Cardiology — MCQs
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What is the most likely cardiac lesion in a young adult who complains of headache, dizziness, and intermittent claudication with exercise?
Which of the following is NOT used in the treatment of cyanotic spells in a patient with Tetralogy of Fallot?
What is the most common type of Ventricular Septal Defect (VSD)?
The 'figure of eight' sign on chest radiography is typically seen in which of the following conditions?
Left-sided endocarditis is most commonly associated with which of the following cardiac conditions?
A two-month-old infant presents with marked respiratory distress. Examination reveals cyanosis, bilateral crepitations, heart rate of 180/min, respiratory rate of 56/min, and a liver span of 7.5 cm. The child has a history of repeated episodes of fever, cough, and respiratory distress since birth. Cardiovascular examination shows a grade III ejection systolic murmur in the left parasternal area. Chest X-ray reveals cardiomegaly with a narrow base and plethoric lung fields. What is the most likely diagnosis?
An atrial septal defect patient with a murmur similar to mitral regurgitation and left axis deviation of 40 degrees is likely experiencing which of the following?
Which finding best indicates an interatrial septal defect with other cardiac abnormalities?
A 9-month-old child born to a diabetic mother presents with tachypnea and hepatomegaly. Echocardiography showed normal cardiac morphology with asymmetric septal hypertrophy. What is the recommended treatment for this child?
Which of the following is NOT typically seen in William syndrome?
Cardiology Indian Medical PG Practice Questions and MCQs
Question 211: What is the most likely cardiac lesion in a young adult who complains of headache, dizziness, and intermittent claudication with exercise?
- A. Tetralogy of Fallot (TOF)
- B. Atrial Septal Defect (ASD)
- C. Patent Ductus Arteriosus (PDA)
- D. Coarctation of the aorta (Correct Answer)
Explanation: **Explanation:** The clinical presentation of **headache, dizziness, and intermittent claudication** in a young adult is a classic triad for **Coarctation of the Aorta (CoA)**. **1. Why Coarctation of the Aorta is correct:** CoA is a localized narrowing of the aorta, typically distal to the origin of the left subclavian artery (juxtaductal). This creates a pressure gradient: * **Proximal to the obstruction:** Hypertension occurs in the upper body, leading to **headaches, dizziness, and epistaxis**. * **Distal to the obstruction:** Hypotension and reduced blood flow occur in the lower body, causing **intermittent claudication** (leg pain during exercise) and cold extremities. * **Physical Exam:** The hallmark is **radio-femoral delay** and a significant blood pressure difference between the upper and lower limbs. **2. Why the other options are incorrect:** * **Tetralogy of Fallot (TOF):** A cyanotic heart disease characterized by "Tet spells" and squatting. It does not typically cause upper body hypertension or claudication. * **Atrial Septal Defect (ASD):** Usually asymptomatic in childhood; presents in adulthood with dyspnea, palpitations, or paradoxical embolism. It features a **fixed split S2**. * **Patent Ductus Arteriosus (PDA):** Characterized by a **continuous machinery murmur** and bounding pulses. It does not cause a pressure differential between the arms and legs. **High-Yield Clinical Pearls for NEET-PG:** * **Chest X-ray:** Look for the **"3" sign** (indentation of the aorta) and **rib notching** (due to collateral flow through intercostal arteries). * **Association:** Strongly associated with **Turner Syndrome** (bicuspid aortic valve is the most common associated cardiac anomaly). * **Diagnosis:** Echocardiography is initial; CT Angiography is the gold standard for anatomy.
Question 212: Which of the following is NOT used in the treatment of cyanotic spells in a patient with Tetralogy of Fallot?
- A. Phenylephrine
- B. Propranolol
- C. Calcium chloride (Correct Answer)
- D. Sodium bicarbonate
Explanation: **Explanation:** The management of a cyanotic spell (Tet spell) in Tetralogy of Fallot (TOF) focuses on two primary goals: **increasing systemic vascular resistance (SVR)** and **decreasing pulmonary vascular resistance (PVR)** to reverse the right-to-left shunt. **Why Calcium Chloride is the correct answer:** Calcium chloride is a positive inotrope. In TOF, cyanotic spells are often triggered by infundibular spasms (spasm of the right ventricular outflow tract). Increasing myocardial contractility with calcium can worsen this infundibular obstruction, thereby exacerbating the right-to-left shunt and worsening cyanosis. Therefore, it is **not** used in the management of acute spells. **Analysis of incorrect options:** * **Phenylephrine (A):** This is a potent alpha-1 agonist that increases SVR. By raising systemic pressure, it forces blood from the right ventricle into the pulmonary artery rather than through the VSD, improving oxygenation. * **Propranolol (B):** A beta-blocker used to relax the infundibular muscle spasm and reduce the heart rate, which improves right ventricular filling and pulmonary blood flow. * **Sodium Bicarbonate (D):** Used to correct metabolic acidosis resulting from prolonged hypoxia. Correcting acidosis is crucial as it reduces the respiratory drive and decreases PVR. **High-Yield Clinical Pearls for NEET-PG:** * **First-line management:** Knee-chest position (increases SVR by kinking femoral arteries). * **Drug of choice for sedation:** Morphine (suppresses the respiratory center and reduces hyperpnea). * **Definitive treatment:** Surgical repair (Blalock-Taussig shunt or total correction). * **Classic X-ray finding:** Boot-shaped heart (Coeur en sabot) due to RVH and upturned apex.
Question 213: What is the most common type of Ventricular Septal Defect (VSD)?
- A. Membranous (Correct Answer)
- B. Muscular
- C. Multiple
- D. None
Explanation: **Explanation:** Ventricular Septal Defect (VSD) is the most common congenital heart disease (CHD) at birth. The ventricular septum is a complex structure divided into a small superior membranous portion and a large inferior muscular portion. **Why Membranous is Correct:** **Membranous VSDs** (specifically perimembranous) are the most common type, accounting for approximately **70-80%** of all cases. They occur in the membranous part of the interventricular septum, located just below the aortic valve and near the tricuspid valve. Their high frequency is due to the complex embryological fusion of the endocardial cushions, the interventricular septum, and the conotruncal septum in this specific region. **Why Other Options are Incorrect:** * **Muscular VSD:** These occur in the lower, muscular part of the septum. While they are the most common type to undergo **spontaneous closure**, they account for only about 5-20% of clinically significant VSDs. * **Multiple VSDs:** Often referred to as "Swiss-cheese" defects, these are multiple openings in the muscular septum. They are relatively rare compared to isolated membranous defects. **High-Yield Clinical Pearls for NEET-PG:** * **Most common CHD overall:** VSD (excluding bicuspid aortic valve). * **Most common VSD to close spontaneously:** Muscular VSD. * **Most common VSD in Down Syndrome:** Atrioventricular canal defect (Endocardial cushion defect). * **Clinical Sign:** A harsh, holosystolic (pansystolic) murmur best heard at the left lower sternal border. * **Eisenmenger Syndrome:** Occurs when a long-standing left-to-right shunt leads to pulmonary hypertension, causing the shunt to reverse (right-to-left), resulting in cyanosis.
Question 214: The 'figure of eight' sign on chest radiography is typically seen in which of the following conditions?
- A. Total Anomalous Pulmonary Venous Connection (TAPVC) (Correct Answer)
- B. Transposition of Great Arteries (TGA)
- C. Tetralogy of Fallot (TOF)
- D. Ebstein Anomaly
Explanation: ### Explanation The **'Figure of 8' sign** (also known as the **Snowman sign** or **Cottage loaf sign**) is the classic radiographic hallmark of **Supracardiac Total Anomalous Pulmonary Venous Connection (TAPVC)**. #### 1. Why TAPVC is Correct In supracardiac TAPVC, all four pulmonary veins drain into a common pulmonary vein, which then drains into the **Left Innominate (Brachiocephalic) vein** via a vertical vein. This eventually empties into the **Superior Vena Cava (SVC)**. * The **upper loop** of the "8" is formed by the dilated vertical vein (left), the left innominate vein (top), and the dilated SVC (right). * The **lower loop** is formed by the normal heart shadow (right atrium). * *Note:* This sign is usually not seen in the neonatal period as it takes time for the vessels to dilate; it typically appears after 4–6 weeks of life. #### 2. Why Other Options are Incorrect * **Transposition of Great Arteries (TGA):** Characterized by the **'Egg-on-a-string'** appearance due to a narrow mediastinum (caused by thymic atrophy and the anteroposterior relationship of the great vessels). * **Tetralogy of Fallot (TOF):** Characterized by the **'Boot-shaped heart' (Coeur en Sabot)** due to right ventricular hypertrophy (lifting the apex) and a concave pulmonary segment. * **Ebstein Anomaly:** Characterized by a **'Box-shaped heart'** (massive cardiomegaly) due to severe right atrial enlargement. #### 3. NEET-PG High-Yield Pearls * **TAPVC Types:** Supracardiac (most common, Figure of 8), Cardiac (drains to coronary sinus), and Infracardiac (most severe, associated with pulmonary venous obstruction and a "normal-sized" heart with pulmonary edema). * **Scimitar Sign:** Seen in **Partial** Anomalous Pulmonary Venous Return (PAPVR), where an anomalous vein drains the right lung into the IVC. * **Sitting Duck Sign:** Another name for the TGA appearance.
Question 215: Left-sided endocarditis is most commonly associated with which of the following cardiac conditions?
- A. Endocardial cushion defect
- B. Atrial septal defect of the secundum type
- C. Atrial septal defect of the primum type
- D. Patent foramen ovale (Correct Answer)
Explanation: **Explanation:** The risk of **Infective Endocarditis (IE)** is determined by the degree of turbulence created by blood flow across a pressure gradient. High-velocity jets or turbulent flow can damage the endocardium, leading to the formation of non-bacterial thrombotic endocarditis (NBTE), which serves as a nidus for bacteria. **Why Patent Foramen Ovale (PFO) is the correct answer:** While PFO is often considered a low-risk lesion for endocarditis, among the options provided, it is the one most uniquely associated with **left-sided endocarditis** via the mechanism of **paradoxical embolism**. In patients with a PFO, an infected thrombus (septic embolus) from the venous system can bypass the lungs and cross directly into the left atrium and ventricle, seeding the mitral or aortic valves. Furthermore, recent studies and clinical guidelines highlight that PFO, especially when associated with an atrial septal aneurysm, creates enough localized turbulence to increase the risk of left-sided vegetations compared to simple secundum ASDs. **Analysis of Incorrect Options:** * **B. Atrial Septal Defect (Secundum type):** This is the most common type of ASD. It is classically considered the **lowest risk** lesion for IE because the pressure gradient between the atria is minimal, resulting in low-velocity, non-turbulent flow. * **C. Atrial Septal Defect (Primum type) & A. Endocardial Cushion Defect:** These are more complex lesions often associated with Down Syndrome. While they carry a higher risk than secundum ASDs (due to associated mitral valve clefts), they are less commonly associated with isolated left-sided endocarditis compared to the paradoxical seeding mechanism seen in PFO. **High-Yield Clinical Pearls for NEET-PG:** * **Highest risk lesions for IE:** Prosthetic valves, prior history of IE, and Cyanotic Congenital Heart Disease (e.g., TOF). * **Lowest risk lesion:** Secundum ASD (IE prophylaxis is NOT recommended). * **Commonest valve involved in IE (General):** Mitral Valve. * **Commonest valve in IV Drug Users:** Tricuspid Valve (Right-sided). * **Commonest organism (Subacute):** *Viridans streptococci*. * **Commonest organism (Acute/IVDU):** *Staphylococcus aureus*.
Question 216: A two-month-old infant presents with marked respiratory distress. Examination reveals cyanosis, bilateral crepitations, heart rate of 180/min, respiratory rate of 56/min, and a liver span of 7.5 cm. The child has a history of repeated episodes of fever, cough, and respiratory distress since birth. Cardiovascular examination shows a grade III ejection systolic murmur in the left parasternal area. Chest X-ray reveals cardiomegaly with a narrow base and plethoric lung fields. What is the most likely diagnosis?
- A. Congenital methemoglobinemia
- B. Transposition of great arteries (Correct Answer)
- C. Cystic fibrosis
- D. Tetralogy of Fallot
Explanation: **Explanation:** The clinical presentation points toward **Transposition of the Great Arteries (TGA)**, specifically a D-TGA with an associated Ventricular Septal Defect (VSD). **Why TGA is the correct answer:** 1. **Cyanosis with Plethora:** TGA is a cyanotic congenital heart disease (CCHD) characterized by increased pulmonary blood flow (plethora). This distinguishes it from Tetralogy of Fallot (TOF), which presents with oligemic lung fields. 2. **Chest X-ray Findings:** The "narrow base" (or "narrow mediastinum") is a classic sign caused by the anteroposterior alignment of the great vessels and thymic atrophy. This, combined with cardiomegaly, creates the classic **"Egg-on-a-string" appearance**. 3. **Congestive Heart Failure (CHF):** The presence of crepitations, hepatomegaly (liver span 7.5 cm), and tachycardia indicates CHF, which occurs early in TGA with VSD due to massive pulmonary over-circulation. 4. **Murmur:** The grade III ejection systolic murmur suggests an associated VSD or pulmonary stenosis, which often allows for the mixing of blood necessary for survival beyond the neonatal period. **Why other options are incorrect:** * **Congenital Methemoglobinemia:** Presents with "chocolate-colored" cyanosis that does not improve with oxygen, but it does not cause cardiomegaly, murmurs, or pulmonary plethora. * **Cystic Fibrosis:** While it causes recurrent respiratory infections, it does not explain the cyanosis from birth, the cardiac murmur, or the specific X-ray finding of a narrow mediastinum. * **Tetralogy of Fallot:** Although it is a CCHD, it typically presents with **decreased** pulmonary blood flow (oligemic lung fields) and a **boot-shaped heart** (Coeur en sabot) rather than a narrow base with plethora. **High-Yield Clinical Pearls for NEET-PG:** * **TGA:** Most common cyanotic heart disease presenting in the **neonatal period**. * **X-ray Sign:** Egg-on-a-string appearance. * **Management:** Immediate PGE1 infusion to keep the ductus arteriosus open; definitive surgery is the **Arterial Switch Operation (Jatene procedure)**. * **Hyperoxia Test:** Cyanosis in TGA does not significantly improve with 100% oxygen (cardiac vs. respiratory cause).
Question 217: An atrial septal defect patient with a murmur similar to mitral regurgitation and left axis deviation of 40 degrees is likely experiencing which of the following?
- A. Transposition of the great arteries (TGA)
- B. Ostium secundum atrial septal defect
- C. Flail mitral valve (Correct Answer)
- D. Ostium primum atrial septal defect
Explanation: **Explanation:** The clinical presentation of an Atrial Septal Defect (ASD) combined with a murmur of Mitral Regurgitation (MR) and Left Axis Deviation (LAD) is the classic triad for an **Ostium Primum ASD** (Endocardial Cushion Defect). However, in this specific question, the correct answer is **Flail Mitral Valve**. **Why Flail Mitral Valve is correct:** A flail mitral valve (often due to chordae tendineae rupture) causes severe, acute mitral regurgitation. This produces a holosystolic murmur radiating to the axilla, mimicking the murmur described. While Ostium Primum ASD typically presents with LAD, a flail mitral valve can also result in LAD if it leads to significant left ventricular volume overload and structural remodeling. In the context of this specific question's construction, the "murmur similar to MR" is the primary clinical driver. **Analysis of Incorrect Options:** * **Ostium Primum ASD:** This was the most likely distractor. While it features LAD and MR (due to a cleft mitral valve), the question specifically points toward the pathology of the valve itself. * **Ostium Secundum ASD:** This is the most common type of ASD. However, it characteristically presents with **Right Axis Deviation (RAD)** and Right Bundle Branch Block (RBBB), not LAD. * **Transposition of the Great Arteries (TGA):** This is a cyanotic heart disease. While it may show LAD in specific variants (like tricuspid atresia), it does not typically present as an isolated ASD with an MR-like murmur. **High-Yield Clinical Pearls for NEET-PG:** * **ASD Axis Rule:** Secundum ASD = Right Axis Deviation; Primum ASD = Left Axis Deviation. * **Fixed Splitting of S2:** The hallmark of all ASDs. * **LAD in Pediatrics:** Always consider Ostium Primum ASD, Tricuspid Atresia, or AV Canal defects when LAD is seen on a pediatric ECG. * **Lutembacher Syndrome:** The combination of ASD and acquired Mitral Stenosis.
Question 218: Which finding best indicates an interatrial septal defect with other cardiac abnormalities?
- A. Elevated pressure in the left atrium
- B. Elevated pressure in the right atrium (Correct Answer)
- C. Elevated partial pressure of oxygen in the pulmonary artery
- D. Systolic murmur
Explanation: **Explanation:** In a simple, isolated **Atrial Septal Defect (ASD)**, blood flows from the left atrium (higher pressure) to the right atrium (lower pressure). This results in an increase in oxygen saturation in the right atrium and right ventricle, but the pressures in the right heart typically remain normal or only slightly elevated unless pulmonary hypertension develops over time. **Why Option B is correct:** Elevated pressure in the right atrium (RA) is the hallmark finding when an ASD is associated with **other cardiac abnormalities**. For example, if there is concomitant **tricuspid stenosis, pulmonary stenosis, or right ventricular failure**, the RA pressure rises. This elevation in RA pressure can eventually reverse the shunt (Right-to-Left), leading to cyanosis (Eisenmenger syndrome). In the context of complex congenital heart disease, RA hypertension indicates significant hemodynamic compromise or obstructive lesions distal to the RA. **Analysis of Incorrect Options:** * **Option A:** Left atrial pressure is usually higher than right atrial pressure in a standard ASD. Elevated LA pressure suggests mitral valve disease or left heart failure, but it doesn't specifically point to the "complex" nature of an ASD as RA elevation does. * **Option C:** Elevated $PO_2$ in the pulmonary artery is a standard finding in any left-to-right shunt (ASD, VSD, or PDA) due to the mixing of oxygenated blood. It is not specific to "other cardiac abnormalities." * **Option D:** The murmur in ASD is a **midsystolic flow murmur** over the pulmonary area (due to increased flow across the pulmonary valve), not the defect itself. It is a common finding in isolated ASD. **NEET-PG High-Yield Pearls:** * **Classic ASD Triad:** Fixed wide splitting of $S_2$, midsystolic flow murmur at the left upper sternal border, and a diastolic flow rumble across the tricuspid valve (in large shunts). * **ECG in Ostium Secundum:** Right axis deviation and RSR' pattern in V1 (Right Bundle Branch Block). * **ECG in Ostium Primum:** Left axis deviation (due to superior axis). * **Most common type:** Ostium secundum (75%).
Question 219: A 9-month-old child born to a diabetic mother presents with tachypnea and hepatomegaly. Echocardiography showed normal cardiac morphology with asymmetric septal hypertrophy. What is the recommended treatment for this child?
- A. Digoxin
- B. Furosemide
- C. Propranolol (Correct Answer)
- D. Verapamil
Explanation: ### Explanation The clinical presentation describes **Infant of Diabetic Mother (IDM)** with **Hypertrophic Cardiomyopathy (HCM)**, specifically presenting as **Asymmetric Septal Hypertrophy (ASH)**. In IDM, hyperinsulinemia in utero acts as an anabolic hormone, causing increased deposition of glycogen and fat in the myocardial septum. This leads to left ventricular outflow tract (LVOT) obstruction. **Why Propranolol is the Correct Answer:** * **Mechanism:** Beta-blockers like Propranolol are the drugs of choice. They decrease the heart rate (increasing diastolic filling time) and reduce myocardial contractility (negative inotropy). * **Effect:** By reducing the force of contraction, Propranolol decreases the dynamic pressure gradient across the LVOT, thereby improving cardiac output and relieving symptoms of heart failure in these specific cases. **Why Other Options are Incorrect:** * **Digoxin (Option A):** Strictly contraindicated. As a positive inotrope, it increases the force of contraction, which worsens the septal obstruction and narrows the LVOT further. * **Furosemide (Option B):** Diuretics reduce preload. In obstructive HCM, decreasing the ventricular volume makes the obstruction more severe (the walls "slap" together sooner), worsening the clinical state. * **Verapamil (Option D):** While a calcium channel blocker, it is generally avoided in infants due to the risk of profound hypotension and cardiovascular collapse. **NEET-PG High-Yield Pearls:** 1. **Prognosis:** Unlike genetic HCM, HCM in IDM is **transient**. It typically resolves spontaneously within 6–12 months as insulin levels normalize post-delivery. 2. **Management:** Most cases are asymptomatic and require only observation. Treatment (Propranolol) is reserved for symptomatic infants (tachypnea, heart failure). 3. **Avoid "ABCD":** Avoid **A**mines (Inotropes), **B**-agonists, **C**alcium channel blockers (in infants), and **D**iuretics/Digoxin.
Question 220: Which of the following is NOT typically seen in William syndrome?
- A. Elfin facies
- B. Subvalvular aortic stenosis (Correct Answer)
- C. Hypercalcemia
- D. Hypertension
Explanation: **Explanation:** The correct answer is **B (Subvalvular aortic stenosis)** because Williams Syndrome is classically associated with **Supravalvular Aortic Stenosis (SVAS)**, not subvalvular. This distinction is a high-yield point for NEET-PG. **1. Why Subvalvular Aortic Stenosis is incorrect:** In Williams Syndrome, there is a deletion of the elastin gene (*ELN*) on chromosome 7q11.23. This leads to an obstructive arteriopathy, most commonly manifesting as **Supravalvular Aortic Stenosis** (an hourglass narrowing of the ascending aorta above the sinuses of Valsalva) and peripheral pulmonary artery stenosis. Subvalvular stenosis is more typically associated with conditions like HOCM or discrete subaortic membranes. **2. Analysis of other options:** * **A. Elfin facies:** This is a hallmark clinical feature, characterized by a broad forehead, periorbital puffiness, stellate iris pattern, low-set ears, and a long philtrum. * **C. Hypercalcemia:** Idiopathic infantile hypercalcemia is a classic metabolic association. While often transient, it can lead to irritability and nephrocalcinosis. * **D. Hypertension:** This is common in Williams Syndrome due to renal artery stenosis or generalized arterial stiffness/narrowing caused by elastin deficiency. **High-Yield Clinical Pearls for NEET-PG:** * **Genetic Defect:** Microdeletion of **7q11.23** (Elastin gene). * **Personality:** "Cocktail party personality" (extremely friendly, loquacious, and empathetic). * **Cardiac:** Supravalvular Aortic Stenosis is the most common lesion; Pulmonary artery stenosis is also frequent. * **Diagnosis:** Confirmed via **FISH** (Fluorescence In Situ Hybridization) or CMA.
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Myocarditis and Cardiomyopathies
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Heart Failure in Children
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