Cardiology — MCQs

Cardiology Indian Medical PG Practice Questions and MCQs

Question 251: All of the following statements regarding total anomalous pulmonary venous connection are true EXCEPT?

A. The total pulmonary venous blood reaches the right atrium.
B. It is always associated with a VSD. (Correct Answer)
C. The oxygen saturation of the blood in the pulmonary artery is higher than that in the aorta.
D. The infracardiac type is always obstructive.

Explanation: In **Total Anomalous Pulmonary Venous Connection (TAPVC)**, all four pulmonary veins fail to connect to the left atrium and instead drain into the systemic venous circulation or the right atrium. ### **Explanation of Options** * **Option B (Correct Answer):** TAPVC is **not** associated with a Ventricular Septal Defect (VSD) by definition. Instead, it is **obligatorily associated with an Atrial Septal Defect (ASD)** or a patent foramen ovale. Since all pulmonary and systemic blood returns to the right heart, an interatrial communication is essential for survival to allow blood to reach the left side of the heart and the systemic circulation. * **Option A:** This is true. Whether the drainage is supracardiac (via the vertical vein), cardiac (via the coronary sinus), or infracardiac, the entire pulmonary venous return eventually reaches the **Right Atrium**. * **Option C:** This is true. In TAPVC, there is complete mixing of blood in the right atrium. However, because the pulmonary blood flow is usually much higher than systemic flow, the **oxygen saturation in the Pulmonary Artery is often higher than in the Aorta** (where saturation is limited by the mixing and the right-to-left shunt across the ASD). * **Option D:** This is true. **Infracardiac (Type III) TAPVC** is almost always obstructive because the pulmonary veins must pass through the diaphragm (esophageal hiatus) and often drain into the portal system, which offers high resistance. ### **High-Yield Clinical Pearls for NEET-PG** * **Chest X-ray:** Look for the **"Figure of 8"** or **"Snowman sign"** in Supracardiac TAPVC. * **Infracardiac TAPVC:** Presents early (first days of life) with severe respiratory distress and cyanosis; the heart size is typically normal on X-ray (unlike other types). * **Hemodynamics:** It is a **cyanotic congenital heart disease** with **increased pulmonary blood flow**.

Question 252: Two weeks after birth, a baby has persistent tachypnea, tachycardia, diaphoresis, and cyanosis. Workup reveals a patent ductus arteriosus. This can be closed with the use of?

A. Indomethacin (Correct Answer)
B. Acetaminophen
C. Aspirin
D. Cyclosporine

Explanation: **Explanation:** The patency of the Ductus Arteriosus (DA) in utero is maintained by high levels of circulating **Prostaglandin E2 (PGE2)**, which acts as a vasodilator. After birth, oxygen levels rise and prostaglandin levels fall, leading to functional closure. If the DA remains patent (PDA), it causes a left-to-right shunt, leading to symptoms of heart failure as described in the vignette. **1. Why Indomethacin is correct:** Indomethacin is a potent, non-selective **Cyclooxygenase (COX) inhibitor**. By inhibiting the COX enzyme, it blocks the synthesis of prostaglandins. The reduction in PGE2 levels promotes the constriction and subsequent anatomical closure of the ductus arteriosus. **2. Analysis of Incorrect Options:** * **Acetaminophen:** While recent studies suggest intravenous paracetamol can be used to close a PDA with fewer gastrointestinal side effects than NSAIDs, **Indomethacin (or Ibuprofen)** remains the classic, first-line pharmacological standard taught for NEET-PG. * **Aspirin:** Although it is a COX inhibitor, it is not used in neonates due to the risk of **Reye’s Syndrome** and its less predictable efficacy in ductal closure compared to Indomethacin. * **Cyclosporine:** This is an immunosuppressant (calcineurin inhibitor) used in organ transplants and has no role in prostaglandin inhibition or ductal closure. **High-Yield Clinical Pearls for NEET-PG:** * **Drug of Choice:** IV Indomethacin or IV Ibuprofen are the drugs of choice for PDA closure in preterm infants. * **Contraindications:** Do not use NSAIDs if the infant has necrotizing enterocolitis (NEC), renal failure, or active bleeding. * **Keeping it Open:** If a "duct-dependent" cyanotic heart disease is present (e.g., Transposition of Great Arteries), **Alprostadil (PGE1 infusion)** is used to keep the ductus *open*. * **Murmur:** PDA is characterized by a "machinery-type" continuous murmur heard best at the left infraclavicular area.

Question 253: All of the following conditions are associated with a systolic thrill in the left 2nd and 3rd intercostal space, EXCEPT:

A. Pink Tetralogy of Fallot (Correct Answer)
B. Subpulmonic Ventricular Septal Defect
C. Pulmonic stenosis
D. Ebstein's anomaly

Explanation: **Explanation:** A systolic thrill in the **left 2nd and 3rd intercostal spaces (upper left sternal border)** typically indicates high-velocity turbulent flow across the **pulmonary valve** or the **right ventricular outflow tract (RVOT)**. **1. Why Pink Tetralogy of Fallot (TOF) is the Correct Answer:** In TOF, the primary cause of the systolic murmur is **infundibular (pulmonic) stenosis**. However, the intensity of the murmur and the presence of a thrill are inversely proportional to the severity of the obstruction. In "Pink TOF," the pulmonary stenosis is relatively mild, allowing for balanced pressures and minimal cyanosis. Because the RVOT obstruction is not severe enough to create the extreme turbulence required to produce a palpable thrill at the upper left sternal border, it is the least likely among the options to present this way. **2. Analysis of Other Options:** * **Subpulmonic VSD:** Also known as supracristal VSD, the defect is located just below the pulmonary valve. The shunting of blood occurs directly into the RVOT/pulmonary artery, often producing a loud systolic murmur and thrill in the 2nd left intercostal space. * **Pulmonic Stenosis:** This is the classic cause of a systolic thrill at the left 2nd intercostal space. The high-pressure gradient across the narrowed valve creates significant turbulence. * **Ebstein’s Anomaly:** While often associated with a "quiet" heart, severe cases with associated functional or anatomical pulmonary atresia/stenosis or massive tricuspid regurgitation can occasionally produce thrills. However, in the context of this specific question, Pink TOF is the most definitive "except" because the murmur in TOF originates from the stenosis, not the VSD, and mild stenosis (Pink TOF) rarely produces a thrill. **Clinical Pearls for NEET-PG:** * **VSD Thrill:** Usually felt at the **lower** left sternal border (3rd/4th ICS). * **AS/PS Thrill:** Felt at the **upper** sternal border (2nd ICS); AS on the right, PS on the left. * **TOF Murmur:** The murmur in TOF is due to **Pulmonary Stenosis**, NOT the VSD (the VSD in TOF is large and non-restrictive, making it silent). * **Rule of Thumb:** A thrill corresponds to a murmur intensity of **Grade 4/6** or higher on the Levine scale.

Question 254: Regarding Kawasaki disease, all of the following are true, EXCEPT:

A. Mucocutaneous lesions
B. Coronary artery is involved
C. Seen in children
D. Suppurative lymphadenopathy (Correct Answer)

Explanation: **Explanation:** Kawasaki Disease (KD) is an acute, febrile, multi-systemic medium-vessel vasculitis that primarily affects children. The diagnosis is clinical, based on the presence of high-grade fever for at least 5 days along with specific diagnostic criteria. **Why "Suppurative lymphadenopathy" is the correct answer:** Cervical lymphadenopathy is a classic diagnostic criterion for Kawasaki disease; however, it is characteristically **non-suppurative** (dry). It is usually unilateral, involves the anterior cervical chain, and measures >1.5 cm. The presence of pus or fluctuance (suppuration) should lead a clinician to consider alternative diagnoses like bacterial lymphadenitis. **Analysis of Incorrect Options:** * **A. Mucocutaneous lesions:** These are hallmark features. They include "strawberry tongue," cracked red lips, oropharyngeal erythema, and a polymorphic skin rash. * **B. Coronary artery is involved:** KD is the leading cause of acquired heart disease in children in developed nations. Coronary artery aneurysms (CAA) occur in 20–25% of untreated cases, typically appearing in the subacute phase. * **C. Seen in children:** Approximately 80–90% of cases occur in children under the age of 5. It is rare in adults. **High-Yield NEET-PG Pearls:** * **Treatment:** The gold standard is **IVIG (2g/kg)** plus **High-dose Aspirin**. This reduces the risk of coronary aneurysms to <5%. * **Cardiac Complication:** Myocarditis is common in the acute phase; Coronary Aneurysms are the most serious long-term complication. * **Incomplete Kawasaki:** Suspect this in infants with prolonged fever who do not meet all 4/5 clinical criteria but have elevated inflammatory markers (ESR/CRP). * **BCG Site Reactivity:** Erythema or crusting at a prior BCG vaccination site is a highly specific clinical sign for KD.

Question 255: All of the following statements about Kawasaki disease are true, EXCEPT:

A. Intravenous immunoglobulin is the treatment of choice.
B. The prognosis is generally good with appropriate treatment.
C. Thrombocytopenia is a common finding. (Correct Answer)
D. Elevated ESR is a characteristic laboratory finding.

Explanation: **Explanation:** Kawasaki Disease (KD) is an acute, self-limiting systemic medium-vessel vasculitis. The correct answer is **C** because Kawasaki disease is typically characterized by **thrombocytosis** (elevated platelet count), not thrombocytopenia. 1. **Why Option C is the correct answer (The Exception):** In KD, the platelet count begins to rise during the subacute phase (usually in the second week of illness), often reaching levels >4.5 lakh/mm³ and sometimes exceeding 10 lakh/mm³. This reactive thrombocytosis is a hallmark of the disease and increases the risk of coronary artery thrombosis. Thrombocytopenia is rare and, if present, usually indicates a complication like Macrophage Activation Syndrome (MAS) or severe disseminated intravascular coagulation (DIC). 2. **Why other options are incorrect:** * **Option A:** IVIG (2 g/kg) is indeed the treatment of choice. When administered within the first 10 days of fever, it significantly reduces the risk of coronary artery aneurysms from 25% to <5%. * **Option B:** With timely IVIG and aspirin therapy, the prognosis is excellent for most children, with complete resolution of symptoms and prevention of long-term cardiac sequelae. * **Option D:** KD is a systemic inflammatory state; therefore, elevated acute phase reactants like ESR and CRP are characteristic and almost always present during the acute phase. **High-Yield Clinical Pearls for NEET-PG:** * **Diagnosis:** Clinical diagnosis based on fever (≥5 days) + 4 out of 5 criteria (Conjunctivitis, Rash, Edema/Erythema of hands/feet, Adenopathy, Mucosal changes - "CREAM"). * **Cardiac Complication:** Coronary artery aneurysms are the most serious complication; Echo should be done at diagnosis, 2 weeks, and 6-8 weeks. * **Aspirin Paradox:** KD is one of the few pediatric conditions where high-dose Aspirin is used despite the risk of Reye’s syndrome. * **Incomplete KD:** Suspect in infants with prolonged fever even if they don't meet all criteria.

Question 256: All of the following are characteristic of the classic tetralogy of Fallot except?

A. Large ventricular septal defect (VSD)
B. Aorta that overrides the VSD
C. Severe right ventricle outflow obstruction
D. Left ventricular hypertrophy (Correct Answer)

Explanation: **Explanation:** Tetralogy of Fallot (TOF) is the most common cyanotic congenital heart disease. It is characterized by a single developmental defect: the **anterior and cephalad deviation of the infundibular (conal) septum**. This malalignment leads to the four classic anatomical features. **Why Option D is the Correct Answer:** In TOF, the right ventricle (RV) faces high pressure because it must pump against a stenosed pulmonary valve and the systemic pressure of the aorta (via the VSD). This leads to **Right Ventricular Hypertrophy (RVH)**, not left. The left ventricle typically remains normal in size or may even be slightly smaller due to reduced pulmonary venous return. Therefore, **Left Ventricular Hypertrophy** is not a feature of TOF. **Analysis of Incorrect Options:** * **A. Large VSD:** A non-restrictive malalignment VSD is a core component, allowing equalized pressures between the two ventricles. * **B. Overriding Aorta:** Due to the displaced septum, the aortic root is shifted to the right, "straddling" the VSD and receiving blood from both ventricles. * **C. RV Outflow Obstruction (RVOTO):** This is usually infundibular (subvalvular) stenosis, though it can be valvular or supravalvular. The severity of cyanosis in TOF is directly proportional to the degree of RVOTO. **NEET-PG High-Yield Pearls:** * **X-ray Finding:** "Boot-shaped heart" (*Coeur en sabot*) due to an upturned apex (from RVH) and a concave pulmonary segment. * **Clinical Sign:** "Tet Spells" (hypoxic spells) occur due to an acute increase in right-to-left shunting. Management includes the **knee-chest position** (to increase systemic vascular resistance). * **Murmur:** The murmur in TOF is due to **pulmonary stenosis**, not the VSD. A softer murmur indicates a more severe obstruction (less flow). * **ECG:** Characteristically shows **Right Axis Deviation** and RVH.

Question 257: Which of the following is a true statement about Coarctation of the Aorta?

A. Lower limb pulses are barely palpable or absent. (Correct Answer)
B. Blood pressure is elevated proximal to the lesion and reduced distal to it.
C. The condition is twice as common in males as females.
D. Hypertrophy of the lower ribs may be seen in older children.

Explanation: **Explanation:** Coarctation of the Aorta (CoA) is a congenital narrowing of the aortic lumen, typically occurring near the insertion of the ductus arteriosus. **1. Why Option A is Correct:** The hallmark clinical finding of CoA is a **significant pressure gradient** between the upper and lower extremities. Because the narrowing obstructs blood flow to the descending aorta, the femoral, popliteal, and dorsalis pedis pulses are characteristically weak, delayed (**radio-femoral delay**), or entirely absent. **2. Analysis of Incorrect Options:** * **Option B:** While the statement about blood pressure is physiologically true, Option A is the "most" characteristic clinical sign used for bedside diagnosis. However, in many standardized exams, if multiple statements are factually correct, the most definitive clinical sign is prioritized. *Note: In some contexts, B is also true, but A is the classic physical exam finding.* * **Option C:** CoA is actually **two to five times more common in males** than in females. However, it is famously associated with **Turner Syndrome (45, XO)** in females. * **Option D:** The radiological sign is **rib notching** (Roesler’s sign), which is **erosion/atrophy** of the inferior aspect of the 3rd to 8th ribs due to pressure from dilated collateral intercostal arteries, not hypertrophy. **High-Yield Clinical Pearls for NEET-PG:** * **Associated Conditions:** Bicuspid aortic valve (most common, ~70%), Turner Syndrome, and Berry aneurysms (Circle of Willis). * **Chest X-ray:** Look for the **"Figure of 3" sign** (pre- and post-stenotic dilatation) and rib notching (usually seen after age 5). * **Physical Exam:** Systolic murmur best heard at the **left infrascapular area**. * **Treatment:** Prostaglandin E1 in neonates to keep the ductus open; balloon angioplasty or surgical resection for definitive repair.

Question 258: What is a common cause of cyanosis?

A. Tetralogy of Fallot (Correct Answer)
B. Patent Ductus Arteriosus
C. Tricuspid Atresia
D. Eisenmenger's Complex

Explanation: **Explanation:** Cyanosis in pediatrics is primarily categorized into cyanotic and acyanotic congenital heart diseases (CHDs). **Why Tetralogy of Fallot (TOF) is the correct answer:** TOF is the **most common cyanotic heart disease** presenting after the neonatal period. It consists of four components: Pulmonary stenosis (the primary determinant of severity), Right Ventricular Hypertrophy, Overriding of the Aorta, and a large VSD. The obstruction to right ventricular outflow causes deoxygenated blood to shunt right-to-left through the VSD into the systemic circulation, leading to clinical cyanosis. **Analysis of Incorrect Options:** * **B. Patent Ductus Arteriosus (PDA):** This is an **acyanotic** CHD characterized by a left-to-right shunt. Cyanosis only occurs if reversal of the shunt (Eisenmenger syndrome) develops much later in life. * **C. Tricuspid Atresia:** While this is a cyanotic CHD, it is significantly **less common** than TOF. It presents early in the neonatal period and is characterized by a "left axis deviation" on ECG, unlike the right axis deviation seen in TOF. * **D. Eisenmenger’s Complex:** This refers to the reversal of a long-standing left-to-right shunt (like VSD) due to pulmonary hypertension. While it causes cyanosis, it is a **late complication** rather than a primary common cause in the pediatric age group. **High-Yield Clinical Pearls for NEET-PG:** * **X-ray finding in TOF:** "Boot-shaped heart" (Coeur en sabot) due to an upturned apex (RVH) and concave pulmonary segment. * **Tet Spells:** Hypercyanotic episodes managed with knee-chest positioning, oxygen, and morphine. * **Most common cyanotic CHD at birth:** Transposition of the Great Arteries (TGA). * **Most common cyanotic CHD overall (after infancy):** Tetralogy of Fallot.

Question 259: A newborn presents with deepening cyanosis at birth, with congestive heart failure and a normal first heart sound. X-ray reveals cardiomegaly. What is the diagnosis?

A. Tetralogy of Fallot
B. Ebstein anomaly
C. Transposition of great vessels (Correct Answer)
D. Tricuspid atresia

Explanation: **Explanation:** **Transposition of the Great Arteries (TGA)** is the most common cause of cyanotic heart disease presenting in the immediate neonatal period. In TGA, the aorta arises from the right ventricle and the pulmonary artery from the left ventricle, creating two parallel circulations. 1. **Why TGA is correct:** * **Cyanosis:** Deepening cyanosis occurs as the Ductus Arteriosus closes. * **Congestive Heart Failure (CHF):** Unlike many other cyanotic defects, TGA often presents with early CHF due to increased pulmonary blood flow and volume overload. * **X-ray:** Characteristically shows **cardiomegaly** with a narrow mediastinum (the "Egg-on-a-string" appearance). * **Heart Sounds:** S1 is usually normal; S2 is often single and loud because the aorta is anterior. 2. **Why other options are incorrect:** * **Tetralogy of Fallot (TOF):** Typically presents later (not at birth) and features a **boot-shaped heart** with *decreased* pulmonary blood flow (no cardiomegaly or CHF). * **Ebstein Anomaly:** While it causes massive cardiomegaly, it is associated with a "box-shaped" heart and multiple clicks/split sounds, not a normal S1. * **Tricuspid Atresia:** Usually presents with a **left axis deviation** on ECG and a "horizontal" or "boot-shaped" heart, but rarely presents with significant cardiomegaly and CHF simultaneously at birth. **High-Yield Clinical Pearls for NEET-PG:** * **Egg-on-a-string appearance:** Classic radiological sign for TGA. * **Medical Management:** Infusion of **PGE1 (Alprostadil)** is life-saving to keep the ductus arteriosus patent. * **Surgical Procedure:** The treatment of choice is the **Arterial Switch Operation (Jatene Procedure)**, ideally performed within the first 2 weeks of life. * **Rashkind Procedure:** Balloon atrial septostomy used as a palliative measure to improve mixing.

Question 260: A 5-month-old pale and lethargic male infant presents to the emergency department. On examination, heart rate is 240 bpm and does not change with crying. Lungs are clear and there is no hepatomegaly. An ECG is provided. Which of the following is the first step in the management of this patient?

A. Rapid verapamil infusion
B. Transthoracic pacing of the heart
C. Carotid sinus massage (Correct Answer)
D. Direct current cardioversion

Explanation: ***Carotid sinus massage*** - **Vagal maneuvers** are the first-line treatment for stable **supraventricular tachycardia (SVT)** in infants, with carotid sinus massage being effective and safe. - The **fixed heart rate of 240 bpm** that doesn't change with crying is pathognomonic of **SVT** in infants, making vagal stimulation the appropriate initial intervention. *Rapid verapamil infusion* - **Verapamil is absolutely contraindicated** in infants under 1 year of age due to risk of severe **hypotension** and **cardiac arrest**. - Can cause **profound myocardial depression** and **cardiovascular collapse** in young infants with immature cardiac conduction systems. *Transthoracic pacing of the heart* - Pacing is used for **bradyarrhythmias** and **heart blocks**, not for treating **tachyarrhythmias** like SVT. - Would be inappropriate and potentially dangerous as it could **increase the heart rate** further in an already tachycardic patient. *Direct current cardioversion* - Reserved for **unstable SVT** with signs of **hemodynamic compromise** or when vagal maneuvers and **adenosine fail**. - This infant appears **stable** (clear lungs, no hepatomegaly), making less invasive vagal maneuvers the preferred first step.

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Infective Endocarditis

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Myocarditis and Cardiomyopathies

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Arrhythmias in Children

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Heart Failure in Children

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Pulmonary Hypertension

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Systemic Hypertension

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Cardiology — MCQs

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