Congenital Heart Diseases: Cyanotic — MCQs

10 questions

Which of the following is a PRIMARY component of Tetralogy of Fallot?

A 45-year-old woman presents with clubbing and cyanosis. Chest X-ray shows a prominent pulmonary artery. Which congenital heart disease should be considered?

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:

Tetralogy of Fallot is characterized by following except –

Pulmonary plethora in a child presenting with cyanosis, is seen in?

Congenital cyanotic heart disease with pulmonary oligemia is seen with –

Commonest type of congenital cyanotic heart disease is -

A 6-year-old with congenital heart disease presents with fever, new-onset murmur, and petechiae. Blood cultures are pending, but initial Gram stain shows Gram-positive cocci. What is the most appropriate initial intervention?

Which among the following is a sure sign of heart failure in an infant with congenital heart disease?

Q10

Which of the following cyanotic congenital heart disease is associated with increased risk of chest infections?

Congenital Heart Diseases: Cyanotic Indian Medical PG Practice Questions and MCQs

Question 1: Which of the following is a PRIMARY component of Tetralogy of Fallot?

A. ASD
B. Right ventricular hypertrophy
C. Pulmonary stenosis (Correct Answer)
D. None of the options

Explanation: ***Pulmonary stenosis*** - **Pulmonary stenosis** is one of the four primary defects that define Tetralogy of Fallot, specifically an **obstruction to right ventricular outflow** [1]. - The severity of this stenosis largely determines the clinical presentation and degree of cyanosis in patients with Tetralogy of Fallot [1]. *ASD* - An **Atrial Septal Defect (ASD)** is not considered a primary component of Tetralogy of Fallot [2], although it can coexist in some patients. - The four classic defects of Tetralogy of Fallot are **pulmonary stenosis**, **ventricular septal defect (VSD)**, **overriding aorta**, and **right ventricular hypertrophy** [1]. *Right ventricular hypertrophy* - **Right ventricular hypertrophy** is a consequence of the increased workload on the right ventricle due to severe pulmonary stenosis and the **ventricular septal defect (VSD)** [1]. - While it is a characteristic finding, it technically develops secondary to the other primary defects, rather than being an initiating structural malformation itself. *None of the options* - This option is incorrect because **pulmonary stenosis** is a definitive and primary component of Tetralogy of Fallot [1]. - The disease is defined by a specific set of four defects, one of which is pulmonary stenosis [1].

Question 2: A 45-year-old woman presents with clubbing and cyanosis. Chest X-ray shows a prominent pulmonary artery. Which congenital heart disease should be considered?

A. Patent ductus arteriosus (PDA) with Eisenmenger syndrome.
B. Atrial septal defect (ASD) with Eisenmenger syndrome. (Correct Answer)
C. Tetralogy of Fallot
D. Pulmonary stenosis (PS)

Explanation: Atrial septal defect (ASD) with Eisenmenger syndrome. - Clubbing, cyanosis, and a prominent pulmonary artery in a 45-year-old suggest long-standing pulmonary hypertension with shunt reversal, characteristic of Eisenmenger syndrome [1]. - An ASD is a common congenital heart defect that can lead to significant left-to-right shunting, eventually causing pulmonary hypertension [1]. and reversed shunt flow (Eisenmenger syndrome) over decades [2]. *Patent ductus arteriosus (PDA) with Eisenmenger syndrome.* - While PDA can also lead to Eisenmenger syndrome, it typically presents with a continuous murmur and often causes symptoms earlier in life if the shunt is large. - The patient's age and the specific features presented are more classic for an ASD progressing to Eisenmenger syndrome. *Tetralogy of Fallot* - This is a cyanotic congenital heart disease from birth or early childhood, commonly presenting with cyanosis and "tet spells" [3]. - While it causes cyanosis, a prominent pulmonary artery is not a typical feature; instead, there is often reduced pulmonary blood flow and a small pulmonary artery due to pulmonary outflow obstruction [3]. *Pulmonary stenosis (PS)* - Pulmonary stenosis primarily causes obstruction to blood flow out of the right ventricle, leading to right ventricular hypertrophy and potentially a systolic murmur. - While severe PS can cause cyanosis due to a right-to-left shunt through an ASD (if present), isolated PS is typically acyanotic and does not usually present with a prominent pulmonary artery or clubbing unless it's very severe and associated with other defects.

Question 3: 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 4: Tetralogy of Fallot is characterized by following except –

A. VSD
B. Over–riding of aorta
C. Infundibular constriction
D. AS (Correct Answer)

Explanation: ***AS (Aortic Stenosis)*** - **Aortic stenosis (AS)** is characterized by a **narrowing of the aortic valve**, obstructing blood flow from the left ventricle to the aorta. - This is **NOT a component of Tetralogy of Fallot** and is a separate congenital or acquired cardiac condition. - The four main features of Tetralogy of Fallot are **ventricular septal defect**, **pulmonary stenosis** (typically infundibular), **overriding aorta**, and **right ventricular hypertrophy**. *VSD (Ventricular Septal Defect)* - A **ventricular septal defect (VSD)** is a communication between the right and left ventricles, allowing blood to shunt between chambers. - This is **one of the four essential components** of Tetralogy of Fallot, typically a large, non-restrictive VSD. *Over-riding of aorta* - An **overriding aorta** means the aortic root is positioned directly over the ventricular septal defect, straddling both ventricles instead of arising solely from the left ventricle. - This is a **hallmark feature of Tetralogy of Fallot**, leading to mixing of oxygenated and deoxygenated blood, contributing to cyanosis. *Infundibular constriction* - **Infundibular constriction**, also known as **pulmonary infundibular stenosis**, refers to the narrowing of the muscular outflow tract of the right ventricle (infundibulum) leading to the pulmonary artery. - This **subvalvular pulmonary stenosis** is a **critical component of Tetralogy of Fallot**, contributing to right ventricular hypertrophy, reduced pulmonary blood flow, and right-to-left shunting through the VSD.

Question 5: Pulmonary plethora in a child presenting with cyanosis, is seen in?

A. Coarctation of the aorta
B. Total Anomalous Pulmonary Venous Connection (TAPVC) (Correct Answer)
C. Tetralogy of Fallot (TOF)
D. Tricuspid Atresia (TA)

Explanation: ***Total Anomalous Pulmonary Venous Connection (TAPVC)*** - In **non-obstructed TAPVC**, all pulmonary veins drain anomalously into the right atrium (or its tributaries) instead of the left atrium. - This causes **complete mixing of oxygenated pulmonary venous blood with deoxygenated systemic venous blood** in the right atrium → **cyanosis**. - Since an obligatory **atrial septal defect (ASD)** allows blood to reach the left heart, and there is **increased volume load on the right heart**, there is **increased pulmonary blood flow → pulmonary plethora** on chest X-ray. - Key point: **Obstructed TAPVC** causes pulmonary venous congestion and oligemia, NOT plethora. *Coarctation of the aorta* - **Coarctation of the aorta** is an **acyanotic** congenital heart disease involving systemic outflow obstruction. - It does **not cause cyanosis** unless there is differential cyanosis (lower body only) with a PDA and pulmonary hypertension causing right-to-left shunt. - Does not cause pulmonary plethora. *Tetralogy of Fallot (TOF)* - **Tetralogy of Fallot** presents with **cyanosis** due to right-to-left shunting through a VSD. - However, it has **pulmonary oligemia (decreased pulmonary blood flow)** due to right ventricular outflow tract obstruction and pulmonary stenosis. - Chest X-ray shows **boot-shaped heart** with decreased pulmonary vascular markings, NOT plethora. *Tricuspid Atresia (TA)* - **Tricuspid atresia** causes **cyanosis** due to obligatory right-to-left shunting at the atrial level. - Pulmonary blood flow is typically **decreased or normal** (depending on presence of VSD/PDA), NOT increased. - Does not typically cause pulmonary plethora.

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: Commonest type of congenital cyanotic heart disease is -

A. ASD
B. TOF (Correct Answer)
C. PDA
D. Single ventricle defects

Explanation: ***TOF (Correct Answer)*** - **Tetralogy of Fallot (TOF)** is the **most common cyanotic congenital heart disease**, accounting for approximately 10% of all congenital heart defects. - Characterized by **four main defects**: ventricular septal defect (VSD), pulmonary stenosis, overriding aorta, and right ventricular hypertrophy. - The degree of **pulmonary stenosis** determines the severity of cyanosis and clinical presentation. - Classic presentation includes **cyanotic spells** (Tet spells) and **squatting** behavior in children. *ASD (Incorrect)* - **Atrial Septal Defect (ASD)** is an **acyanotic** congenital heart defect with left-to-right shunting. - Does not cause cyanosis under normal circumstances because oxygenated blood from the left atrium shunts to the right atrium. - Symptoms are usually mild in childhood and may include fatigue or shortness of breath. *PDA (Incorrect)* - **Patent Ductus Arteriosus (PDA)** is generally an **acyanotic** heart defect with left-to-right shunting. - The ductus arteriosus remains open after birth, connecting the aorta to the pulmonary artery. - While it can cause **differential cyanosis** in rare instances of severe pulmonary hypertension with shunt reversal (Eisenmenger syndrome), it is not primarily classified as a cyanotic heart disease. *Single ventricle defects (Incorrect)* - **Single ventricle defects** (e.g., hypoplastic left heart syndrome, tricuspid atresia) are complex **cyanotic** heart defects, but they are **less common than Tetralogy of Fallot**. - These defects involve only one functional ventricle, leading to mixing of oxygenated and deoxygenated blood. - Require staged surgical palliation (e.g., Norwood, Glenn, Fontan procedures).

Question 8: A 6-year-old with congenital heart disease presents with fever, new-onset murmur, and petechiae. Blood cultures are pending, but initial Gram stain shows Gram-positive cocci. What is the most appropriate initial intervention?

A. Schedule for urgent valve replacement
B. Administer high-dose steroids
C. Start broad-spectrum antibiotics (Correct Answer)
D. Wait for susceptibility testing

Explanation: ***Start broad-spectrum antibiotics*** - The presentation of **fever**, **new-onset murmur**, **petechiae**, and **Gram-positive cocci** in a patient with **congenital heart disease** is highly suggestive of **infective endocarditis**. - Prompt initiation of **broad-spectrum antibiotics** is crucial to prevent further damage to the heart valves and systemic complications while awaiting definitive culture results. *Schedule for urgent valve replacement* - **Valve replacement** is a definitive treatment for severe valvular damage but is typically considered after initial medical management has failed or in cases of severe complications like heart failure or recurrent emboli. - It is not the initial intervention for suspected infective endocarditis. *Administer high-dose steroids* - **Steroids** are anti-inflammatory but are not indicated in the treatment of active bacterial infections like endocarditis. - Administering steroids could potentially worsen the infection by suppressing the immune response. *Wait for susceptibility testing* - **Waiting for susceptibility testing** to initiate treatment would delay critical care, allowing the infection to progress and increasing morbidity and mortality. - Initial treatment should be empiric, and antibiotics can be narrowed once susceptibility results are available.

Question 9: Which among the following is a sure sign of heart failure in an infant with congenital heart disease?

A. Pedal oedema
B. JVP
C. Liver enlargement (Correct Answer)
D. Basal crepitations

Explanation: ***Liver enlargement*** - **Hepatomegaly** is a reliable sign of **heart failure in infants** because the infant's liver is very compliant and readily distends with increased systemic venous pressure. - Due to a less developed compensatory mechanism, infants often manifest heart failure with signs related to **systemic congestion**, with liver enlargement being a primary indicator. *Pedal oedema* - **Pedal edema is uncommon in infants** with heart failure compared to adults, as they are often supine and have less hydrostatic pressure effect on their lower extremities. - When present, it might be due to other causes or a sign of very severe, chronic heart failure rather than an early or "sure" sign. *JVP* - **Jugular venous distension (JVD) is difficult to assess accurately in infants** due to their short, fat necks and the difficulty in positioning and visualizing the neck veins. - Therefore, it is generally considered an **unreliable physical sign** for diagnosing heart failure in this age group. *Basal crepitations* - **Basal crepitations (rales)** indicate pulmonary congestion and can be a sign of left-sided heart failure. - However, in infants, these can also be caused by **bronchiolitis**, **pneumonia**, or other respiratory infections, making them a less specific "sure sign" than liver enlargement.

Question 10: Which of the following cyanotic congenital heart disease is associated with increased risk of chest infections?

A. Tetralogy of Fallot
B. Truncus arteriosus (Correct Answer)
C. Tricuspid atresia
D. None of the options

Explanation: ***Truncus arteriosus*** - This condition involves a single great artery overriding a **ventricular septal defect**, leading to mixed systemic and pulmonary blood flow. - The **unrestricted pulmonary blood flow** results in **pulmonary hypertension** and edema, making the lungs vulnerable to frequent infections. *Tetralogy of Fallot* - Characterized by **reduced pulmonary blood flow** due to **pulmonary stenosis**, which typically protects the lungs from overload. - While patients can experience complications, an increased risk of frequent chest infections due to pulmonary overcirculation is not a primary feature. *Tricuspid atresia* - Involves the absence of the **tricuspid valve**, leading to mixing of blood in the atria and systemic circulation of deoxygenated blood. - Pulmonary blood flow can be reduced or normal, but severe pulmonary overcirculation leading to recurrent chest infections is not a hallmark. *None of the options* - This option is incorrect because **Truncus arteriosus** is indeed strongly associated with an increased risk of chest infections.

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