Cardiology Practice Questions

Q: Pulsus bisferiens occurs in which of the following conditions?

All of the above. **Explanation:** **Pulsus Bisferiens** (from Latin *bis* meaning twice and *ferire* meaning to strike) is a physical finding where the arterial pulse has two distinct systolic peaks [1]. This occurs due to a rapid initial ejection of blood followed by a brief decline and a second tidal wave. **Why "All of the Above" is correct:** 1. **HOCM:** In HOCM, there is a rapid initial ejection (first peak), followed by a sudden obstruction of the left ventricular outflow tract (LVOT) due to Systolic Anterior Motion (SAM) of the mitral valve. This causes a temporary dip, followed by a second peak as the ventricle overcomes the obstruction. This is often called the **"Spike and Dome"** pulse. 2. **Aortic Regurgitation (AR):** The large stroke volume ejected rapidly into the aorta creates the first peak (percussion wave), while the reflected wave from the periphery creates the second peak (tidal wave) due to the high-volume state [1]. 3. **Combined AS and AR:** This is a classic cause. The AR provides a large stroke volume (wide pulse pressure), while the AS creates the obstruction that splits the systolic peak. **Clinical Pearls for NEET-PG:** * **Best site to palpate:** Pulsus bisferiens is best appreciated in the **Brachial or Femoral arteries** (peripheral arteries) rather than the Carotid, as the two peaks become more distinct further from the heart. * **Differentiate from Pulsus Alternans:** Alternans is a beat-to-beat variation in amplitude (sign of LV failure), whereas Bisferiens has two peaks within a *single* pulse. * **Differentiate from Dicrotic Pulse:** In a dicrotic pulse, the second peak occurs in **diastole** (after the second heart sound), whereas in bisferiens, both peaks are in **systole** [1].

Q: All of the following are signs of cor pulmonale except?

Feeble pulse. **Explanation:** **Cor pulmonale** is defined as hypertrophy and/or dilation of the right ventricle (RV) resulting from pulmonary hypertension caused by diseases of the lung parenchyma or pulmonary vasculature (e.g., COPD, Interstitial Lung Disease). **Why "Feeble Pulse" is the Correct Answer:** A "feeble" or weak pulse typically indicates low cardiac output or systemic hypotension, often seen in left-sided heart failure or shock. In cor pulmonale, the primary pathology is **Right Heart Failure (RHF)**. While severe RHF can eventually lead to decreased left-sided filling and low output, a feeble pulse is not a classic or diagnostic sign of cor pulmonale. Instead, the pulse is usually normal in volume unless the patient is in extremis. **Analysis of Incorrect Options (Signs of Cor Pulmonale):** * **Elevated JVP:** This is the most sensitive sign of right-sided heart pressure overload [1]. The JVP is elevated with a prominent 'a' wave (due to forceful atrial contraction against a stiff RV) [1] or a 'v' wave (if tricuspid regurgitation develops). * **Hepatomegaly:** Increased systemic venous pressure leads to passive congestion of the liver. This may be associated with "pulsatile liver" if tricuspid regurgitation is present [1]. * **Peripheral Edema:** Increased hydrostatic pressure in the systemic circulation causes fluid to leak into the interstitium, manifesting as bilateral pitting pedal edema [1]. **Clinical Pearls for NEET-PG:** * **Gold Standard Diagnosis:** Right heart catheterization (to measure pulmonary artery pressures). * **Most Common Cause:** COPD is the leading cause of chronic cor pulmonale. * **ECG Findings:** Right axis deviation, "P-pulmonale" (tall, peaked P waves in lead II), and R/S ratio >1 in V1 [1]. * **Auscultation:** Loud P2 (pulmonary component of the second heart sound) [1] and a pansystolic murmur of tricuspid regurgitation at the left lower sternal border [1].

Q: Which of the following can NOT be used to treat peripheral arterial disease?

Sildenafil. **Explanation:** Peripheral Arterial Disease (PAD) is characterized by atherosclerotic narrowing of the peripheral arteries, leading to claudication and limb ischemia [1]. The management focuses on risk factor modification, exercise, and improving blood flow. **Why Sildenafil is the Correct Answer:** Sildenafil is a **Phosphodiesterase-5 (PDE-5) inhibitor** primarily used for erectile dysfunction and pulmonary arterial hypertension. While it causes vasodilation, it has **no proven clinical efficacy** in improving walking distance or reducing symptoms in patients with PAD. Therefore, it is not a standard of care for this condition. **Analysis of Other Options:** * **Cilostazol:** A **Phosphodiesterase-3 (PDE-3) inhibitor** with antiplatelet and vasodilatory properties. It is the **first-line pharmacological treatment** for symptomatic claudication as it significantly increases pain-free walking distance. * **Pentoxifylline:** A xanthine derivative that acts as a **rheologic modifier**. It reduces blood viscosity and improves erythrocyte flexibility, allowing better flow through stenosed vessels. It is a second-line agent compared to Cilostazol. * **Percutaneous Angioplasty:** This is a standard **revascularization procedure** used for patients with lifestyle-limiting claudication or critical limb ischemia who do not respond to medical therapy [1]. **High-Yield Clinical Pearls for NEET-PG:** * **Gold Standard Investigation for PAD:** Digital Subtraction Angiography (DSA). * **Best Initial Test:** Ankle-Brachial Index (ABI). An ABI **< 0.9** is diagnostic of PAD [1]. * **Cilostazol Contraindication:** It is strictly contraindicated in patients with **Heart Failure** of any severity (due to increased mortality associated with PDE-3 inhibitors). * **Smoking Cessation:** This is the most important modifiable risk factor to prevent disease progression.

Q: Hemorrhagic pericarditis is seen in which of the following conditions?

All of the above. Hemorrhagic pericarditis refers to the presence of blood within the pericardial space, often leading to a "bread and butter" appearance or frank bloody effusion [2]. It is characterized by inflammation of the pericardium accompanied by the leakage of red blood cells. **1. Why "All of the Above" is Correct:** * **Tuberculosis (TB):** This is the most common cause of chronic hemorrhagic pericarditis in developing countries [1]. It causes granulomatous inflammation that erodes small vessels, leading to a bloody or serosanguinous effusion [2]. * **Neoplasm:** Malignancy (most commonly lung cancer, breast cancer, or lymphoma) involves direct invasion or metastatic seeding of the pericardium. These friable tumor vessels bleed easily into the pericardial sac. * **Uremia:** While uremic pericarditis is typically "fibrinous," it is frequently associated with a hemorrhagic component due to platelet dysfunction (uremic coagulopathy) and the highly vascular nature of the inflammatory adhesions. **2. Clinical Pearls for NEET-PG:** * **Most common cause overall:** Viral pericarditis (usually leads to serous or fibrinous effusion, not typically hemorrhagic) [3]. * **Most common cause of hemorrhagic effusion:** Malignancy and Tuberculosis. * **Post-MI (Dressler’s Syndrome):** Can also present with hemorrhagic pericarditis. * **Triad of Cardiac Tamponade (Beck’s Triad):** Hypotension, JVD, and muffled heart sounds. This is a critical complication of rapidly accumulating hemorrhagic effusions [1]. * **Diagnostic Clue:** If a pericardial tap reveals blood that **does not clot**, it confirms it is a true hemorrhagic effusion (rather than an accidental traumatic tap), as the blood has already undergone fibrinolysis within the pericardium.

Q: Reciprocal ST depression in leads V1-V3 is typically seen in which type of myocardial infarction?

Posterior wall MI. The correct answer is **Posterior wall MI**. This is a classic "mirror image" phenomenon in electrocardiography [1]. Because the standard 12-lead ECG does not have electrodes placed directly on the back, we must look for reciprocal changes in the anterior leads (V1-V3), which are positioned directly opposite the posterior wall [2], [3]. **Why Posterior MI is correct:** In a posterior MI, the injury current travels toward the back (away from V1-V3). This results in **ST depression** (the reciprocal of ST elevation) and **tall R waves** (the reciprocal of deep Q waves) in leads V1, V2, and V3. Think of V1-V3 as looking at the heart from the front; if the back is "elevated," the front appears "depressed." **Analysis of Incorrect Options:** * **Inferior wall MI:** Characterized by ST elevation in leads II, III, and aVF. Reciprocal changes are typically seen in lead aVL [1]. * **Anterior wall MI:** Characterized by ST elevation in leads V1-V4 [1], [2]. * **Lateral wall MI:** Characterized by ST elevation in leads I, aVL, V5, and V6. **NEET-PG High-Yield Pearls:** 1. **Confirmatory Test:** If you suspect a posterior MI based on ST depression in V1-V3, the next step is to perform a **Posterior ECG** using leads **V7, V8, and V9**. ST elevation ≥ 0.5 mm in these leads confirms the diagnosis. 2. **The "Flip Test":** If you flip the ECG paper upside down and look at V1-V3 in a mirror, the ST depression and tall R waves will look like a classic STEMI pattern. 3. **Artery Involved:** Most commonly caused by occlusion of the **Right Coronary Artery (RCA)** or the Left Circumflex Artery (LCx). 4. **Association:** Posterior MI often occurs concurrently with Inferior wall MI. Always check II, III, and aVF.

Q: Cyanosis not improving with 100% oxygen suggests which of the following conditions?

Tetralogy of Fallot. The clinical scenario describes a failure of cyanosis to improve with 100% oxygen, a phenomenon known as a **negative Hyperoxic Test**. [2] This occurs when there is a **Right-to-Left (R-L) shunt**, where deoxygenated blood bypasses the lungs entirely and enters the systemic circulation directly. **1. Why Tetralogy of Fallot (TOF) is correct:** TOF is a cyanotic congenital heart disease characterized by a large ventricular septal defect (VSD) and right ventricular outflow tract obstruction (pulmonary stenosis). [1] Because the blood is shunted from the right ventricle to the aorta without passing through the pulmonary capillaries, increasing the fraction of inspired oxygen ($FiO_2$) cannot oxygenate this "shunted" blood. [2] Therefore, the arterial $PaO_2$ remains low despite 100% oxygen therapy. **2. Why the other options are incorrect:** * **Interstitial Lung Disease (ILD) & Bronchial/Cardiac Asthma:** These are primarily pulmonary causes of hypoxia (V/Q mismatch or diffusion defects). In these conditions, the blood still comes into contact with the alveoli. Providing 100% oxygen increases the alveolar-arterial gradient, forcing more oxygen into the blood and significantly improving $PaO_2$ and cyanosis. **Clinical Pearls for NEET-PG:** * **Hyperoxic Test:** Used to differentiate between cardiac (R-L shunt) and pulmonary causes of cyanosis. If $PaO_2$ remains $<100$ mmHg after 100% $O_2$, a cardiac shunt is highly likely. * **TOF Components:** VSD, Overriding of Aorta, Pulmonary Stenosis, and RV Hypertrophy. [1] * **X-ray finding in TOF:** "Boot-shaped heart" (Coeur en sabot). * **Management of "Tet Spells":** Knee-chest position (increases systemic vascular resistance to reduce R-L shunt), oxygen, and morphine.

Q: Which one of the following drugs should be avoided in Wolff-Parkinson-White (WPW) Syndrome?

Digoxin. **Explanation:** In **Wolff-Parkinson-White (WPW) Syndrome**, patients possess an accessory pathway (Bundle of Kent) that bypasses the AV node [2]. The primary danger in WPW occurs during atrial tachyarrhythmias (like Atrial Fibrillation), where impulses can conduct rapidly down the accessory pathway, leading to Ventricular Fibrillation and sudden cardiac death. **Why Digoxin is avoided:** Digoxin (along with Calcium Channel Blockers like Verapamil and Beta-blockers) acts by **blocking or slowing conduction through the AV node** [1]. When the AV node is inhibited, the "braking" mechanism of the heart is lost, forcing more impulses to travel exclusively through the accessory pathway. Digoxin also shortens refractory periods and enhances excitability in accessory pathways, which paradoxically increases the ventricular rate, potentially triggering fatal arrhythmias [1]. **Analysis of other options:** * **Adenosine:** While generally avoided in WPW with AFib for similar reasons as Digoxin (AV nodal blockade), it is used in stable, narrow-complex orthodromic SVT [1]. However, Digoxin is the classic "absolute contraindication" taught for board exams. * **Procainamide:** This is the **drug of choice** for stable WPW with tachycardia. It works by increasing the refractory period of the accessory pathway itself, slowing down the rapid conduction. * **Amiodarone:** Can be used as it affects both the AV node and the accessory pathway, though Procainamide is preferred. **High-Yield Clinical Pearls for NEET-PG:** * **The "ABCD" of drugs to avoid in WPW with AFib:** **A**denosine, **B**eta-blockers, **C**alcium channel blockers (Verapamil/Diltiazem), and **D**igoxin. * **Definitive Treatment:** Radiofrequency Ablation of the accessory pathway. * **ECG Triad of WPW:** Short PR interval (<0.12s), Delta wave (slurred upstroke of QRS), and Wide QRS complex [2].

Question 1

An early systolic murmur may be caused by all of the following except?

Accepted Answer

Aortic stenosis

Answer

Small ventricular septal defect

Answer

Papillary muscle dysfunction

Answer

Tricuspid regurgitation

Question 2

Pulsus bisferiens occurs in which of the following conditions?

Accepted Answer

All of the above

Answer

Hypertrophic Obstructive Cardiomyopathy (HOCM)

Answer

Aortic Regurgitation (AR)

Answer

Aortic Stenosis and Aortic Regurgitation (AS and AR)

Question 3

Pulmonary apoplexy is seen in which of the following conditions?

Accepted Answer

Mitral stenosis

Answer

Mitral regurgitation

Answer

Aortic stenosis

Answer

Aortic regurgitation

Question 4

All of the following are signs of cor pulmonale except?

Accepted Answer

Feeble pulse

Answer

Elevated JVP

Answer

Hepatomegaly

Answer

Peripheral edema

Question 5

Which of the following can NOT be used to treat peripheral arterial disease?

Accepted Answer

Sildenafil

Answer

Pentoxifylline

Answer

Cilostazol

Answer

Percutaneous angioplasty

Question 6

Hemorrhagic pericarditis is seen in which of the following conditions?

Accepted Answer

All of the above

Answer

Uremia

Answer

Tuberculosis

Answer

Neoplasm

Question 7

Prophylactic antibiotic coverage before dental extraction is indicated for all the following conditions except:

Accepted Answer

Coronary artery bypass graft surgery

Answer

Kidney damage on hemodialysis

Answer

Prosthetic aortic valve

Answer

Rheumatic heart disease

Question 8

Reciprocal ST depression in leads V1-V3 is typically seen in which type of myocardial infarction?

Accepted Answer

Posterior wall MI

Answer

Inferior wall MI

Answer

Anterior wall MI

Answer

Lateral wall MI

Question 9

Cyanosis not improving with 100% oxygen suggests which of the following conditions?

Accepted Answer

Tetralogy of Fallot

Answer

Cardiac asthma

Answer

Interstitial lung disease

Answer

Bronchial asthma

Question 10

Which one of the following drugs should be avoided in Wolff-Parkinson-White (WPW) Syndrome?

Accepted Answer

Digoxin

Answer

Adenosine

Answer

Procainamide

Answer

Amiodarone

Cardiology — MCQs

Cardiology — MCQs

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