Cardiology Practice Questions

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

Tricuspid atresia. **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.

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

Tricuspid atresia. **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.

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

Murmur presents early in the course of disease.. **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).

Q: A 9-month-old infant accidentally ingests an unknown quantity of digitalis. What is the most important noncardiac manifestation of toxicity in this infant?

Vomiting. **Explanation:** **Digitalis (Digoxin) toxicity** is a high-yield topic in pediatric cardiology. In infants and children, the clinical presentation differs slightly from adults, making it crucial to distinguish between cardiac and noncardiac signs. **1. Why Vomiting is the Correct Answer:** **Vomiting** is the most common and often the earliest **noncardiac** manifestation of digitalis toxicity in infants. It occurs due to the direct stimulation of the **Chemoreceptor Trigger Zone (CTZ)** in the area postrema of the medulla. Other common gastrointestinal symptoms include nausea and anorexia. In an infant, poor feeding is a frequent surrogate for these symptoms. **2. Analysis of Incorrect Options:** * **Fever (A):** Digitalis toxicity does not typically cause fever. It is more likely to cause neurological or gastrointestinal symptoms. * **Dizziness (B):** While dizziness can occur in older children or adults, it is difficult to assess in a 9-month-old infant and is not the primary diagnostic sign. * **Visual disturbances (D):** Classic "yellow-green halos" (xanthopsia) are a hallmark of digoxin toxicity in **adults**. However, these are nearly impossible to document in infants and are rarely the presenting feature in this age group. **3. High-Yield Clinical Pearls for NEET-PG:** * **Most Common Cardiac Manifestation:** In children, the most common cardiac sign is **sinus bradycardia** or **prolonged PR interval**. In adults, ventricular ectopy is more common. * **Electrolyte Interaction:** **Hypokalemia**, hypomagnesemia, and hypercalcemia predispose a patient to digoxin toxicity. * **ECG Changes:** Look for the "reverse tick" or "scooped" ST-segment depression (Digoxin effect). * **Management:** The definitive treatment for severe toxicity (arrhythmias or hyperkalemia) is **Digoxin-specific Fab fragments (Digibind).**

Q: A cyanotic newborn is suspected of having congenital heart disease. The newborn has an increased left ventricular impulse and a holosystolic murmur along the left sternal border. The ECG shows left-axis deviation and left ventricular hypertrophy (LVH). Which of the following is the most likely diagnosis?

Tricuspid atresia. **Explanation:** The clinical presentation of a cyanotic newborn with **Left Axis Deviation (LAD)** and **Left Ventricular Hypertrophy (LVH)** on ECG is a classic "spotter" for **Tricuspid Atresia**. **Why Tricuspid Atresia is correct:** In Tricuspid Atresia, there is no communication between the right atrium and right ventricle. Systemic venous return must pass through an ASD/PFO to the left atrium and then into a dominant left ventricle. This leads to: 1. **LVH:** The left ventricle handles both systemic and pulmonary venous return. 2. **LAD:** Due to the hypoplastic right ventricle and structural conduction changes, the QRS axis shifts to the left (usually -30° to -90°). 3. **Holosystolic Murmur:** Usually represents a VSD, which is necessary for blood to reach the pulmonary circulation. **Why other options are incorrect:** * **Transposition of the Great Arteries (TGA):** Typically presents with Right Axis Deviation (RAD) and RVH. The "egg-on-a-string" appearance is seen on X-ray. * **Truncus Arteriosus:** Usually presents with increased pulmonary blood flow and biventricular hypertrophy, but the axis is typically normal or rightward. * **Tetralogy of Fallot (TOF):** The most common cyanotic heart disease, but it characteristically shows **RAD and RVH** due to right ventricular outflow obstruction and a boot-shaped heart. **High-Yield Clinical Pearls for NEET-PG:** * **Cyanotic Heart Disease + LAD =** Tricuspid Atresia (most common) or AV Canal Defect. * **ECG in Cyanotic Newborns:** Most cyanotic lesions (TOF, TGA, TAPVC) cause RAD/RVH because the right heart is under pressure. Tricuspid Atresia is the notable exception. * **X-ray finding:** Tricuspid atresia often shows a "wall-to-wall" heart or decreased pulmonary vascular markings.

Q: A 12-year-old girl presents with short stature, webbed neck, and widely spaced nipples, suggestive of a chromosomal abnormality confirmed by karyotyping. What is the most likely cardiovascular anomaly to be present in this child?

Coarctation of the aorta. **Explanation:** The clinical presentation of short stature, webbed neck, and widely spaced nipples in a female child is classic for **Turner Syndrome (45, XO)**. In Turner Syndrome, cardiovascular anomalies are present in approximately 30–50% of patients. **Why Coarctation of the aorta is correct:** The most common cardiovascular malformation in Turner Syndrome is a **Bicuspid Aortic Valve (BAV)**, occurring in about 30% of cases. However, among the options provided, **Coarctation of the Aorta (CoA)** is the hallmark association, occurring in 10–15% of patients. It typically presents as a pre-ductal or juxta-ductal narrowing. The underlying pathophysiology involves lymphatic obstruction during fetal development, which alters hemodynamics in the developing aorta. **Why other options are incorrect:** * **Atrial Septal Defect (ASD):** While common in the general population and certain syndromes like Down Syndrome (specifically ostium primum), it is not the primary association for Turner Syndrome. * **Tetralogy of Fallot (TOF):** This is the most common cyanotic heart disease but is characteristically associated with **DiGeorge Syndrome** (22q11 deletion), not Turner Syndrome. * **Patent Ductus Arteriosus (PDA):** This is most strongly associated with **Congenital Rubella Syndrome** and prematurity. **High-Yield Pearls for NEET-PG:** * **Most common cardiac anomaly in Turner Syndrome:** Bicuspid Aortic Valve (BAV). * **Most common "obstructive" lesion in Turner Syndrome:** Coarctation of the Aorta. * **Karyotype:** 45, XO is the most common, but mosaicism (45,X/46,XX) can occur. * **Other associations:** Horseshoe kidney, streak ovaries (primary amenorrhea), and increased risk of aortic dissection later in life.

Q: Which of the following statements regarding rheumatic nodules is false?

Tender on palpation. In Acute Rheumatic Fever (ARF), **Subcutaneous Nodules** are a major Jones criterion. The hallmark characteristic of these nodules is that they are **painless (non-tender)** and mobile. Therefore, the statement that they are "tender on palpation" is false. ### Explanation of Options: * **Option B (Correct):** Rheumatic nodules are characteristically **painless**. Tenderness is typically absent, which helps clinically distinguish them from other inflammatory nodules like Erythema Nodosum (which are very painful and usually located on the shins). * **Option A:** They are typically found over **extensor surfaces** of joints (elbows, knees, wrists), the occiput, or the spinous processes of the vertebrae. * **Option C:** There is a very strong clinical correlation between subcutaneous nodules and **severe carditis**. They rarely occur as an isolated finding and usually appear weeks after the onset of fever. * **Option D:** They are described as firm, symmetric, and small (ranging from a few millimeters to 2 cm), often likened to the size of a **pea**. ### High-Yield Clinical Pearls for NEET-PG: * **Jones Criteria:** Subcutaneous nodules are a **Major Criterion** but are the least common (occurring in <1–5% of cases). * **Histology:** They show a central zone of fibrinoid necrosis surrounded by histiocytes and fibroblasts (similar to Aschoff bodies but in extra-cardiac tissue). * **Duration:** They are transient, usually lasting 1–2 weeks, and do not leave permanent scars. * **Differential:** Unlike Rheumatoid nodules, Rheumatic nodules are smaller and shorter-lived.

Q: Of the following vasculitides, coronary artery aneurysms are most often seen in which condition?

Kawasaki disease. **Explanation:** **Kawasaki Disease (KD)** is the correct answer because it is a systemic, medium-vessel vasculitis that has a unique predilection for the coronary arteries. It is the leading cause of acquired heart disease in children in developed nations. The underlying pathophysiology involves transmural inflammation of the coronary arteries, leading to the destruction of the muscular-elastic fiber layers, which results in **coronary artery aneurysms (CAAs)** in approximately 20–25% of untreated cases. **Analysis of Incorrect Options:** * **Giant Cell Arteritis:** A large-vessel vasculitis that typically affects the branches of the external carotid artery (e.g., temporal artery) in patients over 50. It rarely involves the coronary arteries. * **Wegener’s Granulomatosis (GPA):** A small-vessel vasculitis characterized by granulomatous inflammation of the respiratory tract and glomerulonephritis. While it can cause carditis, CAAs are not a hallmark feature. * **Leukocytoclastic Vasculitis:** A small-vessel vasculitis (hypersensitivity vasculitis) that primarily affects the skin, presenting as palpable purpura. It does not involve medium-sized muscular arteries like the coronaries. **NEET-PG High-Yield Pearls:** * **Diagnostic Criteria (CRASH and Burn):** **C**onjunctivitis (non-purulent), **R**ash (polymorphous), **A**denopathy (cervical, usually unilateral), **S**trawberry tongue (and oral mucosal changes), **H**ands/feet (edema/desquamation), and **Burn** (High-grade fever for ≥5 days). * **Treatment:** High-dose IVIG (2g/kg) and Aspirin. IVIG is most effective when given within the first 10 days to prevent CAAs. * **Investigation of Choice:** Echocardiography is used to screen for and monitor coronary artery involvement.

Q: Which statement is true about Erythema Marginatum in acute rheumatic fever?

It is usually associated with carditis.. **Explanation:** **Erythema Marginatum** is one of the five **Major Jones Criteria** for the diagnosis of Acute Rheumatic Fever (ARF). 1. **Why Option D is Correct:** Erythema marginatum is highly specific for ARF and is **strongly associated with carditis**. It often appears simultaneously with or shortly after the onset of cardiac involvement. While it occurs in less than 5% of ARF patients, its presence is a significant clinical indicator of underlying rheumatic heart disease. 2. **Why Other Options are Incorrect:** * **Option A:** The rash is characteristically **non-pruritic** (not itchy) and painless. It is an evanescent, pink, ring-like eruption with clear centers and "serpiginous" (snake-like) borders. * **Option B:** It primarily involves the **trunk and proximal extremities**. Crucially, it **spares the face**, which helps differentiate it from other pediatric rashes. * **Option C:** It is actually an **uncommon** manifestation, occurring in <5% of cases. Polyarthritis and Carditis are much more frequent presentations. **High-Yield Clinical Pearls for NEET-PG:** * **Nature:** It is a "transient" or "evanescent" rash; it can appear and disappear within hours and is often brought out by heat (e.g., a warm bath). * **Jones Criteria Mnemonic (Major):** **JO**ints (Polyarthritis), **♥** (Carditis), **N**odules (Subcutaneous), **E**rythema marginatum, **S**ydenham chorea. * **Differential Diagnosis:** Do not confuse it with *Erythema Chronicum Migrans* (Lyme disease) or *Erythema Multiforme* (Target lesions).

Question 1

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

Accepted Answer

Tricuspid atresia

Answer

Ventricular septal defect (VSD)

Answer

Pulmonary atresia

Answer

Atrial septal defect (ASD)

Question 2

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

Accepted Answer

Tricuspid atresia

Answer

Coarctation of Aorta

Answer

Ebstein's anomaly

Answer

Transposition of great arteries

Question 3

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

Accepted Answer

Murmur presents early in the course of disease.

Answer

Pulmonary plethora leads to pulmonary hypertension.

Answer

Flow murmur is present, leading to a mid-diastolic murmur.

Answer

Shunt murmur is absent.

Question 4

Which of the following is the most common sustained tachyarrhythmia in children?

Accepted Answer

Supraventricular tachycardia

Answer

Ventricular tachycardia

Answer

Atrial flutter

Answer

Atrial fibrillation

Question 5

A 9-month-old infant accidentally ingests an unknown quantity of digitalis. What is the most important noncardiac manifestation of toxicity in this infant?

Accepted Answer

Vomiting

Answer

Fever

Answer

Dizziness

Answer

Visual disturbances

Question 6

A cyanotic newborn is suspected of having congenital heart disease. The newborn has an increased left ventricular impulse and a holosystolic murmur along the left sternal border. The ECG shows left-axis deviation and left ventricular hypertrophy (LVH). Which of the following is the most likely diagnosis?

Accepted Answer

Tricuspid atresia

Answer

Transposition of the great arteries

Answer

Truncus arteriosus

Answer

Tetralogy of Fallot

Question 7

A 12-year-old girl presents with short stature, webbed neck, and widely spaced nipples, suggestive of a chromosomal abnormality confirmed by karyotyping. What is the most likely cardiovascular anomaly to be present in this child?

Accepted Answer

Coarctation of the aorta

Answer

Atrial septal defect

Answer

Tetralogy of Fallot

Answer

Patent ductus arteriosus

Question 8

Which of the following statements regarding rheumatic nodules is false?

Accepted Answer

Tender on palpation

Answer

Found over extensor surfaces

Answer

Associated with carditis

Answer

Pea-sized nodules

Question 9

Of the following vasculitides, coronary artery aneurysms are most often seen in which condition?

Accepted Answer

Kawasaki disease

Answer

Giant cell arteritis

Answer

Wegener's granulomatosis

Answer

Leukocytoclastic vasculitis

Question 10

Which statement is true about Erythema Marginatum in acute rheumatic fever?

Accepted Answer

It is usually associated with carditis.

Answer

It is pruritic.

Answer

It commonly involves the face.

Answer

It is a common manifestation of acute rheumatic fever.

Cardiology — MCQs

Cardiology — MCQs

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