Cardiology Practice Questions

Q: Ductus arteriosus dependent blood flow is mandatory in all of the following congenital heart diseases EXCEPT:

Truncus arteriosus. **Explanation:** In pediatric cardiology, **ductal-dependent lesions** are congenital heart defects where the patency of the Ductus Arteriosus (DA) is essential for either systemic or pulmonary circulation. **1. Why Truncus Arteriosus is the Correct Answer:** In **Truncus Arteriosus**, a single large vessel arises from both ventricles, supplying the systemic, pulmonary, and coronary circulations. Because there is a common outflow tract, blood can reach the lungs and the body regardless of whether the ductus arteriosus is open or closed. While it is a cyanotic heart disease, it is **not** ductal-dependent for survival. **2. Analysis of Incorrect Options (Ductal-Dependent Lesions):** * **Hypoplastic Left Heart Syndrome (HLHS):** This is a ductal-dependent **systemic** circulation lesion. The left side of the heart cannot support systemic flow; thus, blood must flow from the pulmonary artery through the ductus to the aorta to perfuse the body. * **TGA with Intact Ventricular Septum:** This is a ductal-dependent **mixing** lesion. Since the systemic and pulmonary circulations are in parallel (rather than series), the ductus (or an ASD) is mandatory to allow oxygenated blood to reach the systemic circulation. * **Obliterated (Interrupted) Aortic Arch:** This is a ductal-dependent **systemic** circulation lesion. There is no luminal continuity between the ascending and descending aorta; the lower body is entirely dependent on right-to-left flow through the ductus. **Clinical Pearls for NEET-PG:** * **Management:** Prostaglandin E1 (Alprostadil) infusion is the immediate life-saving treatment to keep the ductus open in these conditions. * **Ductal-dependent Pulmonary flow:** Includes Pulmonary Atresia and Critical Pulmonary Stenosis. * **Ductal-dependent Systemic flow:** Includes HLHS, Critical Coarctation of the Aorta, and Interrupted Aortic Arch.

Q: Which of the following cyanotic heart diseases is associated with left axis deviation and left ventricular hypertrophy?

Tricuspid atresia. **Explanation:** In the context of cyanotic congenital heart disease (CCHD), the presence of **Left Axis Deviation (LAD)** and **Left Ventricular Hypertrophy (LVH)** on an ECG is a classic "high-yield" finding diagnostic of **Tricuspid Atresia**. 1. **Why Tricuspid Atresia is correct:** In Tricuspid Atresia, there is no communication between the right atrium and right ventricle. Blood must flow through an ASD to the left atrium and then into the **Left Ventricle (LV)**. The LV becomes the main pumping chamber for both systemic and pulmonary circulations (via a VSD or PDA), leading to LV volume overload and hypertrophy. The right ventricle is typically hypoplastic, causing the electrical axis to shift leftward. 2. **Why other options are incorrect:** * **Transposition of Great Vessels (TGA):** Typically presents with Right Axis Deviation (RAD) and Right Ventricular Hypertrophy (RVH) because the RV remains the systemic ventricle. * **Truncus Arteriosus:** Usually presents with biventricular hypertrophy or normal axis; it does not characteristically show isolated LAD. * **TAPVC:** Characterized by severe right-sided pressure and volume overload, leading to marked RAD and RVH. **High-Yield Clinical Pearls for NEET-PG:** * **The "LAD + Cyanosis" Duo:** If a neonate is cyanotic and the ECG shows LAD, think **Tricuspid Atresia** or **Tricuspid Stenosis**. * **X-ray finding:** Tricuspid atresia often shows a "Wall-to-Wall" heart or a "sitting duck" appearance (though less specific than the ECG). * **Management:** Requires a staged surgical approach: Blalock-Taussig shunt → Glenn procedure → Fontan procedure.

Q: What is the commonest type of cyanotic heart disease?

Tetralogy of Fallot (TOF). ### Explanation **Correct Answer: C. Tetralogy of Fallot (TOF)** **Why it is correct:** Congenital heart diseases (CHD) are broadly classified into **Acyanotic** (left-to-right shunt) and **Cyanotic** (right-to-left shunt). **Tetralogy of Fallot (TOF)** is the most common cyanotic heart disease beyond the neonatal period. It consists of four classic features: Ventricular Septal Defect (VSD), Overriding of the aorta, Right Ventricular Outflow Tract Obstruction (RVOTO/Pulmonary stenosis), and Right Ventricular Hypertrophy (RVH). The degree of cyanosis in TOF is primarily determined by the severity of the pulmonary stenosis. **Why the other options are incorrect:** * **A, B, and D (ASD, VSD, and PDA):** These are all **Acyanotic** heart diseases characterized by left-to-right shunting. While they are more common overall than cyanotic defects, they do not cause cyanosis unless Eisenmenger syndrome (reversal of shunt) develops later in life. * **VSD** is the overall most common congenital heart disease. * **ASD** is the most common CHD to present in adulthood. **NEET-PG High-Yield Pearls:** * **Most common cyanotic CHD at birth (Neonatal period):** Transposition of the Great Arteries (TGA). * **Most common cyanotic CHD overall (Infancy/Childhood):** Tetralogy of Fallot (TOF). * **X-ray finding in TOF:** "Boot-shaped heart" (Coeur en sabot) due to an upturned apex from RVH and a concave pulmonary segment. * **Management of "Tet Spells":** Knee-chest position (increases systemic vascular resistance), Oxygen, Morphine, and Beta-blockers. * **Most common overall CHD:** Ventricular Septal Defect (VSD).

Q: Which of the following statements about total anomalous pulmonary venous connection is FALSE?

None of the above statements are false.. **Total Anomalous Pulmonary Venous Connection (TAPVC)** is a cyanotic congenital heart disease where all four pulmonary veins fail to connect to the left atrium, instead draining into the right atrium or systemic venous circulation. ### **Explanation of Options:** * **Option A (True):** In TAPVC, the pulmonary veins typically join to form a **common pulmonary venous trunk** (confluence) behind the left atrium. This trunk then drains into the systemic venous system (e.g., via the vertical vein in the supracardiac type). * **Option B (True):** TAPVC is an "obligatory shunt" condition. For survival, an **Atrial Septal Defect (ASD)** or a patent foramen ovale must be present to allow blood to reach the left side of the heart. While it is almost universally present for survival, it is considered an **associated compensatory defect** rather than an intrinsic part of the anomalous connection itself. * **Option C (True):** The **Supracardiac type** (Type I) is the most common. It creates a characteristic "Figure-of-8" or **"Snowman" appearance** on a chest X-ray. This is formed by the dilated vertical vein (left), superior vena cava (right), and the innominate vein (top), sitting above the normal heart shadow. Since all statements (A, B, and C) are medically accurate, **Option D** is the correct choice. ### **High-Yield Clinical Pearls for NEET-PG:** * **Classification (Darling’s):** * **Type I (Supracardiac):** Most common; Snowman sign. * **Type II (Cardiac):** Drains into Coronary Sinus. * **Type III (Infracardiac):** Drains into Portal vein; **most likely to be obstructed**, presenting with early, severe cyanosis and pulmonary edema. * **Clinical Sign:** A quadruple rhythm (fixed split S2 + S3 + S4) is often heard. * **ECG:** Shows Right Axis Deviation (RAD) and Right Ventricular Hypertrophy (RVH).

Q: A newborn baby is readmitted to the hospital with hypoxia and upon testing is found to have pulmonary stenosis, dextraposition of the aorta, interventricular septal defect, and hypertrophy of the right ventricle. Which of the following is best described by these symptoms?

Tetralogy of Fallot. **Explanation:** The clinical presentation described is the classic anatomical quartet of **Tetralogy of Fallot (TOF)**, which is the most common cyanotic congenital heart disease (CHD) presenting after the neonatal period. **1. Why Tetralogy of Fallot is Correct:** TOF is defined by four specific structural defects resulting from the anterior and cephalad deviation of the infundibular (outflow tract) septum: * **Pulmonary Stenosis:** Usually infundibular, determining the degree of cyanosis. * **Right Ventricular Hypertrophy (RVH):** A result of the heart pumping against high pressure (pulmonary obstruction). * **Overriding Aorta (Dextraposition):** The aorta sits over the ventricular septal defect. * **Ventricular Septal Defect (VSD):** Typically a large, non-restrictive malalignment defect. **2. Why Other Options are Incorrect:** * **ASD:** An acyanotic CHD involving a hole in the interatrial septum; it does not feature ventricular hypertrophy or aortic malposition. * **PDA:** An acyanotic CHD characterized by a persistent connection between the aorta and pulmonary artery, typically presenting with a continuous "machinery" murmur. * **Aortic Stenosis:** An obstructive lesion of the left heart; while it causes left ventricular hypertrophy, it does not involve VSDs or pulmonary stenosis. **3. NEET-PG High-Yield Pearls:** * **X-ray Finding:** "Boot-shaped heart" (*Coeur en sabot*) due to an upturned apex (RVH) and concave pulmonary segment. * **Clinical Feature:** **"Tet Spells"** (hypercyanotic episodes) occur during crying or feeding. Management involves the **knee-chest position** to increase systemic vascular resistance. * **Murmur:** The murmur in TOF is due to **pulmonary stenosis** (ejection systolic), not the VSD. * **ECG:** Shows Right Axis Deviation and RVH.

Q: Squatting attacks and polycythemia are features of?

Cyanotic heart disease. **Explanation:** The presence of **squatting attacks** and **polycythemia** is a hallmark of **Cyanotic Heart Disease (CHD)**, specifically those with decreased pulmonary blood flow like **Tetralogy of Fallot (TOF)**. 1. **Why Cyanotic Heart Disease is correct:** * **Squatting Attacks:** In TOF, squatting increases systemic vascular resistance (SVR) by kinking the femoral arteries. This increase in SVR reduces the right-to-left shunt across the VSD, forcing more blood into the pulmonary artery, thereby improving oxygenation. * **Polycythemia:** Chronic hypoxemia triggers the kidneys to release erythropoietin, stimulating the bone marrow to produce more red blood cells. This compensatory erythrocytosis (polycythemia) increases the oxygen-carrying capacity but also increases blood viscosity. 2. **Why other options are incorrect:** * **Acyanotic Heart Disease:** These conditions (e.g., VSD, ASD, PDA) involve left-to-right shunts. Patients are not typically hypoxic at rest and do not require squatting to improve oxygenation. * **Eisenmenger Syndrome:** While this involves cyanosis due to a reversed shunt, squatting is not a characteristic clinical feature. These patients have fixed pulmonary hypertension, and squatting does not significantly alleviate their pathophysiology. * **Lutembacher Syndrome:** This is a specific combination of an **Atrial Septal Defect (ASD)** and **Mitral Stenosis**. It is primarily an acyanotic condition unless complications arise. **High-Yield Clinical Pearls for NEET-PG:** * **Boot-shaped heart** (Coeur en sabot) on X-ray is classic for TOF. * **Hypercyanotic spells (Tet spells)** are managed by the knee-chest position, oxygen, morphine, and beta-blockers (Propranolol). * **Complications of Polycythemia:** Increased risk of cerebral venous thrombosis and brain abscesses in children with CHD. * **Clubbing** is another common feature of chronic cyanotic heart disease.

Q: What vascular anomaly is most associated with severe tracheobronchial anomalies?

Pulmonary artery sling. **Explanation:** The correct answer is **Pulmonary Artery Sling (Option C)**. This anomaly occurs when the left pulmonary artery (LPA) originates from the right pulmonary artery instead of the main pulmonary trunk. To reach the left lung, the LPA courses between the trachea and the esophagus, forming a "sling" around the right mainstem bronchus and distal trachea. **Why it is the correct answer:** Unlike other vascular rings, a pulmonary artery sling is uniquely associated with **"Ring-Sling Complex."** In approximately 50% of cases, it is associated with intrinsic tracheobronchial abnormalities, most notably **complete tracheal rings** (O-shaped rings instead of C-shaped), leading to long-segment tracheal stenosis. This makes it the vascular anomaly with the highest morbidity regarding the airway. **Why other options are incorrect:** * **Double Aortic Arch (Option B):** While this is the most common cause of a symptomatic vascular ring and causes significant extrinsic compression of both the trachea and esophagus, it is generally *not* associated with intrinsic tracheobronchial cartilage anomalies. * **Right Aortic Arch with Left Subclavian (Option A):** This often forms a ring via a left-sided ligamentum arteriosum. While it causes compression, it lacks the embryological association with primary airway malformations seen in pulmonary artery slings. **High-Yield Clinical Pearls for NEET-PG:** * **Barium Swallow Finding:** Pulmonary artery sling is the *only* vascular anomaly that causes an **anterior indentation** on the esophagus (as it passes between the trachea and esophagus). * **Clinical Presentation:** Presents with "stridor since birth," wheezing, and respiratory distress that does not improve with neck extension. * **Imaging:** Echocardiography is the initial screening tool, but CT/MRI is the gold standard for visualizing the airway-vessel relationship.

Question 1

Ductus arteriosus dependent blood flow is mandatory in all of the following congenital heart diseases EXCEPT:

Accepted Answer

Truncus arteriosus

Answer

Hypoplastic left heart syndrome

Answer

Transposition of the great arteries with intact ventricular septum

Answer

Obliterated aortic arch

Question 2

Which of the following cyanotic heart diseases is associated with left axis deviation and left ventricular hypertrophy?

Accepted Answer

Tricuspid atresia

Answer

Transposition of great vessels

Answer

Truncus arteriosus

Answer

Total anomalous pulmonary venous drainage

Question 3

What is the commonest type of cyanotic heart disease?

Accepted Answer

Tetralogy of Fallot (TOF)

Answer

Atrial Septal Defect (ASD)

Answer

Ventricular Septal Defect (VSD)

Answer

Patent Ductus Arteriosus (PDA)

Question 4

Which of the following statements about total anomalous pulmonary venous connection is FALSE?

Accepted Answer

None of the above statements are false.

Answer

All pulmonary veins enter via a single trunk.

Answer

It is not always associated with septal defects.

Answer

Radiologically, it can present with a figure of 8 appearance.

Question 5

A newborn baby is readmitted to the hospital with hypoxia and upon testing is found to have pulmonary stenosis, dextraposition of the aorta, interventricular septal defect, and hypertrophy of the right ventricle. Which of the following is best described by these symptoms?

Accepted Answer

Tetralogy of Fallot

Answer

Atrial septal defect (ASD)

Answer

Patent ductus arteriosus (PDA)

Answer

Aortic stenosis

Question 6

A patient with a ventricular septal defect (VSD) develops pulmonary hypertension. Which of the following findings will be present?

Accepted Answer

Initial resolution of symptoms

Answer

Ejection systolic murmur in the pulmonary area

Answer

Clubbing

Answer

Palpable A2

Question 7

A 4-month-old infant with Tetralogy of Fallot presents with fever and loose stools. Which of the following is compatible with the diagnosis of Tetralogy spells?

Accepted Answer

Inability to hear a murmur

Answer

Oxygen saturation < 70% in room air

Answer

Hepatomegaly

Answer

S3 gallop rhythm

Question 8

Squatting attacks and polycythemia are features of?

Accepted Answer

Cyanotic heart disease

Answer

Acyanotic heart disease

Answer

Eisenmenger syndrome

Answer

Lutembacher syndrome

Question 9

What vascular anomaly is most associated with severe tracheobronchial anomalies?

Accepted Answer

Pulmonary artery sling

Answer

Right aortic arch, left subclavian artery

Answer

Double aortic arch

Answer

All of the above

Question 10

A Carey Coomb's murmur heard in a child with multiple joint pains is suggestive of?

Accepted Answer

Rheumatic fever

Answer

Infective endocarditis

Answer

Rheumatoid arthritis

Answer

Libman-Sack's endocarditis

Cardiology — MCQs

Cardiology — MCQs

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