. 2. **Physical Sign:** *Pulsus parvus et tardus* (slow-rising, low-amplitude pulse). 3. **Prognosis:** Once symptoms appear, survival drops significantly (Average survival: 2 years for Heart Failure, 3 years for Syncope, 5 years for Angina). 4. **Management:** Symptomatic severe AS requires **Aortic Valve Replacement (AVR)** or TAVI [1]. Medical therapy is generally ineffective for the mechanical obstruction [1].
Question 734: A 26-year-old man complains of abdominal distension, swelling of the legs, and easy fatigability. His blood pressure is 90/70 mm Hg and pulse becomes difficult to feel on deep inspiration. JVP is grossly elevated and rises further on deep inspiration. He has pedal edema, ascites, and tender hepatomegaly. The precordium is quiet with a loud and somewhat early third heart sound. What is the probable diagnosis?
- A. Cor Pulmonale
- B. Tricuspid stenosis
- C. Constrictive pericarditis (Correct Answer)
- D. Pulmonary stenosis
Explanation: ### Explanation The clinical presentation points toward **Constrictive Pericarditis (CP)**, a condition where a thickened, fibrotic, and often calcified pericardium restricts diastolic filling of the heart [1]. **Why Constrictive Pericarditis is correct:** 1. **Kussmaul’s Sign:** The rise in JVP during deep inspiration (instead of the normal fall) is a hallmark of CP, caused by the rigid pericardium preventing the right ventricle from accommodating increased venous return. 2. **Pulsus Paradoxus:** The pulse becoming "difficult to feel on deep inspiration" indicates a significant drop in systolic BP (>10 mmHg), common in CP. 3. **Pericardial Knock:** The "loud and early third heart sound" described is actually a **pericardial knock**, occurring due to the sudden cessation of rapid ventricular filling by the non-compliant pericardium. 4. **Systemic Congestion:** Ascites (often out of proportion to edema), tender hepatomegaly, and pedal edema reflect chronic right-sided heart failure [1]. **Why other options are incorrect:** * **Cor Pulmonale:** While it causes right heart failure and Kussmaul’s sign, it is usually associated with chronic lung disease and would not typically present with a "quiet precordium" or a pericardial knock. * **Tricuspid Stenosis:** This would present with a diastolic murmur (increased on inspiration) and a prominent *'a'* wave in JVP, but not Pulsus Paradoxus or a pericardial knock. * **Pulmonary Stenosis:** This presents with a harsh systolic ejection murmur and right ventricular hypertrophy (active precordium), contradicting the "quiet precordium" seen here. **NEET-PG High-Yield Pearls:** * **Imaging Gold Standard:** Cardiac MRI or CT (to visualize pericardial thickening >3mm). * **JVP Finding:** Characterized by prominent **'x' and 'y' descents** (Friedreich’s sign), giving it a 'W' shape. * **Differentiating from Restrictive Cardiomyopathy:** CP usually has a pericardial knock and thickened pericardium on CT, whereas RCM often lacks these and shows higher BNP levels.
Question 735: Which drug is commonly used in the management of unstable angina and non-ST-elevation myocardial infarction (NSTEMI)?
- A. Morphine (Correct Answer)
- B. Aspirin
- C. Nitrates
- D. Antithrombotic therapy
Explanation: **Explanation:** In the management of Acute Coronary Syndrome (ACS), specifically Unstable Angina (UA) and NSTEMI, the primary goal is to stabilize the patient, relieve symptoms, and prevent further thrombus propagation [2]. **Why Morphine is the Correct Answer:** Morphine is the drug of choice for pain relief in patients with UA/NSTEMI whose symptoms are not relieved by nitrates. Beyond its potent analgesic properties, it acts as a **venodilator**, reducing ventricular preload and myocardial oxygen demand [1]. It also helps alleviate the anxiety associated with chest pain, which further reduces sympathetic drive and heart rate [1]. **Analysis of Incorrect Options:** * **B. Aspirin:** While Aspirin is a cornerstone of ACS management (antiplatelet therapy), the question asks for a drug "commonly used" in the context of symptomatic management and stabilization. In many standardized formats, if the focus is on immediate symptom relief or specific pharmacological categories, Morphine is highlighted for its hemodynamic benefits. * **C. Nitrates:** Nitrates are used for vasodilation; however, they are often contraindicated in specific scenarios (e.g., right ventricular infarct or recent phosphodiesterase inhibitor use). Morphine remains the definitive choice for refractory pain [1]. * **D. Antithrombotic therapy:** This is a broad category (including heparins and antiplatelets) rather than a specific drug. **NEET-PG High-Yield Pearls:** * **MONA Protocol:** The classic mnemonic for initial ACS management is **M**orphine, **O**xygen, **N**itroglycerin, and **A**spirin. * **Caution:** Recent studies suggest Morphine might delay the absorption of oral P2Y12 inhibitors (like Clopidogrel), but it remains the standard for refractory pain in guidelines. * **NSTEMI vs. STEMI:** The key difference is the absence of ST-elevation on ECG and the presence of elevated cardiac biomarkers (Troponins) in NSTEMI [2].
Question 736: Maximal deaths in myocardial infarction (MI) occurs within what time frame?
- A. 0-24 hours (Correct Answer)
- B. 24-48 hours
- C. 48-72 hours
- D. More than 72 hours
Explanation: The majority of deaths following an Acute Myocardial Infarction (AMI) occur within the first **0-24 hours**, with the highest risk concentrated in the first hour (the "Golden Hour"). **Why 0-24 hours is correct:** The primary cause of early mortality in MI is **Ventricular Arrhythmias**, specifically Ventricular Fibrillation (VF). Ischemia leads to electrical instability in the myocardium, often before the patient even reaches the hospital [1]. Within the first 24 hours, the heart is also susceptible to cardiogenic shock if a large territory of the myocardium is infarcted. **Why the other options are incorrect:** * **24-48 hours:** While the risk of arrhythmias remains, it is significantly lower than the immediate post-infarct period [1]. During this window, the inflammatory response begins, and the risk of fibrinous pericarditis starts to rise, but these are rarely fatal compared to initial arrhythmias. * **48-72 hours:** This period is associated with the peak of neutrophil infiltration. While complications like cardiac rupture can occur as the tissue softens (typically days 3-7), the absolute number of deaths is lower than in the first 24 hours. [2] * **More than 72 hours:** Deaths in this phase are usually due to mechanical complications (e.g., papillary muscle rupture, ventricular septal defect) or progressive heart failure, which represent a smaller percentage of total MI-related mortality. **Clinical Pearls for NEET-PG:** * **Most common cause of death (Pre-hospital):** Ventricular Fibrillation [1]. * **Most common cause of death (In-hospital):** Cardiogenic Shock. * **Most common arrhythmia in MI:** Ventricular Premature Contractions (VPCs). * **Timeframe for Myocardial Rupture:** Typically 3–7 days post-MI (when the wall is weakest due to granulation tissue formation).
Question 737: A 20-year-old female presents with a blood pressure of 160/110 mm Hg. Clinical examination reveals a bruit in both flanks. Which of the following statements about this patient is not true?
- A. Enalapril may deteriorate renal function
- B. The most definitive diagnostic procedure is contrast-enhanced angiography
- C. The condition is nearly always bilateral (Correct Answer)
- D. Surgical intervention may be used
Explanation: The clinical presentation of a young female with severe hypertension and bilateral flank bruits is highly suggestive of **Renovascular Hypertension**, most likely due to **Fibromuscular Dysplasia (FMD)**. FMD is the most common cause of renal artery stenosis (RAS) in young women, whereas atherosclerosis is more common in older patients. **1. Why Option C is the Correct Answer (False Statement):** While FMD can be bilateral, it is **not "nearly always" bilateral**. In FMD, bilateral involvement occurs in approximately 35–50% of cases. In contrast, atherosclerotic RAS is more frequently bilateral. Therefore, stating it is nearly always bilateral is clinically inaccurate. [1] **2. Analysis of Other Options:** * **Option A (Enalapril/ACE inhibitors):** In the presence of bilateral renal artery stenosis (suggested by bilateral bruits), ACE inhibitors like Enalapril can cause a precipitous drop in GFR and acute renal failure. This occurs because these drugs block Angiotensin II-mediated vasoconstriction of the efferent arteriole, which is necessary to maintain glomerular capillary pressure. * **Option B (Contrast-enhanced angiography):** Digital Subtraction Angiography (DSA) remains the **gold standard** and most definitive diagnostic procedure. It classically reveals a "string of beads" appearance in FMD. * **Option D (Surgical intervention):** While Percutaneous Transluminal Renal Angioplasty (PTRA) is the treatment of choice for FMD, surgical revascularization is a valid option if angioplasty fails or if the stenosis involves complex branch points. **Clinical Pearls for NEET-PG:** * **FMD vs. Atherosclerosis:** FMD typically affects the **distal two-thirds** of the renal artery; atherosclerosis affects the **ostium/proximal** portion. * **Screening:** Renal Doppler or CT Angiography are initial screening tools, but DSA is definitive [1]. * **ACE-I Warning:** Always suspect bilateral RAS if a patient develops a >30% rise in serum creatinine after starting an ACE inhibitor or ARB.
Question 738: Why is chemical cardioversion considered for patients with recurrent episodes of atrial fibrillation?
- A. It does not change the rhythm but improves the rate.
- B. It prevents the formation of a clot in the atrium.
- C. It is more effective than electrical cardioversion.
- D. It can be done electively without sedation. (Correct Answer)
Explanation: **Explanation:** **1. Why Option D is Correct:** Chemical (pharmacological) cardioversion involves the use of antiarrhythmic drugs (e.g., Flecainide, Amiodarone, or Ibutilide) to restore sinus rhythm [1]. Unlike Direct Current Cardioversion (DCCV), which requires synchronized electrical shocks, chemical cardioversion does not cause physical pain or muscle contraction. Therefore, it can be performed electively in a stable patient without the need for conscious sedation or general anesthesia. This makes it a convenient option for patients with recurrent episodes who are hemodynamically stable [1]. **2. Analysis of Incorrect Options:** * **Option A:** This describes **Rate Control** (using Beta-blockers or CCBs) [1]. Cardioversion, by definition, is a **Rhythm Control** strategy aimed at restoring sinus rhythm. * **Option B:** Cardioversion (chemical or electrical) actually increases the transient risk of thromboembolism due to "atrial stunning." It does not prevent clots; rather, anticoagulation must be ensured before and after the procedure to prevent stroke [1]. * **Option C:** Electrical cardioversion is generally **more effective** and faster than chemical cardioversion, with success rates exceeding 90%. Chemical cardioversion is often less successful, especially if the AF has persisted for a long duration. **Clinical Pearls for NEET-PG:** * **"Pill-in-the-pocket" approach:** Stable patients with infrequent, paroxysmal AF can sometimes self-administer oral Flecainide or Propafenone at home (chemical cardioversion) [1]. * **Prerequisite:** Before any cardioversion (if AF >48 hours), a Transesophageal Echocardiogram (TEE) must rule out an atrial thrombus, or the patient must be anticoagulated for 3 weeks [1]. * **Drug of Choice:** **Ibutilide** is the most effective IV agent for chemical conversion of atrial flutter/fibrillation. **Amiodarone** is preferred in patients with structural heart disease or heart failure [1].
Question 739: Which of the following features is characteristic of constrictive pericarditis, helping to differentiate it from restrictive cardiomyopathy?
- A. Diastolic pressures are not equalized
- B. Mild pericardial effusion is present
- C. Associated with septal hypertrophy
- D. Thickened pericardium is present (Correct Answer)
Explanation: Explanation: Constrictive Pericarditis (CP) and Restrictive Cardiomyopathy (RCM) often present with similar symptoms of right-sided heart failure. The fundamental difference lies in the pathology: CP is a disease of the pericardium (extrinsic compression), while RCM is a disease of the myocardium (intrinsic stiffness) [3]. 1. Why Option D is Correct: A thickened, fibrotic, or calcified pericardium (typically >3-4 mm on CT or MRI) is the hallmark of Constrictive Pericarditis [1]. This rigid shell limits diastolic filling. In contrast, the pericardium in RCM is usually of normal thickness. 2. Analysis of Incorrect Options: * Option A: In CP, there is equalization of diastolic pressures in all four cardiac chambers (the "Square Root Sign" or "Dip and Plateau" pattern). This is a shared feature with RCM, though it is more classic in CP. * Option B: While a small effusion can coexist, it is not a diagnostic differentiator. The defining feature of CP is the chronic scarring and loss of elasticity of the pericardium, not the presence of fluid [1]. * Option C: Septal hypertrophy is a feature of hypertrophic cardiomyopathy or certain infiltrative RCMs (like amyloidosis), but it is not a feature of CP. In CP, the septum often shows "septal bounce" due to ventricular interdependence. NEET-PG High-Yield Pearls: * Ventricular Interdependence: This is the most reliable physiological differentiator. In CP, inspiration causes the nasal septum to shift toward the left ventricle (decreased LV filling), whereas in RCM, the chambers are independent. * Kussmaul’s Sign: Paradoxical rise in JVP during inspiration; seen in both, but more common in CP. * Pericardial Knock: A high-pitched sound heard in early diastole in CP (due to sudden cessation of ventricular filling). * Gold Standard Imaging: Cardiac MRI or CT to measure pericardial thickness. Lateral X-rays may also detect pericardial calcification [2].
Question 740: Bacterial endocarditis is most commonly seen in which of the following conditions?
- A. Ventricular Septal Defect (VSD) (Correct Answer)
- B. Patent Ductus Arteriosus (PDA)
- C. Atrial Septal Defect (ASD)
- D. Aortic Stenosis (AS)
Explanation: The risk of **Infective Endocarditis (IE)** is primarily determined by the degree of **turbulence** in blood flow and the resulting pressure gradient across a cardiac lesion. High-velocity jets cause endothelial damage, leading to the deposition of fibrin and platelets (Non-Bacterial Thrombotic Endocarditis), which serves as a nidus for bacterial colonization. [2] **1. Why VSD is the Correct Answer:** Small to moderate **Ventricular Septal Defects (VSD)** are associated with the highest risk of IE among the options provided [1]. This is due to the high-pressure gradient between the left and right ventricles, which creates significant turbulence and a high-velocity jet that strikes the right ventricular endocardium (MacCallum's patch formation), making it highly susceptible to infection. **2. Analysis of Incorrect Options:** * **Atrial Septal Defect (ASD):** This is the classic "low-risk" lesion [1]. Because the pressure gradient between the atria is minimal, blood flow is laminar rather than turbulent. Therefore, IE is extremely rare in isolated secundum ASDs. * **Patent Ductus Arteriosus (PDA):** While PDA involves turbulent flow, the incidence of IE is statistically lower than that seen in VSD. * **Aortic Stenosis (AS):** While valvular lesions are risk factors, a restrictive VSD remains the more common substrate for IE in the context of congenital heart disease comparisons in standard medical examinations. **Clinical Pearls for NEET-PG:** * **Highest Risk Lesions:** Prosthetic heart valves, previous history of IE, and Cyanotic Congenital Heart Disease (e.g., Tetralogy of Fallot). * **Lowest Risk Lesion:** Secundum ASD and Ischemic Heart Disease without valvular dysfunction. * **Commonest Valve Involved:** Mitral Valve (overall); Tricuspid Valve (in IV drug abusers). * **Commonest Organism:** *Staphylococcus aureus* (Acute/IVDU); *Viridans streptococci* (Subacute) [2].
Practice by Chapter
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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Preventive Cardiology
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