Cardiology — MCQs
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Which is the most common primary malignancy of the heart?
What is the commonest valvular manifestation of acute as well as previous rheumatic carditis?
A pulse deficit greater than 10 is most commonly seen in which of the following conditions?
A 50-year-old female presents to the OPD with shortness of breath. On examination, she is hypotensive, has soft heart sounds, and elevated JVP. Her ECG shows a reduction in the amplitude of QRS complexes. Which of the following is the investigation of choice for diagnosing her condition?
An electrocardiogram (ECG) in a patient with a systolic ejection murmur that shows an incomplete bundle branch block in the precordial lead is most consistent with which of the following conditions?
Severity of mitral stenosis is determined by which of the following?
A 67-year-old man with an 18-year history of type 2 diabetes mellitus presents for a routine physical examination. His temperature is 36.9 C (98.5 F), his blood pressure is 158/98 mm Hg and his pulse is 82/minute and regular. On examination, the physician notes a non tender, pulsatile, mass in the mid-abdomen. A plain abdominal x-ray film with the patient in the lateral position reveals spotty calcification of a markedly dilated abdominal aortic wall. Following surgery, the patient is placed on a low-fat diet to reduce the risk of continued progression of his atherosclerotic disease. A bile acid sequestrant is added to interrupt enterohepatic circulation of bile acids. Which of the following agents was MOST likely prescribed?
In Mitral Valve Prolapse (MVP), which of the following conditions would cause the ejection click to be more accentuated and the murmur to move closer to the first heart sound?
Which of the following findings is shown in the chest leads?
Subvalvular aortic stenosis is known to be associated with all of the following, except:
Cardiology Indian Medical PG Practice Questions and MCQs
Question 1111: Which is the most common primary malignancy of the heart?
- A. Rhabdomyosarcoma
- B. Myxoma (Correct Answer)
- C. Fibroma
- D. Lymphoma
Explanation: The correct answer is B. Myxoma. Understanding the Concept: Primary tumors of the heart are rare, as most cardiac malignancies are metastatic (secondary). Among primary cardiac tumors, approximately 75% are benign, and Myxoma is the most common overall primary cardiac neoplasm in adults. While the question asks for "malignancy," in the context of NEET-PG and standard medical examinations, "Myxoma" is the established answer for the most common primary cardiac neoplasm. It typically arises in the left atrium (75-80%) near the fossa ovalis. Analysis of Options: * A. Rhabdomyosarcoma: This is the most common primary malignant cardiac tumor in children, but it is less common than myxomas in adults. (Note: Angiosarcoma is the most common primary malignant tumor in adults). * C. Fibroma: This is a benign connective tissue tumor, more commonly seen in the pediatric population, often associated with Gorlin syndrome. * D. Lymphoma: Primary cardiac lymphoma is extremely rare and usually occurs in immunocompromised patients. High-Yield Clinical Pearls for NEET-PG: * Triad of Myxoma: Constitutional symptoms (fever, weight loss due to IL-6 production), Embolic phenomena (systemic emboli), and Obstructive symptoms (mimicking mitral stenosis). * Auscultatory Finding: A characteristic "Tumor Plop" (a low-pitched sound heard during early or mid-diastole as the tumor drops into the mitral orifice). * Most Common Primary Cardiac Tumor in Children: Rhabdomyoma (强烈 associated with Tuberous Sclerosis). * Most Common Cardiac Tumor Overall: Metastatic tumors (most commonly from Lung, Breast, or Melanoma).
Question 1112: What is the commonest valvular manifestation of acute as well as previous rheumatic carditis?
- A. Mitral stenosis
- B. Mitral regurgitation (Correct Answer)
- C. Aortic stenosis
- D. Aortic regurgitation
Explanation: **Explanation:** The correct answer is **Mitral Regurgitation (MR)**. This is a high-yield concept in Cardiology, as students often confuse the most common lesion of *chronic* rheumatic heart disease with the most common manifestation across *all* stages. **Why Mitral Regurgitation is correct:** * **Acute Phase:** During acute rheumatic fever (ARF), pancarditis occurs [2]. Valvulitis leads to chordal stretching or annular dilatation, resulting in functional or organic **Mitral Regurgitation** [1]. It is the earliest and most frequent clinical sign of carditis [2]. * **Chronic Phase:** While Mitral Stenosis (MS) is the most *characteristic* long-term result of rheumatic fever, **Mitral Regurgitation remains the most common overall finding** when considering both acute and previous carditis. In many patients, MR persists or coexists with MS [1]. **Why other options are incorrect:** * **Mitral Stenosis (MS):** This is the most common *sequela* of chronic rheumatic heart disease (RHD) and the most common *isolated* valve lesion in long-standing cases. However, it is never seen in the acute phase; it takes years (usually 5–10) for commissural fusion and calcification to develop. * **Aortic Regurgitation (AR):** This is the second most common valve involved in RHD (after the mitral valve), but it rarely occurs in isolation and is less frequent than MR. * **Aortic Stenosis (AS):** Rheumatic fever is a cause of AS, but it is much less common than mitral involvement and almost always occurs in association with mitral valve disease. **NEET-PG High-Yield Pearls:** 1. **Most common valve involved in RHD:** Mitral > Aortic > Tricuspid > Pulmonary (MAT-P). 2. **Most common manifestation (Acute + Chronic):** Mitral Regurgitation. 3. **Most common *isolated* lesion in Chronic RHD:** Mitral Stenosis. 4. **Carey Coombs Murmur:** A short, mid-diastolic murmur heard in acute rheumatic carditis due to functional mitral stenosis (heavy flow over inflamed mitral leaflets); it is *not* due to permanent MS.
Question 1113: A pulse deficit greater than 10 is most commonly seen in which of the following conditions?
- A. Ventricular premature contraction
- B. Atrial flutter
- C. Atrial fibrillation (Correct Answer)
- D. Ventricular fibrillation
Explanation: **Explanation:** **Pulse deficit** is the difference between the apical heart rate (measured by auscultation) and the peripheral pulse rate (measured at the radial artery). It occurs when some ventricular contractions are too weak to open the aortic valve or generate a pressure wave strong enough to be felt peripherally [3]. **Why Atrial Fibrillation (AF) is the correct answer:** In AF, the ventricular rhythm is "irregularly irregular." The varying R-R intervals lead to inconsistent diastolic filling times [2]. When a contraction occurs shortly after a previous one (short diastole), the left ventricle has inadequate time to fill (low stroke volume). This results in a heart sound that can be heard at the apex, but a pulse wave that fails to reach the radial artery, leading to a significant pulse deficit (typically >10 bpm). **Analysis of Incorrect Options:** * **Ventricular Premature Contraction (VPC):** While VPCs can cause a pulse deficit, it is usually intermittent. In AF, the deficit is persistent and more pronounced due to the continuous irregularity. * **Atrial Flutter:** This usually presents with a regular ventricular response (e.g., 2:1 or 4:1 block) [1]. Because the rhythm is regular, diastolic filling is consistent, and a pulse deficit is rarely observed. * **Ventricular Fibrillation:** This is a terminal rhythm with no effective cardiac output. Neither an apical beat nor a peripheral pulse is palpable; therefore, a "deficit" is not clinically applicable. **NEET-PG High-Yield Pearls:** * **Definition:** Pulse Deficit = Apical Rate – Radial Rate. * **Clinical Significance:** A deficit >10 is highly suggestive of **Atrial Fibrillation** [2]. * **Measurement:** For accuracy, two observers should measure the apical and radial pulses simultaneously for one full minute. * **Pulsus Alternans:** Seen in left ventricular failure (alternating strong and weak beats). * **Pulsus Paradoxus:** A drop in systolic BP >10 mmHg during inspiration (seen in Cardiac Tamponade).
Question 1114: A 50-year-old female presents to the OPD with shortness of breath. On examination, she is hypotensive, has soft heart sounds, and elevated JVP. Her ECG shows a reduction in the amplitude of QRS complexes. Which of the following is the investigation of choice for diagnosing her condition?
- A. Ultrasonography (USG)
- B. Positron Emission Tomography (PET)
- C. 2-D Echocardiography (Correct Answer)
- D. M-mode Echocardiography
Explanation: ### Explanation **Diagnosis: Cardiac Tamponade** The clinical presentation describes **Beck’s Triad** (hypotension, muffled/soft heart sounds, and elevated JVP), which is the classic hallmark of cardiac tamponade. The ECG finding of **low voltage QRS complexes** [1] (and potentially electrical alternans) further supports the presence of a large pericardial effusion causing tamponade. **1. Why 2-D Echocardiography is the Correct Answer:** 2-D Echocardiography is the **investigation of choice** because it is rapid, non-invasive, and highly sensitive [1]. It can visualize the "swinging heart" within the pericardial fluid and identify critical diagnostic signs of tamponade, such as: * **Early diastolic collapse of the Right Ventricle (RV).** * **Late diastolic collapse of the Right Atrium (RA).** * Significant respiratory variation in transvalvular flows. **2. Why Other Options are Incorrect:** * **Ultrasonography (USG):** While "Focused Assessment with Sonography for Trauma" (FAST) can detect fluid, 2-D Echo is the specific gold standard for cardiac structural and hemodynamic assessment. * **PET Scan:** This is used for metabolic activity (e.g., oncology or myocardial viability) and has no role in the acute diagnosis of tamponade. * **M-mode Echocardiography:** While M-mode provides high temporal resolution to see the timing of wall collapse, it lacks the spatial context of 2-D imaging required for a comprehensive diagnosis. It is usually an adjunct to 2-D Echo, not the primary choice. **Clinical Pearls for NEET-PG:** * **Pulsus Paradoxus:** A key clinical sign (drop in systolic BP >10 mmHg during inspiration). * **ECG Finding:** **Electrical Alternans** (alternating QRS amplitude) is pathognomonic for large effusions [1]. * **Management:** The definitive treatment for cardiac tamponade is **urgent pericardiocentesis** [1]. * **Chest X-ray:** May show a "Water bottle" or "Money bag" heart appearance.
Question 1115: An electrocardiogram (ECG) in a patient with a systolic ejection murmur that shows an incomplete bundle branch block in the precordial lead is most consistent with which of the following conditions?
- A. A secundum atrial septal defect (ASD). (Correct Answer)
- B. A sinus venosus ASD with partial anomalous pulmonary venous return (PAPVR).
- C. An ostium primum atrial septal defect (ASD).
- D. A complete atrioventricular canal defect.
Explanation: The clinical presentation of a **systolic ejection murmur** (due to increased flow across the pulmonary valve) combined with an **incomplete right bundle branch block (RBBB)** in the precordial leads (rsR' pattern in V1) is the classic hallmark of an **Atrial Septal Defect (ASD)** [1]. **1. Why Option A is Correct:** In an **Ostium Secundum ASD** (the most common type), the volume overload of the right ventricle causes a delay in depolarization, manifesting as an incomplete RBBB [1]. Crucially, the ECG in Secundum ASD typically shows **Right Axis Deviation (RAD)**. This distinguishes it from other types of ASDs. **2. Why the Other Options are Incorrect:** * **Option C & D:** Both **Ostium Primum ASD** and **Complete AV Canal Defects** also present with an incomplete RBBB; however, they are characteristically associated with **Left Axis Deviation (LAD)** due to the superior displacement of the AV node and conduction system. * **Option B:** A **Sinus Venosus ASD** is often associated with a **leftward shift of the P-wave axis** (inverted P waves in inferior leads) because the sinoatrial node is often displaced or dysfunctional, but it does not typically present with the classic isolated incomplete RBBB/RAD pattern of a Secundum ASD. **3. High-Yield Clinical Pearls for NEET-PG:** * **Auscultation:** Look for a **fixed, wide split S2**—this is the most diagnostic physical sign of an ASD. * **ECG Shortcut:** * ASD + Right Axis Deviation = **Secundum ASD**. * ASD + Left Axis Deviation = **Primum ASD**. * **Radiology:** Chest X-ray typically shows "hilar dance" (increased pulmonary plethora) and right-sided heart enlargement [2]. * **Most Common Type:** Secundum ASD (75% of cases), located in the region of the fossa ovalis [1].
Question 1116: Severity of mitral stenosis is determined by which of the following?
- A. Intensity of S1 heart sound
- B. Diastolic murmur duration (Correct Answer)
- C. Opening snap
- D. Intensity of diastolic murmur
Explanation: In Mitral Stenosis (MS), the severity is primarily determined by the **duration of the diastolic murmur**, not its intensity. ### Why the Correct Answer is Right The hallmark of MS is a mid-diastolic rumbling murmur. As the mitral valve orifice narrows, the pressure gradient between the left atrium (LA) and left ventricle (LV) takes longer to equalize. In severe MS, the LA pressure remains significantly higher than the LV pressure throughout the entire diastole. Therefore, the **longer the duration** of the murmur (i.e., the closer it extends toward the first heart sound, S1), the more severe the stenosis. ### Why the Other Options are Incorrect * **Intensity of S1:** While S1 is loud in mild-to-moderate MS due to the mobile leaflets snapping shut, it actually becomes **soft or absent** in severe, calcified MS. Thus, intensity does not linearly correlate with severity. * **Opening Snap (OS):** The presence of an OS indicates mobile leaflets. However, severity is determined by the **A2-OS interval**, not the mere presence of the snap. A shorter A2-OS interval indicates higher LA pressure and more severe MS. * **Intensity of Diastolic Murmur:** The loudness of a murmur depends on the flow rate and pressure gradient. In very severe MS with low cardiac output, the murmur may actually become very soft ("Silent MS"). ### NEET-PG High-Yield Pearls * **Best indicator of MS severity:** Length of the diastolic murmur. * **A2-OS Interval:** Inversely proportional to severity (Shorter interval = Higher LA pressure = More severe MS). * **Loud S1 and OS:** Suggest the valve is still pliable and potentially suitable for Balloon Mitral Valvotomy (BMV). * **Critical MS:** Defined as a Mitral Valve Area (MVA) **< 1.0 cm²**.
Question 1117: A 67-year-old man with an 18-year history of type 2 diabetes mellitus presents for a routine physical examination. His temperature is 36.9 C (98.5 F), his blood pressure is 158/98 mm Hg and his pulse is 82/minute and regular. On examination, the physician notes a non tender, pulsatile, mass in the mid-abdomen. A plain abdominal x-ray film with the patient in the lateral position reveals spotty calcification of a markedly dilated abdominal aortic wall. Following surgery, the patient is placed on a low-fat diet to reduce the risk of continued progression of his atherosclerotic disease. A bile acid sequestrant is added to interrupt enterohepatic circulation of bile acids. Which of the following agents was MOST likely prescribed?
- A. Atorvastatin
- B. Cholestyramine (Correct Answer)
- C. Clofibrate
- D. Gemfibrozil
Explanation: ### Explanation The patient presents with an **Abdominal Aortic Aneurysm (AAA)**, evidenced by a pulsatile abdominal mass and calcified aortic dilation on X-ray [1]. The primary underlying pathology is **atherosclerosis**, driven by his long-standing diabetes and hypertension. Abdominal aortic aneurysms (AAAs) are present in 5% of men aged over 60 years and 80% are confined to the infrarenal segment [1]. **Why Cholestyramine is correct:** The question specifically asks for a **Bile Acid Sequestrant** that interrupts the **enterohepatic circulation**. * **Mechanism:** These agents (Cholestyramine, Colestipol, Colesevelam) are large, positively charged resins that bind to negatively charged bile acids in the small intestine. * **Effect:** This prevents bile acid reabsorption, forcing the liver to convert more endogenous cholesterol into new bile acids. This upregulates LDL receptors on hepatocytes, leading to a decrease in serum LDL-C levels. **Analysis of Incorrect Options:** * **A. Atorvastatin:** A HMG-CoA reductase inhibitor. While it is the first-line treatment for atherosclerosis, it works by inhibiting cholesterol synthesis in the liver, not by sequestering bile acids in the gut. * **C & D. Clofibrate and Gemfibrozil:** These are **Fibrates**. Their primary mechanism is the activation of **PPAR-̑**, which increases the activity of lipoprotein lipase (LPL) to primarily lower triglyceride levels. They do not interrupt enterohepatic circulation. **Clinical Pearls for NEET-PG:** 1. **Bile Acid Sequestrants (BAS):** These are the only lipid-lowering drugs that can actually **increase triglyceride levels**; therefore, they are contraindicated if baseline TG >300 mg/dL. 2. **Side Effects:** Most common are GI distress (bloating, constipation) and impaired absorption of fat-soluble vitamins (A, D, E, K) and drugs like Warfarin or Digoxin. 3. **AAA Screening:** The US preventive services task force recommends a one-time screening with ultrasound for men aged 65–75 who have ever smoked [1]. 4. **Drug of Choice:** While BAS are mentioned here, **Statins** remain the gold standard for mortality benefit in atherosclerotic cardiovascular disease [1].
Question 1118: In Mitral Valve Prolapse (MVP), which of the following conditions would cause the ejection click to be more accentuated and the murmur to move closer to the first heart sound?
- A. Marked anxiety (Correct Answer)
- B. Pregnancy
- C. Passive leg lifting in the supine position
- D. Administration of a beta-blocker
Explanation: **Explanation** The timing of the mid-systolic click and late systolic murmur in **Mitral Valve Prolapse (MVP)** is determined by the **Left Ventricular (LV) volume**. Any maneuver that **decreases LV volume** (decreased preload or decreased afterload) causes the redundant mitral valve leaflets to prolapse earlier into the left atrium during systole [1]. This results in the click and murmur moving **closer to the first heart sound (S1)**. **1. Why Marked Anxiety is Correct:** Anxiety leads to increased sympathetic activity (tachycardia) and decreased systemic vascular resistance. Tachycardia reduces diastolic filling time, thereby **decreasing LV end-diastolic volume**. This causes the valve to reach its prolapse point earlier in systole, making the click and murmur occur sooner (closer to S1) and often louder. **2. Why the Incorrect Options are Wrong:** * **Pregnancy & Passive Leg Lifting:** Both these conditions **increase venous return (preload)**. Increased LV volume distends the ventricle, delaying the prolapse of the leaflets. This moves the click and murmur **further from S1** (closer to S2). * **Beta-blockers:** These drugs decrease heart rate and increase diastolic filling time, thereby **increasing LV volume**. Similar to leg lifting, this delays the onset of the murmur and click. **Clinical Pearls for NEET-PG:** * **The Rule of Volume:** In MVP and HOCM, maneuvers that **decrease** LV volume (Standing, Valsalva Strain) make the murmur **louder/earlier**. Maneuvers that **increase** LV volume (Squatting, Leg Raise) make the murmur **softer/later**. * **Handgrip:** Increases afterload, which increases LV volume [2], thus delaying the murmur in MVP (unlike Mitral Regurgitation, where it gets louder). * **MVP Association:** Often associated with connective tissue disorders like Marfan Syndrome and Ehlers-Danlos Syndrome.
Question 1119: Which of the following findings is shown in the chest leads?
- A. Myocardial ischemia (Correct Answer)
- B. Myocardial injury
- C. Digoxin
- D. Digoxin toxicity
Explanation: ***Myocardial ischemia*** - Presents with **ST depression** and **T-wave inversions** in chest leads, indicating inadequate oxygen supply to myocardium. - Often seen during **stress testing** or **unstable angina**, representing reversible myocardial changes without necrosis. *Myocardial injury* - Characterized by **ST elevation** in chest leads, indicating more severe myocardial damage than ischemia. - Represents acute injury with potential for **myocardial necrosis** if not promptly treated. *Digoxin* - Shows characteristic **"reverse-tick" or "scooped" ST depression** in multiple leads, not specific to chest leads. - Associated with **shortened QT interval** and represents therapeutic digoxin effect, not pathological ischemia. *Digoxin toxicity* - Manifests primarily as **cardiac arrhythmias** like **atrial tachycardia with AV block** or **ventricular ectopy**. - ECG shows **increased automaticity** and **conduction blocks** rather than ischemic changes in chest leads.
Question 1120: Subvalvular aortic stenosis is known to be associated with all of the following, except:
- A. Aortic regurgitation
- B. Coarctation of aorta
- C. Tricuspid valve atresia (Correct Answer)
- D. Ventricular septal defect
Explanation: Subvalvular Aortic Stenosis (SAS) is a form of left ventricular outflow tract (LVOT) obstruction, most commonly caused by a discrete fibrous membrane or a fibromuscular tunnel. **Why Tricuspid Atresia is the Correct Answer:** Tricuspid Atresia is a cyanotic congenital heart disease characterized by the absence of the tricuspid valve. It is typically associated with a **hypoplastic right ventricle** and an atrial septal defect. It is **not** associated with subvalvular aortic stenosis. In fact, in cases of Tricuspid Atresia with transposed great arteries, the concern is often *subpulmonary* stenosis, not subaortic. **Analysis of Incorrect Options:** * **Aortic Regurgitation (AR):** This is a very common complication of SAS (seen in ~50-80% of cases). The high-velocity jet from the subvalvular obstruction causes "jet lesions" and chronic trauma to the aortic valve leaflets, leading to thickening and secondary AR. * **Coarctation of Aorta:** SAS is frequently part of a spectrum of left-sided obstructive lesions. It is often associated with Coarctation of the aorta and Shone’s complex (a series of left-sided obstructions). * **Ventricular Septal Defect (VSD):** SAS is frequently associated with other congenital anomalies, most notably VSD [1]. The altered hemodynamics of a VSD can sometimes trigger the proliferation of fibrous tissue in the LVOT. **NEET-PG High-Yield Pearls:** * **Shone’s Complex:** Includes parachute mitral valve, supravalvular mitral ring, subaortic stenosis, and coarctation of aorta. * **Clinical Feature:** Unlike valvular AS, the murmur of SAS is often heard best at the left sternal border, and an **expiratory click is typically absent**. * **Progression:** SAS is often progressive; even if the gradient is mild at birth, it tends to increase over time, necessitating serial echocardiography.
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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