Cardiology — MCQs
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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?
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?
Pulsus paradoxus is seen in which of the following conditions?
Turner's syndrome is maximally associated with which of the following cardiac conditions?
In a patient with chronic atrial fibrillation with a regular ventricular rate of 60/min, what is the most probable cause?
A double apical impulse is seen in which of the following conditions?
Which of the following is NOT a characteristic of right-sided heart failure?
Recurrent ischemic events following thrombosis have been pathophysiologically linked to which of the following?
Coarctation of the aorta is associated with which of the following conditions?
What is the characteristic feature of Rheumatic carditis?
Cardiology Indian Medical PG Practice Questions and MCQs
Question 1101: 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?
- A. Ectopic atrial tachycardia
- B. Atrial flutter with 2:1 AV conduction (Correct Answer)
- C. Sinus tachycardia
- D. Supraventricular tachycardia
Explanation: ### Explanation **Correct Answer: B. Atrial flutter with 2:1 AV conduction** **1. Why it is correct:** Atrial flutter is a macro-reentrant supraventricular tachycardia, most commonly involving the cavotricuspid isthmus. On ECG, it is characterized by regular, rapid atrial waves (F-waves) showing a classic **"sawtooth" pattern**, typically at a rate of 250–350 bpm. In this clinical scenario, the ventricular rate is often exactly half the atrial rate (commonly ~150 bpm) because the AV node cannot conduct every impulse due to its refractory period, resulting in a **2:1 AV conduction**. In a 70-year-old with heart failure symptoms (dyspnea, orthopnea) and cardiomegaly, atrial flutter is a common cause of decompensation. **2. Why the other options are incorrect:** * **A. Ectopic Atrial Tachycardia:** This typically shows a discrete P-wave with an isoelectric baseline between waves, unlike the continuous undulating sawtooth baseline of flutter. * **C. Sinus Tachycardia:** This presents with a normal P-wave morphology (upright in II, III, aVF) followed by a QRS. The rate rarely reaches exactly 150 bpm with the mathematical precision seen in 2:1 flutter. * **D. Supraventricular Tachycardia (AVNRT/AVRT):** These usually present with a very rapid, regular narrow-complex rhythm where P-waves are either buried in the QRS or occur just after it. They lack the flutter waves seen in the baseline. **3. High-Yield Clinical Pearls for NEET-PG:** * **The "150 Rule":** Any narrow complex tachycardia at a regular rate of exactly **150 bpm** is atrial flutter with 2:1 block until proven otherwise. * **Vagal Maneuvers/Adenosine:** These do not terminate atrial flutter but increase the AV block, "unmasking" the underlying sawtooth waves for easier diagnosis. * **Treatment:** Rate control (Beta-blockers/CCBs), anticoagulation (based on CHADS₂-VASc), and definitive management via **Radiofrequency Ablation** (treatment of choice for recurrent flutter).
Question 1102: 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?
- A. Statins
- B. Fibrates
- C. Nicotinic acid
- D. All of the above (Correct Answer)
Explanation: ### Explanation The correct answer is **D. All of the above**. This patient presents with a high-risk profile for cardiovascular disease (CVD) due to the coexistence of **Hypertension, Type 2 Diabetes Mellitus (T2DM), and Hypercholesterolemia** (5.8 mmol/L is approximately 224 mg/dL). In such patients, aggressive lipid management is required to reduce the risk of major adverse cardiovascular events (MACE). **1. Why the correct answer is right:** * **Statins (HMG-CoA Reductase Inhibitors):** These are the **first-line agents** for lipid-lowering therapy in diabetic patients. They primarily reduce LDL-C and have proven mortality benefits [2]. Statins act by inhibiting HMG-CoA reductase and up-regulating LDL receptor activity [3]. * **Fibrates (PPAR-α agonists):** These are particularly effective in patients with T2DM who often exhibit "Diabetic Dyslipidemia" (high triglycerides and low HDL). They stimulate peroxisome proliferator activated receptor (PPAR) alpha, which reduces TG synthesis and enhances lipoprotein lipase [1]. * **Nicotinic Acid (Niacin):** While less commonly used now due to side effects (flushing), it remains a potent agent for increasing HDL-C and lowering VLDL/LDL [3]. It can be used as an adjunct in refractory cases, though it requires caution when combined with statins [1]. **2. Analysis of Options:** Since all three classes of drugs are pharmacologically indicated for managing different components of the lipid profile in a diabetic/hypertensive patient, "All of the above" is the most appropriate choice. **3. NEET-PG High-Yield Pearls:** * **Target LDL in Diabetes:** For patients aged 40–75 with T2DM, moderate-intensity statin therapy is indicated regardless of the baseline LDL level. * **Diabetic Dyslipidemia Triad:** High Triglycerides, Low HDL, and a preponderance of **Small Dense LDL** particles. * **Statin + Fibrate Caution:** Combining Statins with Gemfibrozil significantly increases the risk of **myopathy/rhabdomyolysis** [2]. * **Niacin Side Effect:** Can cause hyperglycemia (insulin resistance) and hyperuricemia; however, it is not strictly contraindicated in diabetes but requires monitoring.
Question 1103: Pulsus paradoxus is seen in which of the following conditions?
- A. Shock
- B. Elderly
- C. Emphysema/Asthma (Correct Answer)
- D. High output state
Explanation: **Explanation:** **Pulsus Paradoxus** is defined as an exaggerated fall in systolic blood pressure (>10 mmHg) during inspiration. While the name suggests a "paradox," it is actually an exaggeration of the normal physiological decline in blood pressure during inspiration. **Why Emphysema/Asthma is correct:** In severe obstructive airway diseases like **Asthma or Emphysema**, there are extreme fluctuations in intrathoracic pressure [1]. During inspiration, the intrapleural pressure becomes markedly negative to overcome airway resistance [1]. This negative pressure is transmitted to the heart and great vessels, leading to: 1. Increased venous return to the right heart, causing the interventricular septum to bulge into the left ventricle (ventricular interdependence), reducing left ventricular stroke volume. 2. Pooling of blood in the expanded pulmonary vasculature, further decreasing left ventricular filling. **Analysis of Incorrect Options:** * **A. Shock:** While pulses may be weak (pulsus parvus), pulsus paradoxus is not a characteristic feature of general shock unless caused specifically by cardiac tamponade. * **B. Elderly:** Aging is associated with arterial stiffness, which typically increases systolic blood pressure and pulse pressure, rather than causing inspiratory fluctuations. * **D. High output state:** Conditions like thyrotoxicosis or anemia lead to a hyperdynamic circulation and a "bounding pulse" (water-hammer pulse), not pulsus paradoxus. **NEET-PG High-Yield Pearls:** * **Most Common Cause:** Cardiac Tamponade (Classic triad: Hypotension, JVD, Muffled heart sounds). * **Non-Cardiac Causes:** Severe Asthma, COPD, Tension Pneumothorax, Massive Pulmonary Embolism [2]. * **Important Exception:** Pulsus paradoxus is **absent** in cardiac tamponade if there is co-existing Aortic Regurgitation or Atrial Septal Defect (ASD). * **Reverse Pulsus Paradoxus:** Seen in Hypertrophic Obstructive Cardiomyopathy (HOCM) and patients on positive pressure ventilation [2].
Question 1104: Turner's syndrome is maximally associated with which of the following cardiac conditions?
- A. Aortic stenosis
- B. Coarctation of the aorta (Correct Answer)
- C. Ventricular septal defect (VSD)
- D. Mitral valve prolapse
Explanation: ### Explanation **Turner’s Syndrome (45, XO)** is a genetic condition characterized by the complete or partial absence of one X chromosome [3]. It is highly associated with specific left-sided obstructive cardiac lesions due to abnormal lymphatic development during embryogenesis. **Why Coarctation of the Aorta is Correct:** Coarctation of the aorta (pre-ductal or juxta-ductal) is the most classic cardiovascular association, occurring in approximately **15-20%** of patients with Turner’s syndrome [2]. The underlying mechanism is thought to be related to altered hemodynamics in utero caused by lymphatic obstruction (cystic hygromas), which leads to reduced blood flow through the left heart and subsequent narrowing of the aortic arch. **Analysis of Incorrect Options:** * **A. Aortic Stenosis:** While Turner’s syndrome is associated with **Bicuspid Aortic Valve (BAV)**—which is actually the *most common* overall cardiac anomaly (30%)—BAV often leads to aortic stenosis later in life. However, Coarctation remains the more "characteristic" association frequently tested in exams. * **C. Ventricular Septal Defect (VSD):** VSD is the most common congenital heart disease (CHD) in the general population and is strongly associated with **Down Syndrome**, not Turner’s [1]. * **D. Mitral Valve Prolapse:** This is more commonly associated with connective tissue disorders like **Marfan Syndrome** or Ehlers-Danlos Syndrome [2]. **High-Yield Clinical Pearls for NEET-PG:** 1. **Most Common Anomaly:** Bicuspid Aortic Valve (30%). 2. **Most Characteristic/Classic Association:** Coarctation of the aorta [2]. 3. **Aortic Dissection:** Turner’s patients have a significantly increased risk of aortic dissection (even without hypertension), often preceded by aortic root dilation. 4. **Physical Exam:** Look for "radio-femoral delay" and "rib notching" on X-ray in cases of Coarctation [2]. 5. **Screening:** All girls diagnosed with Turner’s syndrome must undergo an initial screening **Echocardiogram** and/or Cardiac MRI to rule out these anomalies.
Question 1105: In a patient with chronic atrial fibrillation with a regular ventricular rate of 60/min, what is the most probable cause?
- A. Sleep apnea
- B. Digitalis toxicity (Correct Answer)
- C. Sinoatrial node block
- D. Hypothyroidism
Explanation: **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.
Question 1106: A double apical impulse is seen in which of the following conditions?
- A. Aortic stenosis (AS) and Aortic regurgitation (AR)
- B. Tricuspid regurgitation (TR) and Tricuspid stenosis (TS)
- C. Mitral insufficiency (MI)
- D. Hypertrophic obstructive cardiomyopathy (HOCM) (Correct Answer)
Explanation: ### 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.
Question 1107: Which of the following is NOT a characteristic of right-sided heart failure?
- A. Pulmonary edema (Correct Answer)
- B. Ascites
- C. Oliguria
- D. Dependent edema
Explanation: ### Explanation The fundamental concept in heart failure is that symptoms occur **upstream** of the failing ventricle. **1. Why "Pulmonary Edema" is the Correct Answer:** Pulmonary edema is a hallmark of **Left-Sided Heart Failure (LHF)** [1]. When the left ventricle fails to pump blood into the systemic circulation, pressure rises in the left atrium and subsequently in the pulmonary veins and capillaries. This increased hydrostatic pressure forces fluid into the alveolar spaces, causing pulmonary edema [2]. In isolated Right-Sided Heart Failure (RHF), the lungs are typically "protected" from congestion because the right ventricle is unable to pump blood forward into the pulmonary vasculature. **2. Analysis of Incorrect Options (Characteristics of RHF):** * **Ascites & Dependent Edema:** In RHF, blood backs up into the systemic venous system (superior and inferior vena cava). Increased systemic venous pressure leads to fluid extravasation into the interstitial spaces, manifesting as pedal edema (dependent) and fluid accumulation in the peritoneal cavity (ascites) [1]. * **Oliguria:** This occurs in both LHF and RHF. In RHF, decreased forward flow to the lungs leads to reduced left ventricular filling (preload), resulting in low cardiac output. Reduced renal perfusion activates the Renin-Angiotensin-Aldosterone System (RAAS), causing water retention and decreased urine output. **3. NEET-PG High-Yield Pearls:** * **Most common cause of RHF:** Left-sided heart failure (due to secondary pulmonary hypertension). * **Most common cause of isolated RHF:** Chronic Obstructive Pulmonary Disease (COPD) leading to *Cor Pulmonale* [3]. * **Clinical Signs of RHF:** Raised Jugular Venous Pressure (JVP), Hepatojugular reflux, Nutmeg liver (congestive hepatomegaly), and Anasarca [3]. * **Bernheim Effect:** A rare condition where a severely hypertrophied interventricular septum (from LHF) bulges into the right ventricle, causing RHF symptoms without pulmonary congestion.
Question 1108: Recurrent ischemic events following thrombosis have been pathophysiologically linked to which of the following?
- A. Antibodies to thrombolytic agents
- B. Fibrinopeptide A
- C. Lipoprotein A (Correct Answer)
- D. Triglycerides
Explanation: **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].
Question 1109: Coarctation of the aorta is associated with which of the following conditions?
- A. Ventricular Septal Defect (VSD)
- B. Patent Ductus Arteriosus (PDA)
- C. Bicuspid aortic valve (Correct Answer)
- D. None of the above
Explanation: 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.
Question 1110: What is the characteristic feature of Rheumatic carditis?
- A. Pericarditis
- B. Endocarditis
- C. Myocarditis
- D. Pancarditis (Correct Answer)
Explanation: **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.
Practice by Chapter
Coronary Artery Disease and Angina
Practice Questions
Acute Coronary Syndromes
Practice Questions
Heart Failure
Practice Questions
Cardiac Arrhythmias
Practice Questions
Valvular Heart Diseases
Practice Questions
Cardiomyopathies
Practice Questions
Pericardial Diseases
Practice Questions
Congenital Heart Disease in Adults
Practice Questions
Hypertension and Hypertensive Emergencies
Practice Questions
Pulmonary Hypertension
Practice Questions
Non-invasive Cardiac Diagnostics
Practice Questions
Preventive Cardiology
Practice Questions
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