Congenital Heart Disease Imaging — MCQs

10 questions

Eisenmenger complex is common in adult in –

Which of the following is the most reliable imaging technique for detecting cyanotic congenital heart diseases in newborns?

Which of these acyanotic congenital heart diseases is associated with volume overload?

Which of the following congenital heart diseases is MOST OFTEN associated with decreased pulmonary blood flow?

Snowman appearance on x-ray is seen in which cardiac pathology -

Congenital cyanotic heart disease with pulmonary oligemia is seen with –

Which of the following cyanotic heart diseases cause increased pulmonary blood flow? 1. Ebstein anomaly 2. Tetralogy of Fallot 3. Transposition of the great arteries (TGA) 4. Total anomalous pulmonary venous communication (TAPVC) Select the correct combination:

Snowman sign is seen in:

Characteristic radiographic appearance of aortitis is:

Q10

Which finding on echocardiography suggests 'constrictive pericarditis'?

Congenital Heart Disease Imaging Indian Medical PG Practice Questions and MCQs

Question 1: Eisenmenger complex is common in adult in –

A. Cushion defect
B. ASD
C. PDA
D. VSD (Correct Answer)

Explanation: ***VSD*** - A large, uncorrected **ventricular septal defect (VSD)** is the most common congenital heart defect to progress to **Eisenmenger syndrome** in adults. [1] - The bidirectional or right-to-left shunting through the VSD eventually leads to **pulmonary hypertension** and and systemic cyanosis. [1] *Cushion defect* - While **atrioventricular septal defects (AVSDs)**, or cushion defects, can lead to pulmonary hypertension, they are less common causes of Eisenmenger syndrome than VSDs in adults. [1] - They involve defects in both atrial and ventricular septa, often seen in individuals with **Down syndrome**. [1] *ASD* - **Atrial septal defects (ASDs)** typically involve left-to-right shunting, and while they can cause pulmonary hypertension over many decades, they rarely progress to full Eisenmenger syndrome due to the lower pressure differential between the atria. [1] - The elevated pulmonary pressures with ASD tend to be less severe and slower in onset compared to VSDs or PDAs. [1] *PDA* - A **patent ductus arteriosus (PDA)** can lead to Eisenmenger syndrome, but it is less common in adults than VSDs because PDAs are often recognized and closed earlier in life. [1] - An uncorrected large PDA results in chronic left-to-right shunting, leading to increased pulmonary blood flow and subsequent **pulmonary vascular disease**. [1]

Question 2: Which of the following is the most reliable imaging technique for detecting cyanotic congenital heart diseases in newborns?

A. CT angiography
B. Echocardiography (Correct Answer)
C. MRI
D. Chest X-ray

Explanation: ***Correct Answer: Echocardiography*** - **Echocardiography** is the gold standard for diagnosing congenital heart diseases in newborns due to its non-invasive nature, real-time imaging capabilities, and ability to assess blood flow dynamics - Provides detailed anatomical and functional information about the heart, great vessels, and associated anomalies without radiation exposure - Can be performed at bedside and allows Doppler assessment of intracardiac shunts and flow patterns - **First-line investigation** for suspected cyanotic heart disease in the neonatal period *Incorrect: CT angiography* - Involves **radiation exposure**, which is a significant concern in newborns - While it offers excellent anatomical detail, it is typically reserved for complex cases where echocardiography is inconclusive or for surgical planning - Not used as a primary diagnostic tool in neonates *Incorrect: MRI* - Provides comprehensive anatomical and functional data without radiation, but often requires **sedation** in newborns due to long scan times and need for stillness - Limited availability compared to echocardiography makes it less practical as a first-line diagnostic method - Reserved for cases requiring detailed vascular anatomy or when echocardiographic windows are poor *Incorrect: Chest X-ray* - Can show general cardiac size and pulmonary vascularity patterns (increased or decreased), which may suggest congenital heart disease - Provides **limited anatomical detail** and cannot definitively diagnose specific cardiac defects - Useful as an initial screening tool but lacks the detailed functional and structural information needed for definitive diagnosis

Question 3: Which of these acyanotic congenital heart diseases is associated with volume overload?

A. Aortic stenosis
B. None of the options
C. Ventricular septal defect (Correct Answer)
D. Coarctation of aorta

Explanation: ***Ventricular septal defect*** - A **ventricular septal defect (VSD)** causes a left-to-right shunt, leading to increased blood flow to the **pulmonary circulation** and the left side of the heart [1]. - This increased blood flow results in a **volume overload state** for the left atrium and left ventricle [1]. *Aortic stenosis* - **Aortic stenosis (AS)** is characterized by an obstruction to outflow from the left ventricle, leading to **pressure overload** on the left ventricle, not volume overload. - While prolonged AS can cause left ventricular hypertrophy, it doesn't primarily cause the type of volume overload seen with shunts. *None of the options* - This option is incorrect because **ventricular septal defect** is a specific acyanotic congenital heart disease that causes significant volume overload [1]. - **VSDs** are a classic example of conditions leading to increased pulmonary blood flow and chamber dilation due to shunting [1]. *Coarctation of aorta* - **Coarctation of the aorta** is a narrowing of the aorta, primarily causing **pressure overload** in the left ventricle due to increased resistance to systemic blood flow. - It does not cause a shunt or increased pulmonary blood flow, thus not leading to volume overload in the same way as VSD.

Question 4: Which of the following congenital heart diseases is MOST OFTEN associated with decreased pulmonary blood flow?

A. TAPVC
B. Truncus arteriosus
C. Ebstein's anomaly
D. Single ventricle with pulmonary stenosis (Correct Answer)

Explanation: ***Single ventricle with pulmonary stenosis*** - The combination of a **single ventricle (functional or anatomic)** and **pulmonary stenosis** **MOST CONSISTENTLY** causes severely decreased pulmonary blood flow. - This anatomical arrangement creates an **obligatory shunt** (usually a VSD or PDA) to allow for some mixing of systemic and pulmonary venous return, but the stenotic pulmonary outflow tract significantly limits the total volume reaching the lungs. - This is a **classic cyanotic lesion with consistently decreased pulmonary blood flow**. *TAPVC* - **Total anomalous pulmonary venous connection (TAPVC)** is associated with **increased pulmonary blood flow** because all pulmonary venous return eventually shunts from the systemic circulation back to the pulmonary circulation, causing recirculation. - This condition leads to right heart dilation and pulmonary hypertension due to the excessive volume load on the pulmonary circuit. *Truncus arteriosus* - **Truncus arteriosus** is characterized by a single great artery overriding a large ventricular septal defect, leading to a **left-to-right shunt** and **increased pulmonary blood flow** and pressure. - Both systemic and pulmonary circulations receive blood from the single truncal artery, but pulmonary vascular resistance is usually lower, causing significant shunt to the lungs. *Ebstein's anomaly* - **Ebstein's anomaly** involves **tricuspid valve displacement** into the right ventricle causing functional RV hypoplasia and tricuspid regurgitation. - While it **CAN cause decreased pulmonary blood flow** when severe (with right-to-left shunt across an ASD), the severity is **highly variable** - mild cases may have normal or only slightly reduced pulmonary blood flow. - Unlike single ventricle with pulmonary stenosis, Ebstein's anomaly does **NOT consistently** present with severely decreased pulmonary blood flow.

Question 5: Snowman appearance on x-ray is seen in which cardiac pathology -

A. TAPVC (Correct Answer)
B. TGA
C. Ebstein's anomaly
D. Fallot's tetralogy

Explanation: ***TAPVC*** - The **snowman sign**, or **figure-of-8 heart**, on a chest X-ray is characteristic of supracardiac **Total Anomalous Pulmonary Venous Connection (TAPVC)**, where pulmonary veins drain into the superior vena cava via a vertical vein and an innominate vein, causing the dilated superior vena cava and innominate vein to form the "head" of the snowman and the cardiac silhouette the "body". - This appearance is due to the **dilated superior vena cava** and the **vertical vein**, which return all pulmonary venous blood to the systemic circulation, leading to right heart enlargement and increased pulmonary vascularity. *TGA* - **Transposition of the Great Arteries (TGA)** typically presents with an **egg-on-a-string** appearance on chest X-ray, characterized by a narrow vascular pedicle and an enlarged cardiac silhouette. - This is due to the transposed great arteries, where the aorta arises from the right ventricle and the pulmonary artery from the left ventricle. *Ebstein's anomaly* - **Ebstein's anomaly** usually shows a **massive cardiomegaly**, often described as a **box-shaped heart**, due to severe right atrial and right ventricular enlargement. - The characteristic finding is the apical displacement of the tricuspid valve leaflets into the right ventricle. *Fallots tetralogy* - **Tetralogy of Fallot** classic X-ray finding is a **boot-shaped heart** (coeur en sabot), caused by right ventricular hypertrophy and a concave pulmonary artery segment. - Pulmonary oligaemia is also common due to the right ventricular outflow tract obstruction.

Question 6: Congenital cyanotic heart disease with pulmonary oligemia is seen with –

A. VSD
B. Hypoplastic left ventricle
C. ASD
D. Tricuspid atresia (Correct Answer)

Explanation: ***Tricuspid atresia*** - **Tricuspid atresia** is a **cyanotic congenital heart disease** where the tricuspid valve is absent, preventing blood flow from the right atrium to the right ventricle, leading to **pulmonary hypoperfusion** or **oligemia**. - Systemic venous return must shunt across an **atrial septal defect (ASD)** or **patent foramen ovale (PFO)** to the left atrium, mixing with oxygenated blood, resulting in cyanosis. - Chest X-ray characteristically shows **decreased pulmonary vascular markings** (oligemia). *VSD* - A **Ventricular Septal Defect (VSD)** typically causes a **left-to-right shunt**, leading to **pulmonary plethora (increased pulmonary blood flow)**, not oligemia. - While large VSDs can eventually lead to Eisenmenger syndrome with cyanosis, the initial presentation is usually characterized by increased pulmonary flow. *Hypoplastic left ventricle* - **Hypoplastic left heart syndrome (HLHS)** is a **cyanotic** condition, but it results in **pulmonary plethora (increased pulmonary blood flow)**, not oligemia. - All systemic venous return flows to the right ventricle, which pumps to both the pulmonary arteries (normal pathway) and to the systemic circulation via a **patent ductus arteriosus (PDA)**, resulting in normal or increased pulmonary blood flow. - The primary issue is a severely underdeveloped left side of the heart, which does not lead to pulmonary oligemia. *ASD* - An **Atrial Septal Defect (ASD)** usually causes a **left-to-right shunt**, leading to **pulmonary plethora (increased pulmonary blood flow)** and is typically an **acyanotic** heart condition. - Cyanosis only develops late if pulmonary hypertension leads to shunt reversal (Eisenmenger syndrome), which is not the primary presentation.

Question 7: Which of the following cyanotic heart diseases cause increased pulmonary blood flow? 1. Ebstein anomaly 2. Tetralogy of Fallot 3. Transposition of the great arteries (TGA) 4. Total anomalous pulmonary venous communication (TAPVC) Select the correct combination:

A. 3,4 (Correct Answer)
B. 1,2
C. 2,4
D. 1,4

Explanation: ***3,4 (TGA and TAPVC)*** - **Transposition of the great arteries (TGA)** involves two parallel circulations with the aorta arising from the right ventricle and pulmonary artery from the left ventricle. Mixing occurs through defects (ASD, VSD, or PDA), leading to **pulmonary overcirculation** as oxygenated blood recirculates through the lungs. - **Total anomalous pulmonary venous connection (TAPVC)** results in all pulmonary veins draining into the systemic venous circulation (typically right atrium). This causes **increased volume load on the right heart** and subsequently increased pulmonary blood flow, with obligatory mixing at the atrial level. *1,2 (Ebstein and ToF)* - Both conditions cause **decreased pulmonary blood flow**. - **Ebstein anomaly** involves apical displacement of the tricuspid valve with "atrialization" of the right ventricle, causing tricuspid regurgitation and right-to-left shunting through an ASD/PFO. - **Tetralogy of Fallot** features right ventricular outflow tract obstruction (pulmonary stenosis) as its defining feature, causing reduced pulmonary blood flow. *2,4* - Incorrect combination: **Tetralogy of Fallot causes decreased pulmonary blood flow** due to RVOT obstruction, not increased. *1,4* - Incorrect combination: **Ebstein anomaly causes decreased pulmonary blood flow**, not increased.

Question 8: Snowman sign is seen in:

A. VSD
B. ASD
C. TGA
D. TAPVC (Correct Answer)

Explanation: ***TAPVC*** - The **snowman sign**, or "figure-of-8" or "cottage loaf" heart, is characteristic of **supracardiac total anomalous pulmonary venous connection (TAPVC)**. - It results from the **dilatation of the superior vena cava** and the abnormally draining pulmonary veins entering the innominate vein, forming the "head" of the snowman, combined with the normal cardiac silhouette forming the "body." *VSD* - **Ventricular septal defects (VSDs)** primarily cause left-to-right shunting and may lead to **cardiomegaly** and **pulmonary vascular congestion** but do not typically present with a snowman sign. - The characteristic echocardiographic finding for a VSD is a **defect in the interventricular septum** with turbulent flow. *ASD* - **Atrial septal defects (ASDs)** involve a shunt between the atria and typically manifest with **right ventricular enlargement** and **dilated pulmonary arteries**, but not the characteristic appearance of a snowman. - The chest X-ray in ASD may show **increased pulmonary vascular markings** and cardiomegaly, but not the specific suprasternal widening seen in TAPVC. *TGA* - **Transposition of the great arteries (TGA)** often presents with a **"egg-on-a-string" appearance** on chest X-ray due to a narrow vascular pedicle and cardiomegaly. - This is primarily due to the **aorta arising from the right ventricle** and the **pulmonary artery from the left ventricle**, leading to separate circulations and distinct radiographic findings from TAPVC.

Question 9: Characteristic radiographic appearance of aortitis is:

A. Calcification of ascending aorta
B. Dilation of arch of aorta (Correct Answer)
C. Calcification of descending aorta
D. Enlargement of left atrium

Explanation: ***Dilation of arch of aorta*** - Aortitis, particularly in the context of **Takayasu arteritis** or **syphilitic aortitis**, frequently causes inflammation and weakening of the aortic wall, leading to **aneurysmal dilation**, most commonly in the aortic arch. - This dilation is often visible on imaging as an enlarged, expanded segment of the aorta. *Calcification of ascending aorta* - While calcification can occur in the aorta, **ascending aortic calcification** is more commonly associated with **atherosclerosis** and degenerative changes rather than active vessel inflammation characteristic of aortitis. - Aortitis primarily involves inflammation and remodeling of the vessel wall. *Calcification of descending aorta* - **Descending aortic calcification** is also predominantly a hallmark of **atherosclerotic disease**, which involves plaque formation and hardening of the arteries. - It does not specifically indicate active inflammation of the aortic wall as seen in aortitis. *Enlargement of left atrium* - **Left atrial enlargement** is typically a consequence of **mitral valve disease**, **left ventricular dysfunction**, or **hypertension**, which lead to increased pressure or volume overload in the left atrium. - It is not a direct or characteristic radiographic finding associated with aortitis.

Question 10: Which finding on echocardiography suggests 'constrictive pericarditis'?

A. Pericardial thickening and septal bounce (Correct Answer)
B. Increased wall thickness
C. Global hypokinesis
D. Pericardial effusion

Explanation: ***Pericardial thickening and septal bounce*** - **Pericardial thickening** is a direct anatomical feature of constrictive pericarditis, indicating the fibrotic and inflamed state of the pericardium. - **Septal bounce**, or interventricular septal motion variation with respiration, is a highly specific sign of constriction, due to exaggerated ventricular interdependence. *Increased wall thickness* - This finding is more characteristic of **hypertrophic cardiomyopathy** or **hypertensive heart disease**, where the myocardial muscle itself thickens. - While it can impair diastolic function, it doesn't indicate a primary pericardial issue. *Global hypokinesis* - **Global hypokinesis** refers to reduced overall contractility of the heart muscle, typically seen in conditions like **dilated cardiomyopathy** or significant **ischemic heart disease**. - This indicates systolic dysfunction, whereas constrictive pericarditis primarily affects diastolic filling. *Pericardial effusion* - A **pericardial effusion** is an accumulation of fluid around the heart, which can cause **cardiac tamponade** if severe. - While effusions can sometimes precede or coexist with constrictive pericarditis, the fluid itself is not the hallmark of constriction, which is defined by a thickened, rigid pericardium.

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