Cardiology Practice Questions

Q: Which congenital heart disease is associated with pre-excitation?

Ebstein's Anomaly. **Explanation:** **Ebstein’s Anomaly** is the correct answer because it has a unique anatomical and physiological association with **Wolff-Parkinson-White (WPW) Syndrome**. In Ebstein’s anomaly, there is a failure of delamination of the tricuspid valve leaflets, leading to their downward displacement into the right ventricle ("atrialization" of the RV). This structural abnormality is frequently accompanied by **accessory atrioventricular pathways** (bundles of Kent), particularly on the right side of the heart. Approximately 10–25% of patients with Ebstein’s anomaly exhibit pre-excitation on ECG (short PR interval and Delta waves), making them prone to supraventricular tachycardias. **Analysis of Incorrect Options:** * **Atrial Septal Defect (ASD):** While ASD is the most common CHD associated with Ebstein’s anomaly, an isolated ASD typically presents with a Right Bundle Branch Block (RBBB) pattern, not pre-excitation. * **Bicuspid Aortic Valve:** This is the most common congenital heart anomaly overall. It is associated with aortic stenosis, regurgitation, and Turner syndrome, but not with accessory conduction pathways. * **Patent Ductus Arteriosus (PDA):** This is an extracardiac shunt between the aorta and pulmonary artery. It causes a continuous machinery murmur but does not involve the cardiac conduction system. **High-Yield Clinical Pearls for NEET-PG:** * **ECG Findings in Ebstein’s:** Giant "Himalayan" P-waves (right atrial enlargement), RBBB, and pre-excitation (WPW). * **Auscultation:** Characterized by a "split" S1 (loud tricuspid closure or "sail sound") and a quadruple gallop rhythm. * **Maternal Link:** Classically associated with maternal **Lithium** intake during the first trimester. * **X-ray:** Shows a massive, "box-shaped" heart due to severe right atrial enlargement.

Q: A 70-year-old man presents with isolated systolic hypertension. His blood pressure is 170/80 mm Hg, and physical examination reveals normal heart and lungs. He has no other medical conditions. For a patient with high blood pressure, select the most appropriate medication.

Thiazides. **Explanation:** **1. Why Thiazides are correct:** The patient presents with **Isolated Systolic Hypertension (ISH)**, defined as a systolic BP ≥140 mmHg with a diastolic BP <90 mmHg. This condition is common in the elderly due to age-related arterial stiffness and decreased compliance of the aorta [1]. Large-scale clinical trials (such as SHEP and ALLHAT) have established **Thiazide-type diuretics** (e.g., Chlorthalidone, Hydrochlorothiazide) and **Calcium Channel Blockers (CCBs)** as the first-line agents for ISH. They are highly effective in reducing stroke risk and cardiovascular events in this specific demographic [1]. **2. Why the other options are incorrect:** * **Spironolactone (B):** This is a potassium-sparing diuretic/mineralocorticoid receptor antagonist. It is typically used as an add-on therapy (4th line) in resistant hypertension or in patients with heart failure (HFrEF). * **Clonidine (C):** A centrally acting alpha-2 agonist. It is not a first-line agent due to its side effect profile (sedation, dry mouth) and the risk of severe rebound hypertension if doses are missed. * **Prazosin (D):** An alpha-1 blocker. It is associated with "first-dose hypotension" and is not a primary choice for ISH [2]. It is generally reserved for hypertensive patients with concomitant Benign Prostatic Hyperplasia (BPH). **3. NEET-PG High-Yield Pearls:** * **Definition of ISH:** Widened pulse pressure (Systolic ↑, Diastolic normal/low) [1]. * **Drug of Choice (DOC):** Thiazides or Long-acting Dihydropyridine CCBs (e.g., Amlodipine) [1]. * **Thiazide Side Effects:** Remember the "Hypo-Hyper" rule: **Hypo**kalemia, **Hypo**natremia, **Hyper**uricemia, **Hyper**calcemia, and **Hyper**glycemia. * **JNC-8 Guidelines:** For the general elderly population (≥60 years), the BP goal is <150/90 mmHg, though more recent guidelines (ACC/AHA) suggest stricter targets (<130/80 mmHg) if tolerated.

Q: RBBB with left axis deviation is characteristic of which condition?

Ostium Primum ASD. **Explanation** The characteristic ECG finding of **Right Bundle Branch Block (RBBB) with Left Axis Deviation (LAD)** is a classic hallmark of **Ostium Primum Atrial Septal Defect (ASD)**. **Why Ostium Primum ASD is correct:** In Ostium Primum ASD (part of the endocardial cushion defect spectrum), the conduction system is anatomically displaced. The AV node and the Bundle of His are displaced posteriorly and inferiorly. This leads to early activation of the anterior left ventricle and delayed activation of the posterior-superior regions, resulting in **Left Axis Deviation** (usually -30° to -90°). The **RBBB** pattern (rsR' in V1) is caused by right ventricular volume overload due to the left-to-right shunt, leading to delayed depolarization of the right ventricle. **Why other options are incorrect:** * **Mitral Valve Prolapse (MVP):** Usually presents with a normal axis or non-specific ST-T wave changes. It is not associated with RBBB or LAD. * **Patent Ductus Arteriosus (PDA):** Typically shows **Left Ventricular Hypertrophy (LVH)** and a normal or leftward axis, but not RBBB. * **Ventricular Septal Defect (VSD):** Small VSDs have normal ECGs; large VSDs typically show **Biventricular Hypertrophy (Katz-Wachtel phenomenon)**. **High-Yield Clinical Pearls for NEET-PG:** * **Ostium Secundum ASD (Most common):** Shows RBBB with **Right Axis Deviation (RAD)**. * **Ostium Primum ASD:** Shows RBBB with **Left Axis Deviation (LAD)**. * **Tricuspid Atresia:** Also presents with LAD, but with **Left Ventricular Hypertrophy** and decreased pulmonary vascular markings (cyanotic heart disease). * **Katz-Wachtel Phenomenon:** Large mid-precordial biphasic QRS complexes seen in VSD.

Q: A 42-year-old smoker has developed an acute anterior wall myocardial infarction. Which of the following coronary arteries is most likely to show obstruction?

Left anterior descending artery. ### Explanation **Correct Option: A. Left Anterior Descending Artery (LAD)** The **Left Anterior Descending (LAD)** artery is the primary blood supply to the anterior wall of the left ventricle and the anterior two-thirds of the interventricular septum. In clinical practice, the LAD is the most commonly occluded vessel in myocardial infarction (MI). Obstruction of this artery leads to an **Anterior Wall MI**, typically characterized by ST-segment elevation in leads **V1 to V4** on an ECG [1]. **Incorrect Options:** * **B. Left Posterior Descending Artery (PDA):** This artery supplies the posterior and inferior walls of the heart [2]. Occlusion results in an Inferior or Posterior MI. * **C. Right Coronary Artery (RCA):** In 85% of individuals (right-dominant circulation), the RCA gives rise to the PDA. Obstruction usually leads to an **Inferior Wall MI** (leads II, III, aVF) and may involve the Right Ventricle. * **D. Circumflex Artery (LCx):** The LCx supplies the lateral wall of the left ventricle. Obstruction leads to a **Lateral Wall MI**, seen in leads I, aVL, V5, and V6 [3]. **High-Yield Clinical Pearls for NEET-PG:** * **"The Widow Maker":** The LAD is often referred to by this name due to the high mortality associated with its occlusion. * **ECG Correlation:** * Anterior Wall: V1–V4 (LAD) [1] * Septal: V1–V2 (LAD) * Lateral Wall: I, aVL, V5, V6 (LCx) * Inferior Wall: II, III, aVF (RCA > LCx) * **Most Common Site of MI:** LAD (40–50%) > RCA (30–40%) > LCx (15–20%). * **Papillary Muscle Rupture:** While the anterolateral papillary muscle has dual supply (LAD/LCx), the **posteromedial** papillary muscle is supplied solely by the PDA (usually RCA), making it more susceptible to rupture post-MI.

Q: Water hammer pulse is seen in which of the following conditions?

Aortic regurgitation. **Explanation:** **Water hammer pulse** (also known as Corrigan’s pulse or collapsing pulse) is a clinical sign characterized by a rapid, forceful upstroke followed by a sudden, rapid collapse [1]. **Why Aortic Regurgitation (AR) is correct:** In AR, the stroke volume is increased because the left ventricle must pump both the normal blood volume and the blood that leaked back from the aorta during diastole. This leads to a high systolic pressure [1]. During diastole, blood rapidly flows backward into the left ventricle and forward into the peripheral circulation, causing a precipitous drop in diastolic pressure. This **widened pulse pressure** creates the characteristic "bounding" and "collapsing" sensation. **Analysis of Incorrect Options:** * **Aortic Stenosis (AS):** Characterized by a **Pulsus Parvus et Tardus** (small volume, slow-rising pulse) due to the obstructed outflow from the left ventricle. * **Aortic Stenosis and Aortic Regurgitation:** While both may coexist, the presence of AS typically "dampens" the water hammer effect of AR, leading to a "bisferiens pulse" (double-peaked pulse). * **Mitral Regurgitation:** Usually presents with a normal or slightly reduced pulse volume; it does not cause the massive diastolic pressure drop seen in AR. **High-Yield Clinical Pearls for NEET-PG:** * **Maneuver:** To best elicit a water hammer pulse, palpate the radial artery with the palm of your hand while **elevating the patient's arm** above the level of the heart. * **Associated Signs of AR:** * **De Musset’s sign:** Head nodding with each heartbeat [1]. * **Quincke’s sign:** Capillary pulsations in the nail bed. * **Traube’s sign:** "Pistol shot" sounds heard over the femoral artery. * **Duroziez’s sign:** Systolic and diastolic murmurs heard over the femoral artery when compressed.

Q: Which of the following increases susceptibility to coronary artery disease?

Nephrotic syndrome. ### Explanation **Correct Option: C. Nephrotic Syndrome** Nephrotic syndrome is a potent risk factor for premature coronary artery disease (CAD). The underlying mechanism is **severe dyslipidemia** caused by the liver's compensatory increase in lipoprotein synthesis (including VLDL and LDL) in response to low oncotic pressure from hypoalbuminemia. Additionally, there is a loss of antithrombin III and proteins C and S in the urine, creating a **hypercoagulable state**. This combination of high LDL levels and pro-thrombotic tendency significantly accelerates atherosclerosis. **Analysis of Incorrect Options:** * **A. Type V Hyperlipoproteinemia:** This involves elevated VLDL and chylomicrons. While it significantly increases the risk of **acute pancreatitis**, it is not as strongly associated with CAD as Type IIa, IIb, or III hyperlipoproteinemias. * **B. Von Willebrand's Disease:** This is a bleeding disorder characterized by a deficiency or dysfunction of vWF. Because vWF is essential for platelet adhesion, its deficiency may actually have a paradoxical **protective effect** against arterial thrombosis and atherosclerosis. * **D. Systemic Lupus Erythematosus (SLE):** While SLE is associated with accelerated atherosclerosis (often due to chronic inflammation and steroid use), **Nephrotic Syndrome** (which can be a manifestation of SLE as Lupus Nephritis) is considered a more direct metabolic driver of CAD in the context of standard medical examinations. **High-Yield Pearls for NEET-PG:** * **Friedrickson Classification:** Type IIa (High LDL) and Type IIb (High LDL + VLDL) are the most strongly associated with CAD [1]. * **Nephrotic Syndrome Triad for CAD:** Hyperlipidemia + Hypercoagulability + Hypertension [2]. * **Protective Factors:** High levels of HDL (High-Density Lipoprotein) and regular physical activity are the primary factors that decrease CAD susceptibility [1].

Q: Which of the following is not a first-line antihypertensive medication?

Atenolol. The correct answer is **Atenolol**. According to current clinical guidelines (JNC 8 and AHA/ACC), **Beta-blockers** are no longer considered first-line agents for the management of primary hypertension in the absence of specific compelling indications (like post-MI or heart failure) [1, 2]. **Why Atenolol is the correct answer:** Clinical trials (such as the ASCOT-BPLA) demonstrated that Beta-blockers, particularly Atenolol, are less effective than other classes in preventing stroke and cardiovascular mortality [2]. They are also associated with an increased risk of new-onset diabetes and are less effective at reducing central aortic pressure compared to peripheral blood pressure. **Why the other options are incorrect:** * **Enalapril (ACE Inhibitor):** ACE inhibitors are first-line agents, especially beneficial in patients with diabetes or chronic kidney disease due to their renoprotective effects. * **Hydrochlorothiazide (Thiazide Diuretic):** Thiazides have long been a cornerstone of first-line therapy, proven to reduce cardiovascular morbidity and mortality effectively [3]. * **Amlodipine (Calcium Channel Blocker):** Dihydropyridine CCBs are highly effective first-line agents, particularly recommended for elderly patients and those of African descent. **High-Yield Clinical Pearls for NEET-PG:** * **First-line ABCD:** **A**CEIs/ARBs, **B**-blockers (only if compelling indications), **C**CBs, and **D**iuretics. * **Compelling Indications for Beta-blockers:** Stable angina, post-Myocardial Infarction, and Heart Failure with reduced Ejection Fraction (HFrEF) [2]. * **Side Effect Note:** Avoid Thiazides in patients with gout (hyperuricemia) and ACEIs in pregnancy (teratogenic).

Q: A 70-year-old male with a history of hypertension and diabetes mellitus developed the following rhythm with a blood pressure of 90/40 mm Hg and a feeble pulse. What is the next step in management?

DC cardioversion. ***DC cardioversion*** - **Hemodynamic instability** (BP 90/40 mm Hg, feeble pulse) mandates immediate **electrical cardioversion** per ACLS guidelines, regardless of rhythm type. - **Synchronized DC cardioversion** is the first-line treatment for any unstable tachyarrhythmia to restore normal rhythm and hemodynamics rapidly. *IV adenosine* - **Adenosine** is used for stable **supraventricular tachycardia** (SVT) but contraindicated in hemodynamically unstable patients. - The patient's **hypotension** and **feeble pulse** indicate the need for immediate electrical intervention, not pharmacological agents. *IV diltiazem* - **Diltiazem** is a calcium channel blocker that can worsen **hypotension** and is inappropriate in unstable patients. - Used for **rate control** in stable atrial fibrillation/flutter, but contraindicated when hemodynamic compromise is present. *Ibutilide* - **Ibutilide** is an antiarrhythmic used for **chemical cardioversion** of stable atrial fibrillation/flutter. - Takes time to work and is inappropriate for **hemodynamically unstable** patients who require immediate electrical cardioversion.

Q: Which of the following is NOT a feature of ventricular tachycardia?

Good response to carotid sinus massage. **Explanation:** Ventricular Tachycardia (VT) is a life-threatening arrhythmia originating from the ventricles, often occurring in the setting of structural heart disease. **Why Option C is correct:** Carotid sinus massage (CSM) increases vagal tone, which primarily affects the SA and AV nodes. While CSM can slow or terminate Supraventricular Tachycardias (SVT) involving the AV node (like AVNRT), it has **no effect on Ventricular Tachycardia**. A lack of response to vagal maneuvers is a hallmark feature that helps differentiate VT from SVT with aberrancy. **Analysis of Incorrect Options:** * **A. AV Dissociation:** This is a pathognomonic feature of VT. It occurs when the atria and ventricles beat independently (P waves are "buried" or dissociated from QRS complexes). * **B. Capture or Fusion Beats:** These are highly specific for VT. A **fusion beat** occurs when a supraventricular impulse and a ventricular impulse "collide" to form a hybrid QRS. A **capture beat** occurs when a supraventricular impulse "captures" the ventricle briefly, producing a normal-looking QRS amidst the wide-complex tachycardia. * **D. History of Myocardial Infarction:** This is the strongest clinical predictor of VT. In a patient with a prior MI presenting with wide-complex tachycardia, there is a >90% probability that the rhythm is VT. **NEET-PG High-Yield Pearls:** * **Brugada’s Criteria:** Used to differentiate VT from SVT with aberrancy (e.g., absence of RS complex in precordial leads). * **Northwest Axis:** A QRS axis between -90° and 180° ("extreme axis deviation") strongly suggests VT. * **Treatment:** Hemodynamically unstable VT requires immediate **synchronized DC cardioversion**. Stable VT is typically treated with **Amiodarone** (drug of choice) or Lidocaine.

Question 1

Which congenital heart disease is associated with pre-excitation?

Accepted Answer

Ebstein's Anomaly

Answer

Atrial Septal Defect

Answer

Bicuspid Aortic Valve

Answer

Patent Ductus Arteriosus

Question 2

A 70-year-old man presents with isolated systolic hypertension. His blood pressure is 170/80 mm Hg, and physical examination reveals normal heart and lungs. He has no other medical conditions. For a patient with high blood pressure, select the most appropriate medication.

Accepted Answer

Thiazides

Answer

Spironolactone

Answer

Clonidine

Answer

Prazosin

Question 3

A 40-year-old woman presents with a 3-year history of increasing dyspnea and fatigue. Physical examination reveals increased jugular venous pressure with prominent c-v waves, a reduced carotid pulse, a left parasternal lift, loud P2, and right-sided S3 and S4 gallops. Lung fields are clear on chest X-ray, and ECG shows evidence of right ventricular hypertrophy. Pulmonary function tests show a slight restrictive pattern. Primary pulmonary hypertension is suspected. Which of the following is the most appropriate diagnostic test to confirm the diagnosis?

Accepted Answer

Cardiac catheterization

Answer

Open lung biopsy

Answer

Pulmonary angiography

Answer

Noninvasive exercise testing

Question 4

RBBB with left axis deviation is characteristic of which condition?

Accepted Answer

Ostium Primum ASD

Answer

Mitral valve prolapse

Answer

Patent Ductus Arteriosus

Answer

Ventricular Septal Defect

Question 5

A 42-year-old smoker has developed an acute anterior wall myocardial infarction. Which of the following coronary arteries is most likely to show obstruction?

Accepted Answer

Left anterior descending artery

Answer

Left posterior descending artery

Answer

Right coronary artery

Answer

Circumflex artery

Question 6

Water hammer pulse is seen in which of the following conditions?

Accepted Answer

Aortic regurgitation

Answer

Aortic stenosis

Answer

Aortic stenosis and aortic regurgitation

Answer

Mitral regurgitation

Question 7

Which of the following increases susceptibility to coronary artery disease?

Accepted Answer

Nephrotic syndrome

Answer

Type V hyperlipoproteinemia

Answer

Von Willebrand's disease

Answer

Systemic lupus erythematosus

Question 8

Which of the following is not a first-line antihypertensive medication?

Accepted Answer

Atenolol

Answer

Enalapril

Answer

Hydrochlorothiazide

Answer

Amlodipine

Question 9

A 70-year-old male with a history of hypertension and diabetes mellitus developed the following rhythm with a blood pressure of 90/40 mm Hg and a feeble pulse. What is the next step in management?

Accepted Answer

DC cardioversion

Answer

IV adenosine

Answer

IV diltiazem

Answer

Ibutilide

Question 10

Which of the following is NOT a feature of ventricular tachycardia?

Accepted Answer

Good response to carotid sinus massage

Answer

AV dissociation

Answer

Capture or fusion beats

Answer

A history of myocardial infarction

Cardiology — MCQs

Cardiology — MCQs

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