Cardiology Practice Questions

Q: A 70-year-old man with a past medical history of ischemic heart disease and hypertension presents to his GP with recurrent episodes of syncope over the past 2 weeks. Based upon this ECG, which of the following clinical findings is most likely to be present?

Canon A waves. ***Canon A waves*** - **Complete heart block (3rd degree AV block)** causes **AV dissociation** where atria and ventricles beat independently, leading to occasional simultaneous atrial and ventricular contractions. - When the **right atrium contracts against a closed tricuspid valve**, it creates prominent **canon A waves** in the jugular venous pulse, which is pathognomonic for complete heart block. *Absent JVP* - The **jugular venous pulse (JVP)** would still be visible in complete heart block, though it may show irregular patterns due to **AV dissociation**. - **Canon A waves** are actually a prominent feature of the JVP in this condition, making absent JVP unlikely. *Absent hepato-jugular reflux* - The **hepato-jugular reflux** test assesses **right heart function** and venous return, which are not directly affected by conduction abnormalities. - Complete heart block primarily affects **electrical conduction**, not the mechanical function of venous return or right heart filling. *Giant V waves* - **Giant V waves** in the JVP indicate severe **tricuspid regurgitation** due to incompetent tricuspid valve during ventricular systole. - Complete heart block causes **conduction abnormalities** rather than valvular incompetence, making giant V waves an unlikely finding.

Q: Atrial fibrillation may occur in all of the following conditions, except?

Hypothyroidism. ### Explanation Atrial Fibrillation (AF) is typically triggered by structural remodeling, atrial stretch, or increased sympathetic activity [1]. **Why Hypothyroidism is the correct answer:** In thyroid disorders, **Hyperthyroidism** is a classic and frequent cause of AF due to increased sensitivity to catecholamines and direct effects of T3 on the myocardium [1]. Conversely, **Hypothyroidism** is associated with **bradyarrhythmias** (sinus bradycardia) and conduction blocks. While severe hypothyroidism (Myxedema) can rarely cause QT prolongation, it is not a recognized cause of AF. **Analysis of Incorrect Options:** * **Mitral Stenosis (MS):** This is the most common valvular cause of AF. Chronic pressure overload leads to significant left atrial (LA) enlargement and fibrosis, disrupting normal electrical conduction. * **Mitral Regurgitation (MR):** Similar to MS, chronic volume overload in MR leads to LA dilatation, which is a potent substrate for the development of AF. * **Dilated Cardiomyopathy (DCM):** The global enlargement of heart chambers and replacement fibrosis in DCM increase atrial wall stress, making AF a very common complication and a marker of poor prognosis. **NEET-PG High-Yield Pearls:** * **Most common cause of AF (Global):** Hypertension and Coronary Artery Disease. * **Most common valvular cause:** Mitral Stenosis. * **Holiday Heart Syndrome:** AF triggered by acute alcohol consumption. * **Lone AF:** AF occurring in patients <60 years old with no clinical or echocardiographic evidence of cardiopulmonary disease. * **ECG Hallmark:** "Irregularly irregular" rhythm with absent P-waves and presence of f-waves [1].

Q: Which of the following produces a continuous murmur except?

Mitral valve prolapse. A **continuous murmur** is defined as a murmur that begins in systole and continues through the second heart sound (S2) into all or part of diastole. This occurs when there is a persistent pressure gradient between two chambers or vessels throughout the entire cardiac cycle [1]. **Why Mitral Valve Prolapse (MVP) is the correct answer:** MVP typically produces a **mid-systolic click** [1] followed by a **late systolic murmur**. It is not a continuous murmur because the regurgitation occurs only when the ventricular pressure rises enough to prolapse the leaflets into the left atrium during systole. Once the aortic valve closes (S2) and diastole begins, the pressure gradient shifts, and the murmur ceases. **Analysis of Incorrect Options (Causes of Continuous Murmurs):** * **Patent Ductus Arteriosus (PDA):** The classic "Gibson’s murmur." Since aortic pressure is higher than pulmonary artery pressure in both systole and diastole, flow is continuous. * **Ruptured Sinus of Valsalva (RSOV):** Usually ruptures into the right ventricle or right atrium. Because aortic diastolic pressure remains higher than right-sided pressures, a continuous murmur is produced. * **Arteriovenous (AV) Malformations:** These create a direct communication between a high-pressure artery and a low-pressure vein, maintaining a gradient throughout the cycle. **Clinical Pearls for NEET-PG:** * **Most common cause of continuous murmur:** PDA. * **Venous Hum:** A benign continuous murmur heard in the neck (disappears with jugular vein compression or turning the head). * **Cruveilhier-Baumgarten Murmur:** A continuous murmur heard over the epigastrium due to collateral circulation in portal hypertension. * **Blalock-Taussig (BT) Shunt:** A surgical cause of a continuous murmur.

Q: Pulsus paradoxus is seen in all of the following EXCEPT:

Mitral regurgitation. Explanation: **Pulsus paradoxus** is defined as an exaggerated decrease in systolic blood pressure (>10 mmHg) during inspiration. Under normal physiological conditions, inspiration increases venous return to the right heart, causing the interventricular septum to bulge slightly into the left ventricle (LV), minimally reducing LV stroke volume. **Why Mitral Regurgitation (MR) is the correct answer:** In MR, the left ventricle is "overfilled" due to the constant volume overload from the left atrium [1]. This increased preload and the presence of a "safety valve" (the regurgitant flow back into the atrium) prevent the inspiratory shift of the septum from significantly compromising LV output. Therefore, pulsus paradoxus is **not** a feature of MR. In fact, MR is often associated with a *normal* or even *diminished* respiratory variation in blood pressure. **Why the other options are incorrect:** * **Acute Asthma & Cor Pulmonale:** These involve severe respiratory distress. Large negative intrathoracic pressures during inspiration increase systemic venous return while simultaneously increasing the pooling of blood in the expanded pulmonary vasculature. This significantly reduces LV filling, leading to pulsus paradoxus. * **SVC Obstruction:** While less common than in tamponade, severe SVC obstruction can cause pulsus paradoxus due to the marked changes in intrathoracic pressure dynamics and altered venous return patterns. **NEET-PG High-Yield Pearls:** * **Most Common Cause:** Cardiac Tamponade (Classic triad: Hypotension, JVP distension, muffled heart sounds) [2]. * **Kussmaul’s Sign vs. Pulsus Paradoxus:** Pulsus paradoxus is seen in Tamponade; Kussmaul’s sign (inspiratory rise in JVP) is typically seen in **Constrictive Pericarditis** (though CP can occasionally show both). * **Reverse Pulsus Paradoxus:** Seen in Hypertrophic Obstructive Cardiomyopathy (HOCM) and during positive pressure ventilation.

Q: A 55-year-old woman presents with complaints of chest pain. She states that the chest pain predictably occurs when she climbs four flights of stairs to reach her apartment or when she has been jogging for more than 10 minutes. She is particularly concerned because her mother died of a myocardial infarction at 50 years of age. Which of the following best describes this patient's state?

Stable angina pectoris. The patient’s presentation is classic for **Stable Angina Pectoris**. The hallmark of this condition is chest pain that is **predictable, reproducible, and occurs during physical exertion** (climbing stairs, jogging) or emotional stress [1]. It is caused by a fixed coronary artery stenosis (usually >70%) that creates a "demand-supply mismatch"—the blood flow is sufficient at rest but inadequate when myocardial oxygen demand increases [2]. The pain typically resolves with rest or sublingual nitroglycerin. **2. Why the Other Options are Incorrect:** * **Arrhythmia:** While arrhythmias can cause chest discomfort or palpitations, they do not typically present with this specific, predictable relationship to physical exertion. * **Myocardial Infarction (MI):** MI involves complete coronary occlusion leading to myocardial necrosis [4]. The pain is usually more severe, lasts >20 minutes, occurs at rest, and is not relieved by rest or nitrates. [4] * **Prinzmetal Angina:** Also known as variant angina, this is caused by coronary artery vasospasm. Unlike stable angina, it characteristically occurs **at rest**, often in the early morning hours, and is not triggered by exertion. **3. NEET-PG High-Yield Pearls:** * **Gold Standard Investigation:** Coronary Angiography (to visualize stenosis). * **Initial Investigation of Choice:** Exercise Stress Test (Treadmill Test/TMT) [3]. * **Pathophysiology:** Fixed atherosclerotic plaque (Stable Angina) vs. Plaque rupture/thrombosis (Acute Coronary Syndrome) [1]. * **Management:** Lifestyle modification, Beta-blockers (first-line for symptom control), Aspirin, and Statins. * **Clinical Definition:** Stable angina is defined by the "3 Ps": **P**redictable, **P**recipitated by exertion, and **P**romptly relieved by rest. [1]

Q: What is the most likely cardiac lesion in a young adult who complains of headache, dizziness, and intermittent claudication with exercise?

Coarctation of the aorta. **Explanation:** The clinical presentation of **headache, dizziness, and intermittent claudication** in a young adult is a classic triad for **Coarctation of the Aorta (CoA)**. **1. Why Coarctation of the Aorta is correct:** CoA is a localized narrowing of the aorta, typically distal to the origin of the left subclavian artery (juxtaductal). This creates a pressure gradient: * **Proximal to the obstruction:** Hypertension occurs in the upper body, leading to **headaches, dizziness, and epistaxis**. * **Distal to the obstruction:** Hypotension and reduced blood flow occur in the lower body, causing **intermittent claudication** (leg pain during exercise) and cold extremities. * **Physical Exam:** The hallmark is **radio-femoral delay** and a significant blood pressure difference between the upper and lower limbs. **2. Why the other options are incorrect:** * **Tetralogy of Fallot (TOF):** A cyanotic heart disease characterized by "Tet spells" and squatting. It does not typically cause upper body hypertension or claudication. * **Atrial Septal Defect (ASD):** Usually asymptomatic in childhood; presents in adulthood with dyspnea, palpitations, or paradoxical embolism. It features a **fixed split S2**. * **Patent Ductus Arteriosus (PDA):** Characterized by a **continuous machinery murmur** and bounding pulses. It does not cause a pressure differential between the arms and legs. **High-Yield Clinical Pearls for NEET-PG:** * **Chest X-ray:** Look for the **"3" sign** (indentation of the aorta) and **rib notching** (due to collateral flow through intercostal arteries). * **Association:** Strongly associated with **Turner Syndrome** (bicuspid aortic valve is the most common associated cardiac anomaly). * **Diagnosis:** Echocardiography is initial; CT Angiography is the gold standard for anatomy.

Q: A 65-year-old man with a history of syncopal attacks on exertion and angina is undergoing heart valve surgery. Which kind of pulse is expected to be present before surgery?

Anacrotic pulse. ### Explanation The clinical triad of **exertional syncope, angina, and dyspnea** in an elderly patient is the classic presentation of **Aortic Stenosis (AS)**. **1. Why Anacrotic Pulse is Correct:** In severe Aortic Stenosis, the narrowed valve orifice obstructs left ventricular outflow. This results in a pulse that is slow to rise and low in amplitude, known as **Pulsus Parvus et Tardus** [1]. When a palpable notch is felt on the ascending limb of the pulse wave, it is specifically termed an **Anacrotic pulse**. This occurs because the high pressure required to force blood through the stenotic valve creates a "hesitation" or notch during the initial upstroke. **2. Analysis of Incorrect Options:** * **Dicrotic Pulse:** Characterized by two peaks, one in systole and one in diastole (after the second heart sound). It is typically seen in states of very low cardiac output and high systemic vascular resistance, such as severe **Dilated Cardiomyopathy**. * **Pulsus Bigeminus:** A rhythm disorder where a normal beat is followed by a premature ventricular contraction (PVC). It is most commonly associated with **Digoxin toxicity**. * **Pulsus Bisferiens:** Features two systolic peaks. It is characteristic of **Aortic Regurgitation (AR)** or combined AS/AR, and **Hypertrophic Obstructive Cardiomyopathy (HOCM)**. **3. NEET-PG High-Yield Pearls:** * **Aortic Stenosis:** Look for a "Harsh Crescendo-Decrescendo" systolic murmur radiating to the carotids [1]. * **Pulsus Alternans:** Alternating strong and weak beats; a hallmark of **Left Ventricular Failure**. * **Water-hammer Pulse (Corrigan’s):** Large volume, collapsing pulse seen in **Aortic Regurgitation**. * **Pulsus Paradoxus:** An exaggerated drop in systolic BP (>10 mmHg) during inspiration; classic for **Cardiac Tamponade**.

Q: Which of the following is NOT included in the differential diagnosis of this ECG finding?

Hypercalcemia. ***Hypercalcemia*** - Hypercalcemia causes **shortened QT interval** on ECG, not deep T-wave inversions. - The classic finding is **QT shortening** due to accelerated ventricular repolarization, making it an incorrect differential for deep symmetric T-wave inversions. *Intracranial Hemorrhage (ICH)* - Can cause **deep symmetric T-wave inversions** in precordial leads, particularly in subarachnoid hemorrhage. - Associated with **QT prolongation** and other repolarization abnormalities due to autonomic dysfunction. *Apical Hypertrophy of the heart* - Classic finding includes **giant T-wave inversions** in precordial leads, particularly V4-V6. - Often seen in **hypertrophic cardiomyopathy** with apical variant, creating deep symmetric T-wave changes. *Wellens' Syndrome* - Characterized by **deep symmetric T-wave inversions** in anterior precordial leads (V2-V4). - Indicates **critical LAD stenosis** and high risk for anterior wall myocardial infarction.

Q: In which condition is the intensity of a systolic murmur increased?

Severe aortic stenosis. **Explanation:** The intensity of a systolic murmur is primarily determined by the volume and velocity of blood flow across a valve or orifice. In **Severe Aortic Stenosis (AS)**, the murmur is a harsh, crescendo-decrescendo midsystolic murmur [2]. As the stenosis progresses from mild to severe, the pressure gradient across the calcified aortic valve increases significantly. This high-pressure gradient forces blood through a narrowed opening at a higher velocity, thereby increasing the turbulence and the resulting intensity of the murmur [2]. **Analysis of Options:** * **Hypertrophic Cardiomyopathy (HOCM):** While HOCM presents with a systolic murmur, its intensity typically *decreases* with increased preload (e.g., squatting) and *increases* with decreased preload (e.g., Valsalva) [1]. It does not inherently increase in intensity simply by the progression of the disease state in the same hemodynamic manner as fixed AS. * **Mitral Stenosis (MS):** This condition produces a **diastolic** murmur (mid-diastolic rumble with an opening snap), not a systolic one [3]. * **Aortic Regurgitation (AR):** This condition produces a high-pitched, blowing **early diastolic** murmur [3]. While a flow systolic murmur may coexist due to increased stroke volume, the primary pathology is diastolic. **High-Yield Clinical Pearls for NEET-PG:** * **AS Murmur Character:** The peak of the murmur occurs later in systole as the stenosis becomes more severe ("Late-peaking" murmur) [2]. * **Pulsus Parvus et Tardus:** A small, slow-rising carotid pulse is a classic sign of severe AS [2]. * **Gallavardin Phenomenon:** In elderly patients, the high-frequency components of the AS murmur may be heard best at the apex, mimicking mitral regurgitation [2]. * **Reverse Splitting of S2:** Often seen in severe AS due to delayed closure of the aortic valve.

Question 1

A 70-year-old man with a past medical history of ischemic heart disease and hypertension presents to his GP with recurrent episodes of syncope over the past 2 weeks. Based upon this ECG, which of the following clinical findings is most likely to be present?

Accepted Answer

Canon A waves

Answer

Absent JVP

Answer

Absent hepato-jugular reflux

Answer

Giant V waves

Question 2

Atrial fibrillation may occur in all of the following conditions, except?

Accepted Answer

Hypothyroidism

Answer

Mitral stenosis

Answer

Dilated cardiomyopathy

Answer

Mitral regurgitation

Question 3

Which of the following produces a continuous murmur except?

Accepted Answer

Mitral valve prolapse

Answer

Arteriovenous malformations

Answer

Ruptured sinus of Valsalva

Answer

Patent ductus arteriosus

Question 4

Pulsus paradoxus is seen in all of the following EXCEPT:

Accepted Answer

Mitral regurgitation

Answer

Corpulmonale

Answer

Acute asthma

Answer

SVC obstruction

Question 5

A 55-year-old woman presents with complaints of chest pain. She states that the chest pain predictably occurs when she climbs four flights of stairs to reach her apartment or when she has been jogging for more than 10 minutes. She is particularly concerned because her mother died of a myocardial infarction at 50 years of age. Which of the following best describes this patient's state?

Accepted Answer

Stable angina pectoris

Answer

Arrhythmia

Answer

Myocardial infarction

Answer

Prinzmetal angina

Question 6

What is the most likely cardiac lesion in a young adult who complains of headache, dizziness, and intermittent claudication with exercise?

Accepted Answer

Coarctation of the aorta

Answer

Tetralogy of Fallot (TOF)

Answer

Atrial Septal Defect (ASD)

Answer

Patent Ductus Arteriosus (PDA)

Question 7

A 65-year-old man with a history of syncopal attacks on exertion and angina is undergoing heart valve surgery. Which kind of pulse is expected to be present before surgery?

Accepted Answer

Anacrotic pulse

Answer

Dicrotic pulse

Answer

Pulsus bigeminus

Answer

Pulsus bisferiens

Question 8

A 63-year-old woman develops exertional angina and has had two episodes of syncope. Examination shows a systolic ejection murmur with radiation to the carotids and a soft S2. Which of the following is the most likely diagnosis?

Accepted Answer

aortic stenosis

Answer

mitral stenosis

Answer

mitral insufficiency

Answer

aortic insufficiency

Question 9

Which of the following is NOT included in the differential diagnosis of this ECG finding?

Accepted Answer

Hypercalcemia

Answer

Intracranial Hemorrhage (ICH)

Answer

Apical Hypertrophy of the heart

Answer

Wellens' Syndrome

Question 10

In which condition is the intensity of a systolic murmur increased?

Accepted Answer

Severe aortic stenosis

Answer

Hypertrophic cardiomyopathy

Answer

Mitral stenosis

Answer

Aortic regurgitation

Cardiology — MCQs

Cardiology — MCQs

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