Cardiology Practice Questions

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.

Q: Which of the following is the most common identifiable cause for restrictive cardiomyopathy?

Amyloidosis. Explanation: **Amyloidosis** is the most common identifiable cause of restrictive cardiomyopathy (RCM). The underlying pathophysiology involves the extracellular deposition of insoluble amyloid fibrils (misfolded proteins) within the myocardial interstitium. This leads to increased ventricular wall thickness and stiffness, resulting in impaired diastolic filling (diastolic dysfunction) while systolic function is often preserved until late stages. On echocardiography, this classically presents as a "speckled" or "granular" myocardial appearance. **Analysis of Incorrect Options:** * **Alcohol (A):** This is a common cause of **Dilated Cardiomyopathy (DCM)**, not restrictive [1]. It leads to toxic injury of myocytes and ventricular enlargement [1]. * **Hemochromatosis (B):** While iron overload can cause RCM, it more frequently presents as **Dilated Cardiomyopathy**. It is a less common cause of RCM compared to amyloidosis. * **Sarcoidosis (D):** This is an infiltrative disease that can cause RCM due to non-caseating granulomas; however, it is statistically less common than amyloidosis and often presents with conduction blocks or arrhythmias. **High-Yield Clinical Pearls for NEET-PG:** * **Kussmaul’s Sign:** A paradoxical rise in JVP during inspiration, frequently seen in RCM. * **ECG Paradox:** Amyloidosis often shows **low voltage complexes** on ECG despite the appearance of "thickened" ventricular walls on Echo (which is actually protein infiltration, not true hypertrophy). * **Endomyocardial Biopsy:** The gold standard for diagnosis; amyloid shows **Congo Red staining** with **apple-green birefringence** under polarized light. * **Differentiating RCM from Constrictive Pericarditis:** RCM typically has a higher BNP level and lacks the respiratory variation in mitral inflow velocities seen in pericarditis.

Q: Which of the following is NOT true regarding lifestyle modifications for managing essential hypertension as recommended by the American Heart Association (AHA)?

Low potassium diet. The correct answer is **A (Low potassium diet)** because the AHA and most international guidelines (like JNC and ESC) actually recommend **increased** dietary potassium intake (3,500–5,000 mg/day) for individuals with hypertension, provided they do not have advanced chronic kidney disease. Potassium helps lower blood pressure by promoting sodium excretion (natriuresis) and reducing vascular tone. **Analysis of other options:** * **B. Dietary sodium intake <1.5g/day:** The AHA recommends a goal of less than 1,500 mg/day of sodium for optimal blood pressure reduction, though a general reduction to <2,300 mg/day is the initial target. * **C. DASH diet:** The "Dietary Approaches to Stop Hypertension" diet is a cornerstone of management. It emphasizes fruits, vegetables, low-fat dairy, and reduced saturated fats [1]. * **D. Limit alcohol consumption:** Excessive alcohol raises BP [1]. Guidelines recommend limiting intake to ≤2 drinks/day for men and ≤1 drink/day for women. **High-Yield Clinical Pearls for NEET-PG:** * **Weight Loss:** The most effective non-pharmacological intervention for BP reduction (approx. 1 mmHg drop per 1 kg weight loss) [1]. * **Physical Activity:** Aim for 90–150 minutes of aerobic and/or dynamic resistance exercise per week [1]. * **Sodium-Potassium Ratio:** A high sodium-to-potassium ratio is a stronger predictor of hypertension risk than sodium intake alone. * **Contraindication:** High potassium intake is contraindicated in patients taking **ACE inhibitors, ARBs, or Potassium-sparing diuretics** if they have underlying renal impairment, due to the risk of life-threatening hyperkalemia.

Q: A patient with diabetes mellitus of 4 years duration presents with dizziness and a heart rate of 52 beats per minute. What is the probable cause?

Inferior wall myocardial infarction. **Explanation:** The correct answer is **Inferior Wall Myocardial Infarction (IWMI)**. **Why IWMI is the most probable cause:** In patients with Diabetes Mellitus, myocardial infarction often presents atypically (silent MI) due to autonomic neuropathy, meaning chest pain may be absent. Instead, patients present with "anginal equivalents" like dizziness, nausea, or syncope. The bradycardia (52 bpm) is a classic hallmark of IWMI. This occurs because: 1. **Nodal Artery Involvement:** The Right Coronary Artery (RCA) supplies the SA node (in 60% of people) and the AV node (in 90%). Ischemia to these nodes leads to sinus bradycardia or heart blocks. 2. **Bezold-Jarisch Reflex:** Stimulation of vagal afferent receptors in the inferior wall of the left ventricle triggers a reflex increase in parasympathetic tone, resulting in bradycardia and hypotension. **Analysis of Incorrect Options:** * **A. Hypoglycaemia:** Typically presents with **tachycardia** and diaphoresis due to a compensatory sympathoadrenal surge. * **C. Sick Sinus Syndrome:** While it causes bradycardia, it is usually a chronic, degenerative condition of the elderly. In an acute presentation of a diabetic patient, an ischemic event must be ruled out first. * **D. Autonomic Dysfunction:** While common in long-standing diabetes, it usually manifests as **resting tachycardia** (due to loss of vagal tone) and orthostatic hypotension, rather than acute symptomatic bradycardia. **NEET-PG Clinical Pearls:** * **Silent MI:** Always suspect MI in a diabetic, elderly, or female patient presenting with unexplained fatigue or dizziness. * **RCA Occlusion:** Look for ST elevation in leads II, III, and aVF. * **Management:** Bradycardia in IWMI is often transient and responds well to **Atropine**. If associated with Right Ventricular MI, avoid nitrates and give IV fluids.

Q: Which of the following conditions will predispose to the cardiac rhythm shown?

Hypomagnesemia. ***Hypomagnesemia*** - **Hypomagnesemia** prolongs the **QT interval** and predisposes to **Torsades de Pointes** by affecting cardiac ion channels and repolarization. - **Magnesium sulfate** is the first-line treatment for Torsades de Pointes, making this the most likely predisposing factor. *Hyponatremia* - **Hyponatremia** primarily affects neurological function and does not significantly impact **cardiac repolarization** or QT interval. - This electrolyte disturbance is not associated with **Torsades de Pointes** or ventricular arrhythmias. *Hypercalcemia* - **Hypercalcemia** actually **shortens the QT interval** by accelerating cardiac repolarization, which is protective against Torsades de Pointes. - This condition would make the patient less likely to develop the **polymorphic ventricular tachycardia** shown. *Hypothermia* - **Hypothermia** characteristically causes **Osborn J waves** (positive deflection after QRS complex) rather than Torsades de Pointes. - While hypothermia can cause arrhythmias, it does not typically predispose to **QT prolongation** and Torsades de Pointes.

Q: Which of the following is not a feature of right heart failure?

Basal crepitations. ### Explanation The fundamental concept in heart failure is the "backwards" transmission of pressure. In **Right Heart Failure (RHF)**, the right ventricle fails to pump blood effectively into the pulmonary circulation, leading to systemic venous congestion. **Why "Basal Crepitations" is the Correct Answer:** Basal crepitations (crackles) are a hallmark of **Left Heart Failure (LHF)** [1]. When the left ventricle fails, pressure increases in the left atrium and pulmonary veins, leading to pulmonary edema (fluid in the alveoli) [1]. This manifests clinically as crepitations [1]. In isolated RHF, the lungs are typically "clear" because the pathology is distal to the pulmonary circuit. **Analysis of Incorrect Options (Features of RHF):** * **Jugular Venous Distension (JVD):** This is the most sensitive clinical sign of RHF [3]. Increased right atrial pressure is transmitted directly to the internal jugular vein. * **Hepatomegaly:** Congestion of the systemic venous system leads to "nutmeg liver" (congestive hepatopathy). The liver becomes enlarged and often tender. * **Ascites:** Chronic systemic venous hypertension leads to fluid transudation into the peritoneal cavity. This is part of the spectrum of dependent edema seen in RHF [2]. **High-Yield Clinical Pearls for NEET-PG:** 1. **Most common cause of RHF:** The most common cause of right-sided heart failure is actually **Left-sided heart failure** (due to secondary pulmonary hypertension). 2. **Cor Pulmonale:** This refers to isolated RHF caused by primary pulmonary disease (e.g., COPD, Interstitial Lung Disease). 3. **Bernheim Effect:** A rare phenomenon where a severely hypertrophied interventricular septum (from LV overload) bulges into the RV, causing RHF symptoms despite normal RV function. 4. **Kussmaul’s Sign:** A paradoxical rise in JVP during inspiration, often seen in constrictive pericarditis or severe RHF.

Question 1

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 2

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 3

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

Question 4

Which of the following is the most common identifiable cause for restrictive cardiomyopathy?

Accepted Answer

Amyloidosis

Answer

Alcohol

Answer

Hemochromatosis

Answer

Sarcoidosis

Question 5

Which of the following is NOT true regarding lifestyle modifications for managing essential hypertension as recommended by the American Heart Association (AHA)?

Accepted Answer

Low potassium diet

Answer

Dietary sodium intake less than 1.5 grams per day

Answer

DASH diet

Answer

Limit alcohol consumption

Question 6

A patient with diabetes mellitus of 4 years duration presents with dizziness and a heart rate of 52 beats per minute. What is the probable cause?

Accepted Answer

Inferior wall myocardial infarction

Answer

Hypoglycaemia

Answer

Sick-sinus syndrome

Answer

Autonomic dysfunction

Question 7

What is the investigation of choice (IOC) for cardiac tamponade?

Accepted Answer

2D Echocardiography

Answer

Ultrasound (USG)

Answer

CT Scan

Answer

MRI Scan

Question 8

Which of the following conditions will predispose to the cardiac rhythm shown?

Accepted Answer

Hypomagnesemia

Answer

Hyponatremia

Answer

Hypercalcemia

Answer

Hypothermia

Question 9

Which of the following is not a feature of right heart failure?

Accepted Answer

Basal crepitations

Answer

Jugular venous distension

Answer

Hepatomegaly

Answer

Ascites

Question 10

What is the initial management of newly diagnosed hypertension?

Accepted Answer

Lifestyle modification

Answer

ACE inhibitors

Answer

Beta-blockers

Answer

Diuretics

Cardiology — MCQs

Cardiology — MCQs

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