Cardiology — MCQs

Cardiology Indian Medical PG Practice Questions and MCQs

Question 151: Peripheral pulmonic stenosis may be seen in all of the following conditions EXCEPT:

A. Williams syndrome
B. Alagille syndrome
C. Rubella syndrome
D. Cytomegalovirus (CMV) infection (Correct Answer)

Explanation: **Explanation:** Peripheral Pulmonic Stenosis (PPS) refers to the narrowing of the pulmonary artery branches. It is a classic finding in specific genetic and infectious syndromes, but it is **not** associated with Cytomegalovirus (CMV) infection. **Why Option D is Correct:** While **Congenital CMV** is the most common intrauterine infection, its primary clinical manifestations are neurological and systemic (e.g., microcephaly, periventricular calcifications, sensorineural hearing loss, and petechiae). Unlike Rubella, CMV does not typically cause structural cardiac defects like PPS. **Why the Other Options are Incorrect:** * **Williams Syndrome (Option A):** Caused by a microdeletion on chromosome 7q11.23 (elastin gene). It is characteristically associated with **Supravalvular Aortic Stenosis** and peripheral pulmonic stenosis. * **Alagille Syndrome (Option B):** An autosomal dominant disorder (JAG1 mutation) characterized by paucity of interlobular bile ducts. PPS is the most common cardiovascular manifestation (seen in ~70% of cases), often occurring alongside Tetralogy of Fallot. * **Congenital Rubella Syndrome (Option C):** Classically presents with the triad of Cataracts, Sensorineural deafness, and Cardiac defects. The most common cardiac lesions are **Patent Ductus Arteriosus (PDA)** and peripheral pulmonic stenosis. **High-Yield Clinical Pearls for NEET-PG:** * **Williams Syndrome:** Look for "Elfin facies," hypercalcemia, and an outgoing "cocktail party" personality. * **Alagille Syndrome:** Look for "butterfly vertebrae," posterior embryotoxon in the eye, and cholestatic jaundice. * **Auscultation:** PPS presents as a systolic ejection murmur heard best at the upper left sternal border, radiating to the axilla and back. * **CMV vs. Rubella:** Remember—**R**ubella causes **R**ight-sided/Arterial lesions (PPS, PDA), while **C**MV causes **C**alcifications (Periventricular).

Question 152: Truncus arteriosus is most commonly associated with which of the following conditions?

A. Turner's syndrome
B. DiGeorge Syndrome (Correct Answer)
C. Klinefelter's syndrome
D. Down's syndrome

Explanation: **Explanation:** **Truncus Arteriosus** is a cyanotic congenital heart disease where a single great vessel fails to divide into the aorta and pulmonary artery due to the failure of the **conotruncal ridges** to fuse. This developmental process is heavily dependent on **neural crest cell migration**. **Why DiGeorge Syndrome is correct:** DiGeorge Syndrome (22q11.2 deletion syndrome) is characterized by the defective development of the 3rd and 4th pharyngeal pouches. Since neural crest cells contribute to both the pharyngeal pouches and the cardiac outflow tract, there is a strong association. Approximately **30-35%** of patients with Truncus Arteriosus have DiGeorge Syndrome. Conversely, Truncus Arteriosus is the most specific cardiac defect associated with this syndrome (along with Interrupted Aortic Arch Type B). **Why other options are incorrect:** * **Turner’s Syndrome (45, XO):** Most commonly associated with **Bicuspid Aortic Valve** (most common) and **Coarctation of the Aorta** (pre-ductal). * **Down’s Syndrome (Trisomy 21):** Most commonly associated with **Endocardial Cushion Defects** (Atrioventricular Septal Defects/AVSD). * **Klinefelter’s Syndrome (47, XXY):** Not typically associated with specific structural congenital heart defects; it is primarily a primary hypogonadism disorder. **High-Yield Clinical Pearls for NEET-PG:** * **CATCH-22 Mnemonic for DiGeorge:** **C**ardiac defects (Truncus), **A**bnormal facies, **T**hymic hypoplasia (T-cell deficiency), **C**left palate, **H**ypocalcemia (due to parathyroid hypoplasia). * **Chest X-ray:** Truncus arteriosus often presents with a "sitting duck" appearance or a right-sided aortic arch (seen in 25% of cases). * **Treatment:** Early surgical repair is mandatory to prevent irreversible pulmonary hypertension.

Question 153: Which of the following is NOT a characteristic feature of Congestive Heart Failure (CHF) in an infant?

A. Pedal edema (Correct Answer)
B. Tachypnea
C. Sweating
D. Poor weight gain

Explanation: In infants, the clinical presentation of Congestive Heart Failure (CHF) differs significantly from adults due to physiological differences and the inability of infants to communicate symptoms like dyspnea. **Explanation of the Correct Answer:** **A. Pedal Edema:** This is the correct answer because it is **not** a characteristic feature of CHF in infants. In adults, gravity causes fluid to accumulate in the lower extremities (pedal edema). However, infants spend most of their time in a supine position. Consequently, systemic venous congestion in infants manifests as **periorbital edema**, **sacral edema**, or **hepatomegaly** rather than pedal edema. **Explanation of Incorrect Options:** * **B. Tachypnea:** This is often the earliest sign of CHF in infants. It occurs due to pulmonary venous congestion and decreased lung compliance. * **C. Sweating:** Specifically "forehead sweating" during feeds is a hallmark sign. It results from excessive sympathetic nervous system activation as the body attempts to compensate for low cardiac output. * **D. Poor weight gain:** Also known as "failure to thrive," this occurs because the infant has a high metabolic demand (due to increased work of breathing and heart rate) but is unable to consume enough calories due to "suck-rest-suck" cycles and fatigue during feeding. **Clinical Pearls for NEET-PG:** * **Most common cause of CHF in the first week of life:** Hypoplastic Left Heart Syndrome (HLHS). * **Most common cause of CHF in the first month:** Coarctation of the aorta or large VSD. * **Feeding History:** Always look for "interrupted feeds" or taking more than 30 minutes to finish a bottle as a sign of pediatric CHF. * **Hepatomegaly** is a more reliable sign of right-sided failure in infants than JVP (which is difficult to assess due to short necks).

Question 154: Anatomical obliteration of the ductus arteriosus occurs at which time frame?

A. Birth
B. 3-4 days
C. 10 days
D. 30 days (Correct Answer)

Explanation: The closure of the Ductus Arteriosus (DA) occurs in two distinct stages: **functional closure** and **anatomical obliteration**. ### 1. Why Option D is Correct **Anatomical obliteration** refers to the permanent structural closure of the ductus through endothelial proliferation, subendothelial thickening, and fibrosis, eventually forming the **ligamentum arteriosum**. This process typically takes **2 to 3 weeks** in full-term infants, with completion generally cited at **30 days (1 month)**. ### 2. Why Other Options are Incorrect * **Option A (Birth):** At birth, the DA is widely patent to allow fetal circulation. It does not close immediately upon delivery. * **Option B (3-4 days):** This timeframe corresponds to **functional closure**. In term infants, the smooth muscle of the DA constricts in response to increased arterial oxygen tension ($PaO_2$) and decreased circulating Prostaglandin $E_2$. This usually occurs within 12–72 hours after birth. * **Option C (10 days):** While the process of fibrosis is underway by day 10, anatomical permanence is not yet achieved in the majority of infants. ### 3. NEET-PG High-Yield Pearls * **Functional vs. Anatomical:** Always distinguish between the two. Functional = Hours/Days (Triggered by $O_2$); Anatomical = Weeks (Triggered by fibrosis). * **Biochemical Mediators:** Prostaglandin **$E_2$** keeps the ductus open. **Indomethacin** or **Ibuprofen** (NSAIDs) are used to close a Patent Ductus Arteriosus (PDA) by inhibiting prostaglandin synthesis. * **Ductal Dependency:** In cyanotic heart diseases (e.g., Transposition of Great Arteries), **Alprostadil (PGE1 infusion)** is used to keep the ductus open for survival. * **Prematurity:** PDA is significantly more common in preterm infants due to poor ductal sensitivity to oxygen and higher circulating prostaglandin levels.

Question 155: Snowman shaped heart is typically seen in which of the following conditions?

A. Tetralogy of Fallot
B. Total Anomalous Pulmonary Venous Connection (Correct Answer)
C. Transposition of Great Vessels
D. Coarctation of the Aorta

Explanation: **Explanation:** The **"Snowman-shaped heart"** (also known as the **Figure-of-8** or **Cottage-loaf** appearance) is the classic radiological sign of **Supracardiac Total Anomalous Pulmonary Venous Connection (TAPVC)**. **Why it occurs (The Mechanism):** In supracardiac TAPVC, the pulmonary veins drain into a common pulmonary vein, which then drains into a **vertical vein** (left side). This vertical vein ascends to join the **left innominate vein**, which then drains into the **Right Superior Vena Cava (SVC)**. * **The "Head" of the snowman:** Formed by the dilated left vertical vein (left), the left innominate vein (top), and the dilated right SVC (right). * **The "Body" of the snowman:** Formed by the enlarged right atrium. **Analysis of Incorrect Options:** * **Tetralogy of Fallot (TOF):** Characterized by a **"Boot-shaped heart" (Coeur en sabot)** due to right ventricular hypertrophy (RVH) lifting the apex and a narrow pulmonary infundibulum (concave pulmonary bay). * **Transposition of Great Vessels (TGA):** Characterized by an **"Egg-on-side"** or **"Egg-on-a-string"** appearance due to a narrow mediastinum (stress-induced thymic atrophy and parallel orientation of great vessels). * **Coarctation of the Aorta:** Associated with the **"3 sign"** on X-ray (indentation of the aorta at the site of coarctation) and **rib notching** (Roesler’s sign) on the inferior borders of the 3rd to 8th ribs. **High-Yield Clinical Pearls for NEET-PG:** * **TAPVC Types:** Supracardiac is the most common (50%). Infracardiac TAPVC often presents with severe early cyanosis and a **normal-sized heart** with pulmonary edema. * **Box-shaped heart:** Seen in **Ebstein’s Anomaly** (massive right atrial enlargement). * **Sitting Duck sign:** Seen in **Persistent Truncus Arteriosus**. * **Goose-neck deformity:** Seen on angiography in **Endocardial Cushion Defects (AVCD)**.

Question 156: What is the characteristic cardiac defect in Williams syndrome?

A. Atrial Septal Defect (ASD)
B. Pulmonary Stenosis (PS)
C. Ventricular Septal Defect (VSD)
D. Supravalvular aortic stenosis (Correct Answer)

Explanation: ### Explanation **Correct Answer: D. Supravalvular aortic stenosis (SVAS)** **Understanding the Concept:** Williams syndrome (also known as Williams-Beuren syndrome) is a multisystemic neurodevelopmental disorder caused by a microdeletion on **chromosome 7q11.23**. This deleted region includes the **Elastin (ELN) gene**. Elastin is a crucial structural protein in the walls of large blood vessels. A deficiency in elastin leads to obstructive vascular lesions, the most characteristic of which is **Supravalvular Aortic Stenosis (SVAS)**—a narrowing of the ascending aorta just above the aortic valve. **Analysis of Incorrect Options:** * **A. Atrial Septal Defect (ASD):** While ASD is a common congenital heart defect, it is more typically associated with Holt-Oram syndrome or Down syndrome, not Williams syndrome. * **B. Pulmonary Stenosis (PS):** Peripheral pulmonary artery stenosis (PPS) is actually the second most common cardiac finding in Williams syndrome. However, isolated valvular PS is more characteristic of Noonan syndrome or Alagille syndrome. * **C. Ventricular Septal Defect (VSD):** VSD is the most common congenital heart disease overall but does not have a specific pathognomonic association with Williams syndrome. **High-Yield Clinical Pearls for NEET-PG:** * **Facial Features:** Often described as **"Elfin facies"** (broad forehead, periorbital puffiness, stellate iris pattern, long philtrum, and wide mouth). * **Personality:** Characterized by a **"Cocktail party personality"** (extreme friendliness, high social drive, and strong verbal skills despite intellectual disability). * **Metabolic Abnormality:** **Idiopathic Infantile Hypercalcemia** is a classic board-favorite association. * **Vascular Involvement:** Besides SVAS, patients may have renal artery stenosis, leading to secondary hypertension.

Question 157: Right axis deviation is seen in all of the following conditions except?

A. Ventricular septal defect (VSD)
B. Tricuspid atresia (Correct Answer)
C. Pulmonary atresia
D. Atrial septal defect (ASD)

Explanation: **Explanation:** The key to answering this question lies in understanding the hemodynamic consequences of congenital heart defects on ventricular dominance. **Why Tricuspid Atresia is the Correct Answer:** In **Tricuspid Atresia**, there is no communication between the right atrium and the right ventricle. This leads to an obligatory right-to-left shunt (via an ASD) and a hypoplastic right ventricle. Consequently, the left ventricle handles the entire systemic and pulmonary venous return, leading to **Left Ventricular Hypertrophy (LVH)**. On an ECG, this manifests as **Left Axis Deviation (LAD)**. In a cyanotic neonate, the presence of LAD is a classic, high-yield diagnostic hallmark for Tricuspid Atresia. **Analysis of Incorrect Options:** * **Ventricular Septal Defect (VSD):** Large VSDs cause left-to-right shunting, leading to pulmonary hypertension and eventual right ventricular hypertrophy (RVH), which results in **Right Axis Deviation (RAD)**. * **Pulmonary Atresia:** This condition causes significant pressure overload on the right side of the heart (unless the septum is intact and the RV is hypoplastic), typically leading to **RAD**. * **Atrial Septal Defect (ASD):** ASDs cause a volume overload of the right ventricle, leading to RVH and a characteristic **RAD** with an RSR' pattern in V1 (incomplete RBBB). **NEET-PG High-Yield Pearls:** 1. **Cyanotic Heart Disease + LAD:** Think **Tricuspid Atresia** or **AV Canal Defect (ECD)**. 2. **Cyanotic Heart Disease + RAD:** Think **Tetralogy of Fallot (TOF)** or **Transposition of the Great Arteries (TGA)**. 3. **ASD ECG Triad:** RAD, Right Bundle Branch Block (RBBB), and Right Ventricular Hypertrophy.

Question 158: Which of the following are manifestations of Tetralogy of Fallot?

A. Left axis deviation
B. Left ventricular hypertrophy
C. Ventricular Septal Defect (Correct Answer)
D. Blalock-Taussig shunt is between the pulmonary artery and subclavian artery

Explanation: **Explanation:** Tetralogy of Fallot (TOF) is the most common cyanotic congenital heart disease (CCHD) after the first year of life. It is characterized by a single developmental defect: the **anterior malalignment of the infundibular (conotruncal) septum**. This leads to the classic tetrad: 1. **Large Ventricular Septal Defect (VSD)** (Subaortic) 2. **Right Ventricular Outflow Tract Obstruction (RVOTO)** (Infundibular stenosis) 3. **Overriding of the Aorta** 4. **Right Ventricular Hypertrophy (RVH)** **Analysis of Options:** * **Option C (Correct):** A large, non-restrictive VSD is a core component of the tetrad, allowing for right-to-left shunting when RVOTO is severe. * **Option A & B (Incorrect):** TOF causes pressure overload on the right side. Therefore, the ECG typically shows **Right Axis Deviation (RAD)** and **Right Ventricular Hypertrophy (RVH)**. Left-sided findings suggest other pathologies like Tricuspid Atresia (which presents with LAD). * **Option D (Incorrect):** While the Blalock-Taussig (BT) shunt is used in TOF management, it is a **palliative procedure**, not a manifestation of the disease itself. Furthermore, the classic BT shunt is between the subclavian artery and the pulmonary artery. **Clinical Pearls for NEET-PG:** * **X-ray Finding:** "Boot-shaped heart" (Coeur en sabot) due to an upturned apex (RVH) and a concave pulmonary segment. * **Management of "Tet Spells":** Knee-chest position (increases systemic vascular resistance), Oxygen, Morphine, and Beta-blockers (Propranolol). * **Murmur:** The cyanosis in TOF is inversely proportional to the intensity of the murmur. The murmur is due to RVOTO (ejection systolic), not the VSD.

Question 159: Which congenital cyanotic heart disease is characterized by Left Ventricular hypertrophy and Left atrial enlargement?

A. Coarctation of Aorta
B. Tricuspid atresia (Correct Answer)
C. Ebstein's anomaly
D. Transposition of great arteries

Explanation: **Explanation:** **Tricuspid Atresia** is the correct answer because it is the only common cyanotic congenital heart disease (CCHD) characterized by **Left Axis Deviation (LAD)** and **Left Ventricular Hypertrophy (LVH)** on ECG. 1. **Why it is correct:** In Tricuspid Atresia, there is no communication between the right atrium and right ventricle. Blood must flow through an ASD/Patent Foramen Ovale to the left atrium (causing **LA enlargement**) and then into the left ventricle. Since the left ventricle handles the entire systemic and pulmonary venous return, it undergoes compensatory **hypertrophy**. The right ventricle is typically hypoplastic, leading to the classic "Left Axis Deviation" on ECG—a high-yield finding for NEET-PG. 2. **Why incorrect options are wrong:** * **Coarctation of Aorta:** This is an acyanotic heart disease. While it causes LVH due to increased afterload, it does not typically present with cyanosis in the neonatal period unless associated with other complex shunts. * **Ebstein’s Anomaly:** Characterized by "giant" right atrium and right ventricular dysfunction. The ECG typically shows Right Bundle Branch Block (RBBB) and tall "Himalayan" P waves, not LVH. * **Transposition of Great Arteries (TGA):** Typically presents with Right Ventricular Hypertrophy (RVH) and right axis deviation because the RV acts as the systemic pump. **High-Yield Clinical Pearls for NEET-PG:** * **The "Left Axis" Rule:** If a cyanotic neonate has Left Axis Deviation on ECG, the diagnosis is **Tricuspid Atresia** until proven otherwise. * **Chest X-ray:** Shows a "sitting duck" or "boot-shaped" heart (due to RV hypoplasia) with oligemic lung fields. * **Associated Defect:** A VSD or PDA is necessary for pulmonary blood flow and survival.

Question 160: Which of the following is a FALSE feature regarding Atrial Septal Defect (ASD)?

A. Pulmonary plethora leads to pulmonary hypertension.
B. Murmur presents early in the course of disease. (Correct Answer)
C. Flow murmur is present, leading to a mid-diastolic murmur.
D. Shunt murmur is absent.

Explanation: **Explanation:** In Atrial Septal Defect (ASD), the pressure gradient between the left and right atria is minimal. Consequently, the blood flow across the defect is laminar and does not produce a "shunt murmur." This is a critical distinction from Ventricular Septal Defect (VSD), where high-pressure gradients produce early murmurs. **Why Option B is the Correct (False) Statement:** The murmur in ASD is **not** due to the shunt itself, but due to the increased volume of blood passing through the valves. It takes time for the right ventricle to become compliant enough to handle the large volume load. Therefore, the characteristic murmurs of ASD (Ejection Systolic Murmur and Mid-diastolic Murmur) typically appear **later in childhood**, usually after 2–3 years of age, rather than early in the neonatal period. **Analysis of Other Options:** * **Option A (True):** Increased pulmonary blood flow (pulmonary plethora) leads to structural changes in pulmonary vasculature, eventually causing pulmonary hypertension (though this usually takes decades in ASD). * **Option C (True):** The increased blood flow across the **Tricuspid valve** (relative tricuspid stenosis) creates a low-pitched **mid-diastolic murmur**, best heard at the lower left sternal border. * **Option D (True):** As mentioned, the pressure difference between atria is too low to generate a murmur; thus, a "shunt murmur" is absent. **High-Yield Clinical Pearls for NEET-PG:** * **Characteristic Sign:** Wide, fixed split S2 (due to delayed closure of the pulmonary valve). * **Most Common Type:** Ostium Secundum (75%). * **ECG Findings:** Right axis deviation and RSR' pattern in V1 (incomplete RBBB). * **Ejection Systolic Murmur (ESM):** Heard in the pulmonary area due to increased flow across the pulmonary valve (relative pulmonary stenosis).

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