Cardiology Practice Questions

Q: A 50-year-old man presents to the emergency room with several hours of progressively increasing chest pain that no longer responds to sublingual nitroglycerin. This type of angina is thought to be due to which of the following conditions?

Thrombosis with or without underlying atherosclerosis. The clinical presentation describes **Unstable Angina (UA)**, characterized by chest pain that is increasing in frequency/severity (crescendo angina) and is no longer relieved by rest or nitroglycerin [2]. **1. Why Option D is Correct:** The primary pathophysiology of Unstable Angina and Non-ST Elevation Myocardial Infarction (NSTEMI) is the **rupture or erosion of an unstable atherosclerotic plaque**. This leads to platelet aggregation and the formation of a **non-occlusive (subtotal) thrombus** [1]. Unlike stable angina, where the lumen is simply narrowed by a fixed plaque, the acute change in UA is driven by this dynamic thrombotic process, which significantly reduces coronary blood flow. **2. Why Other Options are Incorrect:** * **Option A (Atherosclerosis alone):** This is the hallmark of **Stable Angina**. It involves a fixed, calcified plaque that causes pain only during increased myocardial oxygen demand (exertion) and is typically relieved by rest or nitroglycerin [3]. * **Option B (Coronary artery embolism):** While a cause of MI, it is rare. It is usually associated with infective endocarditis, prosthetic valves, or atrial fibrillation. * **Option C (Coronary artery spasm):** This refers to **Prinzmetal (Variant) Angina**. While it causes pain at rest, it typically shows transient ST-segment elevation on ECG and responds promptly to nitroglycerin or calcium channel blockers. **Clinical Pearls for NEET-PG:** * **Acute Coronary Syndrome (ACS)** includes Unstable Angina, NSTEMI, and STEMI [2]. * **UA vs. NSTEMI:** Both present similarly, but NSTEMI has elevated cardiac biomarkers (Troponins), indicating myocardial necrosis, whereas UA does not [2]. * **Braunwald Classification** is used to grade the severity of Unstable Angina. * **Management:** Immediate treatment involves "MONA" (Morphine, Oxygen, Nitrates, Aspirin) and antiplatelet/anticoagulant therapy.

Q: Which of the following is the treatment of choice for Atrial fibrillation in patients with WPW syndrome who are hemodynamically unstable?

DC Cardioversion. ### Explanation **1. Why DC Cardioversion is the Correct Answer:** In any patient with a tachyarrhythmia (including AF with WPW) who is **hemodynamically unstable** (hypotension, altered mental status, chest pain, or acute heart failure), the immediate treatment of choice is **Synchronized DC Cardioversion**. In WPW syndrome, AF is particularly dangerous because the accessory pathway (Bundle of Kent) has a short refractory period, allowing rapid conduction to the ventricles. This can lead to extremely high ventricular rates, potentially degenerating into Ventricular Fibrillation (VF) and cardiac arrest. **2. Analysis of Incorrect Options:** * **Procainamide (Option A):** This is the drug of choice for **hemodynamically stable** patients with pre-excited AF. It slows conduction through the accessory pathway. * **Digoxin (Option B):** This is **strictly contraindicated** [2]. AV nodal blocking agents (ABCD: Atenolol/Beta-blockers, Blockers of Calcium/Verapamil, Clonidine, Digoxin) paradoxically enhance conduction through the accessory pathway, increasing the risk of VF [2]. * **Radio-frequency Ablation (Option D):** This is the **definitive/long-term treatment** for WPW syndrome to prevent recurrences [1], but it is not the initial management in an acute, unstable emergency. **3. Clinical Pearls for NEET-PG:** * **The "FBI" Rule:** AF in WPW presents as a rhythm that is **F**ast, **B**road (QRS), and **I**rregular. * **Contraindicated Drugs:** Avoid "ABCD" (Adenosine, Beta-blockers, Calcium channel blockers, Digoxin) in pre-excited AF. * **Definitive Treatment:** RFA of the accessory tract is the gold standard for long-term cure [1]. * **Emergency Rule:** Stability dictates management. Unstable = Shock; Stable = Medicate (Procainamide/Ibutilide).

Q: A patient with short PR interval and Delta waves on ECG presents with Atrial Fibrillation and rapid ventricular rate. He is hemodynamically stable. All of the following agents may be used in the management, except?

Verapamil. **Explanation:** The patient presents with **Wolff-Parkinson-White (WPW) syndrome** (indicated by short PR interval and delta waves) complicated by **Atrial Fibrillation (AF)**. In WPW, an accessory pathway (Bundle of Kent) exists alongside the AV node [1]. **Why Verapamil is the Correct Answer (Contraindicated):** Verapamil is a non-dihydropyridine Calcium Channel Blocker (CCB) that selectively blocks the **AV node**. In WPW with AF, blocking the AV node forces all atrial impulses to travel exclusively through the accessory pathway. Unlike the AV node, the accessory pathway lacks "decremental conduction" (it does not slow down rapid impulses). This can lead to a 1:1 conduction of atrial impulses to the ventricles, resulting in **Ventricular Fibrillation (VF)** and sudden cardiac death. Other agents to avoid include Beta-blockers, Digoxin, and Adenosine (ABCD: Adenosine, Beta-blockers, CCBs, Digoxin). **Analysis of Other Options:** * **Procainamide (Option B):** The drug of choice for hemodynamically stable WPW with AF. It increases the refractory period of the accessory pathway, slowing the heart rate. * **Ibutilide (Option C):** A Class III antiarrhythmic that can be used for chemical cardioversion in stable patients as it slows conduction in the accessory pathway. * **Amiodarone (Option D):** Though its use is controversial in some guidelines due to its minor AV-blocking effects, it is generally considered an option in stable patients as it affects both the AV node and the accessory pathway. **High-Yield Clinical Pearls for NEET-PG:** 1. **Hemodynamically Unstable WPW + AF:** Immediate **DC Cardioversion** is the treatment of choice. 2. **Definitive Treatment:** Radiofrequency Ablation (RFA) of the accessory pathway. 3. **ECG Hallmark:** Delta wave (slurred upstroke of QRS) representing pre-excitation [1]. 4. **Avoid "ABCD"** in WPW with AF: **A**denosine, **B**eta-blockers, **C**alcium channel blockers, **D**igoxin.

Q: McConnell's sign in echocardiography is seen in which condition?

Pulmonary Embolism (PE). **Explanation:** **McConnell’s sign** is a highly specific echocardiographic finding for **Acute Pulmonary Embolism (PE)**. It is characterized by **akinesia (lack of movement) of the right ventricular (RV) free wall with sparing of the apex**, which remains hyperdynamic. 1. **Why it occurs in PE:** In acute PE, a sudden increase in pulmonary artery pressure causes acute RV pressure overload [1]. The RV free wall, being thin, fails to contract against this high resistance (akinesia). However, the RV apex is tethered to the hyperdynamic left ventricle, causing it to appear to contract normally or even vigorously. This "apical sparing" distinguishes PE from other causes of RV dysfunction. 2. **Analysis of Incorrect Options:** * **Myocardial Infarction (MI):** While an RV infarct causes RV wall motion abnormalities, it typically involves the entire wall (including the apex) and does not show the specific apical sparing seen in McConnell’s sign [2]. * **Sarcoidosis:** Cardiac sarcoidosis typically presents with restrictive cardiomyopathy, arrhythmias, or localized wall thinning/aneurysms, but not this specific RV pattern. * **HOCM:** This is characterized by asymmetrical septal hypertrophy and systolic anterior motion (SAM) of the mitral valve, affecting the left ventricle rather than the right. **High-Yield Clinical Pearls for NEET-PG:** * **Specificity:** McConnell’s sign has a high specificity (approx. 94%) but low sensitivity for PE. * **Other Echo findings in PE:** * **60/60 sign:** Pulmonary artery acceleration time <60ms + midsystolic notch. * **D-shaped Left Ventricle:** Due to the interventricular septum shifting toward the LV during diastole (RV pressure overload). * **TAPSE:** Tricuspid Annular Plane Systolic Excursion is often reduced (<16mm) in PE, indicating RV dysfunction.

Q: A 60-year-old marathon runner complains of episodes of dizziness. On auscultation, an ejection systolic murmur is heard. What is the most likely clinical diagnosis?

Left Ventricular Hypertrophy with Valvular Aortic Stenosis. The clinical presentation of a **60-year-old** patient with **dizziness (syncope/near-syncope)** and an **ejection systolic murmur (ESM)** is a classic description of **Aortic Stenosis (AS)**. [1] **1. Why Option B is Correct:** Valvular Aortic Stenosis creates an obstruction to the left ventricular outflow tract. This results in a harsh ESM heard best at the right second intercostal space, radiating to the carotids. [1] To overcome this pressure gradient, the left ventricle undergoes compensatory concentric **Left Ventricular Hypertrophy (LVH)**. Dizziness or syncope occurs because the fixed cardiac output cannot meet the systemic demand during exertion (or in this case, a marathon runner's activity). [2] **2. Why Incorrect Options are Wrong:** * **Option A:** Hypertension usually presents with an S4 or a loud A2, not a classic ESM. While AFib can coexist, it does not explain the murmur or the exertional dizziness as specifically as AS. * **Option C:** Pulmonic Stenosis also causes an ESM, but it is heard best at the left upper sternal border and is associated with RVH. It is much rarer in a 60-year-old and typically presents with right-sided heart failure symptoms rather than exertional syncope. * **Option D:** Brugada Syndrome is a channelopathy causing sudden cardiac death due to ventricular arrhythmias. It presents with specific ECG changes (coved ST elevation in V1-V3) but **no heart murmur**. **Clinical Pearls for NEET-PG:** * **Classic Triad of AS (SAD):** **S**yncope, **A**ngina, and **D**yspnea. * **Physical Signs:** *Pulsus parvus et tardus* (slow-rising, low-volume pulse) and a paradoxical split of S2. [1] * **Most Common Cause:** In patients >65, it is senile calcific AS; in younger patients, it is often a Bicuspid Aortic Valve. [2] * **Murmur Intensity:** The later the peak of the ESM, the more severe the stenosis.

Q: Rheumatic activity involves which valves?

Mitral & aortic. **Explanation:** Rheumatic Heart Disease (RHD) is a sequela of Rheumatic Fever caused by an autoimmune response to Group A Streptococcal pharyngitis [1]. The disease primarily affects the endocardium, leading to valvulitis. **Why Mitral & Aortic are correct:** The frequency of valvular involvement in RHD is directly proportional to the hemodynamic stress (pressure) experienced by the valve. The **Mitral valve** is the most commonly affected (found in nearly all cases), followed by the **Aortic valve** [1]. This is because the left-sided heart chambers operate under significantly higher pressures than the right-sided chambers, leading to greater mechanical trauma and subsequent inflammatory scarring. **Analysis of Incorrect Options:** * **A & B (Aortic, Tricuspid, and Pulmonary):** The Pulmonary valve is the least commonly affected valve in RHD. Isolated pulmonary involvement is extremely rare and usually only occurs in the context of severe multivalvular disease. * **C (Mitral & Tricuspid):** While the Tricuspid valve can be involved, it is almost never affected in isolation. It is typically involved only after the mitral and aortic valves have already sustained significant damage. **High-Yield Clinical Pearls for NEET-PG:** * **Order of Frequency:** Mitral > Aortic > Tricuspid > Pulmonary (M > A > T > P). * **Most Common Lesion:** Mitral Regurgitation (MR) is the most common finding in *acute* rheumatic carditis [1]; Mitral Stenosis (MS) is the classic hallmark of *chronic* RHD. * **Pathognomonic Feature:** **Aschoff bodies** (granulomatous inflammation) in the myocardium. * **McCallum’s Patch:** An area of endocardial thickening in the left atrium caused by regurgitant jets in MR.

Question 1

A 50-year-old man presents to the emergency room with several hours of progressively increasing chest pain that no longer responds to sublingual nitroglycerin. This type of angina is thought to be due to which of the following conditions?

Accepted Answer

Thrombosis with or without underlying atherosclerosis

Answer

Atherosclerosis alone

Answer

Coronary artery embolism

Answer

Coronary artery spasm

Question 2

Which of the following is the treatment of choice for Atrial fibrillation in patients with WPW syndrome who are hemodynamically unstable?

Accepted Answer

DC Cardioversion

Answer

Procainamide

Answer

Digoxin

Answer

Radio-frequency ablation of the bypass tract

Question 3

All of the following findings during an exercise tolerance test are associated with left coronary artery disease except?

Accepted Answer

Failure to increase systolic blood pressure by at least 20 mm Hg

Answer

Early onset of ST depression

Answer

Persistence of ST segment changes late into the recovery phase

Answer

ST segment elevation in aVR

Question 4

A patient with short PR interval and Delta waves on ECG presents with Atrial Fibrillation and rapid ventricular rate. He is hemodynamically stable. All of the following agents may be used in the management, except?

Accepted Answer

Verapamil

Answer

Procainamide

Answer

Ibutilide

Answer

Amiodarone

Question 5

McConnell's sign in echocardiography is seen in which condition?

Accepted Answer

Pulmonary Embolism (PE)

Answer

Myocardial Infarction (MI)

Answer

Sarcoidosis

Answer

Hypertrophic Obstructive Cardiomyopathy (HOCM)

Question 6

A 60-year-old marathon runner complains of episodes of dizziness. On auscultation, an ejection systolic murmur is heard. What is the most likely clinical diagnosis?

Accepted Answer

Left Ventricular Hypertrophy with Valvular Aortic Stenosis

Answer

Hypertension with Atrial fibrillation

Answer

Right Ventricular Hypertrophy with Valvular Pulmonic Stenosis

Answer

Brugada Syndrome

Question 7

Which one of the following does not cause pulsus paradoxus?

Accepted Answer

Severe aortic regurgitation

Answer

Cardiac tamponade

Answer

Constrictive pericarditis

Answer

Acute severe bronchial asthma

Question 8

Rheumatic activity involves which valves?

Accepted Answer

Mitral & aortic

Answer

Aortic & tricuspid

Answer

Aortic & pulmonary

Answer

Mitral & tricuspid

Question 9

Which of the following is effective in the management of patients with heart failure with preserved ejection fraction?

Accepted Answer

Angiotensin receptor blocker with neprilysin inhibitor

Answer

Digoxin

Answer

Isosorbide mononitrate

Answer

Phosphodiesterase inhibitor

Question 10

Which of the following valvular heart diseases is most commonly associated with sudden death?

Accepted Answer

Aortic Stenosis

Answer

Mitral Stenosis

Answer

Mitral Regurgitation

Answer

Aortic Regurgitation

Cardiology — MCQs

Cardiology — MCQs

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