Cardiology — MCQs

A 40-year-old male patient presents to the Emergency department with central chest pain for 2 hours. The ECG shows ST segment depression and cardiac troponins are elevated. The patient has a positive history of previous PCI 3 months back. He is administered Aspirin, Clopidogrel, Nitrates, and LMWH in the Emergency Department and shifted to the coronary care unit. What is the best recommended course of further action?

Q1537

Subclavian steal syndrome is

Q1538

What is the most likely cause of fluid overload in a patient presenting with shortness of breath?

Q1539

Graham Steell murmur is associated with which of the following conditions?

Q1540

In which of the following conditions is differential cyanosis observed?

Cardiology Indian Medical PG Practice Questions and MCQs

Question 1531: Which of the following is not recommended for patients with coronary artery disease?

A. Vitamin E (Correct Answer)
B. Potassium
C. Statins
D. Daily exercise

Explanation: ***Vitamin E*** - **Vitamin E supplements** are generally not recommended for patients with coronary artery disease (CAD) based on current evidence. Some studies suggest a potential link between high doses of vitamin E and an increased risk of **heart failure** or even **overall mortality**. - There is no convincing evidence that vitamin E supplements provide cardiovascular benefits in patients with established CAD, and they may interfere with the efficacy of other beneficial medications like **statins**. *Daily exercise* - **Regular physical activity** is a cornerstone of CAD management, improving cardiovascular fitness, reducing blood pressure, and aiding in weight control [1]. - It helps in preventing disease progression and reducing the risk of future cardiovascular events when performed under appropriate medical guidance [1]. *Potassium* - Maintaining adequate **potassium levels** is crucial for patients with CAD, especially those on diuretics, as it helps regulate **blood pressure** and prevents **cardiac arrhythmias**. - Dietary sources of potassium (fruits, vegetables) are preferred, and supplementation may be necessary for those with deficiencies, but always under medical supervision. *Statins* - **Statins** are a class of medications widely recommended for patients with CAD due to their ability to significantly lower **LDL cholesterol** levels and reduce cardiovascular events [1]. - They stabilize **atherosclerotic plaques** and reduce inflammation, playing a critical role in secondary prevention of heart attacks and strokes [1].

Question 1532: Murmur heard in aortic stenosis

A. Apex, low pitch murmur associated with mitral valve issues
B. Pan-systolic murmur, high pitch murmur associated with mitral regurgitation
C. Left Sternal area, murmur indicating mitral regurgitation
D. Right 2nd intercostal, high pitch systolic ejection murmur (Correct Answer)

Explanation: ***Right 2nd intercostal, high pitch systolic ejection murmur*** - The murmur of **aortic stenosis** is classically heard loudest at the **right second intercostal space** (aortic area) due to turbulent flow through the stenosed aortic valve. - It is a **high-pitched, systolic ejection murmur** with a crescendo-decrescendo pattern, often radiating to the carotid arteries [2]. *Apex, low pitch murmur associated with mitral valve issues* - A murmur heard at the **apex** that is low-pitched typically suggests **mitral stenosis**, which is a diastolic rumble, not an aortic stenosis murmur [1]. - This option refers to characteristics associated with **mitral valve disease**, not aortic stenosis. *Pan-systolic murmur, high pitch murmur associated with mitral regurgitation* - A **pan-systolic murmur** is characteristic of conditions like **mitral regurgitation** or tricuspid regurgitation, where blood flows throughout the entire systole [3]. - While it can be high-pitched, its pan-systolic nature and association with mitral regurgitation make it distinct from aortic stenosis. *Left Sternal area, murmur indicating mitral regurgitation* - Murmurs heard primarily at the **left sternal area** can indicate various conditions, but this option specifically points to **mitral regurgitation**. - **Mitral regurgitation** is better heard at the apex and usually radiates to the axilla, and the description does not fit the typical presentation of aortic stenosis [3].

Question 1533: In the context of ventricular tachycardia, what do extra systoles appear as on an electrocardiogram (ECG)?

A. P wave
B. QRS complex (Correct Answer)
C. T wave
D. R wave

Explanation: ***QRS complex*** - Extra systoles, particularly **premature ventricular contractions (PVCs)**, originate in the ventricles and result in a **wide and bizarre QRS complex** on an ECG [2]. - The QRS complex represents **ventricular depolarization**, and in ventricular tachycardia, the *ventricular activity* dominates the ECG tracing [2]. *P wave* - The **P wave** represents **atrial depolarization** and is typically either absent or dissociated from the QRS complex in ventricular tachycardia [1], [2]. - Its presence or absence helps differentiate supraventricular from ventricular arrhythmias. *T wave* - The **T wave** represents **ventricular repolarization**, which typically follows the QRS complex [1]. - While it will be present, it often appears abnormal or discordant in ventricular tachycardia due to the altered ventricular depolarization. *R wave* - The **R wave** is part of the QRS complex, specifically the first positive deflection. - While an R wave is present within the QRS complex of an extrasystole, referring to the entire **QRS complex** is more accurate as it encompasses the complete ventricular depolarization in an abnormal morphology.

Question 1534: In a patient with heart disease, which condition is most commonly associated with left atrial enlargement?

A. Mitral stenosis (Correct Answer)
B. Tricuspid regurgitation
C. AR
D. None of the options

Explanation: ***Mitral stenosis*** - **Mitral stenosis** leads to an obstruction of blood flow from the **left atrium to the left ventricle**, causing pressure buildup in the left atrium [1]. - This increased pressure over time results in **left atrial enlargement** as the chamber struggles to push blood through the narrowed valve [1]. *Tricuspid regurgitation* - **Tricuspid regurgitation** involves the backflow of blood from the **right ventricle to the right atrium**. - This condition primarily affects the **right side of the heart**, leading to **right atrial enlargement**, not left. *AR* - **Aortic regurgitation (AR)** is the backflow of blood from the **aorta into the left ventricle**. - While AR can cause **left ventricular enlargement** and eventually lead to left atrial dilation, it is not the most common direct cause of *primary* left atrial enlargement compared to mitral stenosis [2]. *None of the options* - **Mitral stenosis** is a well-established cause of significant left atrial enlargement due to the direct pressure overload it imposes on the left atrium [1].

Question 1535: Which of the following is associated with WPW syndrome?

A. Ebstein anomaly (Correct Answer)
B. TOF
C. VSD
D. TAPVC

Explanation: ***Ebstein anomaly*** - **Ebstein anomaly** is a congenital heart defect characterized by apical displacement of the septal and posterior leaflets of the tricuspid valve, which is strongly associated with **Wolff-Parkinson-White (WPW) syndrome.** - WPW syndrome, involving an **accessory pathway** that bypasses the AV node [1], is found in 5-25% of patients with Ebstein anomaly, predisposing them to re-entrant tachycardias [3]. *TOF* - **Tetralogy of Fallot (TOF)** is a complex cyanotic congenital heart defect that includes four main features: VSD, pulmonary stenosis, overriding aorta, and right ventricular hypertrophy [2]. - There is no direct or strong association between TOF and WPW syndrome. *VSD* - A **Ventricular Septal Defect (VSD)** is a common congenital heart defect where there is an opening in the interventricular septum, allowing blood to flow between the ventricles [4]. - While VSDs can occur with other cardiac anomalies, there is no specific or frequent association with WPW syndrome. *TAPVC* - **Total Anomalous Pulmonary Venous Connection (TAPVC)** is a rare congenital heart defect where all four pulmonary veins connect to the systemic venous circulation instead of the left atrium. - This condition does not have a recognized association with WPW syndrome.

Question 1536: A 40-year-old male patient presents to the Emergency department with central chest pain for 2 hours. The ECG shows ST segment depression and cardiac troponins are elevated. The patient has a positive history of previous PCI 3 months back. He is administered Aspirin, Clopidogrel, Nitrates, and LMWH in the Emergency Department and shifted to the coronary care unit. What is the best recommended course of further action?

A. Early Revascularization with PCI (Correct Answer)
B. Continue conservative management and monitoring of cardiac enzymes and ECG
C. Continue conservative management and plan for outpatient follow-up
D. Immediate Revascularization with Coronary Angiography

Explanation: ***Early Revascularization with PCI*** - The patient presents with **NSTEMI** (ST depression, elevated troponins) and is already on antiplatelet and anticoagulant therapy. **Early revascularization** (ideally within 24 hours for high-risk NSTEMI) is indicated to restore blood flow and prevent further myocardial damage [1]. - Given the patient's history of prior **PCI** and the current NSTEMI presentation, this suggests possible **in-stent restenosis** or progression of coronary artery disease, making revascularization crucial. *Continue conservative management and monitoring of cardiac enzymes and ECG* - While initial conservative management with medications is appropriate, simply continuing monitoring without definitive intervention is insufficient for a **high-risk NSTEMI** patient. - The elevated troponins and ST depression indicate ongoing myocardial injury that requires active management beyond just observation [1]. *Continue conservative management and plan for outpatient follow-up* - This approach is entirely inappropriate for a patient presenting with an **acute coronary syndrome (NSTEMI)**. - Outpatient follow-up is for stable conditions, not for an ongoing cardiac event that requires urgent hospital-based intervention. *Immediate Revascularization with Coronary Angiography* - **Immediate revascularization** (within 90 minutes) is primarily indicated for **STEMI** (ST elevation myocardial infarction). - While coronary angiography will precede PCI, the term "immediate" in this context usually refers to the urgency seen in STEMI; NSTEMI typically warrants "early" rather than "immediate" intervention (within 12-24 hours for high-risk patients like this one) [1].

Question 1537: Subclavian steal syndrome is

A. Reversal of blood flow in the ipsilateral vertebral artery (Correct Answer)
B. Reversal of blood flow in the contralateral carotid artery
C. Reversal of blood flow in the contralateral vertebral artery
D. B/L reversal of blood flow in vertebral arteries

Explanation: ***Reversal of blood flow in the ipsilateral vertebral artery*** - Subclavian steal syndrome occurs due to a **proximal stenosis** or **occlusion of the subclavian artery**. - This causes blood to be "stolen" from the **ipsilateral vertebral artery**, flowing retrograde to supply the arm and thereby reducing blood flow to the brainstem. *Reversal of blood flow in the contralateral carotid artery* - The carotid arteries supply blood to the brain directly and are typically not directly involved in thesteal phenomenon in this specific syndrome. - Reversal of flow in the carotid artery would indicate a much more severe and different pathology, not characteristic of subclavian steal. *Reversal of blood flow in the contralateral vertebral artery* - The steal phenomenon specifically involves the vertebral artery on the **same side (ipsilateral)** as the subclavian artery obstruction. - The contralateral vertebral artery would typically continue to supply blood to the brain without a reversed flow in this syndrome. *B/L reversal of blood flow in vertebral arteries* - Subclavian steal syndrome is generally a **unilateral phenomenon**, affecting the vertebral artery ipsilateral to the subclavian artery stenosis. - Bilateral reversal would imply bilateral subclavian artery obstruction or other severe cerebrovascular disease, which is not the definition of subclavian steal syndrome itself.

Question 1538: What is the most likely cause of fluid overload in a patient presenting with shortness of breath?

A. Nephritic syndrome
B. Cardiac failure (Correct Answer)
C. TB
D. Portal hypertension

Explanation: ***Cardiac failure*** - **Cardiac failure** leads to reduced cardiac output, causing blood to back up in the **pulmonary and systemic circulation**, resulting in fluid accumulation in the lungs (pulmonary edema), which manifests as **shortness of breath** [1]. - The heart's inability to pump efficiently results in increased hydrostatic pressure in capillaries, pushing fluid into interstitial spaces and pleural effusions, exacerbating respiratory distress [1]. *Nephritic syndrome* - **Nephritic syndrome** is characterized by inflammation of the glomeruli, leading to **hematuria, proteinuria, and hypertension**. While it can cause fluid retention due to impaired kidney function, it primarily presents with acute renal injury and less direct, rapid onset pulmonary edema compared to cardiac failure. - The fluid accumulation in **nephritic syndrome** is more generalized (edema) rather than acutely focused on pulmonary congestion leading to shortness of breath, as seen in heart failure. *TB* - **Tuberculosis (TB)** primarily affects the lungs, causing **inflammation, granuloma formation, and tissue destruction**, but usually does not directly cause acute fluid overload and pulmonary edema leading to shortness of breath in the manner that heart failure does. - While **TB** can cause pleural effusions, it is not typically associated with widespread fluid overload and acute pulmonary congestion as a primary mechanism of shortness of breath. *Portal hypertension* - **Portal hypertension** is an increase in blood pressure within the **portal venous system**, usually due to liver cirrhosis. This primarily leads to fluid accumulation in the **abdominal cavity (ascites)** and sometimes peripheral edema. - While significant ascites can indirectly limit diaphragmatic movement and cause some breathlessness, it does not directly cause the acute **pulmonary edema** and fluid overload that are hallmarks of cardiac failure presenting with severe shortness of breath.

Question 1539: Graham Steell murmur is associated with which of the following conditions?

A. Pulmonary Regurgitation (PR) (Correct Answer)
B. Tricuspid Regurgitation (TR)
C. Tricuspid Stenosis (TS)
D. Pulmonary Stenosis (PS)

Explanation: ***Pulmonary Regurgitation (PR)*** - The **Graham Steell murmur** is a high-pitched, decrescendo early diastolic murmur heard best at the left sternal border associated with **pulmonary hypertension**. [1] - It results from dilation of the pulmonary artery due to **elevated pulmonary pressures**, leading to functional pulmonary valve regurgitation. [1] *Tricuspid Regurgitation (TR)* - TR typically presents as a **holosystolic murmur** best heard at the left lower sternal border, often increasing with inspiration (Carvallo's sign). - It is caused by improper coaptation of the tricuspid valve leaflets, often due to **right ventricular dilation**. *Tricuspid Stenosis (TS)* - TS is characterized by a **diastolic rumble** heard best at the lower left sternal border, often with an opening snap. [2] - It is relatively rare and often associated with **rheumatic heart disease**. *Pulmonary Stenosis (PS)* - PS typically produces a **systolic ejection murmur** heard at the upper left sternal border, often radiating to the back. - It is caused by **obstruction to blood flow** from the right ventricle to the pulmonary artery.

Question 1540: In which of the following conditions is differential cyanosis observed?

A. VSD with reversal of shunt
B. PDA with reversal of shunt (Correct Answer)
C. ASD with reversal of shunt
D. Tetralogy of Fallot

Explanation: ***PDA with reversal of shunt*** - **Differential cyanosis** is characteristic of a **patent ductus arteriosus (PDA)** with **Eisenmenger syndrome**, where the shunt reverses due to pulmonary hypertension [1]. - Deoxygenated blood from the pulmonary artery shunts into the **descending aorta** distal to the origin of the subclavian arteries, resulting in cyanosis of the lower extremities while the upper extremities remain pink [1]. *VSD with reversal of shunt* - A **ventricular septal defect (VSD)** with reversed shunt typically causes **generalized cyanosis** because deoxygenated blood is shunted from the right ventricle to the left ventricle, affecting both systemic circulations [2]. - It does not produce differential cyanosis unless accompanied by coexisting cardiac anomalies that selectively affect blood flow to different parts of the body. *ASD with reversal of shunt* - An **atrial septal defect (ASD)** with reversed shunt leads to **generalized cyanosis**, as deoxygenated blood from the right atrium enters the left atrium and mixes with oxygenated blood, distributing cyanosis throughout the body [2]. - The mixing of blood occurs at the atrial level, affecting systemic circulation uniformly rather than differentially. *Tetralogy of Fallot* - **Tetralogy of Fallot** causes **generalized cyanosis** due to the right-to-left shunt through a large VSD, forcing deoxygenated blood into the systemic circulation [3]. - The degree of cyanosis depends on the severity of the right ventricular outflow tract obstruction, but it is not typically differential [3].

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Cardiology — MCQs

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