Cardiology Practice Questions

Q: A 30-year-old man with an undiagnosed cardiac anomaly has been unable to do strenuous exercise throughout his life. Auscultation demonstrates an early diastolic murmur, which has been present since childhood. The patient has never been cyanotic. Which of the following disorders would most likely cause the patient's findings?

Bicuspid aortic valve. ### Explanation **1. Why Bicuspid Aortic Valve (BAV) is Correct:** The clinical presentation of an **early diastolic murmur** (EDM) indicates **Aortic Regurgitation (AR)** [2], [3]. Bicuspid aortic valve is the most common congenital heart anomaly (1-2% of the population). While it often presents with aortic stenosis in older age [1], it frequently causes aortic insufficiency (regurgitation) in young adults due to cusp prolapse or restricted leaflet motion. Since the patient has been symptomatic since childhood but is **acyanotic**, a left-sided valvular lesion like BAV is the most plausible diagnosis. **2. Why the Other Options are Incorrect:** * **Common pattern TGA (Option B):** This is a cyanotic congenital heart disease (Right-to-Left shunt). Patients present with profound neonatal cyanosis and would not reach age 30 undiagnosed without surgical intervention. * **Patent Ductus Arteriosus (Option C):** PDA typically presents with a **continuous "machinery" murmur** heard best at the left infraclavicular area, not an isolated early diastolic murmur. * **Tricuspid Atresia (Option D):** This is a cyanotic "5T" defect. It requires an ASD and VSD for survival and presents with early childhood cyanosis and left axis deviation on ECG. **3. NEET-PG High-Yield Pearls:** * **BAV Associations:** Most common cause of isolated AR in developed countries; strongly associated with **Coarctation of the Aorta** and Turner Syndrome. * **Murmur Characteristics:** AR produces a high-pitched, blowing EDM heard best at the left sternal border (Erb’s point) with the patient leaning forward in expiration [2], [3]. * **Genetic Link:** Often associated with mutations in the *NOTCH1* gene. * **Complications:** Increased risk of infective endocarditis and aortic dissection (due to cystic medial necrosis).

Q: What is the best management for a hemodynamically stable patient with ECG showing a broad QRS complex with antidromic tachycardia?

Intravenous Procainamide. **Explanation:** The clinical presentation of a **broad QRS complex tachycardia** in a patient with suspected pre-excitation (WPW syndrome) suggests **Antidromic Atrioventricular Reentrant Tachycardia (AVRT)** [2], [3]. In this rhythm, the impulse travels down the accessory pathway (causing the wide QRS) and returns via the AV node. **1. Why Intravenous Procainamide is correct:** Procainamide is the drug of choice for hemodynamically stable wide-complex tachycardias, especially antidromic AVRT. It works by increasing the refractory period of both the atrium and the **accessory pathway**, effectively slowing or blocking conduction through the bypass tract to terminate the arrhythmia [2]. **2. Why the other options are incorrect:** * **Oral Verapamil & Oral Beta-blockers (A & B):** These are contraindicated in wide-complex tachycardias involving an accessory pathway. AV node blockers (Verapamil, Diltiazem, Beta-blockers, Digoxin, and Adenosine) can paradoxically increase conduction through the accessory pathway by removing the "braking" effect of the AV node, potentially leading to Ventricular Fibrillation [1]. Furthermore, oral medications are inappropriate for acute management. * **Cardioversion (C):** While highly effective, synchronized electrical cardioversion is reserved as the **first-line** treatment for patients who are **hemodynamically unstable** (hypotension, altered mental status, chest pain). This patient is stable. **Clinical Pearls for NEET-PG:** * **Narrow QRS (Orthodromic AVRT):** Impulse goes down AV node $\rightarrow$ Treat like SVT (Adenosine) [2]. * **Wide QRS (Antidromic AVRT):** Impulse goes down Accessory Pathway $\rightarrow$ Avoid AV node blockers; use **Procainamide** or **Amiodarone** [2]. * **WPW + Atrial Fibrillation:** Characterized by an "irregularly irregular" wide complex tachycardia [2]. **Procainamide** is the drug of choice; **DC cardioversion** if unstable. Never use Digoxin or Verapamil.

Q: A 64-year-old gentleman presents with severe central chest pain radiating to the left arm for the last 30 minutes. He is profusely sweating and appears to be in agony. Which of the following conditions is he most likely suffering from?

Acute myocardial infarction. **Explanation:** The clinical presentation of severe, crushing central chest pain radiating to the left arm, accompanied by autonomic symptoms like profuse sweating (diaphoresis), is the classic "textbook" description of an **Acute Myocardial Infarction (AMI)** [1]. 1. **Why Option C is Correct:** AMI occurs due to a sudden occlusion of a coronary artery, leading to myocardial necrosis [2]. The pain is typically intense, lasts longer than 20 minutes, and is not relieved by rest or nitroglycerin. The presence of **diaphoresis** is a high-yield sign indicating sympathetic overactivity, which strongly correlates with myocardial ischemia rather than non-cardiac causes [3]. 2. **Why Other Options are Incorrect:** * **Stable Angina:** Pain is typically brief (3–15 minutes), predictable, and triggered by exertion or stress. It is characteristically relieved by rest or sublingual nitrates, unlike the pain described here. * **Oesophagitis:** This usually presents as retrosternal "heartburn" or burning pain, often related to posture (lying down) or food intake. While it can mimic cardiac pain, it rarely causes profuse sweating or radiation to the left arm. * **Pleurisy:** This is characterized by **pleuritic chest pain**—sharp, stabbing pain that is strictly aggravated by inspiration, coughing, or movement. It is not typically central or associated with the systemic agony seen in AMI [4]. **NEET-PG High-Yield Pearls:** * **Levine’s Sign:** A clenched fist held over the chest to describe ischemic pain [1]. * **Silent MI:** Common in elderly patients and diabetics (due to autonomic neuropathy) [3]. * **Gold Standard Investigation:** Coronary Angiography; however, the most immediate initial tests are an **ECG** and **Cardiac Troponins (I or T)**. * **Time is Muscle:** Reperfusion therapy (PCI or Thrombolysis) should be initiated as early as possible to salvage myocardium.

Q: All of the following are true of atrial fibrillation EXCEPT?

Associated with sinus bradycardia. Explanation: Atrial Fibrillation (AF) is a supraventricular tachyarrhythmia characterized by rapid, uncoordinated atrial activation and an ineffective atrial contraction [1]. Why Option D is the correct answer (The Exception): Atrial fibrillation is fundamentally a tachyarrhythmia. In AF, the atrial rate typically ranges from 350–600 bpm [2]. While the ventricular rate depends on AV node conduction, it is usually rapid (tachycardia) unless the patient is on AV-nodal blocking drugs or has underlying conduction system disease [4]. Sinus bradycardia refers to a slow rhythm originating from the SA node; in AF, the SA node is overwhelmed and suppressed by multiple re-entrant wavelets, making the coexistence of a normal sinus rhythm (bradycardic or otherwise) impossible during the arrhythmia. Analysis of Incorrect Options: * Option A: Rheumatic Mitral Stenosis is a classic cause of AF due to left atrial enlargement and fibrosis, which alters the electrophysiological properties of the atrial tissue. * Option B: The lack of effective atrial contraction leads to blood stasis, particularly in the left atrial appendage, significantly increasing the risk of thrombus formation and systemic thromboembolism (e.g., ischemic stroke) [3]. * Option C: Because the AV node is bombarded by irregular atrial impulses, the ventricular response is "random," resulting in the hallmark clinical finding of an irregularly irregularly pulse and a pulse deficit. Clinical Pearls for NEET-PG: * ECG Findings: Absence of P waves, presence of fibrillatory (f) waves, and irregular RR intervals. * Ashman Phenomenon: A long RR interval followed by a short RR interval resulting in an aberrantly conducted QRS (usually RBBB morphology). * Treatment: Hemodynamically unstable patients require immediate synchronized cardioversion. Stable patients are managed with rate control (Beta-blockers/CCBs) and anticoagulation based on the CHA₂DS₂-VASc score [3].

Q: Which murmur increases in intensity with the Valsalva maneuver?

Hypertrophic obstructive cardiomyopathy (HOCM). ### Explanation The **Valsalva maneuver** (specifically the strain phase) increases intrathoracic pressure, which decreases venous return to the heart. This leads to a reduction in Left Ventricular (LV) end-diastolic volume (preload) [2]. **Why HOCM is the correct answer:** In Hypertrophic Obstructive Cardiomyopathy, the murmur is caused by dynamic left ventricular outflow tract (LVOT) obstruction. When the LV volume decreases (due to reduced preload during Valsalva), the hypertrophied interventricular septum and the anterior mitral leaflet come closer together. This **increases the degree of obstruction**, thereby increasing the intensity of the systolic murmur [1]. **Analysis of Incorrect Options:** * **Aortic Stenosis (AS):** Unlike HOCM, AS is a fixed valvular obstruction. Decreased preload means less blood is ejected across the valve, which **decreases** the murmur intensity [3]. * **Ventricular Septal Defect (VSD):** Decreased venous return reduces the volume of blood shunting from left to right, thus **decreasing** the murmur intensity. * **Mitral Stenosis (MS):** Reduced venous return leads to less flow across the stenotic mitral valve, **decreasing** the intensity of the mid-diastolic rumble. **High-Yield Clinical Pearls for NEET-PG:** * **The "Rule of Two":** Only two murmurs **increase** in intensity with Valsalva and Standing (both decrease preload): **HOCM** and **Mitral Valve Prolapse (MVP)**. All other murmurs generally decrease. * **Handgrip Exercise:** Increases afterload. This **decreases** the HOCM murmur (by distending the LV) but **increases** murmurs of AR, MR, and VSD. * **Squatting:** Increases both preload and afterload, which **decreases** the HOCM murmur.

Q: In terms of the cardiac walls viewed by each lead, which of the following is the odd one out?

Lead aVL. To answer this question, one must understand the relationship between ECG leads and the specific anatomical surfaces of the heart they "view." This is a fundamental concept in identifying the location of myocardial infarction (MI) [2]. ### **Explanation of the Correct Answer** The correct answer is **Lead aVL**. Leads are categorized based on the cardiac wall they represent: * **Inferior Wall:** Leads **II, III, and aVF** look at the heart from the bottom (inferior) perspective [4]. * **Lateral Wall:** Leads **I, aVL, V5, and V6** look at the left lateral side of the heart [1]. Since Leads II, III, and aVF all represent the **Inferior Wall**, they form a logical group. **Lead aVL** is the "odd one out" because it represents the **High Lateral Wall**. ### **Analysis of Incorrect Options** * **Lead II (Option A):** This is an inferior lead. It records electrical activity moving toward the positive electrode on the left leg [3]. * **Lead III (Option B):** This is an inferior lead. It records activity between the left arm and left leg [3]. * **Lead aVF (Option D):** The "F" stands for Foot. It is a unipolar limb lead that views the heart directly from the inferior aspect [4]. ### **Clinical Pearls for NEET-PG** * **Blood Supply Correlation:** * **Inferior Wall (II, III, aVF):** Usually supplied by the **Right Coronary Artery (RCA)**. * **Lateral Wall (I, aVL, V5, V6):** Usually supplied by the **Left Circumflex Artery (LCx)**. * **Reciprocal Changes:** In an acute Inferior Wall MI (ST elevation in II, III, aVF), reciprocal ST depression is most commonly seen in **Lead aVL** [2]. * **Septal Leads:** V1 and V2 [1]. * **Anterior Leads:** V3 and V4 (supplied by the Left Anterior Descending artery) [1].

Q: Which of the following conditions is characterized by the absence of P waves on an electrocardiogram?

Atrial fibrillation. ### Explanation **Correct Answer: A. Atrial Fibrillation** In **Atrial Fibrillation (AF)**, the normal organized electrical activity of the SA node is replaced by rapid, chaotic, and disorganized electrical impulses originating from multiple ectopic foci (often near the pulmonary veins). Because the atria do not contract as a single unit but rather "quiver," there is no coordinated atrial depolarization. Consequently, distinct **P waves are absent** on the ECG and are replaced by fine, irregular oscillations called **fibrillatory (f) waves**. The hallmark of AF is an "irregularly irregular" ventricular rhythm. **Analysis of Incorrect Options:** * **B. Congestive Cardiac Failure (CCF):** This is a clinical syndrome of pump failure. While CCF can lead to AF due to atrial stretch, it does not inherently cause the absence of P waves. The ECG may show signs of chamber hypertrophy or underlying ischemia, but P waves are typically present if the rhythm is sinus. * **C. Atrial Flutter:** This is characterized by a "re-entrant" circuit in the right atrium. Instead of absent P waves, it produces regular, rapid, and identical **"saw-tooth" waves** (F waves), usually at a rate of 250–350 bpm. * **D. PSVT:** This typically presents as a narrow-complex tachycardia. While P waves may be difficult to see because they are buried within or immediately follow the QRS complex (due to retrograde conduction), they are technically present or represented by pseudo-S or pseudo-R' waves. **High-Yield NEET-PG Pearls:** * **Atrial Fibrillation:** Look for the triad of **absent P waves**, **irregularly irregular R-R intervals**, and **variable pulse deficit**. * **Ashman Phenomenon:** A long R-R interval followed by a short R-R interval leading to an aberrantly conducted QRS (often RBBB morphology) in AF. * **Hyperkalemia:** Another critical condition where P waves may be absent (or flattened) along with tall tented T waves and widened QRS complexes.

Question 1

A 30-year-old man with an undiagnosed cardiac anomaly has been unable to do strenuous exercise throughout his life. Auscultation demonstrates an early diastolic murmur, which has been present since childhood. The patient has never been cyanotic. Which of the following disorders would most likely cause the patient's findings?

Accepted Answer

Bicuspid aortic valve

Answer

Common pattern transposition of the great arteries

Answer

Patent ductus arteriosus

Answer

Tricuspid atresia

Question 2

What is the best management for a hemodynamically stable patient with ECG showing a broad QRS complex with antidromic tachycardia?

Accepted Answer

Intravenous Procainamide

Answer

Oral Verapamil

Answer

Oral Beta-blocker

Answer

Cardioversion

Question 3

Which sign is characterized by a pansystolic murmur that increases in intensity during deep inspiration?

Accepted Answer

Carvallo's sign

Answer

Muller's sign

Answer

Corrigan's sign

Answer

Duroziez sign

Question 4

A 64-year-old gentleman presents with severe central chest pain radiating to the left arm for the last 30 minutes. He is profusely sweating and appears to be in agony. Which of the following conditions is he most likely suffering from?

Accepted Answer

Acute myocardial infarction

Answer

Stable angina

Answer

Oesophagitis

Answer

Pleurisy

Question 5

All of the following are true of atrial fibrillation EXCEPT?

Accepted Answer

Associated with sinus bradycardia

Answer

Occurs in rheumatic mitral stenosis

Answer

May cause thromboembolic complications

Answer

Pulse is irregularly irregular

Question 6

A 15-year-old boy complains of pain in his legs when he runs more than 300 m. Physical examination shows temperature, 36.8°C; pulse, 76/min; respirations, 22/min; and blood pressure, 165/90 mm Hg. The radial pulses are 4+, and the dorsalis pedis pulses are 1+. Arterial blood gas measurement shows a normal oxygen saturation level. Which of the following congenital cardiovascular anomalies is most likely to be present in this patient?

Accepted Answer

Coarctation of the aorta

Answer

Aortic valve stenosis

Answer

Patent ductus arteriosus

Answer

Transposition of the great arteries

Question 7

A 68-year-old male with a history of hypertension is brought in unconscious. Upon arrival, his blood pressure is recorded as 245/142 mmHg. The physician decides to assess for end-organ damage. Which of the following investigations would be least useful in this assessment?

Accepted Answer

CT pulmonary angiogram

Answer

Serum Creatinine

Answer

12-lead ECG

Answer

Fundoscopy

Question 8

Which murmur increases in intensity with the Valsalva maneuver?

Accepted Answer

Hypertrophic obstructive cardiomyopathy (HOCM)

Answer

Ventricular septal defect (VSD)

Answer

Mitral stenosis (MS)

Answer

Aortic stenosis (AS)

Question 9

In terms of the cardiac walls viewed by each lead, which of the following is the odd one out?

Accepted Answer

Lead aVL

Answer

Lead II

Answer

Lead III

Answer

Lead aVF

Question 10

Which of the following conditions is characterized by the absence of P waves on an electrocardiogram?

Accepted Answer

Atrial fibrillation

Answer

Congestive Cardiac Failure (CCF)

Answer

Atrial flutter

Answer

Paroxysmal Supraventricular Tachycardia (PSVT)

Cardiology — MCQs

Cardiology — MCQs

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