Cardiology Practice Questions

Q: What is the most likely cardiac lesion in a young adult who complains of headache, dizziness, and intermittent claudication with exercise?

Coarctation of the aorta. **Explanation:** The clinical presentation of **headache, dizziness, and intermittent claudication** in a young adult is a classic triad for **Coarctation of the Aorta (CoA)**. **1. Why Coarctation of the Aorta is correct:** CoA is a localized narrowing of the aorta, typically distal to the origin of the left subclavian artery (juxtaductal). This creates a pressure gradient: * **Proximal to the obstruction:** Hypertension occurs in the upper body, leading to **headaches, dizziness, and epistaxis**. * **Distal to the obstruction:** Hypotension and reduced blood flow occur in the lower body, causing **intermittent claudication** (leg pain during exercise) and cold extremities. * **Physical Exam:** The hallmark is **radio-femoral delay** and a significant blood pressure difference between the upper and lower limbs. **2. Why the other options are incorrect:** * **Tetralogy of Fallot (TOF):** A cyanotic heart disease characterized by "Tet spells" and squatting. It does not typically cause upper body hypertension or claudication. * **Atrial Septal Defect (ASD):** Usually asymptomatic in childhood; presents in adulthood with dyspnea, palpitations, or paradoxical embolism. It features a **fixed split S2**. * **Patent Ductus Arteriosus (PDA):** Characterized by a **continuous machinery murmur** and bounding pulses. It does not cause a pressure differential between the arms and legs. **High-Yield Clinical Pearls for NEET-PG:** * **Chest X-ray:** Look for the **"3" sign** (indentation of the aorta) and **rib notching** (due to collateral flow through intercostal arteries). * **Association:** Strongly associated with **Turner Syndrome** (bicuspid aortic valve is the most common associated cardiac anomaly). * **Diagnosis:** Echocardiography is initial; CT Angiography is the gold standard for anatomy.

Q: Which of the following is NOT used in the treatment of cyanotic spells in a patient with Tetralogy of Fallot?

Calcium chloride. **Explanation:** The management of a cyanotic spell (Tet spell) in Tetralogy of Fallot (TOF) focuses on two primary goals: **increasing systemic vascular resistance (SVR)** and **decreasing pulmonary vascular resistance (PVR)** to reverse the right-to-left shunt. **Why Calcium Chloride is the correct answer:** Calcium chloride is a positive inotrope. In TOF, cyanotic spells are often triggered by infundibular spasms (spasm of the right ventricular outflow tract). Increasing myocardial contractility with calcium can worsen this infundibular obstruction, thereby exacerbating the right-to-left shunt and worsening cyanosis. Therefore, it is **not** used in the management of acute spells. **Analysis of incorrect options:** * **Phenylephrine (A):** This is a potent alpha-1 agonist that increases SVR. By raising systemic pressure, it forces blood from the right ventricle into the pulmonary artery rather than through the VSD, improving oxygenation. * **Propranolol (B):** A beta-blocker used to relax the infundibular muscle spasm and reduce the heart rate, which improves right ventricular filling and pulmonary blood flow. * **Sodium Bicarbonate (D):** Used to correct metabolic acidosis resulting from prolonged hypoxia. Correcting acidosis is crucial as it reduces the respiratory drive and decreases PVR. **High-Yield Clinical Pearls for NEET-PG:** * **First-line management:** Knee-chest position (increases SVR by kinking femoral arteries). * **Drug of choice for sedation:** Morphine (suppresses the respiratory center and reduces hyperpnea). * **Definitive treatment:** Surgical repair (Blalock-Taussig shunt or total correction). * **Classic X-ray finding:** Boot-shaped heart (Coeur en sabot) due to RVH and upturned apex.

Q: What is the most common type of Ventricular Septal Defect (VSD)?

Membranous. **Explanation:** Ventricular Septal Defect (VSD) is the most common congenital heart disease (CHD) at birth. The ventricular septum is a complex structure divided into a small superior membranous portion and a large inferior muscular portion. **Why Membranous is Correct:** **Membranous VSDs** (specifically perimembranous) are the most common type, accounting for approximately **70-80%** of all cases. They occur in the membranous part of the interventricular septum, located just below the aortic valve and near the tricuspid valve. Their high frequency is due to the complex embryological fusion of the endocardial cushions, the interventricular septum, and the conotruncal septum in this specific region. **Why Other Options are Incorrect:** * **Muscular VSD:** These occur in the lower, muscular part of the septum. While they are the most common type to undergo **spontaneous closure**, they account for only about 5-20% of clinically significant VSDs. * **Multiple VSDs:** Often referred to as "Swiss-cheese" defects, these are multiple openings in the muscular septum. They are relatively rare compared to isolated membranous defects. **High-Yield Clinical Pearls for NEET-PG:** * **Most common CHD overall:** VSD (excluding bicuspid aortic valve). * **Most common VSD to close spontaneously:** Muscular VSD. * **Most common VSD in Down Syndrome:** Atrioventricular canal defect (Endocardial cushion defect). * **Clinical Sign:** A harsh, holosystolic (pansystolic) murmur best heard at the left lower sternal border. * **Eisenmenger Syndrome:** Occurs when a long-standing left-to-right shunt leads to pulmonary hypertension, causing the shunt to reverse (right-to-left), resulting in cyanosis.

Q: The 'figure of eight' sign on chest radiography is typically seen in which of the following conditions?

Total Anomalous Pulmonary Venous Connection (TAPVC). ### Explanation The **'Figure of 8' sign** (also known as the **Snowman sign** or **Cottage loaf sign**) is the classic radiographic hallmark of **Supracardiac Total Anomalous Pulmonary Venous Connection (TAPVC)**. #### 1. Why TAPVC is Correct In supracardiac TAPVC, all four pulmonary veins drain into a common pulmonary vein, which then drains into the **Left Innominate (Brachiocephalic) vein** via a vertical vein. This eventually empties into the **Superior Vena Cava (SVC)**. * The **upper loop** of the "8" is formed by the dilated vertical vein (left), the left innominate vein (top), and the dilated SVC (right). * The **lower loop** is formed by the normal heart shadow (right atrium). * *Note:* This sign is usually not seen in the neonatal period as it takes time for the vessels to dilate; it typically appears after 4–6 weeks of life. #### 2. Why Other Options are Incorrect * **Transposition of Great Arteries (TGA):** Characterized by the **'Egg-on-a-string'** appearance due to a narrow mediastinum (caused by thymic atrophy and the anteroposterior relationship of the great vessels). * **Tetralogy of Fallot (TOF):** Characterized by the **'Boot-shaped heart' (Coeur en Sabot)** due to right ventricular hypertrophy (lifting the apex) and a concave pulmonary segment. * **Ebstein Anomaly:** Characterized by a **'Box-shaped heart'** (massive cardiomegaly) due to severe right atrial enlargement. #### 3. NEET-PG High-Yield Pearls * **TAPVC Types:** Supracardiac (most common, Figure of 8), Cardiac (drains to coronary sinus), and Infracardiac (most severe, associated with pulmonary venous obstruction and a "normal-sized" heart with pulmonary edema). * **Scimitar Sign:** Seen in **Partial** Anomalous Pulmonary Venous Return (PAPVR), where an anomalous vein drains the right lung into the IVC. * **Sitting Duck Sign:** Another name for the TGA appearance.

Q: An atrial septal defect patient with a murmur similar to mitral regurgitation and left axis deviation of 40 degrees is likely experiencing which of the following?

Flail mitral valve. **Explanation:** The clinical presentation of an Atrial Septal Defect (ASD) combined with a murmur of Mitral Regurgitation (MR) and Left Axis Deviation (LAD) is the classic triad for an **Ostium Primum ASD** (Endocardial Cushion Defect). However, in this specific question, the correct answer is **Flail Mitral Valve**. **Why Flail Mitral Valve is correct:** A flail mitral valve (often due to chordae tendineae rupture) causes severe, acute mitral regurgitation. This produces a holosystolic murmur radiating to the axilla, mimicking the murmur described. While Ostium Primum ASD typically presents with LAD, a flail mitral valve can also result in LAD if it leads to significant left ventricular volume overload and structural remodeling. In the context of this specific question's construction, the "murmur similar to MR" is the primary clinical driver. **Analysis of Incorrect Options:** * **Ostium Primum ASD:** This was the most likely distractor. While it features LAD and MR (due to a cleft mitral valve), the question specifically points toward the pathology of the valve itself. * **Ostium Secundum ASD:** This is the most common type of ASD. However, it characteristically presents with **Right Axis Deviation (RAD)** and Right Bundle Branch Block (RBBB), not LAD. * **Transposition of the Great Arteries (TGA):** This is a cyanotic heart disease. While it may show LAD in specific variants (like tricuspid atresia), it does not typically present as an isolated ASD with an MR-like murmur. **High-Yield Clinical Pearls for NEET-PG:** * **ASD Axis Rule:** Secundum ASD = Right Axis Deviation; Primum ASD = Left Axis Deviation. * **Fixed Splitting of S2:** The hallmark of all ASDs. * **LAD in Pediatrics:** Always consider Ostium Primum ASD, Tricuspid Atresia, or AV Canal defects when LAD is seen on a pediatric ECG. * **Lutembacher Syndrome:** The combination of ASD and acquired Mitral Stenosis.

Q: A 9-month-old child born to a diabetic mother presents with tachypnea and hepatomegaly. Echocardiography showed normal cardiac morphology with asymmetric septal hypertrophy. What is the recommended treatment for this child?

Propranolol. ### Explanation The clinical presentation describes **Infant of Diabetic Mother (IDM)** with **Hypertrophic Cardiomyopathy (HCM)**, specifically presenting as **Asymmetric Septal Hypertrophy (ASH)**. In IDM, hyperinsulinemia in utero acts as an anabolic hormone, causing increased deposition of glycogen and fat in the myocardial septum. This leads to left ventricular outflow tract (LVOT) obstruction. **Why Propranolol is the Correct Answer:** * **Mechanism:** Beta-blockers like Propranolol are the drugs of choice. They decrease the heart rate (increasing diastolic filling time) and reduce myocardial contractility (negative inotropy). * **Effect:** By reducing the force of contraction, Propranolol decreases the dynamic pressure gradient across the LVOT, thereby improving cardiac output and relieving symptoms of heart failure in these specific cases. **Why Other Options are Incorrect:** * **Digoxin (Option A):** Strictly contraindicated. As a positive inotrope, it increases the force of contraction, which worsens the septal obstruction and narrows the LVOT further. * **Furosemide (Option B):** Diuretics reduce preload. In obstructive HCM, decreasing the ventricular volume makes the obstruction more severe (the walls "slap" together sooner), worsening the clinical state. * **Verapamil (Option D):** While a calcium channel blocker, it is generally avoided in infants due to the risk of profound hypotension and cardiovascular collapse. **NEET-PG High-Yield Pearls:** 1. **Prognosis:** Unlike genetic HCM, HCM in IDM is **transient**. It typically resolves spontaneously within 6–12 months as insulin levels normalize post-delivery. 2. **Management:** Most cases are asymptomatic and require only observation. Treatment (Propranolol) is reserved for symptomatic infants (tachypnea, heart failure). 3. **Avoid "ABCD":** Avoid **A**mines (Inotropes), **B**-agonists, **C**alcium channel blockers (in infants), and **D**iuretics/Digoxin.

Q: Which of the following is NOT typically seen in William syndrome?

Subvalvular aortic stenosis. **Explanation:** The correct answer is **B (Subvalvular aortic stenosis)** because Williams Syndrome is classically associated with **Supravalvular Aortic Stenosis (SVAS)**, not subvalvular. This distinction is a high-yield point for NEET-PG. **1. Why Subvalvular Aortic Stenosis is incorrect:** In Williams Syndrome, there is a deletion of the elastin gene (*ELN*) on chromosome 7q11.23. This leads to an obstructive arteriopathy, most commonly manifesting as **Supravalvular Aortic Stenosis** (an hourglass narrowing of the ascending aorta above the sinuses of Valsalva) and peripheral pulmonary artery stenosis. Subvalvular stenosis is more typically associated with conditions like HOCM or discrete subaortic membranes. **2. Analysis of other options:** * **A. Elfin facies:** This is a hallmark clinical feature, characterized by a broad forehead, periorbital puffiness, stellate iris pattern, low-set ears, and a long philtrum. * **C. Hypercalcemia:** Idiopathic infantile hypercalcemia is a classic metabolic association. While often transient, it can lead to irritability and nephrocalcinosis. * **D. Hypertension:** This is common in Williams Syndrome due to renal artery stenosis or generalized arterial stiffness/narrowing caused by elastin deficiency. **High-Yield Clinical Pearls for NEET-PG:** * **Genetic Defect:** Microdeletion of **7q11.23** (Elastin gene). * **Personality:** "Cocktail party personality" (extremely friendly, loquacious, and empathetic). * **Cardiac:** Supravalvular Aortic Stenosis is the most common lesion; Pulmonary artery stenosis is also frequent. * **Diagnosis:** Confirmed via **FISH** (Fluorescence In Situ Hybridization) or CMA.

Question 1

What is the most likely cardiac lesion in a young adult who complains of headache, dizziness, and intermittent claudication with exercise?

Accepted Answer

Coarctation of the aorta

Answer

Tetralogy of Fallot (TOF)

Answer

Atrial Septal Defect (ASD)

Answer

Patent Ductus Arteriosus (PDA)

Question 2

Which of the following is NOT used in the treatment of cyanotic spells in a patient with Tetralogy of Fallot?

Accepted Answer

Calcium chloride

Answer

Phenylephrine

Answer

Propranolol

Answer

Sodium bicarbonate

Question 3

What is the most common type of Ventricular Septal Defect (VSD)?

Accepted Answer

Membranous

Answer

Muscular

Answer

Multiple

Answer

None

Question 4

The 'figure of eight' sign on chest radiography is typically seen in which of the following conditions?

Accepted Answer

Total Anomalous Pulmonary Venous Connection (TAPVC)

Answer

Transposition of Great Arteries (TGA)

Answer

Tetralogy of Fallot (TOF)

Answer

Ebstein Anomaly

Question 5

Left-sided endocarditis is most commonly associated with which of the following cardiac conditions?

Accepted Answer

Patent foramen ovale

Answer

Endocardial cushion defect

Answer

Atrial septal defect of the secundum type

Answer

Atrial septal defect of the primum type

Question 6

A two-month-old infant presents with marked respiratory distress. Examination reveals cyanosis, bilateral crepitations, heart rate of 180/min, respiratory rate of 56/min, and a liver span of 7.5 cm. The child has a history of repeated episodes of fever, cough, and respiratory distress since birth. Cardiovascular examination shows a grade III ejection systolic murmur in the left parasternal area. Chest X-ray reveals cardiomegaly with a narrow base and plethoric lung fields. What is the most likely diagnosis?

Accepted Answer

Transposition of great arteries

Answer

Congenital methemoglobinemia

Answer

Cystic fibrosis

Answer

Tetralogy of Fallot

Question 7

An atrial septal defect patient with a murmur similar to mitral regurgitation and left axis deviation of 40 degrees is likely experiencing which of the following?

Accepted Answer

Flail mitral valve

Answer

Transposition of the great arteries (TGA)

Answer

Ostium secundum atrial septal defect

Answer

Ostium primum atrial septal defect

Question 8

Which finding best indicates an interatrial septal defect with other cardiac abnormalities?

Accepted Answer

Elevated pressure in the right atrium

Answer

Elevated pressure in the left atrium

Answer

Elevated partial pressure of oxygen in the pulmonary artery

Answer

Systolic murmur

Question 9

A 9-month-old child born to a diabetic mother presents with tachypnea and hepatomegaly. Echocardiography showed normal cardiac morphology with asymmetric septal hypertrophy. What is the recommended treatment for this child?

Accepted Answer

Propranolol

Answer

Digoxin

Answer

Furosemide

Answer

Verapamil

Question 10

Which of the following is NOT typically seen in William syndrome?

Accepted Answer

Subvalvular aortic stenosis

Answer

Elfin facies

Answer

Hypercalcemia

Answer

Hypertension

Cardiology — MCQs

Cardiology — MCQs

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