Cardiology Practice Questions

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.

Q: A third heart sound is heard in all of the following conditions except:

Mitral stenosis. Explanation: The **Third Heart Sound (S3)**, also known as a ventricular gallop, occurs during the early phase of diastole (rapid ventricular filling). It is caused by the sudden deceleration of blood flow into a dilated or non-compliant ventricle. **Why Mitral Stenosis is the Correct Answer:** In **Mitral Stenosis (MS)**, the mitral valve is narrowed, which physically obstructs the flow of blood from the left atrium to the left ventricle [2]. Because the rate of ventricular filling is significantly slowed and restricted, the rapid filling phase required to produce an S3 does not occur. Instead, MS is characterized by an **Opening Snap (OS)** and a mid-diastolic murmur [1][2]. **Analysis of Incorrect Options:** * **Athletes:** S3 is a normal physiological finding in children, young adults, and well-trained athletes due to high cardiac output and rapid ventricular filling in a healthy, compliant heart. * **Constrictive Pericarditis:** This condition produces a variant of S3 known as a **Pericardial Knock**. It occurs when the rigid pericardium abruptly halts early diastolic filling. * **Myocardial Infarction:** In the setting of an MI, ventricular wall motion abnormality or acute heart failure leads to increased end-systolic volume and decreased compliance, making the S3 a classic sign of left ventricular dysfunction. **High-Yield Clinical Pearls for NEET-PG:** * **S3 vs. S4:** S3 occurs during *early* diastole (rapid filling); S4 occurs during *late* diastole (atrial contraction). * **The "Kentucky" Gallop:** S3 is best heard with the bell of the stethoscope at the apex in the left lateral decubitus position. * **Pathological S3:** In adults over age 40, an S3 is usually the first clinical sign of **congestive heart failure**. * **Rule of Thumb:** S3 is associated with **volume overload** (e.g., MR, AR, VSD), whereas S4 is associated with **pressure overload/stiff ventricles** (e.g., AS, Hypertension).

Question 1

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 2

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 3

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 4

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 5

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)

Question 6

A third heart sound is heard in all of the following conditions except:

Accepted Answer

Mitral stenosis

Answer

Athletes

Answer

Constrictive pericarditis

Answer

Myocardial infarction

Question 7

Which of the following vessels is most commonly affected by atherosclerosis?

Accepted Answer

Left Anterior Descending Artery (LAD)

Answer

Left Circumflex Artery (LCX)

Answer

Right Coronary Artery (RCA)

Answer

Diagonal branch of LAD

Question 8

A 30-year-old male presents with a history of acute breathlessness. His JVP shows an inspiratory fall in blood pressure by 14 mmHg. What is true about this condition?

Accepted Answer

Pulsus paradoxus

Answer

Kussmaul sign

Answer

Rapidly descending pulse

Answer

An inspiratory fall of systemic blood pressure of more than 10 mmHg

Question 9

A 19-year-old male presents for a routine physical examination before playing for a college basketball team. He takes no medications and has no known allergies. His family history is notable for sudden cardiac death in his father and uncle around the age of 40. He is 195 cm tall and weighs 92 kg. On physical examination, he has pectus excavatum, arachnodactyly, and a high-arched palate. He wears glasses for severe myopia and has ectopia lentis on the right. A diastolic murmur is heard in the left third intercostal space. What advice should be given to him?

Accepted Answer

He is not safe for further competitive basketball or other strenuous physical activities.

Answer

He is safe to resume physical activity without further evaluation.

Answer

He may continue to practice with the team while further evaluation with an echocardiogram, slit lamp examination, and genetic testing is performed.

Answer

He should be placed on a beta-blocker and then can resume physical activity.

Question 10

True regarding atrial fibrillation?

Accepted Answer

Digoxin treatment

Answer

Increased thromboembolism

Answer

Anticoagulant not required

Answer

Aspirin given

Cardiology — MCQs

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