Cardiology — MCQs
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A 10-year-old boy presents with fatigue, palpitations, and chest pain during physical activity. His past medical history includes recurrent respiratory infections and failure to thrive. On examination, he has a grade 3/6 systolic murmur at the left lower sternal border and hepatomegaly. An ECG shows right ventricular hypertrophy, and an echocardiogram reveals a large ventricular septal defect (VSD) with pulmonary hypertension. What is the most appropriate next step in management?
A newborn presents with a critical congenital heart condition where the patent ductus arteriosus is essential for maintaining adequate systemic perfusion to the lower body. What is the most likely diagnosis?
A 9-year-old boy presents with shortness of breath and syncope during exercise. Examination reveals a systolic ejection murmur and wide, fixed splitting of the second heart sound. What is the most likely diagnosis?
A 5-year-old boy presents with difficulty in breathing and fatigue. On examination, a systolic murmur is heard at the left sternal border, and the chest X-ray shows a boot-shaped heart. What is the most likely diagnosis?
A 10-year-old with short stature and a webbed neck is likely to have which heart defect?
Which heart defect is associated with Turner syndrome?
A 4-year-old presents with 'blue spells' and a boot-shaped heart on chest X-ray. Which congenital heart defect does this indicate?
Which of the following conditions is least likely to present with pulmonary plethora?
Which of the following congenital anomalies leads to heart failure at birth?
Most common conotruncal anomaly
Cardiology Indian Medical PG Practice Questions and MCQs
Question 411: A 10-year-old boy presents with fatigue, palpitations, and chest pain during physical activity. His past medical history includes recurrent respiratory infections and failure to thrive. On examination, he has a grade 3/6 systolic murmur at the left lower sternal border and hepatomegaly. An ECG shows right ventricular hypertrophy, and an echocardiogram reveals a large ventricular septal defect (VSD) with pulmonary hypertension. What is the most appropriate next step in management?
- A. Start diuretic therapy
- B. Administer oxygen therapy
- C. Refer for surgical repair (Correct Answer)
- D. Initiate beta-blocker therapy
Explanation: ***Refer for surgical repair*** - The patient's presentation with fatigue, palpitations, chest pain, and **pulmonary hypertension** in the setting of a large VSD indicates significant cardiac compromise requiring definitive intervention. - While supportive measures are helpful, they are not curative for a large VSD with associated pulmonary hypertension, which can lead to irreversible **Eisenmenger syndrome** if not corrected. *Start diuretic therapy* - Diuretics can help manage **heart failure symptoms** like hepatomegaly and fatigue by reducing fluid overload. - However, they do not address the underlying **structural defect (VSD)** or the progression of pulmonary hypertension. *Administer oxygen therapy* - Oxygen therapy can alleviate symptoms of **hypoxia** and reduce pulmonary vascular resistance in some cases. - It is a supportive measure but does not resolve the anatomical defect or halt the progression of **pulmonary hypertension** caused by the VSD. *Initiate beta-blocker therapy* - Beta-blockers are primarily used to manage conditions like **hypertrophic cardiomyopathy** or to control heart rate. - They are not a primary treatment for a large VSD with pulmonary hypertension and might even worsen symptoms in cases of **right heart failure**.
Question 412: A newborn presents with a critical congenital heart condition where the patent ductus arteriosus is essential for maintaining adequate systemic perfusion to the lower body. What is the most likely diagnosis?
- A. Tricuspid atresia
- B. Tetralogy of Fallot
- C. Coarctation of the aorta (Correct Answer)
- D. Transposition of the great arteries
Explanation: ***Coarctation of the aorta*** - In critical **coarctation of the aorta**, the **patent ductus arteriosus (PDA)** is vital for blood flow to the systemic circulation distal to the coarctation, ensuring adequate perfusion to the **lower body**. - Closure of the PDA in severe coarctation can lead to circulatory collapse, as the constricted aorta cannot adequately supply blood to the lower extremities and organs. - This is a classic example of **ductal-dependent systemic circulation**. *Tricuspid atresia* - **Tricuspid atresia** typically relies on an **atrial septal defect** and a **patent ductus arteriosus** for pulmonary blood flow, not systemic perfusion to the lower body. - Systemic perfusion is generally maintained to all parts of the body, but pulmonary circulation is compromised. - This represents ductal-dependent **pulmonary** circulation. *Tetralogy of Fallot* - In **Tetralogy of Fallot**, the PDA contributes to pulmonary blood flow, especially in cases with severe **pulmonary stenosis** or atresia. - The primary issue is reduced pulmonary blood flow, and systemic perfusion to the lower body is not usually dependent on the PDA. *Transposition of the great arteries* - In **Transposition of the great arteries (TGA)**, the PDA allows for mixing of systemic and pulmonary circulations, which is essential for survival. - However, its main role is to facilitate mixing between the parallel circulations, not specifically to maintain systemic perfusion to the lower body due to an obstruction.
Question 413: A 9-year-old boy presents with shortness of breath and syncope during exercise. Examination reveals a systolic ejection murmur and wide, fixed splitting of the second heart sound. What is the most likely diagnosis?
- A. Ventricular Septal Defect
- B. Atrial Septal Defect (Correct Answer)
- C. Pulmonary Stenosis
- D. Hypertrophic Cardiomyopathy
Explanation: ***Atrial Septal Defect*** - The combination of a **systolic ejection murmur** and **wide, fixed splitting of the second heart sound** is a classic auscultatory finding in atrial septal defect (ASD). - **Shortness of breath** and **syncope during exercise** are symptoms that can arise from significant left-to-right shunting, leading to pulmonary overload and reduced cardiac output on exertion. *Ventricular Septal Defect* - A **ventricular septal defect (VSD)** typically presents with a **holosystolic murmur** best heard at the lower left sternal border, not a systolic ejection murmur. - While VSDs can cause symptoms similar to ASDs, the character of the murmur and the specific finding of a **wide, fixed S2 split** point away from VSD. *Pulmonary Stenosis* - **Pulmonary stenosis** would cause a systolic ejection murmur, but it would typically be associated with a **prominent ejection click** and a **narrowed or single S2**, not a wide, fixed split. - The symptoms of shortness of breath and syncope would be due to reduced pulmonary blood flow, which is not consistent with the fixed S2 splitting. *Hypertrophic Cardiomyopathy* - **Hypertrophic cardiomyopathy (HCM)** often presents with a **crescendo-decrescendo systolic murmur** that intensifies with a Valsalva maneuver, and it lacks the characteristic wide, fixed S2 split. - Syncope and dyspnea on exertion are common in HCM due to outflow tract obstruction and diastolic dysfunction, but the specific auscultatory findings are critical differentiators.
Question 414: A 5-year-old boy presents with difficulty in breathing and fatigue. On examination, a systolic murmur is heard at the left sternal border, and the chest X-ray shows a boot-shaped heart. What is the most likely diagnosis?
- A. Tetralogy of Fallot (Correct Answer)
- B. Ventricular Septal Defect
- C. Atrial Septal Defect
- D. Patent Ductus Arteriosus
Explanation: ***Tetralogy of Fallot*** - The combination of **difficulty in breathing**, **fatigue**, a **systolic murmur at the left sternal border**, and a **boot-shaped heart on chest X-ray** is highly characteristic of Tetralogy of Fallot. - The "boot-shaped heart" (or *coeur en sabot*) on X-ray is due to **right ventricular hypertrophy** and an upturned cardiac apex, a hallmark of this condition. *Ventricular Septal Defect* - While a **VSD** can cause a **systolic murmur** and difficulty breathing, it typically does not present with a **boot-shaped heart** on chest X-ray. - The murmur is usually **holosystolic** and loudest at the lower left sternal border, but the specific X-ray finding points away from an isolated VSD. *Atrial Septal Defect* - An **ASD** usually presents with a **fixed split second heart sound** and a **systolic ejection murmur** at the upper left sternal border due to increased flow across the pulmonary valve, not necessarily a prominent systolic murmur at the left sternal border. - It does not cause a **boot-shaped heart** on chest X-ray. *Patent Ductus Arteriosus* - A **PDA** typically presents with a **continuous "machinery" murmur** loudest below the left clavicle and bounding peripheral pulses. - While it can cause heart failure symptoms, it does not lead to a **boot-shaped heart** on chest X-ray.
Question 415: A 10-year-old with short stature and a webbed neck is likely to have which heart defect?
- A. Coarctation of Aorta (Correct Answer)
- B. VSD
- C. ASD
- D. Pulmonary Stenosis
Explanation: ***Coarctation of Aorta*** - **Coarctation of the aorta** is a common cardiovascular anomaly associated with Turner syndrome, which presents with **short stature** and a **webbed neck**. - Other classic features of Turner syndrome include **gonadal dysgenesis**, **lymphedema**, and **bicuspid aortic valve** (the most common cardiac defect in Turner syndrome, often co-existing with coarctation). - Turner syndrome occurs in females with 45,X karyotype. *VSD* - **Ventricular septal defects (VSDs)** are the most common congenital heart defects overall but are not specifically associated with the constellation of findings seen in Turner syndrome. - VSDs typically present with a **holosystolic murmur** and signs of heart failure or pulmonary hypertension depending on the size. *ASD* - **Atrial septal defects (ASDs)** can occur in various genetic syndromes, but they are not as strongly linked to the specific phenotypic features of **short stature** and **webbed neck** as coarctation is with Turner syndrome. - ASDs are often characterized by a **fixed, wide splitting of S2** and a pulmonary flow murmur. *Pulmonary Stenosis* - **Pulmonary stenosis** is the most common cardiac defect in Noonan syndrome, which also presents with **short stature** and **webbed neck**, similar to Turner syndrome. - However, Noonan syndrome occurs in **both males and females** with a **normal karyotype**, whereas Turner syndrome is **female-only with 45,X karyotype**. - The clinical context of a 10-year-old (sex not specified, but Turner syndrome phenotype described) makes coarctation more characteristic of Turner syndrome. - Pulmonary stenosis manifests with a **systolic ejection murmur** best heard at the upper left sternal border.
Question 416: Which heart defect is associated with Turner syndrome?
- A. Patent ductus arteriosus
- B. Coarctation of the aorta (Correct Answer)
- C. Atrial septal defect
- D. Ventricular septal defect
Explanation: ***Coarctation of the aorta*** - **Coarctation of the aorta** is the most common cardiac anomaly seen in patients with **Turner syndrome**, occurring in 10-20% of cases. - This congenital narrowing of the aorta leads to **hypertension in the upper extremities** and **decreased pulses in the lower extremities**. *Patent ductus arteriosus* - While a **patent ductus arteriosus (PDA)** can occur in Turner syndrome, it is less common than coarctation of the aorta. - A PDA involves the failure of the **ductus arteriosus** to close after birth, leading to a shunt between the aorta and pulmonary artery. *Atrial septal defect* - **Atrial septal defects (ASDs)** are not as strongly associated with Turner syndrome as coarctation of the aorta. - ASDs involve a hole in the **atrial septum**, allowing blood to flow between the atria. *Ventricular septal defect* - **Ventricular septal defects (VSDs)** are among the most common congenital heart defects overall but are less specifically linked to Turner syndrome compared to coarctation. - VSDs are characterized by a hole in the **ventricular septum**, causing a shunt between the ventricles.
Question 417: A 4-year-old presents with 'blue spells' and a boot-shaped heart on chest X-ray. Which congenital heart defect does this indicate?
- A. Tetralogy of Fallot (Correct Answer)
- B. Ventricular septal defect
- C. Aortic stenosis
- D. Patent ductus arteriosus
Explanation: ***Tetralogy of Fallot*** - The combination of **'blue spells' (cyanotic spells)** and a **boot-shaped heart (coeur en sabot)** on chest X-ray are classic signs of Tetralogy of Fallot [2]. - This condition involves four key defects: **ventricular septal defect**, **pulmonary stenosis**, **overriding aorta**, and **right ventricular hypertrophy** [1]. *Ventricular septal defect* - While a component of Tetralogy of Fallot, an isolated **VSD** primarily causes a left-to-right shunt and typically does not lead to severe cyanosis or a boot-shaped heart. - Symptoms usually include a loud **holosystolic murmur** and signs of heart failure rather than 'blue spells'. *Aortic stenosis* - This defect involves a **narrowing of the aortic valve**, obstructing blood flow from the left ventricle. - It usually presents with symptoms like **chest pain**, **syncope**, or **shortness of breath** on exertion, and does not cause cyanosis or a boot-shaped heart. *Patent ductus arteriosus* - A **PDA** is an open connection between the aorta and pulmonary artery, leading to a left-to-right shunt after birth. - It typically causes a **continuous murmur** and can lead to pulmonary hypertension or heart failure, but not cyanotic spells or a boot-shaped heart.
Question 418: Which of the following conditions is least likely to present with pulmonary plethora?
- A. Ebstein anomaly (Correct Answer)
- B. Hypoplastic left heart syndrome
- C. Double outlet right ventricle
- D. TGA (Transposition of Great Arteries)
Explanation: ***Ebstein anomaly*** - Ebstein anomaly is characterized by **apical displacement of the tricuspid valve leaflets**, leading to a large atrialized right ventricle and severe tricuspid regurgitation. - This typically results in **right-to-left shunting** through a patent foramen ovale or atrial septal defect, causing **cyanosis and reduced pulmonary blood flow** (pulmonary oligemia), rather than plethora. *Hypoplastic left heart syndrome* - Hypoplastic left heart syndrome (HLHS) involves **underdevelopment of the left side of the heart**, including the left ventricle, mitral valve, aortic valve, and aorta. - In HLHS, pulmonary venous return shunts from the left atrium to the right atrium via a patent foramen ovale, and systemic blood flow is maintained by a patent ductus arteriosus, resulting in **increased pulmonary blood flow (pulmonary plethora)**. *Double outlet right ventricle* - In double outlet right ventricle (DORV), both the **aorta and pulmonary artery arise primarily from the right ventricle**. - The degree of pulmonary plethora depends on the presence and size of a **ventricular septal defect (VSD)** and the relationship of the great arteries to the VSD. Most commonly, it leads to **increased pulmonary blood flow** if the VSD allows for systemic-to-pulmonary shunting. *TGA (Transposition of Great Arteries)* - Transposition of the Great Arteries (TGA) involves the **aorta arising from the right ventricle** and the **pulmonary artery arising from the left ventricle**, creating two parallel circulations. - In d-TGA, if there is a **large VSD** or **patent ductus arteriosus**, there will be mixing of oxygenated blood with deoxygenated blood, often resulting in **increased pulmonary blood flow (pulmonary plethora)** to the systemic circulation.
Question 419: Which of the following congenital anomalies leads to heart failure at birth?
- A. Total anomalous pulmonary venous connection (Correct Answer)
- B. Transposition of great arteries
- C. Pulmonary atresia
- D. Coarctation of aorta
Explanation: ***Total anomalous pulmonary venous connection*** - **Obstructed TAPVC** is the classic congenital heart defect causing heart failure **at birth or within hours of life** - In obstructed types (especially **infracardiac** and some **supracardiac with obstruction**), pulmonary venous blood cannot adequately return to the heart, causing severe **pulmonary venous congestion** and **right heart failure** - Presents with **severe cyanosis, respiratory distress, and heart failure immediately at birth** - This is a **neonatal emergency** requiring immediate surgical intervention *Coarctation of aorta* - Typically presents with heart failure at **1-2 weeks of age** when the ductus arteriosus closes - At birth, the patent ductus arteriosus allows blood to bypass the coarctation, so symptoms are minimal - As the PDA closes, **left ventricular afterload increases dramatically**, leading to heart failure - **Critical coarctation** can rarely present earlier, but classically this is NOT "at birth" *Transposition of great arteries* - Presents primarily with **severe cyanosis at birth**, not heart failure - The aorta arises from the right ventricle and pulmonary artery from the left ventricle - Survival depends on mixing through PDA, ASD, or VSD - Heart failure develops later if there is excessive pulmonary blood flow through large shunts *Pulmonary atresia* - Complete obstruction of the pulmonary valve preventing right ventricular outflow - Presents with **severe cyanosis at birth** due to lack of pulmonary blood flow - The primary manifestation is **hypoxemia and cyanosis**, not heart failure - Requires patent ductus arteriosus or collateral circulation for survival
Question 420: Most common conotruncal anomaly
- A. TGA
- B. Tetralogy of Fallot (Correct Answer)
- C. Truncus arteriosus
- D. Double outlet right ventricle
Explanation: ***Tetralogy of Fallot*** - Tetralogy of Fallot is the **most common conotruncal anomaly** and the **most common cyanotic congenital heart defect**, accounting for approximately 5-7% of all congenital heart diseases. - Its four classic features (ventricular septal defect, pulmonary stenosis, overriding aorta, and right ventricular hypertrophy) all result from an **anterior and cephalad displacement of the conotruncal septum**. - Among the classic conotruncal anomalies (TOF, TGA, Truncus arteriosus, DORV), TOF has the highest prevalence. *TGA* - **Transposition of the Great Arteries (TGA)** is another significant conotruncal anomaly, but it is less common than Tetralogy of Fallot. - It involves an **abnormal septation** and rotation of the great arteries, leading to two parallel circulations. *Truncus arteriosus* - **Truncus arteriosus** is a rare and severe conotruncal anomaly where a single great artery arises from both ventricles, instead of separate aorta and pulmonary arteries. - This condition involves a failure of the **truncal ridges to fuse** and form a septum. *Double outlet right ventricle* - **Double outlet right ventricle (DORV)** is a complex anomaly where both great arteries (aorta and pulmonary artery) arise entirely or predominantly from the right ventricle. - This condition is less common than Tetralogy of Fallot and has a **wide spectrum of anatomical variations**.
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