Cardiology — MCQs

Cardiology Indian Medical PG Practice Questions and MCQs

Question 1401: A patient with a mechanical heart valve in the aortic position and a history of gastrointestinal bleeding requires anticoagulation. What is the best strategy?

A. Warfarin with proton pump inhibitor (Correct Answer)
B. Warfarin with a standard INR target
C. Switch to a different anticoagulant
D. Stop anticoagulation therapy

Explanation: Warfarin with proton pump inhibitor - **Warfarin** is essential for patients with **mechanical heart valves** to prevent thrombotic complications [2]. - The addition of a **proton pump inhibitor (PPI)** reduces the risk of **gastrointestinal bleeding**, which is a significant concern for anticoagulated patients with a history of GI bleeding. Warfarin with a standard INR target - While **warfarin** is appropriate for the mechanical valve, a **standard INR target** may not sufficiently mitigate the risk of recurrent GI bleeding in a patient with a history of such events [1]. - A more nuanced approach, such as adding a PPI, is often required to balance the benefits of anticoagulation against the bleeding risk. Switch to a different anticoagulant - **Direct oral anticoagulants (DOACs)** are generally **contraindicated** for patients with **mechanical heart valves** due to increased thrombotic risk. - There is currently no other anticoagulant proven to be as effective and safe as warfarin for mechanical heart valves [2]. Stop anticoagulation therapy - **Stopping anticoagulation** in a patient with a **mechanical aortic valve** would lead to a very high risk of **thrombosis**, **stroke**, and potentially **valve dysfunction** [2]. - The risk of major thrombotic events far outweighs the bleeding risk in this scenario, making cessation of therapy unsafe.

Question 1402: A 58-year-old man presents with chest pain and sweating. His ECG shows ST elevation in leads II, III, and aVF. What is the most likely location of the myocardial infarction?

A. Anterior wall
B. Posterior wall
C. Inferior wall (Correct Answer)
D. Lateral wall

Explanation: Detailed Analysis: ***Inferior wall*** - **ST elevation** in leads **II, III, and aVF** is the classic electrocardiographic finding for an **inferior wall myocardial infarction** [1]. - These leads correspond to the **diaphragmatic surface** of the heart, supplied primarily by the **right coronary artery** (RCA) in most individuals. *Anterior wall* - An **anterior wall myocardial infarction** typically shows **ST elevation** in leads **V1-V4** [2]. - This region is usually supplied by the **left anterior descending** (LAD) coronary artery. *Posterior wall* - A **posterior wall myocardial infarction** is often characterized by **ST depression** in leads **V1-V3** and prominent R waves, which are reciprocal changes to posterior ST elevation [2]. - This area is usually supplied by the **circumflex artery** or a dominant RCA. *Lateral wall* - A **lateral wall myocardial infarction** is indicated by **ST elevation** in leads **I, aVL, V5, and V6** [1]. - The lateral wall is primarily supplied by the **circumflex artery** or marginal branches of the LAD. *Symptoms* - Presenting symptoms such as chest pain and sweating (signs of sympathetic activation) are characteristic of acute myocardial ischemia [3].

Question 1403: A 45-year-old male presents with palpitations and dizziness. His ECG shows a regular, narrow complex tachycardia at 180 bpm. Carotid massage and adenosine are ineffective. What is the likely diagnosis?

A. Atrial fibrillation
B. Atrial flutter
C. Atrioventricular nodal reentrant tachycardia
D. Focal atrial tachycardia (Correct Answer)

Explanation: ***Focal atrial tachycardia*** - This is a **narrow complex tachycardia** that is typically **regular** and can be resistant to **adenosine** and **carotid massage**, making it a likely diagnosis when these vagal maneuvers are ineffective. - ECG often shows discrete **P waves** with an abnormal morphology and axis, followed by narrow QRS complexes, which distinguishes it from reentrant tachycardias that typically lack clear P waves. *Atrial fibrillation* - Characterized by an **irregularly irregular rhythm** and the **absence of distinct P waves** on ECG, which contradicts the described regular rhythm [1]. - While it can cause palpitations and dizziness, the lack of regularity rules it out in this scenario. *Atrial flutter* - Typically presents with a **sawtooth pattern** of P waves, known as flutter waves, which are not mentioned here. - Though it can be regular, it often responds to adenosine by slowing the ventricular rate, revealing the flutter waves, which did not occur after adenosine in this case. *Atrioventricular nodal reentrant tachycardia* - This is often a **regular, narrow complex tachycardia** [1] that is typically **terminated by vagal maneuvers** or **adenosine** which were ineffective in this patient. - The P waves are usually hidden within the QRS complex or appear immediately after it (pseudo-R' or pseudo-S waves), rather than clearly visible as in focal atrial tachycardia.

Question 1404: In a 60-year-old man with chronic heart failure, what is the most likely cause of decreased exercise tolerance?

A. Decreased cardiac output (Correct Answer)
B. Decreased total peripheral resistance
C. Increased systemic vascular resistance
D. Increased stroke volume due to compensatory mechanisms

Explanation: ***Decreased cardiac output*** - **Chronic heart failure** is characterized by the heart's inability to pump sufficient blood to meet the body's metabolic demands, directly leading to **decreased cardiac output**. [1] - Reduced cardiac output limits oxygen delivery to muscles during exertion, causing **fatigue** and decreased **exercise tolerance**. [1] *Increased systemic vascular resistance* - While **increased systemic vascular resistance (SVR)** can occur in heart failure as a compensatory mechanism (due to activation of the **renin-angiotensin-aldosterone system** and sympathetic nervous system), it primarily raises afterload and further impedes cardiac output, rather than being the direct cause of exercise intolerance. - The direct cause of reduced exercise capacity is the resultant **lowered cardiac output**, which this increased resistance contributes to. *Decreased total peripheral resistance* - **Decreased total peripheral resistance** would typically improve cardiac output by reducing afterload, and thus would not be a cause of decreased exercise tolerance in chronic heart failure. - In fact, in chronic heart failure, compensatory mechanisms often lead to **increased**, not decreased, peripheral resistance. *Increased stroke volume due to compensatory mechanisms* - In heart failure, the **stroke volume** is typically **reduced** due to impaired contractility or filling. [1] - While compensatory mechanisms like **Frank-Starling law** (increased preload) can transiently increase stroke volume, chronic heart failure is fundamentally marked by a **failing heart** and an overall inability to maintain adequate stroke volume and cardiac output, especially during exertion. [1]

Question 1405: Which of the following is the most important preoperative test for a patient with a history of cardiovascular disease?

A. Complete blood count
B. Electrocardiogram (Correct Answer)
C. Chest X-ray
D. Urinalysis

Explanation: ***Electrocardiogram*** - An **ECG** is crucial for patients with a history of **cardiovascular disease** to assess for existing or new cardiac rhythm abnormalities, ischemia, or infarction that could impact surgical risk. - It helps identify patients who may require further cardiac evaluation or optimization before surgery to prevent **perioperative cardiac events**. *Complete blood count* - A **complete blood count (CBC)** assesses overall health, detects anemia, infection, and platelet disorders, which are important for surgical planning. - While important, it doesn't directly evaluate the function or status of the **cardiovascular system** itself in the same way an ECG does. *Chest X-ray* - A **chest X-ray** provides information about lung fields, heart size, and major blood vessels. It is useful for detecting pulmonary issues or significant cardiomegaly. - However, it does not offer the same detailed functional assessment of the heart's electrical activity or potential ischemic changes as an **ECG**. *Urinalysis* - **Urinalysis** screens for kidney disease, urinary tract infections, and diabetes, which are important general health indicators. - It provides no direct information about the **cardiovascular system** or its operative risk secondary to cardiac disease.

Question 1406: A 35-year-old male experiences sudden chest pain and shortness of breath. An ECG reveals ST-segment elevation. What is the most likely underlying physiological process?

A. Aortic dissection
B. Pulmonary embolism
C. Myocardial infarction (Correct Answer)
D. Pericarditis

Explanation: ***Myocardial infarction*** - **ST-segment elevation** on an ECG is a classic sign of an **ST-elevation myocardial infarction (STEMI)**, indicating transmural ischemia [2]. - This is caused by a complete and sustained occlusion of a **coronary artery**, leading to myocardial cell death [1] [3]. *Aortic dissection* - While it causes sudden severe chest pain, an aortic dissection typically presents with a **tearing or ripping pain** and often involves pulse deficits or blood pressure differentials. - ECG findings are usually non-specific or show signs of left ventricular hypertrophy, but **ST-segment elevation** is not characteristic. *Pulmonary embolism* - Pulmonary embolism presents with sudden chest pain and shortness of breath, but its hallmark ECG finding is often **tachycardia** and signs of right heart strain (e.g., S1Q3T3 pattern). - It does not typically cause **ST-segment elevation** unless it's a massive PE leading to severe myocardial ischemia secondary to profound hypotension. *Pericarditis* - Pericarditis causes chest pain that is often **sharp, pleuritic**, and relieved by leaning forward, and it can cause diffuse **ST-segment elevation** on ECG. - However, in pericarditis, the ST elevation is typically **concave up** and widespread, rather than localized to specific coronary territories as seen in myocardial infarction [3].

Question 1407: A 60-year-old patient presents with chest pain and a crescendo-decrescendo systolic murmur that radiates to the neck. What is the most likely diagnosis?

A. Mitral valve prolapse
B. Aortic stenosis (Correct Answer)
C. Mitral regurgitation
D. Aortic regurgitation

Explanation: ***Aortic stenosis*** - A **crescendo-decrescendo systolic murmur** radiating to the **neck** is a classic finding in aortic stenosis, indicative of turbulent flow through a narrowed aortic valve during systole [1]. - Chest pain in this context is often due to increased myocardial oxygen demand from the pressure overload [2]. *Mitral valve prolapse* - Characterized by a **mid-systolic click** followed by a **late systolic murmur**, and typically does not radiate to the neck [1]. - Symptoms can include atypical chest pain and palpitations, but the murmur presentation is distinct. *Mitral regurgitation* - Produces a **holosystolic murmur** that radiates to the **axilla**, not the neck, due to blood flowing back into the left atrium [3]. - The murmur in mitral regurgitation is usually plateau-shaped, unlike the crescendo-decrescendo pattern. *Aortic regurgitation* - Causes a **diastolic decrescendo murmur** best heard at the left sternal border, resulting from blood leaking back into the left ventricle during diastole [4]. - This condition does not present with a systolic murmur radiating to the neck.

Question 1408: Which of the following best describes the initial management of a patient with Klippel-Trenaunay syndrome?

A. Conservative management with compression stockings (Correct Answer)
B. Immediate surgical intervention
C. Sclerotherapy for varicose veins
D. Lymphatic drainage

Explanation: ***Conservative management with compression stockings*** * **Klippel-Trenaunay syndrome (KTS)** is a congenital disorder characterized by a triad of capillary malformations (port-wine stains), venous malformations (varicose veins), and limb overgrowth. * Initial management focuses on alleviating symptoms and preventing complications through non-invasive methods, with **compression garments** being crucial for managing lymphedema, venous insufficiency, and pain. *Immediate surgical intervention* * **Surgical intervention** in KTS is typically reserved for severe complications or functional impairment, like limb length discrepancy or arterial-venous fistulas, which are not the primary initial approach. * Non-conservative measures are usually explored only after conservative treatment fails or if there are life-threatening complications. *Sclerotherapy for varicose veins* * While sclerotherapy can be used for **varicose veins** in KTS, it is usually considered after or in conjunction with conservative management. * It specifically targets the venous malformations but does not address the other components like **limb overgrowth** or comprehensive symptom management in the initial phase. *Lymphatic drainage* * **Manual lymphatic drainage (MLD)** is a component of complete decongestive therapy for managing lymphedema. * While lymphedema can be a feature of KTS, **lymphatic drainage** alone is usually part of a broader conservative strategy that often includes compression therapy.

Question 1409: A 72-year-old patient presents with the acute onset of chest pain and electrocardiographic changes indicative of an anterior wall myocardial infarction. What is the most effective initial treatment?

A. High-dose aspirin therapy
B. Intravenous nitroglycerin
C. Oral beta-blocker therapy
D. Primary percutaneous coronary intervention (PCI) (Correct Answer)

Explanation: ### Primary percutaneous coronary intervention (PCI) - For **ST-segment elevation myocardial infarction (STEMI)**, primary PCI is the most effective initial treatment as it directly restores blood flow to the ischemic myocardium by opening the occluded coronary artery [2]. - Guidelines recommend PCI within **90 minutes door-to-balloon time** or 120 minutes if transfer to a PCI-capable facility is required. *High-dose aspirin therapy* - While **aspirin** is crucial for its antiplatelet effects and is part of the initial management of MI, it is not the definitive treatment for reperfusion. - It helps prevent further thrombus formation but does not actively dissolve or remove the existing occlusive clot. *Intravenous nitroglycerin* - **Nitroglycerin** helps relieve angina by causing vasodilation, reducing preload and afterload, and improving coronary blood flow, but it does not directly open a completely occluded artery. - It is contraindicated in cases of **inferior wall MI with right ventricular involvement** due to the risk of severe hypotension. *Oral beta-blocker therapy* - **Beta-blockers** reduce myocardial oxygen demand, limit infarct size, and prevent arrhythmias, but they do not provide immediate reperfusion [1]. - They are typically initiated after the acute phase, once the patient is hemodynamically stable, or in specific clinical scenarios [1].

Question 1410: A 55-year-old woman with a history of rheumatic fever presents with exertional dyspnea and palpitations. On examination, there is a mid-diastolic murmur at the apex. Which valvular abnormality is most likely present?

A. Aortic stenosis
B. Mitral stenosis (Correct Answer)
C. Tricuspid regurgitation
D. Pulmonic stenosis

Explanation: ***Mitral stenosis*** - A history of **rheumatic fever** is a common cause of mitral stenosis [1], leading to thickening and calcification of the mitral valve. - The classic auscultatory finding in mitral stenosis is a **mid-diastolic murmur heard best at the apex** [1]. Exertional dyspnea and palpitations are symptoms of left atrial enlargement and pulmonary congestion [1]. *Aortic stenosis* - While aortic stenosis can cause exertional dyspnea and palpitations, its characteristic murmur is a **systolic ejection murmur** heard best at the right upper sternal border, often radiating to the carotid arteries. - Aortic stenosis is more commonly associated with **degenerative calcification** in older adults [2] or a bicuspid aortic valve, rather than rheumatic fever as the primary cause in this age group, though rheumatic fever can affect this valve too. *Tricuspid regurgitation* - This condition presents with a **holosystolic murmur** best heard at the left lower sternal border, which typically **intensifies with inspiration**. - While rheumatic fever can affect the tricuspid valve, isolated tricuspid regurgitation is less common as the primary finding with these symptoms and a mid-diastolic murmur is not characteristic. *Pulmonic stenosis* - Pulmonic stenosis is characterized by a **systolic ejection murmur** heard best at the left upper sternal border, often associated with a thrill. - Symptoms like exertional dyspnea and palpitations can occur, but it is less commonly caused by rheumatic fever and does not produce a mid-diastolic murmur at the apex.

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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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