Cardiology — MCQs
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Massive hemoptysis in mitral stenosis originates from which of the following structures?
A patient with prolonged immobilization in the Intensive Care Unit (ITU) developed sudden severe tricuspid regurgitation. What is the immediate management?
Beck's triad is a clinical feature of which of the following conditions?
A 62-year-old man with a history of hypertension presents with severe left chest and back pain. His blood pressure is 80/50 mm Hg. Physical examination reveals pallor, diaphoresis, and a murmur of aortic regurgitation. An ECG shows no myocardial infarction. A chest X-ray reveals mediastinal widening. Which of the following is the most likely diagnosis?
What is considered a tri-fascicular block?
A third heart sound is heard in all of the following conditions except:
Which of the following vessels is most commonly affected by atherosclerosis?
A 30-year-old male presents with a history of acute breathlessness. His JVP shows an inspiratory fall in blood pressure by 14 mmHg. What is true about this condition?
A 19-year-old male presents for a routine physical examination before playing for a college basketball team. He takes no medications and has no known allergies. His family history is notable for sudden cardiac death in his father and uncle around the age of 40. He is 195 cm tall and weighs 92 kg. On physical examination, he has pectus excavatum, arachnodactyly, and a high-arched palate. He wears glasses for severe myopia and has ectopia lentis on the right. A diastolic murmur is heard in the left third intercostal space. What advice should be given to him?
True regarding atrial fibrillation?
Cardiology Indian Medical PG Practice Questions and MCQs
Question 221: Massive hemoptysis in mitral stenosis originates from which of the following structures?
- A. Pulmonary veins (Correct Answer)
- B. Pulmonary artery
- C. Bronchial veins
- D. Bronchial artery
Explanation: **Explanation:** In Mitral Stenosis (MS), the narrowing of the mitral valve orifice leads to increased pressure in the Left Atrium (LA). This pressure is transmitted backward into the **Pulmonary Veins** and capillaries. The mechanism behind massive hemoptysis (historically termed **"Pulmonary Apoplexy"**) involves the collateral circulation between the pulmonary and bronchial venous systems. As pulmonary venous pressure rises, it causes retrograde congestion into the **bronchial veins**. These thin-walled submucosal bronchial veins become dilated and variceal. A sudden rise in left atrial pressure (often due to exertion or pregnancy) can cause these high-pressure varices to rupture into the bronchial lumen, resulting in profuse, bright red bleeding. **Analysis of Incorrect Options:** * **B. Pulmonary Artery:** While pulmonary arterial hypertension occurs in chronic MS, the arteries are thick-walled and do not typically rupture into the airways to cause massive hemoptysis. * **C. Bronchial Veins:** While these are the vessels that actually rupture, the *origin* of the pathology and the driving pressure is the **Pulmonary Venous system**. In the context of MS hemodynamics, "Pulmonary Veins" is the standard academic answer for the source of the pressure overload. * **D. Bronchial Artery:** This is the most common source of massive hemoptysis in conditions like **Bronchiectasis** or Tuberculosis, but not in Mitral Stenosis. **High-Yield Clinical Pearls for NEET-PG:** * **Pink Frothy Sputum:** Indicates acute pulmonary edema (rupture of alveolar capillaries), not massive hemoptysis. * **Rusty Sputum:** Seen in MS due to "heart failure cells" (hemosiderin-laden macrophages) in the alveoli. * **Ortner’s Syndrome:** Hoarseness of voice in MS due to compression of the Left Recurrent Laryngeal nerve by an enlarged Left Atrium.
Question 222: A patient with prolonged immobilization in the Intensive Care Unit (ITU) developed sudden severe tricuspid regurgitation. What is the immediate management?
- A. D-dimer assay
- B. Angiography
- C. IV heparin (Correct Answer)
- D. Recombinant tissue plasminogen activator (rtPA)
Explanation: ### Explanation **Concept: Acute Pulmonary Embolism (PE) and Right Heart Strain** The clinical scenario describes a patient with a high-risk factor (prolonged immobilization in the ITU) who develops sudden severe tricuspid regurgitation (TR). In this context, acute TR is a hallmark of **Acute Right Ventricular (RV) Failure** caused by a massive or sub-massive **Pulmonary Embolism**. The sudden increase in pulmonary artery pressure leads to RV dilation, which pulls the tricuspid valve leaflets apart (functional TR) [2]. Clinical features of massive PE include signs of right heart failure and RV hypertrophy and strain markers [3]. **1. Why IV Heparin is Correct:** In a patient with a high clinical suspicion of PE, the immediate management is **anticoagulation with IV Unfractionated Heparin (UFH)**. It prevents further clot propagation and allows the body’s endogenous fibrinolytic system to begin breaking down the existing thrombus. In the ITU setting, UFH is preferred over Low Molecular Weight Heparin (LMWH) due to its short half-life and easy reversibility if the patient requires urgent intervention. **2. Why Other Options are Incorrect:** * **A. D-dimer assay:** This has a high negative predictive value but is non-specific. In an ITU patient (post-surgery, trauma, or inflammation), D-dimer will likely be elevated regardless of PE, making it clinically useless here. * **B. Angiography:** While CT Pulmonary Angiography (CTPA) is the gold standard for diagnosis, the "immediate management" in a symptomatic patient is to start anticoagulation even before definitive imaging [1], provided there are no contraindications. * **C. rtPA (Thrombolysis):** This is reserved for **Massive PE** (defined by hemodynamic instability/hypotension). While the patient has severe TR, the question does not specify systemic hypotension. Thrombolysis is indicated in acute massive PE accompanied by cardiogenic shock; in the absence of shock, the benefits are less clear [2]. Anticoagulation is the first step unless the patient is in shock. **Clinical Pearls for NEET-PG:** * **McConnell’s Sign:** Specific echocardiographic finding in PE (RV free wall akinesia with sparing of the apex). * **S1Q3T3 Pattern:** Classic but non-specific ECG finding (Deep S in Lead I, Q wave and inverted T in Lead III) [3]. * **Gold Standard Diagnosis:** CT Pulmonary Angiography (CTPA) [1]. * **Treatment of Choice for Hemodynamic Instability:** Systemic Thrombolysis (rtPA) [2].
Question 223: Beck's triad is a clinical feature of which of the following conditions?
- A. Constrictive pericarditis
- B. Cardiac tamponade (Correct Answer)
- C. Pulmonary embolism
- D. Acute bronchial asthma
Explanation: **Explanation:** **Beck’s Triad** is a classic clinical sign pathognomonic for **Cardiac Tamponade**. It occurs when fluid accumulates in the pericardial sac under high pressure, compressing the heart chambers and preventing adequate diastolic filling [1]. This leads to the three components of the triad: 1. **Hypotension:** Due to decreased stroke volume and cardiac output. 2. **Jugular Venous Distension (JVD):** Due to impaired venous return to the right atrium. 3. **Muffled Heart Sounds:** Due to the insulating effect of the pericardial fluid. **Analysis of Incorrect Options:** * **A. Constrictive Pericarditis:** While it presents with JVD and signs of right heart failure, it is characterized by the **Kussmaul sign** (paradoxical rise in JVP on inspiration) and a **pericardial knock** [2], rather than the acute hypotension seen in Beck's triad. * **C. Pulmonary Embolism:** Presents with sudden onset dyspnea, pleuritic chest pain, and tachycardia. While severe cases (Saddle PE) cause hypotension and JVD, heart sounds remain clear. * **D. Acute Bronchial Asthma:** Characterized by expiratory wheezing and prolonged expiration. While it can cause **Pulsus Paradoxus**, it does not present with the components of Beck's triad. **High-Yield Clinical Pearls for NEET-PG:** * **Pulsus Paradoxus:** Defined as a drop in systolic BP >10 mmHg during inspiration. It is a key finding in Tamponade but is *absent* in Constrictive Pericarditis (except in rare cases). * **ECHO Findings:** The gold standard for diagnosis; look for **diastolic collapse** of the right ventricle and right atrium [1]. * **ECG Findings:** Look for **Electrical Alternans** (varying QRS amplitude) and low-voltage complexes [1]. * **Management:** The immediate treatment of choice is **emergency pericardiocentesis** [1].
Question 224: A 62-year-old man with a history of hypertension presents with severe left chest and back pain. His blood pressure is 80/50 mm Hg. Physical examination reveals pallor, diaphoresis, and a murmur of aortic regurgitation. An ECG shows no myocardial infarction. A chest X-ray reveals mediastinal widening. Which of the following is the most likely diagnosis?
- A. Bacterial endocarditis
- B. Dissecting aneurysm (Correct Answer)
- C. Pericarditis
- D. Pulmonary thromboembolism
Explanation: The clinical presentation of sudden-onset, severe chest and back pain (often described as "tearing") in a hypertensive patient, coupled with **mediastinal widening** on chest X-ray, is classic for **Aortic Dissection (Dissecting Aneurysm)** [1]. The presence of **hypotension (80/50 mm Hg)** and a **murmur of aortic regurgitation** suggests a Stanford Type A dissection involving the ascending aorta [1]. Hypotension in this context is a surgical emergency, often indicating complications like cardiac tamponade, severe aortic insufficiency, or rupture. The absence of MI changes on ECG helps rule out a primary coronary event, although dissection can occasionally involve the coronary ostia. **Why other options are incorrect:** * **Bacterial Endocarditis:** Typically presents with fever, weight loss, and peripheral stigmata (Janeway lesions, Osler nodes). While it causes murmurs, it does not cause acute "tearing" back pain or mediastinal widening. * **Pericarditis:** Characterized by pleuritic chest pain that improves upon leaning forward. ECG would typically show diffuse ST-segment elevation and PR depression, not mediastinal widening. * **Pulmonary Thromboembolism:** Presents with dyspnea, pleuritic chest pain, and tachycardia. While it can cause hypotension (Massive PE), it does not cause a new aortic regurgitation murmur or mediastinal widening. **High-Yield Pearls for NEET-PG:** * **Risk Factors:** Hypertension (most common), Marfan syndrome, and Bicuspid aortic valve [1]. * **Gold Standard Investigation:** CT Angiography (stable patients) or Transesophageal Echocardiogram (unstable patients) [1]. * **Management:** Type A (Ascending) requires **emergency surgery**; Type B (Descending) is generally managed **medically** with IV beta-blockers (Labetalol) to reduce heart rate and shear stress (dP/dt).
Question 225: What is considered a tri-fascicular block?
- A. Left Anterior hemi block (LAH) and Left Posterior hemi block (LPH)
- B. Right Bundle Branch Block (RBBB) and Left Anterior hemi block (LAH)
- C. Right Bundle Branch Block (RBBB) and Left Posterior hemi block (PAH)
- D. None of the above (Correct Answer)
Explanation: ### **Explanation** The term **Trifascicular Block** is often misunderstood. In clinical practice and for NEET-PG, it refers to a condition where all three conduction pathways of the ventricles are affected. **Why "None of the above" is correct:** A true trifascicular block consists of a **Bifascicular block PLUS a 1st-degree AV block**. The three fascicles involved are: 1. Right Bundle Branch (RBB) 2. Left Anterior Fascicle (LAF) 3. Left Posterior Fascicle (LPF) **Analysis of Options:** * **Option A:** LAH + LPH is equivalent to a **Left Bundle Branch Block (LBBB)**, as both fascicles of the left side are blocked [2]. * **Options B & C:** These represent **Bifascicular Blocks** [2]. * RBBB + LAH = Bifascicular block. * RBBB + LPH = Bifascicular block. To make these "trifascicular," an additional delay in the remaining fascicle (manifesting as a prolonged PR interval/1st-degree AV block) must be present. **Clinical Pearls for NEET-PG:** 1. **Bifascicular Block:** The most common pattern is **RBBB + Left Anterior Hemiblock (LAHB)** because the anterior fascicle is thin and has a single blood supply (LAD) [2]. 2. **RBBB + Left Posterior Hemiblock (LPHB):** This is rarer and more concerning, as the posterior fascicle is thick and has a dual blood supply (RCA and LCX). Its presence suggests extensive conduction system disease. 3. **Management:** Asymptomatic trifascicular block generally does not require a pacemaker [1]. However, if it progresses to **Complete Heart Block (3rd-degree AV block)** or causes syncope, a permanent pacemaker (PPI) is indicated [1]. 4. **Alternating Bundle Branch Block:** (RBBB and LBBB appearing at different times) is also considered a form of trifascicular block and is a high-risk sign for sudden cardiac arrest.
Question 226: A third heart sound is heard in all of the following conditions except:
- A. Athletes
- B. Mitral stenosis (Correct Answer)
- C. Constrictive pericarditis
- D. Myocardial infarction
Explanation: Explanation: The **Third Heart Sound (S3)**, also known as a ventricular gallop, occurs during the early phase of diastole (rapid ventricular filling). It is caused by the sudden deceleration of blood flow into a dilated or non-compliant ventricle. **Why Mitral Stenosis is the Correct Answer:** In **Mitral Stenosis (MS)**, the mitral valve is narrowed, which physically obstructs the flow of blood from the left atrium to the left ventricle [2]. Because the rate of ventricular filling is significantly slowed and restricted, the rapid filling phase required to produce an S3 does not occur. Instead, MS is characterized by an **Opening Snap (OS)** and a mid-diastolic murmur [1][2]. **Analysis of Incorrect Options:** * **Athletes:** S3 is a normal physiological finding in children, young adults, and well-trained athletes due to high cardiac output and rapid ventricular filling in a healthy, compliant heart. * **Constrictive Pericarditis:** This condition produces a variant of S3 known as a **Pericardial Knock**. It occurs when the rigid pericardium abruptly halts early diastolic filling. * **Myocardial Infarction:** In the setting of an MI, ventricular wall motion abnormality or acute heart failure leads to increased end-systolic volume and decreased compliance, making the S3 a classic sign of left ventricular dysfunction. **High-Yield Clinical Pearls for NEET-PG:** * **S3 vs. S4:** S3 occurs during *early* diastole (rapid filling); S4 occurs during *late* diastole (atrial contraction). * **The "Kentucky" Gallop:** S3 is best heard with the bell of the stethoscope at the apex in the left lateral decubitus position. * **Pathological S3:** In adults over age 40, an S3 is usually the first clinical sign of **congestive heart failure**. * **Rule of Thumb:** S3 is associated with **volume overload** (e.g., MR, AR, VSD), whereas S4 is associated with **pressure overload/stiff ventricles** (e.g., AS, Hypertension).
Question 227: Which of the following vessels is most commonly affected by atherosclerosis?
- A. Left Circumflex Artery (LCX)
- B. Left Anterior Descending Artery (LAD) (Correct Answer)
- C. Right Coronary Artery (RCA)
- D. Diagonal branch of LAD
Explanation: Atherosclerosis is a chronic inflammatory process characterized by the deposition of lipids and fibrous tissue within the arterial walls. In the coronary circulation, the distribution of these lesions is not random; it is heavily influenced by hemodynamic factors such as shear stress and turbulence, which occur most frequently at arterial branch points and bifurcations [1]. **Why the Left Anterior Descending Artery (LAD) is correct:** The **LAD is the most common site** for clinically significant coronary atherosclerosis. This is primarily due to its anatomical course and the high-pressure flow it receives as the direct continuation of the Left Main Coronary Artery. It supplies the majority of the left ventricular apex and the anterior wall, making it the most critical vessel in the heart—often referred to as the **"Widow Maker"** when acutely occluded. **Analysis of Incorrect Options:** * **Right Coronary Artery (RCA):** This is the second most common site for atherosclerosis. While it is frequently involved, the frequency of significant stenosis is statistically lower than that of the LAD. * **Left Circumflex Artery (LCX):** This is the third most common site. It typically follows the LAD and RCA in terms of atherosclerotic burden. * **Diagonal branch of LAD:** While branches are common sites for plaque formation due to turbulence at the ostia, the main trunk of the LAD is more frequently and severely affected than its individual branches. **NEET-PG High-Yield Pearls:** 1. **Order of involvement in Coronary Arteries:** LAD > RCA > LCX. 2. **Order of involvement in Systemic Arteries:** Abdominal Aorta > Coronary Arteries > Popliteal Arteries > Internal Carotid > Circle of Willis. 3. **Location:** Atherosclerosis typically affects the **proximal 2 cm** of the epicardial coronary arteries. 4. **Risk Factors:** Hypertension, Diabetes Mellitus, and Smoking are the most potent modifiable risk factors for accelerating this process [1].
Question 228: A 30-year-old male presents with a history of acute breathlessness. His JVP shows an inspiratory fall in blood pressure by 14 mmHg. What is true about this condition?
- A. Kussmaul sign
- B. Pulsus paradoxus (Correct Answer)
- C. Rapidly descending pulse
- D. An inspiratory fall of systemic blood pressure of more than 10 mmHg
Explanation: ### Explanation **1. Understanding the Correct Answer: Pulsus Paradoxus** The clinical scenario describes an **inspiratory fall in systolic blood pressure of 14 mmHg**. By definition, **Pulsus Paradoxus** is an exaggeration of the normal physiological decline in systolic blood pressure during inspiration, specifically a drop of **>10 mmHg**. **Mechanism:** During inspiration, increased venous return to the right ventricle (RV) causes the interventricular septum to bulge toward the left ventricle (LV). This reduces LV filling (preload) and stroke volume, leading to a drop in systemic blood pressure. In conditions like **Cardiac Tamponade** [1] (the classic cause), this effect is exaggerated because the heart is confined within a non-distensible pericardial sac. **2. Analysis of Incorrect Options:** * **Option A (Kussmaul Sign):** This refers to a paradoxical **rise** in JVP during inspiration. It is typically seen in Constrictive Pericarditis and Right Ventricular Infarction, but notably **absent** in Cardiac Tamponade. * **Option C (Rapidly descending pulse):** Also known as a "Water-hammer pulse," this is characteristic of Aortic Regurgitation or high-output states, not acute breathlessness with inspiratory BP changes. * **Option D (An inspiratory fall...):** While this statement is a correct *definition* of Pulsus Paradoxus, the question asks "What is true about this condition?" where the condition itself is the diagnosis. In NEET-PG, identifying the clinical sign (Pulsus Paradoxus) takes precedence over its definition when both are provided. **3. High-Yield Clinical Pearls for NEET-PG:** * **Classic Causes of Pulsus Paradoxus:** Cardiac Tamponade [1], Severe Asthma/COPD [2], and Constrictive Pericarditis (rarely). * **Reverse Pulsus Paradoxus:** Seen in Hypertrophic Obstructive Cardiomyopathy (HOCM). * **Beck’s Triad (Cardiac Tamponade):** Hypotension, JVP distension, and Muffled heart sounds [1]. * **Total Paradox:** When the peripheral pulse completely disappears during inspiration (severe Tamponade).
Question 229: A 19-year-old male presents for a routine physical examination before playing for a college basketball team. He takes no medications and has no known allergies. His family history is notable for sudden cardiac death in his father and uncle around the age of 40. He is 195 cm tall and weighs 92 kg. On physical examination, he has pectus excavatum, arachnodactyly, and a high-arched palate. He wears glasses for severe myopia and has ectopia lentis on the right. A diastolic murmur is heard in the left third intercostal space. What advice should be given to him?
- A. He is not safe for further competitive basketball or other strenuous physical activities. (Correct Answer)
- B. He is safe to resume physical activity without further evaluation.
- C. He may continue to practice with the team while further evaluation with an echocardiogram, slit lamp examination, and genetic testing is performed.
- D. He should be placed on a beta-blocker and then can resume physical activity.
Explanation: ### Explanation **1. Why Option A is Correct:** The clinical presentation—tall stature, pectus excavatum, arachnodactyly, high-arched palate, and **ectopia lentis** (dislocation of the lens)—is classic for **Marfan Syndrome**, an autosomal dominant disorder of connective tissue caused by a mutation in the **FBN1 gene** (Fibrillin-1) [1]. The presence of a **diastolic murmur** at the left third intercostal space (Erb’s point) suggests **aortic regurgitation**, likely secondary to **aortic root dilation** or dissection [2]. In patients with Marfan syndrome, strenuous physical activity and competitive sports (especially high-intensity/collision sports like basketball) significantly increase the risk of **aortic dissection or rupture** due to increased wall stress. According to the Bethesda criteria and AHA/ACC guidelines, any patient with Marfan syndrome and evidence of aortic root dilation or a family history of sudden death must be restricted from competitive sports [1]. **2. Why Other Options are Incorrect:** * **Option B:** Ignoring the physical findings and family history of sudden cardiac death (SCD) is dangerous and constitutes medical negligence. * **Option C:** While an echocardiogram and genetic testing are necessary for diagnosis, the patient must be restricted from strenuous activity **immediately** upon suspicion, especially given the presence of a murmur and a positive family history. * **Option D:** Beta-blockers are the mainstay of treatment to slow aortic root dilation, but they do not eliminate the risk of dissection during high-intensity sports. Pharmacotherapy does not "clear" a Marfan patient for competitive basketball. **3. NEET-PG High-Yield Pearls:** * **Ghent Criteria:** Used for diagnosing Marfan Syndrome (focuses on aortic root Z-score, ectopia lentis, FBN1 mutation, and systemic score). * **Most common cause of death:** Aortic root dissection/rupture. * **Cardiac findings:** Mitral Valve Prolapse (most common valvular abnormality) and Aortic Root Dilatation [2]. * **Ectopia Lentis:** In Marfan, the lens typically dislocates **upward and outward** (superior-temporal), unlike Homocystinuria where it dislocates downward.
Question 230: True regarding atrial fibrillation?
- A. Increased thromboembolism
- B. Digoxin treatment (Correct Answer)
- C. Anticoagulant not required
- D. Aspirin given
Explanation: Atrial Fibrillation (AF) is a common supraventricular tachyarrhythmia characterized by rapid, irregular atrial activation [1]. **Why Option B is Correct:** **Digoxin** is a classic pharmacological agent used in AF for **rate control**. It works by increasing vagal tone, which slows conduction through the Atrioventricular (AV) node, thereby reducing the ventricular rate [1]. While beta-blockers and calcium channel blockers are now first-line for active patients, Digoxin remains a preferred choice in patients with concomitant **Heart Failure** or those with sedentary lifestyles [1]. **Why the other options are incorrect:** * **Option A (Increased thromboembolism):** While AF *does* significantly increase the risk of thromboembolism (due to blood stasis in the left atrial appendage), the question asks for a "True" statement regarding management/nature [1]. In the context of standard NEET-PG MCQ patterns, if a specific treatment like Digoxin is marked correct, it refers to the standard therapeutic approach. (Note: In some contexts, A could be considered factually true, but B is the definitive clinical management answer provided). * **Option C (Anticoagulant not required):** This is **False**. Anticoagulation is the cornerstone of AF management to prevent stroke, guided by the **CHA₂DS₂-VASc score** [1]. * **Option D (Aspirin given):** This is **False/Obsolete**. Current guidelines (ESC/AHA) have moved away from Aspirin for stroke prevention in AF, as it is significantly less effective than oral anticoagulants (Warfarin or NOACs) and still carries a bleeding risk. **High-Yield Clinical Pearls for NEET-PG:** * **ECG Hallmark:** "Irregularly irregular" rhythm with absent P-waves and presence of fibrillatory (f) waves. * **Treatment Goals:** 1. Rate control (Beta-blockers, CCBs, Digoxin), 2. Rhythm control (Amiodarone, Flecainide, Cardioversion), and 3. Anticoagulation [1]. * **Drug of Choice for AF with WPW Syndrome:** Procainamide (Avoid Digoxin/CCBs as they can paradoxically increase ventricular rate) [1]. * **Most common site of thrombus:** Left Atrial Appendage [1].
Practice by Chapter
Coronary Artery Disease and Angina
Practice Questions
Acute Coronary Syndromes
Practice Questions
Heart Failure
Practice Questions
Cardiac Arrhythmias
Practice Questions
Valvular Heart Diseases
Practice Questions
Cardiomyopathies
Practice Questions
Pericardial Diseases
Practice Questions
Congenital Heart Disease in Adults
Practice Questions
Hypertension and Hypertensive Emergencies
Practice Questions
Pulmonary Hypertension
Practice Questions
Non-invasive Cardiac Diagnostics
Practice Questions
Preventive Cardiology
Practice Questions
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