Cardiology Practice Questions

Q: What is the most common cause of embolism leading to cerebrovascular disease?

Non-rheumatic atrial fibrillation. ### Explanation **Correct Answer: B. Non-rheumatic atrial fibrillation** **Concept:** Embolic strokes account for approximately 20% of all ischemic strokes. The most common source of these emboli is the heart (cardioembolism). Among all cardiac conditions, **Non-rheumatic Atrial Fibrillation (AF)** is the leading cause [1]. In AF, the ineffective contraction of the atria (particularly the left atrial appendage) leads to blood stasis, thrombus formation, and subsequent embolization to the cerebral circulation [2]. The risk increases significantly with age and the presence of other comorbidities (calculated via the CHA₂DS₂-VASc score) [2]. **Analysis of Incorrect Options:** * **A. Prosthetic valves:** While mechanical prosthetic valves carry a high risk of thromboembolism, they are statistically less common in the general population compared to the high prevalence of AF. * **C. Paradoxical embolus:** This occurs when a venous thrombus enters the systemic circulation through a Right-to-Left shunt (e.g., Patent Foramen Ovale). While a significant cause of "cryptogenic" stroke in young adults, it is not the most common cause overall. * **D. Paroxysmal supraventricular tachycardia (PSVT):** Unlike AF, PSVT (like AVNRT) does not typically cause atrial stasis or thrombus formation and is not a recognized major risk factor for systemic embolism. **NEET-PG High-Yield Pearls:** * **Most common source of cardioembolism:** Non-rheumatic Atrial Fibrillation. * **Most common site of thrombus in AF:** Left Atrial Appendage (LAA). * **Most common site of embolization in the brain:** Middle Cerebral Artery (MCA) territory [4]. * **Anticoagulation:** In non-valvular AF, DOACs (Apixaban, Rivaroxaban) are now preferred over Warfarin unless there is moderate-to-severe mitral stenosis or a mechanical heart valve [3].

Q: A 45-year-old man presents to the emergency department with dizziness. He has a history of supraventricular beats and is currently taking aspirin, atenolol, and quinine. His EKG reveals Torsades De Pointes. How should he be managed?

Magnesium. The patient is presenting with **Torsades de Pointes (TdP)**, a specific form of polymorphic ventricular tachycardia characterized by a "twisting of the points" around the isoelectric line [1]. This condition is typically associated with a **prolonged QT interval** [1]. In this clinical scenario, the patient’s use of **Quinine** (a Class IA antiarrhythmic property drug) is the likely precipitant of QT prolongation. **1. Why Magnesium is Correct:** Intravenous **Magnesium Sulfate** is the first-line treatment for Torsades de Pointes, regardless of the patient's serum magnesium levels. It works by stabilizing the cardiac membrane and suppressing the early afterdepolarizations (EADs) that trigger the arrhythmia, even if the baseline magnesium is normal [2]. **2. Why Other Options are Incorrect:** * **Digoxin:** This drug shortens the refractory period and can increase myocardial excitability. It is contraindicated here as it can worsen ventricular arrhythmias. * **Calcium:** While used in hyperkalemia-induced arrhythmias, it has no role in treating TdP and may theoretically worsen triggered activity. * **Atropine:** Used for bradycardia. While increasing the heart rate can sometimes shorten the QT interval (overdrive pacing), Magnesium remains the definitive immediate pharmacological intervention. **Clinical Pearls for NEET-PG:** * **Drug-Induced QT Prolongation:** Remember the mnemonic **"ABCDE"**: **A**ntiarrhythmics (Class IA, III), **B**iotics (Macrolides, Quinolones), **C**isapride (Antipsychotics/Antiemetics), **D**epressants (TCAs), and **E**lectrolytes (Hypokalemia, Hypomagnesemia, Hypocalcemia) [2]. * **Management Algorithm:** If the patient is unstable, immediate **Defibrillation** is required. If stable, IV Magnesium is the drug of choice. * **Secondary Prevention:** Discontinue the offending agent (Quinine in this case) and correct electrolyte imbalances [2].

Q: Severity of mitral stenosis is judged by?

S2-OS gap. **Explanation:** The severity of Mitral Stenosis (MS) is primarily determined by the pressure gradient between the Left Atrium (LA) and the Left Ventricle (LV). [2] **Why S2-OS gap is the correct answer:** The **Opening Snap (OS)** occurs when the stenotic mitral valve opens. This happens when LA pressure exceeds LV pressure. In severe MS, the LA pressure is significantly elevated to overcome the narrow orifice. Consequently, the LA pressure crosses the falling LV pressure curve much earlier during diastole. This shortens the interval between the **Aortic component of S2 (A2)** and the **Opening Snap**. [1] * **Rule:** The shorter the S2-OS interval, the more severe the Mitral Stenosis. [1] **Analysis of Incorrect Options:** * **A. Loud S1:** While a loud S1 is a classic sign of MS, it indicates a mobile, non-calcified valve. As the disease progresses and the valve becomes heavily calcified and immobile, S1 actually becomes soft. [2] Thus, it is not a reliable indicator of severity. * **C. Loud S2:** A loud P2 (pulmonary component of S2) suggests secondary Pulmonary Hypertension, which can occur in MS, but the S2-OS gap is a more direct bedside indicator of the valvular gradient itself. [2] * **D. S3:** An S3 (ventricular gallop) is caused by rapid ventricular filling. It is typically **absent** in significant MS because the stenotic valve restricts rapid filling. Its presence usually suggests associated Mitral Regurgitation or Heart Failure. **High-Yield Clinical Pearls for NEET-PG:** 1. **Length of the Mid-Diastolic Murmur (MDM):** The longer the duration of the murmur, the more severe the MS. 2. **S2-OS Interval:** 0.11 seconds indicates mild MS. [1] 3. **Graham Steell Murmur:** An early diastolic murmur of pulmonary regurgitation seen in severe MS with pulmonary hypertension. 4. **Most common cause:** Rheumatic Heart Disease.

Q: A 60-year-old mildly obese woman presents with recurrent chest pain on exertion, which has occurred over several years. She also reports painful leg cramps when walking. Her fasting blood glucose is 160 mg/dL and total serum cholesterol is 370 mg/dL. The ECG is normal and cardiac-specific proteins are negative. What is the most likely underlying condition causing her chest pain?

Atherosclerosis of coronary artery. **Explanation:** The patient presents with **Stable Angina Pectoris**, characterized by recurrent chest pain on exertion over several years [1]. The underlying pathophysiology is a mismatch between myocardial oxygen supply and demand [2], most commonly caused by **Atherosclerosis of the coronary arteries**. **1. Why Option A is Correct:** The patient has multiple major risk factors for atherosclerosis: **Age (60 years), Obesity, Diabetes Mellitus** (Fasting Glucose 160 mg/dL), and **Hypercholesterolemia** (Total Cholesterol 370 mg/dL) [4]. Furthermore, her "painful leg cramps when walking" suggest **Intermittent Claudication**, a hallmark of Peripheral Arterial Disease (PAD) [3]. The presence of systemic atherosclerosis (PAD) significantly increases the probability that her chest pain is due to coronary artery disease (CAD). **2. Why Other Options are Incorrect:** * **Option B & D:** Congenital anomalies or an intramural (myocardial bridge) course of the LAD can cause ischemia, but they typically present in younger patients and are not associated with metabolic risk factors like diabetes and hyperlipidemia. * **Option C:** Coronary arteritis (e.g., Polyarteritis Nodosa or Takayasu arteritis) is rare and usually presents with systemic inflammatory signs (fever, weight loss, elevated ESR/CRP), which are absent here. **Clinical Pearls for NEET-PG:** * **Stable Angina:** Pain occurs when the coronary lumen is narrowed by **>70%**. * **Metabolic Syndrome:** This patient likely meets the criteria (Obesity + Hyperglycemia + Dyslipidemia), which is a potent driver of premature atherosclerosis [4]. * **Normal ECG/Negative Biomarkers:** This is expected in stable angina; biomarkers (Troponin/CK-MB) only rise during acute myocardial infarction (necrosis) [1]. * **Gold Standard Investigation:** Coronary Angiography (though Stress ECG/TMT is often the initial screening step).

Q: Destination therapy is indicated in which of the following conditions?

Congestive Heart Failure (CHF). **Explanation:** **Destination Therapy (DT)** refers to the permanent implantation of a **Left Ventricular Assist Device (LVAD)** in patients with end-stage (Stage D) Heart Failure who are not candidates for a heart transplant [1]. 1. **Why CHF is the Correct Answer:** In patients with refractory **Congestive Heart Failure (CHF)**, the heart can no longer pump enough blood to meet metabolic demands despite maximal medical therapy. LVADs are used in two ways: * **Bridge to Transplant (BTT):** Temporary support until a donor heart is available [1]. * **Destination Therapy (DT):** Permanent support for patients ineligible for transplant (due to age or comorbidities) to improve survival and quality of life [1]. 2. **Why Other Options are Incorrect:** * **Myocardial Infarction (MI):** Acute management involves reperfusion (PCI/Thrombolysis). While MI can lead to CHF, DT is not an acute treatment for MI. * **Arrhythmia:** Managed with anti-arrhythmics, cardioversion, or implantable cardioverter-defibrillators (ICD), not mechanical circulatory support as a destination. * **Infective Endocarditis (IE):** Managed with prolonged antibiotics or valve replacement surgery. Active infection is actually a contraindication for LVAD implantation. **High-Yield Clinical Pearls for NEET-PG:** * **Indication:** NYHA Class IV heart failure with an Ejection Fraction <25%. * **Device Type:** Continuous-flow pumps (e.g., HeartMate 3) are currently the gold standard. * **Common Complication:** The most common cause of death post-LVAD is stroke (hemorrhagic or ischemic) and GI bleeding (due to acquired von Willebrand syndrome) [1]. * **Physical Exam:** Patients with continuous-flow LVADs often have **absent peripheral pulses** and unmeasurable blood pressure by traditional sphygmomanometry; Mean Arterial Pressure (MAP) is measured via Doppler.

Q: Which of the following is true regarding an opening snap?

It is a high-pitched diastolic sound.. ### Explanation **1. Why Option A is Correct:** The **Opening Snap (OS)** is a classic physical finding in **Mitral Stenosis (MS)** [1]. It is a sharp, high-pitched, snappy diastolic sound caused by the sudden tensing of the chordae tendineae and the stenotic valve leaflets as they reach their maximum opening limit. It occurs shortly after the second heart sound (S2), specifically during the early diastolic phase when the left atrial pressure exceeds the left ventricular pressure [1]. **2. Why the Other Options are Incorrect:** * **Option B:** An opening snap is associated with the **mitral valve** (and rarely the tricuspid valve), not the aortic valve [1]. Opening of a stenosed aortic valve produces an **ejection click**, which is a systolic sound [1]. * **Option C:** While pulmonary hypertension can occur as a complication of mitral stenosis (leading to a loud P2), the opening snap itself is a direct result of the **valvular anatomy and pressure gradients**, not the pulmonary artery pressure. * **Option D:** The OS occurs **after** the second heart sound (S2) [1]. The sequence is: S2 (A2-P2) → OS → Diastolic Rumble [2]. **3. High-Yield Clinical Pearls for NEET-PG:** * **S2-OS Interval:** The interval between the Aortic component of S2 (A2) and the Opening Snap is an indicator of the **severity of Mitral Stenosis** [1]. * **The Rule of Inverse Proportions:** A **shorter A2-OS interval** indicates **more severe MS** [1]. This is because higher left atrial pressure causes the mitral valve to "snap" open earlier in diastole. * **Disappearance of OS:** The opening snap disappears if the valve becomes **severely calcified** or immobile, as the leaflets can no longer "snap" open [1]. * **Best heard at:** The apex or the left lower sternal border using the **diaphragm** of the stethoscope (due to its high pitch).

Q: A 65-year-old man, who is on aspirin, statins, and beta-blockers for chronic stable angina, develops chest pain for the past 4 hours. He becomes unconscious and unresponsive while talking to the doctor on duty. An ECG was done. What is the best step for management of this patient?

Non-synchronous DC shock. ***Non-synchronous DC shock*** - Patient with **acute coronary syndrome** who becomes unconscious likely has **ventricular fibrillation (VF)** or **pulseless ventricular tachycardia (pVT)**, requiring immediate **defibrillation**. - **Non-synchronous DC shock** (defibrillation) is the definitive treatment for **shockable rhythms** like VF/pVT in cardiac arrest. *Chest compressions* - While **CPR** is essential in cardiac arrest, **defibrillation takes priority** in witnessed arrest with shockable rhythms. - Chest compressions should be started immediately after defibrillation if **return of spontaneous circulation (ROSC)** is not achieved. *IV amiodarone* - **Antiarrhythmic medication** used after **3 unsuccessful defibrillation attempts** in the ACLS algorithm. - Not the **first-line treatment** for VF/pVT; immediate electrical therapy is more effective than pharmacological intervention. *Synchronous DC shock* - **Cardioversion** is used for **hemodynamically unstable** but **conscious patients** with organized rhythms like **atrial fibrillation** or **ventricular tachycardia with pulse**. - **Synchronization** prevents shock delivery during the vulnerable **T-wave period**, which is irrelevant in VF where there are no organized QRS complexes.

Q: What is the most common cause of acute cor pulmonale?

Pulmonary thromboembolism.. Explanation: Cor pulmonale is defined as right ventricular (RV) hypertrophy or dilatation resulting from diseases affecting the pulmonary vasculature or parenchyma. The key to answering this question lies in the word "Acute." 1. Why Pulmonary Thromboembolism (PTE) is correct: Acute cor pulmonale occurs when there is a sudden, massive increase in pulmonary vascular resistance, leading to acute RV pressure overload and failure. Pulmonary thromboembolism is the most common cause of this phenomenon [1]. A large embolus (such as a Saddle Embolus) mechanically obstructs the pulmonary arteries, causing a rapid rise in pulmonary artery pressure that the thin-walled right ventricle cannot compensate for, leading to acute dilatation [1]. 2. Why the other options are incorrect: * Chronic Obstructive Pulmonary Disease (COPD): This is the most common cause of Chronic cor pulmonale worldwide. It leads to RV hypertrophy over years due to chronic hypoxia-induced vasoconstriction and destruction of the pulmonary capillary bed. * Pneumonia: While severe pneumonia can cause hypoxia and strain the heart, it typically presents as an infectious process rather than a primary cause of acute RV failure. * Primary Spontaneous Pneumothorax: While a tension pneumothorax can cause acute hemodynamic collapse, it does so primarily by decreasing venous return (preload) rather than isolated pulmonary hypertension leading to cor pulmonale. Clinical Pearls for NEET-PG: * Most common cause of Cor Pulmonale (overall/chronic): COPD. * Most common cause of Acute Cor Pulmonale: Pulmonary Thromboembolism. * ECG Finding: The classic S1Q3T3 pattern (deep S in lead I, Q wave and inverted T in lead III) is a sign of acute RV strain, highly suggestive of PTE [1]. * Gold Standard Diagnosis for PTE: CT Pulmonary Angiography (CTPA).

Q: What is the characteristic JVP finding in right ventricular infarction?

Kussmaul sign. ### Explanation **Correct Option: C. Kussmaul sign** Right Ventricular Infarction (RVI) leads to acute right-sided heart failure. The infarcted right ventricle becomes stiff and non-compliant, behaving like a rigid box. During inspiration, the negative intrathoracic pressure increases venous return to the right atrium. However, because the stiff RV cannot expand to accommodate this extra volume, the pressure is transmitted back to the jugular veins. This results in a paradoxical rise in JVP during inspiration, known as the **Kussmaul sign**. [1] **Analysis of Incorrect Options:** * **A. Cannon a wave:** These occur during atrioventricular dissociation (e.g., Complete Heart Block or VT) when the atrium contracts against a closed tricuspid valve. While RVI can cause heart block, cannon waves are not its *characteristic* JVP finding. * **B. Prominent x descent:** This is typically seen in **Cardiac Tamponade**. [2] In RVI, the *y* descent is usually more prominent (sharp/steep) due to the elevated atrial pressure emptying into the ventricle. * **D. Slow y descent:** A slow or delayed y descent is seen in **Tricuspid Stenosis** or Cardiac Tamponade (where it may be absent). [2] In RVI, the y descent is typically rapid. **NEET-PG High-Yield Pearls:** 1. **Clinical Triad of RVI:** Hypotension, Clear Lungs, and Elevated JVP (often with Kussmaul sign). 2. **Diagnosis:** ST-elevation in **V4R** (most sensitive lead). 3. **Management:** Treatment of choice is **IV Fluids** (to maintain preload). **Avoid Nitrates, Diuretics, and Morphine**, as they decrease preload and can precipitate severe hypotension. 4. **Differential for Kussmaul Sign:** Constrictive Pericarditis (most common cause), Restrictive Cardiomyopathy, and Right Ventricular Infarction. [1] (Note: It is usually *absent* in Cardiac Tamponade). [2]

Question 1

What is the most common cause of embolism leading to cerebrovascular disease?

Accepted Answer

Non-rheumatic atrial fibrillation

Answer

Prosthetic valves

Answer

Paradoxical embolus

Answer

Paroxysmal supraventricular tachycardia (PSVT)

Question 2

A 45-year-old man presents to the emergency department with dizziness. He has a history of supraventricular beats and is currently taking aspirin, atenolol, and quinine. His EKG reveals Torsades De Pointes. How should he be managed?

Accepted Answer

Magnesium

Answer

Digoxin

Answer

Calcium

Answer

Atropine

Question 3

A 50-year-old man has a 2-year history of angina pectoris that occurs during exercise. On physical examination, his blood pressure is 135/75 mm Hg, and his heart rate is 79/min and slightly irregular. Coronary angiography shows a fixed 75% narrowing of the anterior descending branch of the left coronary artery. He has several risk factors for atherosclerosis: smoking, hypertension, and hypercholesterolemia. Which of the following is the earliest event resulting from the effects of these factors?

Accepted Answer

Dysfunction from endothelial injury

Answer

Alteration in vasomotor tone regulation

Answer

Conversion of smooth muscle cells to foam cells

Answer

Inhibition of LDL oxidation

Question 4

Severity of mitral stenosis is judged by?

Accepted Answer

S2-OS gap

Answer

Loud S1

Answer

Loud S2

Answer

S3

Question 5

A 60-year-old mildly obese woman presents with recurrent chest pain on exertion, which has occurred over several years. She also reports painful leg cramps when walking. Her fasting blood glucose is 160 mg/dL and total serum cholesterol is 370 mg/dL. The ECG is normal and cardiac-specific proteins are negative. What is the most likely underlying condition causing her chest pain?

Accepted Answer

Atherosclerosis of coronary artery

Answer

Congenital anomalous origin of coronary artery

Answer

Coronary arteritis

Answer

Intramural course of the LAD coronary artery

Question 6

Destination therapy is indicated in which of the following conditions?

Accepted Answer

Congestive Heart Failure (CHF)

Answer

Myocardial Infarction (MI)

Answer

Arrhythmia

Answer

Infective Endocarditis (IE)

Question 7

Which of the following is true regarding an opening snap?

Accepted Answer

It is a high-pitched diastolic sound.

Answer

It is due to the opening of a stenosed aortic valve.

Answer

It indicates pulmonary arterial hypertension.

Answer

It precedes the aortic component of the second heart sound.

Question 8

A 65-year-old man, who is on aspirin, statins, and beta-blockers for chronic stable angina, develops chest pain for the past 4 hours. He becomes unconscious and unresponsive while talking to the doctor on duty. An ECG was done. What is the best step for management of this patient?

Accepted Answer

Non-synchronous DC shock

Answer

Chest compressions

Answer

IV amiodarone

Answer

Synchronous DC shock

Question 9

What is the most common cause of acute cor pulmonale?

Accepted Answer

Pulmonary thromboembolism.

Answer

Pneumonia.

Answer

Chronic obstructive pulmonary disease.

Answer

Primary spontaneous pneumothorax.

Question 10

What is the characteristic JVP finding in right ventricular infarction?

Accepted Answer

Kussmaul sign

Answer

Cannon a wave

Answer

Prominent x descent

Answer

Slow y descent

Cardiology — MCQs

Cardiology — MCQs

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