Cardiology — MCQs

Cardiology Indian Medical PG Practice Questions and MCQs

Question 841: According to the New York Heart Association (NYHA) functional classification, patients with marked limitation to physical activity belong to which grade?

A. Grade I
B. Grade II
C. Grade III (Correct Answer)
D. Grade IV

Explanation: The **New York Heart Association (NYHA) Classification** is a functional scoring system used to assess the severity of heart failure based on a patient’s symptoms and physical activity limitations [1]. ### **Explanation of the Correct Answer** **Grade III (Option C)** is characterized by **marked limitation** of physical activity [1]. Patients are comfortable only at rest. Even less-than-ordinary activity (e.g., walking short distances on level ground or dressing) causes fatigue, palpitations, or dyspnea [2]. The keyword "marked limitation" is the hallmark of Class III [1]. ### **Analysis of Incorrect Options** * **Grade I (Option A):** No limitation of physical activity. Ordinary physical activity does not cause undue fatigue or dyspnea [1]. * **Grade II (Option B):** Slight limitation of physical activity. The patient is comfortable at rest, but **ordinary** physical activity (e.g., climbing two flights of stairs) results in symptoms [1]. * **Grade IV (Option D):** Inability to carry out any physical activity without discomfort [1]. Symptoms of heart failure (dyspnea/angina) are present even **at rest** [1]. ### **High-Yield Clinical Pearls for NEET-PG** * **Dynamic Nature:** Unlike the ACC/AHA Stages of Heart Failure (A, B, C, D) which are progressive and irreversible, the NYHA class can change (improve or worsen) based on treatment and clinical status. * **Prognostic Value:** NYHA Class is a strong independent predictor of mortality; patients in Class III and IV have significantly higher mortality rates. * **Treatment Trigger:** Many heart failure therapies (e.g., Spironolactone, CRT-D) are specifically indicated based on the patient being in NYHA Class II-IV. * **Memory Tip:** * Class I: **None** * Class II: **Slight** (Ordinary activity) * Class III: **Marked** (Less than ordinary activity) * Class IV: **At Rest**

Question 842: What is the metabolic defect in accelerated hypertension?

A. Normal non-ionic metabolic acidosis
B. Ionic gap metabolic acidosis
C. Hypomagnesemia
D. Metabolic alkalosis (Correct Answer)

Explanation: ### Explanation The correct answer is **Metabolic alkalosis**. **1. Why Metabolic Alkalosis is Correct:** In accelerated (malignant) hypertension, there is severe renal ischemia caused by arteriolar damage. This triggers the **Renin-Angiotensin-Aldosterone System (RAAS)** to an extreme degree [3]. High levels of **Aldosterone** act on the distal convoluted tubules and collecting ducts of the kidney, leading to: * Increased reabsorption of Sodium ($Na^+$) and water [3]. * Increased excretion of Potassium ($K^+$) and Hydrogen ions ($H^+$) [1], [3]. The excessive loss of $H^+$ ions in the urine results in **systemic metabolic alkalosis**, often accompanied by **hypokalemia** [1]. This is a classic secondary hyperaldosteronism pattern. **2. Why the Other Options are Incorrect:** * **A & B (Metabolic Acidosis):** Metabolic acidosis (whether normal or high anion gap) is typically seen in renal *failure* (uremia) or lactic acidosis [2]. While accelerated hypertension can lead to renal failure eventually, the primary metabolic defect driven by the acute RAAS activation is alkalosis. * **C (Hypomagnesemia):** While electrolyte imbalances can occur, hypomagnesemia is not the characteristic or primary metabolic defect associated with the pathophysiology of accelerated hypertension. **3. Clinical Pearls for NEET-PG:** * **Definition:** Accelerated hypertension is characterized by a sudden increase in BP (usually >200/120 mmHg) with flame-shaped hemorrhages and exudates (Grade III Keith-Wagener-Barker retinopathy). If papilledema is present, it is termed **Malignant Hypertension**. * **Key Triad:** Severe Hypertension + Hypokalemia + Metabolic Alkalosis (due to secondary hyperaldosteronism) [1]. * **Pathology:** The hallmark vascular lesion is **Fibrinoid Necrosis** of the arterioles and **Onion-skinning** (hyperplastic arteriolitis). * **Management:** Requires controlled reduction of Mean Arterial Pressure (MAP) by no more than 25% in the first hour using IV agents like Labetalol or Nicardipine.

Question 843: What is a typical finding in cardiac tamponade?

A. Absent 'Y' descent (Correct Answer)
B. Prominent 'a' wave
C. Absent 'a' wave
D. Prominent 'Y' wave

Explanation: ### Explanation **1. Why "Absent 'Y' descent" is correct:** In cardiac tamponade, the heart is compressed by high-pressure pericardial fluid [1]. The **'y' descent** of the Jugular Venous Pulse (JVP) represents the rapid filling of the right ventricle during early diastole when the tricuspid valve opens. In tamponade, the intrapericardial pressure is so high that it exceeds the intracardiac pressure throughout diastole, preventing rapid ventricular filling. Consequently, the 'y' descent becomes **blunted or absent**. **2. Why the other options are incorrect:** * **Prominent 'a' wave:** This occurs when the right atrium contracts against resistance (e.g., Tricuspid stenosis, Pulmonary hypertension). In tamponade, the 'a' wave is usually preserved but not the defining feature. * **Absent 'a' wave:** This is a classic finding in **Atrial Fibrillation**, where there is no coordinated atrial contraction. * **Prominent 'y' descent:** This is a hallmark of **Constrictive Pericarditis** (Friedreich’s sign), where the rigid pericardium allows rapid early filling but stops it abruptly [3]. This "dip and plateau" pattern distinguishes constriction from tamponade. **3. NEET-PG High-Yield Pearls:** * **The "X" Factor:** In tamponade, the **'x' descent is preserved or prominent** (due to the heart moving downward during systole, creating space), while the 'y' descent is absent. * **Beck’s Triad:** Hypotension, JVD, and Muffled heart sounds [1]. * **Pulsus Paradoxus:** A drop in systolic BP >10 mmHg during inspiration [1]. * **ECG Finding:** Electrical alternans (swinging heart) [2]. * **Kussmaul’s Sign:** Usually **absent** in tamponade but **present** in constrictive pericarditis and Right Ventricular MI.

Question 844: A 72-year-old male presented to the ER with falls. Based on the provided ECG interpretation, what is the likely diagnosis?

A. Hyperkalemia
B. Second-degree heart block, Mobitz Type 2
C. First-degree heart block
D. Second-degree heart block, Mobitz Type 1 (Correct Answer)

Explanation: ***Second-degree heart block, Mobitz Type 1*** - Characterized by **progressive PR interval prolongation** until a **QRS complex is dropped**, followed by **reset of the cycle** (Wenckebach phenomenon). - Falls in elderly patients occur due to **intermittent bradycardia** and **transient hemodynamic compromise** from dropped beats. *Hyperkalemia* - ECG shows **peaked T waves**, **widened QRS complexes**, and eventually **sine wave pattern** in severe cases. - Does not typically cause **progressive PR prolongation** with **dropped beats** as seen in this scenario. *Second-degree heart block, Mobitz Type 2* - Features **constant PR intervals** with **sudden dropping** of QRS complexes without prior prolongation. - More dangerous than Type 1 as it can **progress to complete heart block** and requires **immediate pacing**. *First-degree heart block* - Shows **prolonged PR interval** (>200ms) but **all P waves are conducted** to the ventricles. - Does not involve **dropped QRS complexes** and typically does not cause falls or hemodynamic instability.

Question 845: What is the characteristic cardiac anomaly associated with Lutembacher syndrome?

A. Mitral stenosis
B. Atrial septal defect
C. Ventricular septal defect (Correct Answer)
D. Left to right shunt

Explanation: Lutembacher Syndrome is a specific clinical entity defined by the combination of acquired Mitral Stenosis (MS) [2] and a congenital Atrial Septal Defect (ASD) [4]. **Why the provided answer (C) is technically incorrect based on standard medical definitions:** In standard medical literature, Lutembacher syndrome consists of Mitral Stenosis + Atrial Septal Defect. If the question identifies Ventricular Septal Defect (VSD) as the "correct" answer, it likely represents a common error in specific question banks or a mislabeled option. Classically, a VSD is *not* a component of Lutembacher syndrome [1], [3]. **Analysis of Options:** * **A & B (Mitral Stenosis & Atrial Septal Defect):** These are the two classic components. The ASD (usually ostium secundum) provides a "decompression" route for the high left atrial pressure caused by MS, leading to an early and severe left-to-right shunt [4]. * **C (Ventricular Septal Defect):** This is traditionally incorrect. However, if forced to choose in a flawed question paper, ensure you recall the classic MS + ASD triad. * **D (Left to Right Shunt):** This is a *hemodynamic consequence* of the syndrome, not the anatomical anomaly itself. **NEET-PG High-Yield Pearls:** 1. **Hemodynamics:** The ASD protects the lungs from pulmonary congestion initially by shunting blood from the LA to the RA, but this leads to early **Right Ventricular Failure** and pulmonary hypertension [2]. 2. **Clinical Sign:** The typical diastolic murmur of MS (mid-diastolic rumble) is often **diminished or absent** because the ASD reduces the pressure gradient across the mitral valve [2]. 3. **Graham Steell Murmur:** May be present due to secondary pulmonary regurgitation from pulmonary hypertension. 4. **Treatment:** Percutaneous management (Balloon Mitral Valvotomy + Device closure of ASD) is now the preferred approach.

Question 846: Which of the following is true about sinus tachycardia?

A. Fixed PR interval
B. Gradual in onset
C. Uniform P wave
D. All of the above (Correct Answer)

Explanation: ### Explanation Sinus tachycardia is a physiological or pathological response where the heart rate exceeds 100 beats per minute, originating from the **Sinoatrial (SA) node** [1]. **Why "All of the above" is correct:** 1. **Gradual in Onset (Option B):** Unlike Paroxysmal Supraventricular Tachycardia (PSVT), which starts and ends abruptly, sinus tachycardia is characterized by a **gradual "warm-up" and "cool-down" phase**. It occurs in response to triggers like exercise, fever, or anxiety, where the heart rate climbs and descends progressively [1]. 2. **Uniform P wave (Option C):** Since the impulse originates from the SA node, the P-wave morphology remains identical to the patient’s normal sinus rhythm. The P waves are typically upright in leads I, II, and aVF. 3. **Fixed PR interval (Option A):** In sinus tachycardia, the conduction through the AV node remains stable; therefore, the PR interval is constant (though it may physiologically shorten slightly at very high rates, it does not vary beat-to-beat like in some arrhythmias). **Clinical Pearls for NEET-PG:** * **Maximum Heart Rate:** Can be estimated as $220 - \text{age}$. * **Common Causes:** Pain, fever, hypovolemia, hyperthyroidism, anemia, and pulmonary embolism [1]. * **Distinguishing Feature:** The most important differentiator from PSVT is the **gradual onset/offset** and the presence of a **normal P-wave axis**. * **Treatment:** Always treat the **underlying cause** (e.g., fluids for dehydration, paracetamol for fever) rather than using rhythm-controlling drugs primarily [1].

Question 847: Pulsus paradoxus is seen in which of the following conditions?

A. Emphysema (Correct Answer)
B. Infective endocarditis
C. Mitral stenosis
D. Hypertrophic cardiomyopathy

Explanation: **Explanation:** **Pulsus paradoxus** is defined as an exaggerated decrease in systolic blood pressure (>10 mmHg) during inspiration. While most commonly associated with cardiac tamponade, it is also a classic finding in severe obstructive airway diseases like **Emphysema** and Asthma. **Why Emphysema is correct:** In Emphysema, hyperinflation of the lungs and increased airway resistance lead to extreme fluctuations in intrathoracic pressure. During inspiration, the highly negative intrathoracic pressure increases venous return to the right heart, causing the interventricular septum to bulge into the left ventricle (Bernheim effect). Simultaneously, the negative pressure "pools" blood in the expanded pulmonary vasculature, reducing left ventricular filling and stroke volume, thus dropping the systolic BP. **Why the other options are incorrect:** * **Infective Endocarditis:** Typically presents with murmurs, fever, and embolic phenomena (Janeway lesions, Osler nodes), but does not affect intrathoracic pressure dynamics to cause pulsus paradoxus. * **Mitral Stenosis:** Characterized by a mid-diastolic murmur and opening snap. It does not typically cause pulsus paradoxus; in fact, it may be associated with *pulsus parvus* (small volume pulse). * **Hypertrophic Cardiomyopathy (HCM):** Classically associated with **Pulsus Bisferiens** (a double-peaked systolic pulse). **High-Yield Clinical Pearls for NEET-PG:** * **Kussmaul’s Sign vs. Pulsus Paradoxus:** Kussmaul’s sign (rise in JVP on inspiration) is seen in Constrictive Pericarditis, whereas Pulsus Paradoxus is the hallmark of Cardiac Tamponade. * **Reverse Pulsus Paradoxus:** Seen in Hypertrophic Obstructive Cardiomyopathy (HOCM) and during positive pressure ventilation. * **Conditions with Pulsus Paradoxus:** Cardiac tamponade, Severe Asthma/COPD, Constrictive pericarditis (only in ~30%), and Massive Pulmonary Embolism.

Question 848: Which of the following is seen in torsades de pointes?

A. Hypermagnesemia
B. Short QRS complex
C. Prolonged QTc interval (Correct Answer)
D. PQ segment

Explanation: **Explanation:** **Torsades de Pointes (TdP)** is a specific form of polymorphic ventricular tachycardia characterized by a "twisting of the points" around the isoelectric line [1]. 1. **Why Option C is correct:** The hallmark physiological prerequisite for TdP is a **prolonged QTc interval** [1]. Prolongation of the QT interval reflects delayed ventricular repolarization (usually due to blockade of potassium channels). This delay allows for "Early After-Depolarizations" (EADs), which can trigger a run of ventricular tachycardia. In clinical practice, a QTc > 500 ms is considered a high-risk zone for developing TdP. 2. **Why other options are incorrect:** * **Option A:** TdP is associated with **Hypomagnesemia**, not hypermagnesemia. Magnesium is the treatment of choice because it stabilizes the cardiac membrane. * **Option B:** TdP is a ventricular rhythm, which by definition involves a **wide QRS complex** (polymorphic), not a short one. * **Option D:** The PQ segment (part of the PR interval) relates to AV nodal conduction and is not the primary diagnostic feature of TdP. **High-Yield Clinical Pearls for NEET-PG:** * **Etiology:** Can be congenital (Jervell and Lange-Nielsen, Romano-Ward syndromes) or acquired (Drugs like Class IA/III antiarrhythmics, Macrolides, Antipsychotics, or electrolyte imbalances like Hypokalemia/Hypomagnesemia). * **Drug of Choice:** **Intravenous Magnesium Sulfate** is the first-line treatment, even if serum magnesium levels are normal. * **ECG Feature:** Look for the characteristic "spindle-node" pattern where the QRS axis rotates 180° over 5–20 beats [1].

Question 849: A 20-year-old female patient presents with non-exertional chest pain. On auscultation, she has multiple non-ejection clicks. What is the investigation of choice?

A. Serum markers
B. Chest X-ray
C. Electrocardiography
D. Echocardiography (Correct Answer)

Explanation: ### Explanation **Diagnosis: Mitral Valve Prolapse (MVP)** The clinical presentation of a young female with non-exertional chest pain and **multiple non-ejection clicks** is classic for **Mitral Valve Prolapse (MVP)**, also known as Barlow’s Syndrome. **1. Why Echocardiography is the Correct Answer:** Echocardiography is the **gold standard and investigation of choice** for MVP. It allows for the definitive visualization of the mitral valve leaflets billowing into the left atrium during systole (defined as >2 mm displacement beyond the annular plane) [1]. It also assesses the severity of associated mitral regurgitation (MR) and chordal integrity. **2. Why Other Options are Incorrect:** * **Serum Markers (Troponins/CK-MB):** These are used to diagnose myocardial infarction. While the patient has chest pain, the auscultatory findings point toward a structural valvular issue rather than acute coronary syndrome. * **Chest X-ray:** Usually normal in MVP [1]. It may show cardiomegaly only if significant mitral regurgitation has led to left-sided heart failure [2], making it non-specific for diagnosis. * **Electrocardiography (ECG):** While ECG may show non-specific T-wave inversions in inferior leads in some MVP patients, it cannot confirm the diagnosis. **3. High-Yield Clinical Pearls for NEET-PG:** * **Auscultation:** The hallmark is a **Mid-systolic click** followed by a late systolic murmur. Multiple clicks suggest redundant valve tissue. * **Dynamic Auscultation:** Any maneuver that **decreases Left Ventricular (LV) volume** (e.g., Standing, Valsalva) causes the click/murmur to occur **earlier** in systole. Maneuvers that increase LV volume (e.g., Squatting, Handgrip) delay the click/murmur. * **Associations:** Often associated with connective tissue disorders like **Marfan Syndrome** and Ehlers-Danlos Syndrome. * **Most Common Cause:** Myxomatous degeneration of the mitral valve.

Question 850: Which of the following is NOT true regarding Wolff-Parkinson-White (WPW) syndrome?

A. It is more common in females. (Correct Answer)
B. Right ventricular aberrant conduction is commonly seen.
C. Incidence decreases with age.
D. The His-Purkinje system is structurally normal.

Explanation: Wolff-Parkinson-White (WPW) syndrome is a pre-excitation syndrome caused by an accessory pathway (Bundle of Kent) that bypasses the AV node, directly connecting the atria and ventricles [1]. **Why Option A is the correct answer (False statement):** WPW syndrome is significantly **more common in males** than in females (ratio approximately 2:1 or 3:1). Therefore, the statement that it is more common in females is incorrect. **Analysis of other options:** * **Option B:** In WPW, the impulse travels through the accessory pathway faster than the AV node, leading to early ventricular activation [1]. This results in **aberrant conduction** (manifesting as a Delta wave and widened QRS complex) [1], [2]. * **Option C:** The incidence of WPW **decreases with age**. This is due to the spontaneous loss of conduction properties in the accessory pathway (fibrosis or atrophy) or the disappearance of the characteristic ECG pattern over time. * **Option D:** The **His-Purkinje system is structurally normal** in WPW. The pathology lies in the existence of an extra-nodal accessory muscular bridge [1], not in the intrinsic specialized conduction system. **High-Yield Clinical Pearls for NEET-PG:** 1. **Classic ECG Triad:** Short PR interval (<0.12s), Delta wave (slurred upstroke of QRS), and widened QRS complex (>0.12s) [1]. 2. **Association:** Most cases are sporadic, but it is strongly associated with **Ebstein’s Anomaly** (usually right-sided accessory pathways). 3. **Drug Contraindication:** Avoid **ABCD** (Atropine/Adenosine, Beta-blockers, Calcium channel blockers, Digoxin) in WPW with Atrial Fibrillation, as they block the AV node and may cause fatal ventricular fibrillation via the accessory pathway [2]. 4. **Treatment of Choice:** Radiofrequency Catheter Ablation of the accessory pathway.

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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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Cardiology — MCQs

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