Cardiology Practice Questions

Q: A 35-year-old athlete has height 184 cm, arm span 194 cm, pulse rate 64/min, and BP 148/64 mm Hg. Chest auscultation reveals a long diastolic murmur over the right second intercostal space on routine examination. What is the probable diagnosis?

Aortic regurgitation. ### Explanation The clinical presentation points toward **Marfan Syndrome** complicated by **Aortic Regurgitation (AR)**. **1. Why Aortic Regurgitation is correct:** * **Marfanoid Habitus:** The patient’s arm span (194 cm) exceeds his height (184 cm), a classic sign of Marfan syndrome (Arm span to height ratio >1.05). * **Hemodynamics:** A BP of 148/64 mm Hg shows a **wide pulse pressure** (84 mm Hg), characteristic of AR due to a large stroke volume and rapid diastolic runoff [1]. * **Auscultation:** A **long diastolic murmur** at the right second intercostal space (the aortic area) is the hallmark of AR, often resulting from aortic root dilation in Marfan patients [2]. **2. Why the other options are incorrect:** * **Atrial Septal Defect (ASD):** Typically presents with a fixed splitting of the second heart sound (S2) and a systolic ejection murmur over the pulmonary area, not a diastolic murmur. * **Ebstein Anomaly:** Characterized by tricuspid regurgitation (holosystolic murmur) and right-sided heart failure; it is not associated with Marfanoid habitus or wide pulse pressure. * **Coarctation of Aorta:** Presents with upper limb hypertension and radio-femoral delay. The murmur is usually systolic and heard best over the back (infrascapular region). **3. High-Yield Clinical Pearls for NEET-PG:** * **Marfan Syndrome:** An autosomal dominant defect in the **FBN1 gene** (Fibrillin-1) on Chromosome 15. * **Aortic Root Dilation:** The most common cardiovascular complication in Marfan syndrome, leading to AR or Aortic Dissection [2]. * **Peripheral Signs of AR:** Look for Quincke’s pulse (capillary pulsations), Corrigan’s pulse (water-hammer), and de Musset’s sign (head nodding). * **Murmur Localization:** While AR is usually heard at the left sternal border (Erb’s point), AR due to **aortic root pathology** (like Marfan’s) is often loudest at the **right sternal border**.

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: All of the following are indicated in the management of a patient with the given ECG findings, except?

Sodium bicarbonate. ***Sodium bicarbonate*** - **NOT routinely indicated** in ventricular fibrillation cardiac arrest management unless specific conditions like **hyperkalemia** or **tricyclic antidepressant overdose** are present. - Can worsen **intracellular acidosis** and cause **hyperosmolarity**, potentially reducing the effectiveness of resuscitation efforts. *CPR for 60-90 seconds* - In older **ACLS protocols**, CPR for 60-90 seconds was recommended before attempting defibrillation in **witnessed VF arrest**. - Provides **coronary perfusion pressure** and **cerebral blood flow** to optimize the chance of successful defibrillation. *Epinephrine* - **Alpha-adrenergic effects** increase coronary and cerebral perfusion pressure during CPR in **VF/VT cardiac arrest**. - Standard dose is **1 mg IV/IO** every 3-5 minutes during cardiac arrest resuscitation. *Vasopressin* - **Vasoconstrictor** that increases coronary and cerebral perfusion pressure, similar to epinephrine in cardiac arrest. - Can be used as an alternative to epinephrine in **VF/VT cardiac arrest** with dose of **40 units IV/IO**.

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.

Q: Which of the following is false regarding the Austin-Flint murmur?

It is a systolic murmur.. The **Austin-Flint murmur** is a classic physical finding in cardiology, and understanding its mechanism is high-yield for NEET-PG. ### **Explanation of the Correct Answer** **Option A is FALSE** because the Austin-Flint murmur is a **mid-to-late diastolic murmur**, not a systolic one [1]. It occurs during the filling phase of the heart. The murmur is produced when a severe **Aortic Regurgitation (AR)** jet flows back into the left ventricle and strikes the **anterior leaflet of the mitral valve** [1]. This causes the leaflet to vibrate and partially close, creating a functional (relative) mitral stenosis. Since it mimics the flow pattern of mitral stenosis, it occurs during diastole. ### **Analysis of Other Options** * **Option B:** It is indeed associated with **severe, chronic aortic regurgitation** [1]. The volume of the regurgitant jet must be significant enough to displace the mitral leaflet. * **Option C:** The anatomical site of origin is the **anterior mitral valve leaflet** [1]. The regurgitant jet from the aorta pushes this leaflet upward, narrowing the mitral orifice. * **Option D:** It is frequently **confused with mitral stenosis (MS)** because both are low-pitched diastolic rumbles heard at the apex [2]. However, Austin-Flint lacks the "opening snap" and loud S1 characteristic of organic MS. ### **Clinical Pearls for NEET-PG** * **Differentiation:** To distinguish Austin-Flint from Mitral Stenosis, use **Amyl Nitrite**. Amyl nitrite decreases peripheral resistance, reducing AR and softening the Austin-Flint murmur. Conversely, it increases cardiac output, which makes the murmur of true MS louder. * **Location:** Best heard at the **apex** with the bell of the stethoscope [2]. * **Mechanism:** It is a "functional" murmur, meaning the mitral valve itself is structurally normal [1].

Question 1

A 35-year-old athlete has height 184 cm, arm span 194 cm, pulse rate 64/min, and BP 148/64 mm Hg. Chest auscultation reveals a long diastolic murmur over the right second intercostal space on routine examination. What is the probable diagnosis?

Accepted Answer

Aortic regurgitation

Answer

Atrial septal defect

Answer

Ebstein anomaly

Answer

Coarctation of aorta

Question 2

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

Accepted Answer

Amyloidosis

Answer

Alcohol

Answer

Hemochromatosis

Answer

Sarcoidosis

Question 3

All of the following are indicated in the management of a patient with the given ECG findings, except?

Accepted Answer

Sodium bicarbonate

Answer

CPR for 60-90 seconds

Answer

Epinephrine

Answer

Vasopressin

Question 4

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 5

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 6

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

Accepted Answer

2D Echocardiography

Answer

Ultrasound (USG)

Answer

CT Scan

Answer

MRI Scan

Question 7

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

Accepted Answer

Hypomagnesemia

Answer

Hyponatremia

Answer

Hypercalcemia

Answer

Hypothermia

Question 8

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 9

What is the initial management of newly diagnosed hypertension?

Accepted Answer

Lifestyle modification

Answer

ACE inhibitors

Answer

Beta-blockers

Answer

Diuretics

Question 10

Which of the following is false regarding the Austin-Flint murmur?

Accepted Answer

It is a systolic murmur.

Answer

It is associated with severe aortic regurgitation.

Answer

It originates at the anterior mitral valve leaflet.

Answer

It may be confused with the murmur of mitral stenosis.

Cardiology — MCQs

Cardiology — MCQs

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