Cardiology — MCQs

Cardiology Indian Medical PG Practice Questions and MCQs

Question 1371: A 55-year-old patient with cyanosis and a history of atrial fibrillation is at increased risk for which of the following complications?

A. Hypercalcemia
B. Hypovolemic shock
C. Thromboembolism (Correct Answer)
D. Pulmonary edema

Explanation: ***Thromboembolism*** - **Atrial fibrillation** causes irregular and often rapid heart rates, leading to inefficient atrial emptying and **blood stasis** within the atria [1]. - This stasis promotes **clot formation**, and these clots can dislodge and travel to other parts of the body, causing **thromboembolic events** like stroke or peripheral arterial occlusion [1]. *Hypercalcemia* - **Hypercalcemia** is an elevated calcium level in the blood, typically associated with **parathyroid disorders** or malignancies. - It does not have a direct causal link to atrial fibrillation or cyanosis. *Hypovolemic shock* - **Hypovolemic shock** is a life-threatening condition resulting from **severe blood or fluid loss**, leading to inadequate organ perfusion. - While patients with heart conditions can experience various shocks, hypovolemic shock is not a direct consequence of atrial fibrillation or cyanosis. *Pulmonary edema* - **Pulmonary edema** is characterized by fluid accumulation in the lungs, often due to **heart failure** or acute respiratory distress syndrome. - While atrial fibrillation can contribute to heart failure, pulmonary edema is a *symptom* of severe heart dysfunction rather than a primary complication of atrial fibrillation in the context of increased embolic risk [2].

Question 1372: A 40F with progressive exertional dyspnea and cyanosis. Physical examination reveals digital clubbing and a loud P2 heart sound. Most appropriate next step in diagnosis?

A. Echocardiography (Correct Answer)
B. Pulmonary function test
C. Chest X-ray
D. Electrocardiogram

Explanation: ***Echocardiography*** - The presence of **exertional dyspnea**, **cyanosis**, **digital clubbing**, and a **loud P2 heart sound** strongly suggests pulmonary hypertension [1]. - An **echocardiogram** is crucial for directly visualizing the heart chambers and great vessels, allowing for the estimation of **pulmonary artery pressures** and assessing right ventricular function, which is key in diagnosing and evaluating **pulmonary hypertension** [1]. *Pulmonary function test* - While pulmonary function tests (PFTs) assess lung mechanics and volumes, they primarily help diagnose **obstructive** or **restrictive lung diseases**. - PFTs do not directly measure **pulmonary artery pressures** or assess cardiac structure, which are central to the patient's presentation. *Chest X-ray* - A chest X-ray can show signs of **pulmonary hypertension** such as **enlarged pulmonary arteries** or **cardiomegaly** [1], [2]. - However, it provides limited information regarding cardiac function and **pulmonary artery pressures** and is less specific than an echocardiogram for initial diagnosis [1]. *Electrocardiogram* - An ECG can detect signs of **right ventricular hypertrophy** or **right axis deviation**, which may be present in **pulmonary hypertension** [2]. - However, it offers no direct information on **pulmonary artery pressures** or structural abnormalities of the heart chambers.

Question 1373: A 30-year-old woman presents with shortness of breath, cyanosis, and a loud S2 sound on auscultation. Which of the following is the most likely diagnosis?

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

Explanation: ***Pulmonary hypertension*** - **Shortness of breath** and **cyanosis** indicate severe **hypoxia** and **reduced cardiac output**, which are hallmarks of high **pulmonary artery pressure**. [1] - A **loud S2** results from increased pressure in the pulmonary artery causing a forceful closure of the **pulmonic valve**. *Aortic regurgitation* - Characterized by a **diastolic murmur** and **bounding peripheral pulses**; **cyanosis** and a loud S2 are not typical features. - Patients often present with **dyspnea on exertion**, but not usually with prominent **cyanosis** unless heart failure is very advanced. *Mitral stenosis* - Typically presents with **dyspnea**, **cough**, and a **loud S1**, along with a **diastolic rumble** at the apex. - While it can lead to **pulmonary hypertension**, a loud S2 alone in the absence of a characteristic murmur does not make it the primary diagnosis. *Pericarditis* - Presents with sharp, pleuritic **chest pain** that improves with leaning forward, and often includes a **pericardial friction rub**. - **Shortness of breath** may occur due to pain or tamponade, but **cyanosis** and a loud S2 are not characteristic features of uncomplicated pericarditis.

Question 1374: A 45-year-old woman presents with clubbing and cyanosis. Chest X-ray shows a prominent pulmonary artery. Which congenital heart disease should be considered?

A. Patent ductus arteriosus (PDA) with Eisenmenger syndrome.
B. Atrial septal defect (ASD) with Eisenmenger syndrome. (Correct Answer)
C. Tetralogy of Fallot
D. Pulmonary stenosis (PS)

Explanation: Atrial septal defect (ASD) with Eisenmenger syndrome. - Clubbing, cyanosis, and a prominent pulmonary artery in a 45-year-old suggest long-standing pulmonary hypertension with shunt reversal, characteristic of Eisenmenger syndrome [1]. - An ASD is a common congenital heart defect that can lead to significant left-to-right shunting, eventually causing pulmonary hypertension [1]. and reversed shunt flow (Eisenmenger syndrome) over decades [2]. *Patent ductus arteriosus (PDA) with Eisenmenger syndrome.* - While PDA can also lead to Eisenmenger syndrome, it typically presents with a continuous murmur and often causes symptoms earlier in life if the shunt is large. - The patient's age and the specific features presented are more classic for an ASD progressing to Eisenmenger syndrome. *Tetralogy of Fallot* - This is a cyanotic congenital heart disease from birth or early childhood, commonly presenting with cyanosis and "tet spells" [3]. - While it causes cyanosis, a prominent pulmonary artery is not a typical feature; instead, there is often reduced pulmonary blood flow and a small pulmonary artery due to pulmonary outflow obstruction [3]. *Pulmonary stenosis (PS)* - Pulmonary stenosis primarily causes obstruction to blood flow out of the right ventricle, leading to right ventricular hypertrophy and potentially a systolic murmur. - While severe PS can cause cyanosis due to a right-to-left shunt through an ASD (if present), isolated PS is typically acyanotic and does not usually present with a prominent pulmonary artery or clubbing unless it's very severe and associated with other defects.

Question 1375: A 34-year-old man with a 5-year history of chronic lower back pain and morning stiffness presents with exertional dyspnea. Physical examination reveals reduced spinal mobility and a diastolic murmur. Echocardiography confirms aortic regurgitation. What is the most likely underlying condition?

A. Ankylosing spondylitis
B. Rheumatic fever (Correct Answer)
C. Bicuspid aortic valve
D. Marfan syndrome

Explanation: ***Ankylosing spondylitis*** - Aortic regurgitation can occur as a complication of **ankylosing spondylitis**, often due to **aortitis** affecting the aortic valve. - This condition is associated with **HLA-B27 positivity** and can cause progressive spinal changes. *Rheumatic fever* - Predominantly causes **mitral and aortic valve stenosis** rather than regurgitation due to scarring after infection. - Typically presents with a history of **recent streptococcal throat infection**, which is not indicated here. *Marfan syndrome* - Classically leads to **aortic dilation and regurgitation**, but is not the most common underlying condition linked with regurgitation in this scenario [1]. - It is characterized by **tall stature** and **hyperflexible joints**, which are absent in this case [1]. *Syphilis* - Can cause **aortic regurgitation**, particularly in late stages, due to **aortitis**, but is less common than ankylosing spondylitis as an underlying condition. - Usually presents with additional findings such as **cardiovascular syphilis** or other systemic signs not mentioned in this question.

Question 1376: Which of the following is the most specific marker for detecting myocardial infarction?

A. CK-MB
B. Troponin I (Correct Answer)
C. LDH
D. Myoglobin

Explanation: ***Troponin I*** - **Cardiac troponin I** is highly specific to myocardial tissue and is released into the bloodstream following myocardial injury. [2] - It remains elevated for an extended period (up to 7-10 days), making it useful for later diagnosis as well. *CK-MB* - While CK-MB is found in cardiac muscle and can rise after myocardial infarction, it is **less specific** than troponin. [2] - CK-MB can also be elevated in conditions involving skeletal muscle damage, such as **rhabdomyolysis** or strenuous exercise. *LDH* - **Lactate dehydrogenase (LDH)** is a non-specific enzyme found in various tissues throughout the body, including the heart, liver, and red blood cells. [1] - Its elevation often indicates general tissue damage rather than specific myocardial injury. [1] *Myoglobin* - **Myoglobin** is one of the earliest markers to rise after myocardial injury due to its small size and rapid release. - However, it lacks cardiac specificity as it is also present in skeletal muscle, leading to false positives in cases of skeletal muscle injury.

Question 1377: An elderly man with a prosthetic heart valve presents with fever and a new heart murmur. Blood cultures grow gram-positive cocci in chains. What is the recommended management for this patient regarding valve replacement and antibiotic therapy?

A. Antibiotic therapy alone with penicillin. (Correct Answer)
B. Valve monitoring with ceftriaxone.
C. Anticoagulation therapy with heparin.
D. Immediate valve replacement and vancomycin therapy.

Explanation: The likely diagnosis is infective endocarditis caused by **Streptococcus viridans**, a common pathogen for **subacute endocarditis** on prosthetic valves [1]. Initial management typically involves empirical antibiotic therapy, and given the gram-positive cocci in chains and the clinical context, **high-dose penicillin** is often the preferred initial treatment for susceptible organisms [2]. While **ceftriaxone** is a broad-spectrum antibiotic, it is not the primary choice for suspected **Streptococcus viridans** endocarditis if penicillin-sensitive. **Valve monitoring alone** is insufficient, as active infection requires aggressive antibiotic treatment to prevent complications. **Anticoagulation** is not a primary treatment for infective endocarditis and can increase the risk of **hemorrhagic complications**, especially if there are vegetations or systemic embolization [3]. It does not address the underlying bacterial infection. **Immediate valve replacement** is generally reserved for cases with severe valvular dysfunction, large vegetations, recurrent emboli, or persistent infection despite adequate antibiotics [3]. While **vancomycin** is appropriate for methicillin-resistant bacteria, **penicillin** is preferred for penicillin-susceptible streptococci due to its efficacy and lower toxicity profile.

Question 1378: A 50-year-old woman with a history of breast cancer treated with radiation presents with shortness of breath and fatigue. Her echocardiogram shows a thickened pericardium and diastolic dysfunction. What is the most likely diagnosis?

A. Constrictive pericarditis (Correct Answer)
B. Dilated cardiomyopathy
C. Restrictive cardiomyopathy
D. Hypertrophic cardiomyopathy

Explanation: ***Constrictive pericarditis*** - The history of **radiation therapy** to the chest and echocardiogram findings of a **thickened pericardium** with **diastolic dysfunction** are classic for constrictive pericarditis [1]. - **Shortness of breath** and **fatigue** are common symptoms due to impaired ventricular filling and reduced cardiac output [1], [3]. *Dilated cardiomyopathy* - Characterized by **ventricular dilation** and **systolic dysfunction**, which are not indicated by the thickened pericardium or preserved systolic function in this case. - While it can cause shortness of breath and fatigue, the echocardiogram findings point away from this diagnosis. *Restrictive cardiomyopathy* - Involves **stiff, noncompliant ventricles** leading to diastolic dysfunction, similar to constrictive pericarditis in some regards [2]. - However, the underlying pathology for restrictive cardiomyopathy is myocardial infiltration or fibrosis, and typically does not involve a **thickened pericardium** as the primary finding [2]. *Hypertrophic cardiomyopathy* - Characterized by **ventricular hypertrophy** (thickening of the heart muscle), often asymmetrical, leading to diastolic dysfunction [2]. - There is no mention of ventricular hypertrophy, and the thickened pericardium points to an extrinsic cause rather than intrinsic myocardial disease [4].

Question 1379: A synchronous cardioversion is indicated in which of the following arrhythmias?

A. Ventricular fibrillation
B. Unstable ventricular tachycardia (Correct Answer)
C. Atrial flutter
D. Atrial fibrillation

Explanation: ***Unstable ventricular tachycardia*** - Synchronous cardioversion is indicated in **unstable ventricular tachycardia (VT)** because the heart still has organized electrical activity, but it's rapid and ineffective, leading to hemodynamic instability [1], [2]. - Synchronization prevents the electrical shock from being delivered during the vulnerable T-wave repolarization, which could induce **ventricular fibrillation** [1]. *Ventricular fibrillation* - Ventricular fibrillation is characterized by **chaotic, disorganized electrical activity** in the ventricles, preventing effective cardiac output [1], [3]. - Due to the lack of organized QRS complexes, **defibrillation (unsynchronized shock)** is the appropriate treatment, as there's no R-wave to synchronize with [3]. *Atrial flutter* - While atrial flutter can sometimes be treated with synchronized cardioversion if it causes hemodynamic instability, it is generally **less urgent** than unstable VT. - The primary indications for cardioversion in atrial flutter are drug-refractory cases or those causing **significant symptoms** or rapid ventricular rates. *Atrial fibrillation* - Synchronous cardioversion can be used for atrial fibrillation, especially if it's **new onset** or causing hemodynamic instability [4]. - However, in hemodynamically stable atrial fibrillation, **rate control** and **anticoagulation** are often the initial management strategies, and cardioversion is not immediately indicated for all cases.

Question 1380: In a patient with essential hypertension, what is the target blood pressure according to the most recent guidelines?

A. Below 140/90 mmHg
B. Below 130/80 mmHg (Correct Answer)
C. Below 120/80 mmHg
D. Below 150/90 mmHg

Explanation: ***Below 130/80 mmHg*** - Current guidelines from organizations like the **American College of Cardiology (ACC)** and the **American Heart Association (AHA)** recommend a target blood pressure of **less than 130/80 mmHg** for most adults with essential hypertension. - This target is associated with a reduction in cardiovascular events and all-cause mortality, especially in patients with a higher risk of **atherosclerotic cardiovascular disease (ASCVD)**. [1] *Below 140/90 mmHg* - This was a previous target for many hypertensive patients but has been revised to often be stricter to achieve better cardiovascular outcomes. - While it may still be adequate for very low-risk individuals or those with significant comorbidities where lower targets are unsafe, it's not the general target according to recent guidelines. *Below 120/80 mmHg* - A blood pressure of **120/80 mmHg** is considered **normal** or optimal, but aggressively targeting below this in all hypertensive patients may increase the risk of **adverse events** like syncope or renal dysfunction without significant additional benefit. - This target is not universally recommended for treatment of essential hypertension; rather, it is a healthy goal for the general population. *Below 150/90 mmHg* - This target is generally considered too high for most adults with essential hypertension and would not adequately reduce their risk of cardiovascular complications. - It might be considered for specific elderly populations where aggressive treatment carries more risks than benefits, but it is not the general recommendation.

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Coronary Artery Disease and Angina

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Acute Coronary Syndromes

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Heart Failure

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Cardiac Arrhythmias

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Valvular Heart Diseases

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Cardiomyopathies

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Pericardial Diseases

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Congenital Heart Disease in Adults

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Hypertension and Hypertensive Emergencies

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Pulmonary Hypertension

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Non-invasive Cardiac Diagnostics

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Preventive Cardiology

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Cardiology — MCQs

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