Cardiology Practice Questions

Q: What is the most common cause of congenital heart defects?

A viral infection in the mother during the first trimester. **Explanation:** Congenital Heart Defects (CHDs) occur due to abnormal cardiac development during organogenesis, which primarily takes place between the **3rd and 8th weeks** of gestation. **Why Option A is correct:** Environmental factors, specifically maternal viral infections during the first trimester, are well-established teratogenic causes of CHDs. The most classic example is **Rubella (German Measles)**. If a mother is infected with the Rubella virus during early pregnancy, it can lead to **Congenital Rubella Syndrome (CRS)**, which frequently manifests as Patent Ductus Arteriosus (PDA) and peripheral pulmonary artery stenosis. Other viruses, such as Coxsackie B, have also been implicated. **Why other options are incorrect:** * **Option B:** Maternal bacterial infections (like Urinary Tract Infections or Streptococcal infections) are generally not associated with structural cardiac malformations, though they may pose other risks like preterm labor or neonatal sepsis. * **Option C:** While NSAIDs are contraindicated in the **third trimester** because they cause premature closure of the Ductus Arteriosus, they are not the "most common" cause of structural heart defects in the first trimester compared to viral etiologies. **High-Yield Clinical Pearls for NEET-PG:** * **Most common overall cause of CHD:** Multifactorial inheritance (combination of genetic and environmental factors). * **Most common chromosomal cause:** Down Syndrome (Trisomy 21), specifically associated with Endocardial Cushion Defects (AVSD). * **Maternal Diabetes:** Associated with Transposition of the Great Arteries (TGA) and Hypertrophic Cardiomyopathy. * **Lithium intake:** Associated with Ebstein’s Anomaly. * **Alcohol (Fetal Alcohol Syndrome):** Most commonly associated with 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.

Q: Strawberry tongue is a clinical sign seen in which of the following conditions?

Kawasaki disease. **Explanation:** **Strawberry tongue** is a classic clinical sign characterized by a bright red, swollen tongue with prominent, enlarged fungiform papillae. It is a hallmark feature of **Kawasaki Disease (KD)**, a medium-vessel vasculitis that primarily affects children under five years of age. In KD, the strawberry tongue is part of the "Oropharyngeal changes" diagnostic criteria, which also includes cracked, erythematous lips and diffuse pharyngeal injection. **Analysis of Options:** * **Kawasaki Disease (Correct):** It presents with the "CRASH and Burn" mnemonic (Conjunctivitis, Rash, Adenopathy, Strawberry tongue/lips, Hand/foot edema, and high-grade Fever). * **Wegener Granulomatosis (Granulomatosis with Polyangiitis):** Typically presents with a "Strawberry Gingivitis" (friable, granular gums), not a strawberry tongue. It primarily affects the upper/lower respiratory tract and kidneys. * **Phenytoin Toxicity:** Classically associated with **Gingival Hyperplasia** (overgrowth of gums), not lingual changes. * **Polyarteritis Nodosa (PAN):** A systemic vasculitis that affects medium-sized arteries but lacks the specific mucocutaneous features (like strawberry tongue) seen in KD. **Clinical Pearls for NEET-PG:** 1. **Differential Diagnosis for Strawberry Tongue:** Besides Kawasaki Disease, it is also seen in **Scarlet Fever** (caused by Group A Streptococcus) and **Toxic Shock Syndrome**. 2. **White vs. Red Strawberry Tongue:** In Scarlet Fever, it starts as a "White Strawberry Tongue" (white coat with red papillae) and progresses to "Red Strawberry Tongue" by day 4-5. 3. **KD Complication:** The most dreaded complication is **Coronary Artery Aneurysms**. Treatment involves IVIG and high-dose Aspirin.

Question 1

What is the most common cause of congenital heart defects?

Accepted Answer

A viral infection in the mother during the first trimester

Answer

A bacterial infection in the mother during the first trimester

Answer

Consumption of NSAIDs by the mother during the first trimester

Answer

None of the above

Question 2

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 3

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 4

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 5

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 6

Squatting attacks and polycythemia are features of?

Accepted Answer

Cyanotic heart disease

Answer

Acyanotic heart disease

Answer

Eisenmenger syndrome

Answer

Lutembacher syndrome

Question 7

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 8

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

Question 9

What is the most common cause of death in patients with patent ductus arteriosus (PDA)?

Accepted Answer

Cardiac failure

Answer

Respiratory failure

Answer

Infective endocarditis

Answer

Embolization

Question 10

Strawberry tongue is a clinical sign seen in which of the following conditions?

Accepted Answer

Kawasaki disease

Answer

Wegener granulomatosis

Answer

Phenytoin toxicity

Answer

Polyarteritis nodosa

Cardiology — MCQs

Cardiology — MCQs

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