Cardiology Practice Questions

Q: A patient with a history of throat infection presents with a water hammer pulse. What is the most likely diagnosis?

Rheumatic fever with aortic regurgitation. ***Rheumatic fever with aortic regurgitation***- The history of a preceding **streptococcal throat infection** suggests **Acute Rheumatic Fever (ARF)**, which is the leading cause of acquired valvular heart disease globally.- **Aortic Regurgitation (AR)** is a common manifestation of rheumatic carditis [1] and characteristically presents with physical signs of high pulse pressure, such as the bounding, rapidly collapsing pulse known as the **water hammer pulse** (Corrigan's pulse) [2].*Infective endocarditis*- Although **infective endocarditis (IE)** can cause acute **Aortic Regurgitation (AR)** due to cusp destruction [3], the history of a preceding **throat infection** is a classic antecedent for **rheumatic fever**, not typical IE.- IE usually presents with fever, new murmur, and systemic emboli, often in patients with pre-existing valve disease or intravenous drug use.*Mitral stenosis*- **Mitral stenosis (MS)** results in decreased flow from the left atrium to the left ventricle, which *does not* lead to wide pulse pressure.- It is characterized by a **loud S1**, **opening snap**, and **mid-diastolic rumble**; MS does not cause a water hammer pulse, which is specific to **Aortic Regurgitation**.*Aortic stenosis*- **Aortic stenosis (AS)** causes mechanical obstruction to left ventricular outflow, resulting in low pulse pressure and a small, slow-rising pulse (**pulsus parvus et tardus**) [4].- AS is hemodynamically the opposite of **Aortic Regurgitation**, and therefore highly unlikely to present with a wide pulse pressure or a **water hammer pulse**.

Q: Which of the following is associated with a Graham-Steel murmur?

Pulmonary regurgitation. Detailed heart murmur assessment is necessary for diagnosis. While early diastolic murmurs are typically associated with valvular regurgitation, the specific Graham-Steel murmur is a high-pitched, early diastolic decrescendo murmur heard best over the pulmonary area [1]. It is specifically caused by pulmonary regurgitation that develops secondary to severe pulmonary hypertension. Ventricular septal defect (VSD) typically causes a pansystolic (holosystolic) murmur heard at the left sternal border. While VSD can lead to severe pulmonary hypertension, the primary associated murmur related to the defect itself is holosystolic. Hypertrophic obstructive cardiomyopathy (HOCM) is characterized by a harsh, mid-systolic ejection murmur heard at the left sternal border or apex [1]. Aortic regurgitation also produces an early diastolic decrescendo murmur, often heard at the left sternal edge [2]. It is due to failure of the aortic valve and is distinct from the Graham-Steel murmur, which is tied to pulmonary hypertension.

Q: In the context of mitral stenosis, which clinical feature is typically observed?

Loud S1. ***Loud S1*** - Mitral stenosis keeps the mitral leaflets in an open position until late diastole, resulting in an **abrupt and forceful closure** at the onset of systole, producing an abnormally loud S1. - This loud, snapping S1 is one of the **classic auscultatory findings** in non-calcific, mobile mitral stenosis. - The intensity of S1 correlates with valve mobility; as the valve becomes more calcified and immobile, S1 becomes softer. *Absent S1* - An absent or soft S1 indicates a **severely calcified, immobile mitral valve** (very advanced stenosis) or significant mitral regurgitation. - In early to moderate mitral stenosis, the valve leaflets remain mobile enough to generate a loud closure sound. - Loss of S1 intensity suggests progression to severe, end-stage valvular disease. *S3 gallop* - An S3 gallop is a sign of **rapid ventricular filling** caused by volume overload, typically heard in left ventricular systolic heart failure or significant mitral regurgitation. - Since mitral stenosis **restricts diastolic filling** into the left ventricle, an S3 is generally not heard in pure, isolated mitral stenosis. - The presence of S3 in a patient with MS should raise suspicion for coexistent left ventricular dysfunction or mixed valvular disease. *Muffled heart sounds* - Muffled or distant heart sounds suggest pathologies that dampen sound conduction, such as **pericardial effusion**, severe obesity, or emphysema. - Mitral stenosis characteristically produces **accentuated sounds** (loud S1, opening snap, diastolic rumble) rather than muffled sounds. - The presence of muffled sounds should prompt evaluation for alternative or additional cardiac pathology.

Q: A 58-year-old woman comes to the clinic for a routine follow-up. She has a history of mild hypertension, which is well-controlled with medication. She reports no symptoms such as palpitations, dizziness, or chest pain. Her ECG shows a prolonged PR interval of 0.24 seconds with regular 1:1 AV conduction and narrow QRS complexes. What is the most likely diagnosis based on these ECG findings?

First-Degree AV Block. ***First-Degree AV Block*** - This ECG demonstrates a fixed and prolonged **PR interval** that is greater than 0.20 seconds (more than 5 small squares), which is the defining characteristic of a first-degree AV block. - There is a consistent **1:1 conduction** between the atria and ventricles, meaning every P wave is followed by a QRS complex, distinguishing it from higher-degree blocks. *Second-Degree AV Block* - This condition is characterized by intermittently **non-conducted P waves**, resulting in 'dropped' QRS complexes, which are not present in this ECG. - It has two types: **Mobitz I (Wenckebach)** with progressive PR prolongation before a dropped beat, and **Mobitz II** with a constant PR interval before an unpredictable dropped beat. *Third-Degree AV Block* - Also known as complete heart block, this involves complete **AV dissociation**, where there is no relationship between P waves and QRS complexes. - On an ECG, P waves and QRS complexes would occur at their own independent, regular rates, which is contrary to the 1:1 conduction seen here. *Bundle Branch Block* - The primary feature of a bundle branch block is a **wide QRS complex** (≥0.12 seconds) due to delayed ventricular depolarization. - The QRS complex in this ECG is **narrow** (<0.12 seconds), which rules out a bundle branch block.

Q: A chronic smoker presented with bilateral pitting pedal edema, and abdominal distension. On examination, he had ascites and auscultation revealed an S3. Which of the following defects can be seen in this patient?

Tricuspid regurgitation. ***Tricuspid regurgitation*** - This patient presents with **classic signs of right heart failure**: bilateral pitting pedal edema, ascites, and abdominal distension indicating systemic venous congestion [1] - **Chronic smoking → COPD → pulmonary hypertension → functional tricuspid regurgitation** is a common pathophysiological sequence - **S3 gallop** indicates ventricular volume overload, which occurs in TR due to regurgitant flow - TR leads to **hepatic congestion** (causing ascites) and **peripheral edema** from elevated systemic venous pressure - Clinical triad: **elevated JVP, hepatomegaly, and peripheral edema** points to TR *Incorrect: Aortic stenosis* - Causes **left-sided heart failure**, not right-sided [2] - Classic presentation: **angina, syncope, and dyspnea** (not peripheral edema and ascites) [2] - Would not explain the systemic venous congestion seen in this patient *Incorrect: Mitral regurgitation* - Primarily causes **left-sided heart failure** with pulmonary congestion [1] - Initial presentation includes **dyspnea and pulmonary edema**, not peripheral edema [1] - While chronic MR can eventually lead to right heart failure, the **predominant right-sided signs** make this less likely *Incorrect: Aortic regurgitation* - Causes **left-sided heart failure** [3] - Classic signs include **wide pulse pressure, bounding pulses**, and water-hammer pulse [3] - Does not explain the **right-sided failure** picture with ascites and bilateral pedal edema

Q: Which of the following drugs reduces mortality in a patient with heart failure?

Metoprolol. ***Correct: Metoprolol*** - *Beta-blockers* like **Metoprolol succinate** (extended-release form) reduce mortality in patients with **HFrEF** (Heart Failure with reduced Ejection Fraction) by blocking the deleterious effects of chronic sympathetic nervous system activation on the myocardium [1]. - These drugs prevent ventricular remodeling, reduce **sudden cardiac death** by lowering heart rate and improving oxygen demand/supply balance, and are cornerstone therapies alongside **ACE inhibitors/ARBs/ARNI** [1]. *Incorrect: Furosemide* - Furosemide is a **loop diuretic** used primarily for **symptom relief** (reducing edema, dyspnea) by promoting diuresis and natriuresis to manage volume overload. - It does not modify the underlying disease progression or cardiac remodeling and, thus, has **no demonstrated mortality benefit** in heart failure trials. *Incorrect: Prazosin* - Prazosin is an **alpha-1 adrenergic blocker** used primarily as a vasodilator or for hypertension, but it has not shown benefit and may even increase adverse events in long-term heart failure management. - Unlike approved vasodilator therapies (like hydralazine/nitrate combination in certain populations), Prazosin is **not recommended** for chronic HF therapy due to lack of mortality data and potential for **orthostatic hypotension**. *Incorrect: Torsemide* - Torsemide is a **high-ceiling loop diuretic** similar to Furosemide, typically used to manage symptoms of congestion and fluid retention in heart failure patients. - While some studies suggest better bioavailability than Furosemide, it ultimately functions as a diuretic and **does not confer a mortality benefit** in heart failure.

Q: A patient presents with dyspnea and distended neck veins that increase on inspiration. There is no murmur. What is the diagnosis?

Constrictive pericarditis. ***Constrictive pericarditis***- The combination of dyspnea, distended neck veins, and the increase of neck vein distension on inspiration (**Kussmaul sign**) is highly suggestive of constrictive physiology, such as **constrictive pericarditis** [2].- This condition involves a rigid pericardium impairing diastolic filling, leading to elevated right atrial pressure and fixed cardiac volume, hence the characteristic **Kussmaul sign** [2].*Aortic regurgitation*- Typically presents with symptoms of left-sided heart failure (e.g., paroxysmal nocturnal dyspnea) and is characterized by a prominent **diastolic decrescendo murmur** [3].- Peripheral signs usually include **wide pulse pressure** and a bounding pulse (**water-hammer pulse**), none of which explain the Kussmaul sign [3].*Tricuspid stenosis*- This condition would cause right heart failure symptoms (JVD) but is always associated with a **diastolic rumbling murmur** best heard at the left sternal border or xiphoid area.- While **Kussmaul sign** can sometimes be seen in severe tricuspid stenosis, the primary feature is the presence of the characteristic murmur, which is noted as absent here.*Pulmonary arterial hypertension*- This condition causes right-sided heart failure (leading to JVD) but lacks the mechanical restriction of filling necessary to reliably produce the specific **Kussmaul sign** [1].- It is often associated with signs of secondary **tricuspid regurgitation** (a holosystolic murmur) due to right ventricular dilation [1].

Q: A large 'V' wave on jugular venous pulse (JVP) examination is characteristic of:

Tricuspid regurgitation. ***Tricuspid regurgitation*** - A large **'V' wave** (ventricular systole) on JVP signifies increased pressure in the right atrium due to substantial **regurgitant flow** back from the right ventricle against a closed tricuspid valve.- This results in the rapid filling and distention of the right atrium during ventricular systole, often accompanied by the blunting or absence of the normal **'x' descent** (the 'x' descent is replaced by a systolic wave).*Aortic regurgitation* - Aortic regurgitation (AR) primarily affects the **left heart** and does not directly alter the established right heart pressure waveforms seen in the JVP [1].- Clinical signs of AR include a wide **pulse pressure**, **water-hammer pulse**, and diastolic murmur, but not specific waveform changes on JVP [3].*Tricuspid stenosis*- **Tricuspid stenosis** causes resistance to flow from the RA to the RV, leading to an exaggerated pressure rise during RA contraction, resulting in a prominent (tall) **'a' wave** [2].- The **'y' descent** is typically slow or attenuated because the rapid filling phase of the RV is impaired by the stenotic valve [2].*Atrial fibrillation* - In **atrial fibrillation (AFib)**, the uncoordinated atrial activity eliminates the mechanical contraction of the atria, causing the JVP tracing to lose the distinct **'a' wave**.- The ventricular rate is typically rapid and irregular, making JVP waveforms irregular, but it does not specifically cause a massive 'V' wave.

Question 1

A 65-year-old male with chronic stable angina presents with worsening chest pain during routine activities. His current medications include aspirin, clopidogrel, metoprolol, and atorvastatin, but his symptoms persist. ECG shows ST-segment depression in V5-V6, and coronary angiography reveals 80% stenosis of the left anterior descending (LAD) artery. What is the most appropriate intervention?

Accepted Answer

Percutaneous coronary intervention (PCI) with drug-eluting stent (DES)

Answer

Add ranolazine to medical therapy

Answer

Increase the dose of beta-blockers

Answer

Refer for coronary artery bypass grafting (CABG)

Question 2

A patient with a history of throat infection presents with a water hammer pulse. What is the most likely diagnosis?

Accepted Answer

Rheumatic fever with aortic regurgitation

Answer

Infective endocarditis

Answer

Aortic stenosis

Answer

Mitral stenosis

Question 3

Which of the following is associated with a Graham-Steel murmur?

Accepted Answer

Pulmonary regurgitation

Answer

Aortic regurgitation

Answer

Hypertrophic obstructive cardiomyopathy (HOCM)

Answer

Ventricular septal defect (VSD)

Question 4

In the context of mitral stenosis, which clinical feature is typically observed?

Accepted Answer

Loud S1

Answer

S3 gallop

Answer

Muffled heart sounds

Answer

Absent S1

Question 5

A 58-year-old woman comes to the clinic for a routine follow-up. She has a history of mild hypertension, which is well-controlled with medication. She reports no symptoms such as palpitations, dizziness, or chest pain. Her ECG shows a prolonged PR interval of 0.24 seconds with regular 1:1 AV conduction and narrow QRS complexes. What is the most likely diagnosis based on these ECG findings?

Accepted Answer

First-Degree AV Block

Answer

Third-Degree AV Block

Answer

Second-Degree AV Block

Answer

Bundle Branch Block

Question 6

A chronic smoker presented with bilateral pitting pedal edema, and abdominal distension. On examination, he had ascites and auscultation revealed an S3. Which of the following defects can be seen in this patient?

Accepted Answer

Tricuspid regurgitation

Answer

Aortic stenosis

Answer

Mitral regurgitation

Answer

Aortic regurgitation

Question 7

Which of the following drugs reduces mortality in a patient with heart failure?

Accepted Answer

Metoprolol

Answer

Prazosin

Answer

Torsemide

Answer

Furosemide

Question 8

A patient presents with dyspnea and distended neck veins that increase on inspiration. There is no murmur. What is the diagnosis?

Accepted Answer

Constrictive pericarditis

Answer

Pulmonary arterial hypertension

Answer

Tricuspid stenosis

Answer

Aortic regurgitation

Question 9

A large 'V' wave on jugular venous pulse (JVP) examination is characteristic of:

Accepted Answer

Tricuspid regurgitation

Answer

Aortic regurgitation

Answer

Tricuspid stenosis

Answer

Atrial fibrillation

Question 10

A 62-year-old male presents with sudden onset of shortness of breath and bilateral pedal edema. He is compliant with antihypertensive medications. Echocardiography reveals ejection fraction of 60 %, concentric left ventricular hypertrophy, left atrial enlargement, and grade 2 diastolic dysfunction. What is the most appropriate next step to improve his condition?

Accepted Answer

Initiate loop diuretics and SGLT2 inhibitors for management of HFpEF

Answer

Start digoxin to enhance myocardial contractility

Answer

Perform coronary angiography to rule out ischemic cardiomyopathy

Answer

Initiate ivabradine to reduce heart rate and improve diastolic filling

Cardiology — MCQs

Cardiology — MCQs

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