Cardiology Practice Questions

Q: In a patient with chronic atrial fibrillation with a regular ventricular rate of 60/min, what is the most probable cause?

Digitalis toxicity. **Explanation:** The hallmark of **Atrial Fibrillation (AF)** is an "regularly irregular" ventricular rhythm due to the random conduction of disorganized atrial impulses through the AV node [1]. When the rhythm becomes **regular** in a patient with known AF, it indicates that the atrial impulses are no longer reaching the ventricles. This phenomenon is known as **"Regularization of Atrial Fibrillation."** The most common cause for this is **complete AV block** with a junctional or ventricular escape rhythm [2]. In clinical practice, especially in the context of NEET-PG, this is a classic sign of **Digitalis (Digoxin) toxicity**. Digoxin increases vagal tone and directly suppresses the AV node; at toxic levels, it can induce a high-grade or complete heart block, leading to a steady, slow escape rhythm (typically 40–60 bpm) [4]. **Analysis of Incorrect Options:** * **A. Sleep Apnea:** While associated with AF, it typically causes nocturnal bradycardia or pauses, not a persistent, regularized rhythm in a chronic AF patient. * **C. Sinoatrial (SA) Node Block:** In AF, the SA node is already non-functional as the pacemaker; therefore, SA block would not change the underlying irregular ventricular response [3]. * **D. Hypothyroidism:** This can cause sinus bradycardia, but in a patient with AF, the rhythm would remain irregular unless a complete heart block occurs (which is much less common than in Digoxin toxicity). **High-Yield Clinical Pearls:** * **Bidirectional Ventricular Tachycardia** is another highly specific ECG finding for Digoxin toxicity. * **Hypokalemia** predisposes a patient to Digoxin toxicity because potassium and digoxin compete for the same binding site on the Na+/K+ ATPase pump. * **Treatment:** Digoxin-specific antibody fragments (DigiFab) are the definitive management for life-threatening toxicity.

Q: A double apical impulse is seen in which of the following conditions?

Hypertrophic obstructive cardiomyopathy (HOCM). ### Explanation **Correct Answer: D. Hypertrophic obstructive cardiomyopathy (HOCM)** In HOCM, a **double apical impulse** (also known as a biphid or double-beating apex) is a classic clinical finding. It consists of: 1. **A prominent presystolic pulsation:** Caused by a forceful atrial contraction (S4) against a stiff, non-compliant hypertrophied left ventricle. 2. **The systolic thrust:** The actual ventricular contraction. In some cases of HOCM, a **triple apical impulse** may occur if there is also a "systolic bulge" due to the dynamic left ventricular outflow tract (LVOT) obstruction, creating a "pulsus bisferiens" equivalent at the apex. **Analysis of Incorrect Options:** * **A. Aortic Stenosis (AS) and Aortic Regurgitation (AR):** AS typically presents with a **heaving (sustained)** apical impulse due to concentric LV hypertrophy. AR presents with a **hyperdynamic (hyperkinetic)**, displaced apex due to volume overload. Neither typically produces a double impulse at the apex. * **B. Tricuspid Regurgitation (TR) and Tricuspid Stenosis (TS):** These are right-sided lesions. While severe TR can cause a "pansystolic" heave, it is felt at the **left parasternal area** (RV heave), not the apex. * **C. Mitral Insufficiency (MI):** Chronic MI leads to a hyperdynamic and laterally displaced apex due to LV dilatation, but it remains a single impulse. **High-Yield Clinical Pearls for NEET-PG:** * **Triple Apical Impulse:** Pathognomonic for **HOCM**. * **Pulsus Bisferiens:** A double-peaked **arterial** pulse (carotid) seen in **AR + AS** or **HOCM**. * **Dynamic Auscultation in HOCM:** The systolic murmur **increases** with Valsalva and standing (decreased preload) and **decreases** with squatting or handgrip (increased afterload/preload). * **S4** is almost always present in HOCM due to decreased ventricular compliance.

Q: Recurrent ischemic events following thrombosis have been pathophysiologically linked to which of the following?

Lipoprotein A. **Explanation:** **Lipoprotein (a) [Lp(a)]** is the correct answer because it possesses a unique structural homology with **plasminogen** [3]. Lp(a) consists of an LDL-like particle bound to apolipoprotein(a) [3]. Due to its similarity to plasminogen, it competitively inhibits the binding of plasminogen to fibrin and endothelial cell receptors [2][3]. This inhibition impairs fibrinolysis (the breakdown of clots), leading to a pro-thrombotic state [3]. Consequently, patients with elevated Lp(a) are at a significantly higher risk for recurrent ischemic events and "rebound" thrombosis following an initial vascular insult [3]. **Analysis of Incorrect Options:** * **Antibodies to thrombolytic agents:** While antibodies (e.g., anti-streptokinase) can neutralize the efficacy of specific drugs, they do not represent the primary pathophysiological mechanism for generalized recurrent ischemic events across the population [1]. * **Fibrinopeptide A:** This is a marker of active thrombin generation and fibrin formation. While it indicates an ongoing clotting process, it is a *product* of thrombosis rather than the underlying structural driver of recurrence. * **Triglycerides:** While hypertriglyceridemia is a risk factor for atherosclerosis, it does not have the direct anti-fibrinolytic properties that link Lp(a) specifically to recurrent thrombotic events. **Clinical Pearls for NEET-PG:** * **Lp(a) Level:** Levels are genetically determined and remain relatively constant throughout life; they are not significantly affected by diet or statins. * **Niacin and PCSK9 inhibitors** are known to lower Lp(a) levels, though clinical outcomes are still being studied. * **High-Yield Association:** Elevated Lp(a) is an independent risk factor for premature coronary artery disease (CAD) and calcific aortic stenosis [3].

Q: Coarctation of the aorta is associated with which of the following conditions?

Bicuspid aortic valve. Coarctation of the aorta (CoA) is a localized narrowing of the aortic lumen, typically occurring near the insertion of the ductus arteriosus. The most common cardiac anomaly associated with CoA is a **Bicuspid Aortic Valve (BAV)**, which is present in approximately **50% to 85%** of cases. This association is so strong that any patient diagnosed with CoA must be screened for BAV and vice-versa. Both conditions are thought to arise from a common developmental defect in the migration of neural crest cells or altered hemodynamics during fetal life. **Why incorrect options are wrong:** * **A. Ventricular Septal Defect (VSD):** While VSD can occur in complex congenital heart disease, it is not the *most* characteristic association for isolated CoA. VSD is more commonly associated with conditions like Tetralogy of Fallot or Down Syndrome. * **B. Patent Ductus Arteriosus (PDA):** PDA is frequently seen in "Infantile" (pre-ductal) coarctation to maintain systemic flow, but it is considered a compensatory mechanism or a co-existing feature rather than the primary associated structural valve defect that defines the classic association. **NEET-PG High-Yield Pearls:** * **Turner Syndrome:** Approximately 10-15% of females with Turner Syndrome (45, XO) have Coarctation of the Aorta [1]. * **Clinical Sign:** "Radio-femoral delay" and hypertension in the upper extremities with hypotension in the lower extremities [1]. * **Chest X-ray:** Look for the **"3" sign** (indentation of the aorta) and **rib notching** (due to collateral flow through intercostal arteries; usually involves ribs 3-8). * **Associated Risk:** Patients have an increased incidence of **Berry aneurysms** (Circle of Willis), leading to a higher risk of subarachnoid hemorrhage.

Q: What is the characteristic feature of Rheumatic carditis?

Pancarditis. **Explanation:** Acute Rheumatic Fever (ARF) is a multisystem autoimmune response following a Group A Streptococcal pharyngeal infection. The hallmark of cardiac involvement in ARF is **Pancarditis**, meaning it involves all three layers of the heart simultaneously: the endocardium, myocardium, and pericardium [1]. * **Why Pancarditis is correct:** While any single layer can be affected, the characteristic pathological feature of Rheumatic Heart Disease is the involvement of the entire heart [1]. This is evidenced clinically by valvular regurgitation (Endocarditis), tachycardia out of proportion to fever or heart failure (Myocarditis), and friction rubs or effusion (Pericarditis) [1]. **Analysis of Incorrect Options:** * **Endocarditis (B):** Although the endocardium (specifically the valves) is the most commonly affected layer and leads to long-term morbidity (mitral stenosis), selecting only endocarditis ignores the concurrent involvement of other layers during the acute phase [2]. * **Myocarditis (C):** Myocarditis is responsible for the characteristic **Aschoff bodies** (pathognomonic microscopic lesions) and can cause heart failure, but it occurs alongside endocardial involvement. * **Pericarditis (A):** This is the least common component of the triad and rarely occurs in isolation in ARF. It typically manifests as a "bread and butter" fibrinous pericarditis [1]. **High-Yield Clinical Pearls for NEET-PG:** * **Pathognomonic sign:** **Aschoff bodies** (granulomatous lesions with Anitschkow "caterpillar" cells) found in the myocardium. * **Most common valve involved:** Mitral valve (followed by the Aortic valve) [2]. * **Early lesion:** Mitral Regurgitation; **Late/Chronic lesion:** Mitral Stenosis [2]. * **Jones Criteria:** Carditis is a **Major** criterion for diagnosis. * **Carey Coombs Murmur:** A short mid-diastolic murmur heard in acute rheumatic carditis due to mitral valvulitis.

Question 1

A 70-year-old man presents with dyspnea, orthopnea, and paroxysmal nocturnal dyspnea. His past medical history includes hypertension, type 2 diabetes, chronic kidney disease, and hypothyroidism. His medications include furosemide, enalapril, atorvastatin, metformin, and insulin. Physical examination reveals generalized cardiomegaly, and pulmonary and systemic venous hypertension. The ECG is shown in Figure below. What is the cardiac rhythm seen on the ECG?

Accepted Answer

Atrial flutter with 2:1 AV conduction

Answer

Ectopic atrial tachycardia

Answer

Sinus tachycardia

Answer

Supraventricular tachycardia

Question 2

A 50-year-old male patient presents for a routine checkup. He has a history of hypertension and type 2 diabetes. Laboratory investigations reveal plasma cholesterol levels of 5.8 mmol/L and a random blood sugar of 180 mg/dL. Which of the following agents can be used in this patient?

Accepted Answer

All of the above

Answer

Statins

Answer

Fibrates

Answer

Nicotinic acid

Question 3

Pulsus paradoxus is seen in which of the following conditions?

Accepted Answer

Emphysema/Asthma

Answer

Shock

Answer

Elderly

Answer

High output state

Question 4

Turner's syndrome is maximally associated with which of the following cardiac conditions?

Accepted Answer

Coarctation of the aorta

Answer

Aortic stenosis

Answer

Ventricular septal defect (VSD)

Answer

Mitral valve prolapse

Question 5

In a patient with chronic atrial fibrillation with a regular ventricular rate of 60/min, what is the most probable cause?

Accepted Answer

Digitalis toxicity

Answer

Sleep apnea

Answer

Sinoatrial node block

Answer

Hypothyroidism

Question 6

A double apical impulse is seen in which of the following conditions?

Accepted Answer

Hypertrophic obstructive cardiomyopathy (HOCM)

Answer

Aortic stenosis (AS) and Aortic regurgitation (AR)

Answer

Tricuspid regurgitation (TR) and Tricuspid stenosis (TS)

Answer

Mitral insufficiency (MI)

Question 7

Which of the following is NOT a characteristic of right-sided heart failure?

Accepted Answer

Pulmonary edema

Answer

Ascites

Answer

Oliguria

Answer

Dependent edema

Question 8

Recurrent ischemic events following thrombosis have been pathophysiologically linked to which of the following?

Accepted Answer

Lipoprotein A

Answer

Antibodies to thrombolytic agents

Answer

Fibrinopeptide A

Answer

Triglycerides

Question 9

Coarctation of the aorta is associated with which of the following conditions?

Accepted Answer

Bicuspid aortic valve

Answer

Ventricular Septal Defect (VSD)

Answer

Patent Ductus Arteriosus (PDA)

Answer

None of the above

Question 10

What is the characteristic feature of Rheumatic carditis?

Accepted Answer

Pancarditis

Answer

Pericarditis

Answer

Endocarditis

Answer

Myocarditis

Cardiology — MCQs

Cardiology — MCQs

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