Cardiology Practice Questions

Q: All of the following statements about Brugada syndrome are true, EXCEPT:

Flecainide can be used for treatment.. Brugada Syndrome is an autosomal dominant genetic channelopathy, most commonly involving a mutation in the **SCN5A gene** (sodium channel). It is a leading cause of sudden cardiac death in young individuals with structurally normal hearts. **Why Option D is the Correct Answer (The Exception):** Flecainide is a Class IC antiarrhythmic that blocks sodium channels. In Brugada syndrome, sodium channel blockers **unmask or worsen** the characteristic ECG pattern and can actually **precipitate** fatal arrhythmias. Therefore, Flecainide is used as a *provocative diagnostic test* (the Flecainide challenge) to reveal the Brugada pattern, but it is strictly **contraindicated for treatment**. The only proven effective treatment for preventing sudden death in high-risk patients is an **Implantable Cardioverter Defibrillator (ICD)**. **Analysis of Other Options:** * **Option A:** The hallmark of Brugada is a pseudo-right bundle branch block and **ST-segment elevation in leads V1-V3**. This pattern can be transient and may be triggered by fever or certain drugs. * **Option B:** It is the primary cause of **Sudden Unexpected Nocturnal Death Syndrome (SUNDS)**, particularly prevalent in young Southeast Asian males. * **Option C:** There is a significantly high risk of **polymorphic ventricular tachycardia** and ventricular fibrillation, which often occurs during sleep or rest. **High-Yield Clinical Pearls for NEET-PG:** * **ECG Patterns:** Type 1 (Coved-type ST elevation ≥2mm) is the only diagnostic pattern. * **Inheritance:** Autosomal Dominant; SCN5A gene mutation (loss of function). * **Triggers:** Fever is a major trigger for arrhythmias; aggressive antipyretic therapy is essential. * **Pharmacotherapy:** While ICD is the gold standard, **Quinidine** (Class IA) can be used as an adjunct to reduce arrhythmia frequency because it also blocks Ito channels.

Q: Differential cyanosis occurs in which of the following conditions?

Patent Ductus Arteriosus (PDA). **Explanation:** **Differential cyanosis** refers to a clinical state where cyanosis is present in the lower extremities but absent in the upper extremities (specifically the right arm). **Why PDA is the correct answer:** In a patient with a large **Patent Ductus Arteriosus (PDA)**, chronic left-to-right shunting leads to pulmonary hypertension and eventually **Eisenmenger syndrome** (reversal of shunt to right-to-left). Because the PDA typically joins the aorta *distal* to the origin of the left subclavian artery (or just distal to the brachiocephalic trunk), deoxygenated blood from the pulmonary artery enters the descending aorta. This results in cyanosis and clubbing of the toes, while the right upper limb remains pink (pre-ductal). **Why the other options are incorrect:** * **TGA:** Typically presents with global cyanosis. However, if a PDA is present, it can cause **Reverse Differential Cyanosis** (upper body cyanotic, lower body pink), as oxygenated blood from the LV enters the pulmonary artery and then the descending aorta via the PDA. * **Tricuspid Stenosis:** This is an obstructive right-sided lesion. If a shunt exists (like an ASD), it causes generalized cyanosis due to right-to-left shunting at the atrial level. * **VSD:** In Eisenmenger syndrome due to VSD, deoxygenated blood enters the ascending aorta, leading to uniform cyanosis in both upper and lower limbs. **High-Yield Clinical Pearls for NEET-PG:** * **Differential Cyanosis:** PDA with Eisenmenger syndrome or Coarctation of Aorta with PDA. * **Reverse Differential Cyanosis:** TGA with PDA and Pulmonary Hypertension or Supracardiac TAPVC. * **Site of PDA:** Usually located at the "isthmus" of the aorta, distal to the origin of the left subclavian artery.

Q: Massive hemoptysis in mitral stenosis originates from which of the following structures?

Pulmonary veins. **Explanation:** In Mitral Stenosis (MS), the narrowing of the mitral valve orifice leads to increased pressure in the Left Atrium (LA). This pressure is transmitted backward into the **Pulmonary Veins** and capillaries. The mechanism behind massive hemoptysis (historically termed **"Pulmonary Apoplexy"**) involves the collateral circulation between the pulmonary and bronchial venous systems. As pulmonary venous pressure rises, it causes retrograde congestion into the **bronchial veins**. These thin-walled submucosal bronchial veins become dilated and variceal. A sudden rise in left atrial pressure (often due to exertion or pregnancy) can cause these high-pressure varices to rupture into the bronchial lumen, resulting in profuse, bright red bleeding. **Analysis of Incorrect Options:** * **B. Pulmonary Artery:** While pulmonary arterial hypertension occurs in chronic MS, the arteries are thick-walled and do not typically rupture into the airways to cause massive hemoptysis. * **C. Bronchial Veins:** While these are the vessels that actually rupture, the *origin* of the pathology and the driving pressure is the **Pulmonary Venous system**. In the context of MS hemodynamics, "Pulmonary Veins" is the standard academic answer for the source of the pressure overload. * **D. Bronchial Artery:** This is the most common source of massive hemoptysis in conditions like **Bronchiectasis** or Tuberculosis, but not in Mitral Stenosis. **High-Yield Clinical Pearls for NEET-PG:** * **Pink Frothy Sputum:** Indicates acute pulmonary edema (rupture of alveolar capillaries), not massive hemoptysis. * **Rusty Sputum:** Seen in MS due to "heart failure cells" (hemosiderin-laden macrophages) in the alveoli. * **Ortner’s Syndrome:** Hoarseness of voice in MS due to compression of the Left Recurrent Laryngeal nerve by an enlarged Left Atrium.

Q: Beck's triad is a clinical feature of which of the following conditions?

Cardiac tamponade. **Explanation:** **Beck’s Triad** is a classic clinical sign pathognomonic for **Cardiac Tamponade**. It occurs when fluid accumulates in the pericardial sac under high pressure, compressing the heart chambers and preventing adequate diastolic filling [1]. This leads to the three components of the triad: 1. **Hypotension:** Due to decreased stroke volume and cardiac output. 2. **Jugular Venous Distension (JVD):** Due to impaired venous return to the right atrium. 3. **Muffled Heart Sounds:** Due to the insulating effect of the pericardial fluid. **Analysis of Incorrect Options:** * **A. Constrictive Pericarditis:** While it presents with JVD and signs of right heart failure, it is characterized by the **Kussmaul sign** (paradoxical rise in JVP on inspiration) and a **pericardial knock** [2], rather than the acute hypotension seen in Beck's triad. * **C. Pulmonary Embolism:** Presents with sudden onset dyspnea, pleuritic chest pain, and tachycardia. While severe cases (Saddle PE) cause hypotension and JVD, heart sounds remain clear. * **D. Acute Bronchial Asthma:** Characterized by expiratory wheezing and prolonged expiration. While it can cause **Pulsus Paradoxus**, it does not present with the components of Beck's triad. **High-Yield Clinical Pearls for NEET-PG:** * **Pulsus Paradoxus:** Defined as a drop in systolic BP >10 mmHg during inspiration. It is a key finding in Tamponade but is *absent* in Constrictive Pericarditis (except in rare cases). * **ECHO Findings:** The gold standard for diagnosis; look for **diastolic collapse** of the right ventricle and right atrium [1]. * **ECG Findings:** Look for **Electrical Alternans** (varying QRS amplitude) and low-voltage complexes [1]. * **Management:** The immediate treatment of choice is **emergency pericardiocentesis** [1].

Q: A 62-year-old man with a history of hypertension presents with severe left chest and back pain. His blood pressure is 80/50 mm Hg. Physical examination reveals pallor, diaphoresis, and a murmur of aortic regurgitation. An ECG shows no myocardial infarction. A chest X-ray reveals mediastinal widening. Which of the following is the most likely diagnosis?

Dissecting aneurysm. The clinical presentation of sudden-onset, severe chest and back pain (often described as "tearing") in a hypertensive patient, coupled with **mediastinal widening** on chest X-ray, is classic for **Aortic Dissection (Dissecting Aneurysm)** [1]. The presence of **hypotension (80/50 mm Hg)** and a **murmur of aortic regurgitation** suggests a Stanford Type A dissection involving the ascending aorta [1]. Hypotension in this context is a surgical emergency, often indicating complications like cardiac tamponade, severe aortic insufficiency, or rupture. The absence of MI changes on ECG helps rule out a primary coronary event, although dissection can occasionally involve the coronary ostia. **Why other options are incorrect:** * **Bacterial Endocarditis:** Typically presents with fever, weight loss, and peripheral stigmata (Janeway lesions, Osler nodes). While it causes murmurs, it does not cause acute "tearing" back pain or mediastinal widening. * **Pericarditis:** Characterized by pleuritic chest pain that improves upon leaning forward. ECG would typically show diffuse ST-segment elevation and PR depression, not mediastinal widening. * **Pulmonary Thromboembolism:** Presents with dyspnea, pleuritic chest pain, and tachycardia. While it can cause hypotension (Massive PE), it does not cause a new aortic regurgitation murmur or mediastinal widening. **High-Yield Pearls for NEET-PG:** * **Risk Factors:** Hypertension (most common), Marfan syndrome, and Bicuspid aortic valve [1]. * **Gold Standard Investigation:** CT Angiography (stable patients) or Transesophageal Echocardiogram (unstable patients) [1]. * **Management:** Type A (Ascending) requires **emergency surgery**; Type B (Descending) is generally managed **medically** with IV beta-blockers (Labetalol) to reduce heart rate and shear stress (dP/dt).

Q: What is considered a tri-fascicular block?

None of the above. ### **Explanation** The term **Trifascicular Block** is often misunderstood. In clinical practice and for NEET-PG, it refers to a condition where all three conduction pathways of the ventricles are affected. **Why "None of the above" is correct:** A true trifascicular block consists of a **Bifascicular block PLUS a 1st-degree AV block**. The three fascicles involved are: 1. Right Bundle Branch (RBB) 2. Left Anterior Fascicle (LAF) 3. Left Posterior Fascicle (LPF) **Analysis of Options:** * **Option A:** LAH + LPH is equivalent to a **Left Bundle Branch Block (LBBB)**, as both fascicles of the left side are blocked [2]. * **Options B & C:** These represent **Bifascicular Blocks** [2]. * RBBB + LAH = Bifascicular block. * RBBB + LPH = Bifascicular block. To make these "trifascicular," an additional delay in the remaining fascicle (manifesting as a prolonged PR interval/1st-degree AV block) must be present. **Clinical Pearls for NEET-PG:** 1. **Bifascicular Block:** The most common pattern is **RBBB + Left Anterior Hemiblock (LAHB)** because the anterior fascicle is thin and has a single blood supply (LAD) [2]. 2. **RBBB + Left Posterior Hemiblock (LPHB):** This is rarer and more concerning, as the posterior fascicle is thick and has a dual blood supply (RCA and LCX). Its presence suggests extensive conduction system disease. 3. **Management:** Asymptomatic trifascicular block generally does not require a pacemaker [1]. However, if it progresses to **Complete Heart Block (3rd-degree AV block)** or causes syncope, a permanent pacemaker (PPI) is indicated [1]. 4. **Alternating Bundle Branch Block:** (RBBB and LBBB appearing at different times) is also considered a form of trifascicular block and is a high-risk sign for sudden cardiac arrest.

Question 1

What is the most common cause of morbidity and mortality late in the course of mitral stenosis?

Accepted Answer

Recurrent pulmonary emboli

Answer

Infective endocarditis

Answer

Pulmonary edema

Answer

Pulmonary infections

Question 2

All of the following statements about Brugada syndrome are true, EXCEPT:

Accepted Answer

Flecainide can be used for treatment.

Answer

Transient ST segment elevation in leads V1-V3 is seen.

Answer

It is responsible for the sudden and unexpected nocturnal death syndrome.

Answer

The risk of fatal ventricular arrhythmia is high.

Question 3

Differential cyanosis occurs in which of the following conditions?

Accepted Answer

Patent Ductus Arteriosus (PDA)

Answer

Transposition of the Great Arteries (TGA)

Answer

Tricuspid stenosis

Answer

Ventricular Septal Defect (VSD)

Question 4

Which of the following statement is incorrect about hypertrophic cardiomyopathy?

Accepted Answer

Adapted mitral valve results in anteriorly directed mitral regurgitation.

Answer

Interventricular septum shows maximum hypertrophy.

Answer

30% of cases show obstruction at rest.

Answer

Systolic dysfunction arises due to mitral valve displacement.

Question 5

Massive hemoptysis in mitral stenosis originates from which of the following structures?

Accepted Answer

Pulmonary veins

Answer

Pulmonary artery

Answer

Bronchial veins

Answer

Bronchial artery

Question 6

Which of the following statements regarding atrioventricular block with atrial tachycardia is true?

Accepted Answer

Seen in digitalis toxicity with potassium depletion

Answer

Seen in Wolff-Parkinson-White syndrome

Answer

Is a complication of pacemaker therapy

Answer

Can occur in a normal individual occasionally

Question 7

A patient with prolonged immobilization in the Intensive Care Unit (ITU) developed sudden severe tricuspid regurgitation. What is the immediate management?

Accepted Answer

IV heparin

Answer

D-dimer assay

Answer

Angiography

Answer

Recombinant tissue plasminogen activator (rtPA)

Question 8

Beck's triad is a clinical feature of which of the following conditions?

Accepted Answer

Cardiac tamponade

Answer

Constrictive pericarditis

Answer

Pulmonary embolism

Answer

Acute bronchial asthma

Question 9

A 62-year-old man with a history of hypertension presents with severe left chest and back pain. His blood pressure is 80/50 mm Hg. Physical examination reveals pallor, diaphoresis, and a murmur of aortic regurgitation. An ECG shows no myocardial infarction. A chest X-ray reveals mediastinal widening. Which of the following is the most likely diagnosis?

Accepted Answer

Dissecting aneurysm

Answer

Bacterial endocarditis

Answer

Pericarditis

Answer

Pulmonary thromboembolism

Question 10

What is considered a tri-fascicular block?

Accepted Answer

None of the above

Answer

Left Anterior hemi block (LAH) and Left Posterior hemi block (LPH)

Answer

Right Bundle Branch Block (RBBB) and Left Anterior hemi block (LAH)

Answer

Right Bundle Branch Block (RBBB) and Left Posterior hemi block (PAH)

Cardiology — MCQs

Cardiology — MCQs

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