Cardiology Practice Questions

Q: A 6-month-old infant with failure to thrive and a loud systolic murmur is likely to have which condition?

Ventricular septal defect. ***Ventricular septal defect*** - A **ventricular septal defect (VSD)** causes a **loud pansystolic murmur** due to blood shunting from the left to the right ventricle, and significant shunting can lead to **heart failure** and **failure to thrive** in infants. - The combination of a loud systolic murmur and failure to thrive in an infant strongly suggests a VSD, as the increased pulmonary blood flow contributes to poor growth. *Hypertrophic cardiomyopathy* - While it can cause a systolic murmur, the murmur in **hypertrophic cardiomyopathy** is typically ejection systolic and heard best at the lower left sternal border, often increasing with Valsalva maneuver, and **failure to thrive** is not its primary presentation unless heart failure develops later. - HCM is primarily a genetic condition leading to abnormal thickening of the myocardium, which is not directly indicated by the given symptoms. *Atrial septal defect* - An **atrial septal defect (ASD)** typically produces a **soft systolic ejection murmur** over the pulmonic area due to increased blood flow across the pulmonic valve, with a **fixed split S2**. - It usually leads to **right ventricular enlargement** and is generally well-tolerated in infancy, rarely causing **failure to thrive** during the first 6 months. - ASDs are usually asymptomatic in infancy and often not detected until later childhood or adulthood unless very large. *Patent ductus arteriosus* - A **patent ductus arteriosus (PDA)** classically presents with a **continuous "machine-like" murmur**, rather than a loud systolic murmur, which is heard best below the left clavicle. - While a large PDA can cause **failure to thrive** and heart failure, the murmur quality ("loud systolic") described does not fit the typical PDA presentation.

Q: A newborn is observed to have a loud, harsh murmur and poor feeding. Which congenital heart defect is most likely?

Ventricular septal defect. ***Ventricular septal defect*** - A **loud, harsh murmur** is characteristic of a VSD, resulting from turbulent blood flow through the defect between the ventricles. - **Poor feeding** in a newborn often indicates **congestive heart failure** due to increased pulmonary blood flow caused by a large VSD. *Atrial septal defect* - ASDs typically produce a **soft ejection systolic murmur** and are often **asymptomatic** in infancy. - Significant symptoms like poor feeding usually appear later in childhood or adulthood, if at all, due to the low-pressure shunt. *Patent ductus arteriosus* - A PDA typically presents with a **continuous "machinery-like" murmur**, distinct from the harsh murmur described. - While it can cause poor feeding and heart failure, the murmur quality is a key differentiator. *Tetralogy of Fallot* - TOF is characterized by **cyanosis** and a **systolic ejection murmur** due to pulmonary stenosis, not typically a loud, harsh murmur from a VSD as the primary finding. - **Hypercyanotic spells** (tet spells) are common, which are not mentioned in this presentation.

Q: What is the most likely diagnosis for a newborn exhibiting cyanosis, tachypnea, and a systolic murmur best heard at the left sternal border?

Tetralogy of Fallot. ***Tetralogy of Fallot*** - This congenital heart defect is characterized by **cyanosis** and a **systolic murmur** at the left sternal border, often due to **pulmonic stenosis** and a **ventricular septal defect**. - **Tachypnea** is a common compensatory mechanism for hypoxia in infants with significant right-to-left shunting. *Ventricular septal defect* - While a VSD can cause a systolic murmur, isolated VSDs typically present with **acyanotic heart disease** unless pulmonary hypertension is severe. - Cyanosis in the neonatal period associated with a VSD usually occurs as part of a more complex malformation like **Tetralogy of Fallot**. *Atrial septal defect* - ASDs are usually **acyanotic** and may not produce a significant murmur in the neonatal period, with sounds often being a **mid-systolic murmur** from increased flow across the pulmonic valve. - **Cyanosis** is not a primary feature of an isolated ASD unless pulmonary hypertension develops much later in life or there is a coexisting right-to-left shunt. *Patent ductus arteriosus* - A PDA typically causes a **continuous "machinery-like" murmur** rather than solely a systolic murmur. - While it can cause **tachypnea** due to pulmonary overcirculation, it does not usually cause **cyanosis** unless there is severe pulmonary hypertension with reversed shunting, which is less common in an otherwise uncomplicated PDA in a newborn.

Q: 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?

Refer for surgical repair. ***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**.

Q: 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?

Coarctation of the aorta. ***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.

Q: 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?

Tetralogy of Fallot. ***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.

Q: 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?

Atrial Septal Defect. ***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.

Q: A 10-year-old with short stature and a webbed neck is likely to have which heart defect?

Coarctation of Aorta. ***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.

Q: A 4-year-old presents with 'blue spells' and a boot-shaped heart on chest X-ray. Which congenital heart defect does this indicate?

Tetralogy of Fallot. ***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 1

A 6-month-old infant with failure to thrive and a loud systolic murmur is likely to have which condition?

Accepted Answer

Ventricular septal defect

Answer

Hypertrophic cardiomyopathy

Answer

Atrial septal defect

Answer

Patent ductus arteriosus

Question 2

A newborn is observed to have a loud, harsh murmur and poor feeding. Which congenital heart defect is most likely?

Accepted Answer

Ventricular septal defect

Answer

Atrial septal defect

Answer

Patent ductus arteriosus

Answer

Tetralogy of Fallot

Question 3

What is the most likely diagnosis for a newborn exhibiting cyanosis, tachypnea, and a systolic murmur best heard at the left sternal border?

Accepted Answer

Tetralogy of Fallot

Answer

Ventricular septal defect

Answer

Atrial septal defect

Answer

Patent ductus arteriosus

Question 4

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?

Accepted Answer

Refer for surgical repair

Answer

Start diuretic therapy

Answer

Administer oxygen therapy

Answer

Initiate beta-blocker therapy

Question 5

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?

Accepted Answer

Coarctation of the aorta

Answer

Tricuspid atresia

Answer

Tetralogy of Fallot

Answer

Transposition of the great arteries

Question 6

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?

Accepted Answer

Tetralogy of Fallot

Answer

Ventricular Septal Defect

Answer

Atrial Septal Defect

Answer

Patent Ductus Arteriosus

Question 7

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?

Accepted Answer

Atrial Septal Defect

Answer

Ventricular Septal Defect

Answer

Pulmonary Stenosis

Answer

Hypertrophic Cardiomyopathy

Question 8

A 10-year-old with short stature and a webbed neck is likely to have which heart defect?

Accepted Answer

Coarctation of Aorta

Answer

VSD

Answer

ASD

Answer

Pulmonary Stenosis

Question 9

A 4-year-old presents with 'blue spells' and a boot-shaped heart on chest X-ray. Which congenital heart defect does this indicate?

Accepted Answer

Tetralogy of Fallot

Answer

Ventricular septal defect

Answer

Aortic stenosis

Answer

Patent ductus arteriosus

Question 10

Which imaging modality is essential for diagnosing Tetralogy of Fallot and planning surgical intervention in infants?

Accepted Answer

Echocardiography

Answer

Chest X-ray

Answer

CT scan

Answer

MRI

Cardiology — MCQs

Cardiology — MCQs

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