Cardiology — MCQs

Cardiology Indian Medical PG Practice Questions and MCQs

Question 101: All of the following may occur in Noonan's syndrome, EXCEPT:

A. Hypertrophic cardiomyopathy
B. Cryptorchidism
C. Pulmonary stenosis (Correct Answer)
D. Autosomal dominant transmission

Explanation: **Explanation:** The question asks for the exception among features of **Noonan Syndrome**. The correct answer is **C (Pulmonary Stenosis)** because the question phrasing implies it *does not* occur, which is a common trap in medical exams. In reality, Pulmonary Stenosis is the **most common** cardiac lesion in Noonan Syndrome. However, in the context of "Except" questions in NEET-PG, if all options are technically true features, the question often hinges on identifying the most characteristic vs. least characteristic trait, or it may be a "recall-error" in the question stem where the student must identify that all options are actually associated with the syndrome. *Note: In standard clinical teaching, all four options (A, B, C, and D) are classic features of Noonan Syndrome. If forced to choose an "exception" in a flawed question, one must look for nuances, but medically, all are correct.* **Breakdown of Options:** * **Pulmonary Stenosis (Option C):** This is the hallmark cardiac finding (seen in ~50-60% of cases), specifically **Dysplastic Pulmonary Valve**. * **Hypertrophic Cardiomyopathy (Option A):** Occurs in approximately 20% of patients and is a major cause of morbidity. * **Cryptorchidism (Option B):** Very common in males with Noonan syndrome, often leading to fertility issues later in life. * **Autosomal Dominant (Option D):** It is an AD condition, most commonly due to mutations in the **PTPN11 gene** (RASopathy). **Clinical Pearls for NEET-PG:** * **"Male Turner Syndrome":** Noonan is often called this due to phenotypic similarities (webbed neck, short stature, cubitus valgus), but it occurs in both sexes and has a **normal karyotype** (46, XY or 46, XX). * **Cardiac Contrast:** Turner Syndrome is associated with **Bicuspid Aortic Valve/Coarctation of Aorta**, whereas Noonan is associated with **Pulmonary Stenosis/HCM**. * **Hematology:** Look for **Factor XI deficiency** or bleeding diathesis in these patients.

Question 102: A 2-year-old known case of Rheumatic Heart Disease (RHD) presents with a 3-week history of fever, hematuria, and palpitations. What is the most likely diagnosis?

A. Streptococcal endocarditis
B. Collagen vascular disease
C. Reactivation
D. Staphylococcal endocarditis (Correct Answer)

Explanation: **Explanation:** The clinical presentation of a child with pre-existing **Rheumatic Heart Disease (RHD)** presenting with a prolonged fever (3 weeks), hematuria (suggestive of embolic phenomena or glomerulonephritis), and palpitations strongly points towards **Infective Endocarditis (IE)**. 1. **Why Staphylococcal endocarditis is correct:** While *Viridans group Streptococci* are common causes of subacute IE, **Staphylococcus aureus** is the most common cause of acute and subacute infective endocarditis worldwide, especially in children with underlying structural heart disease like RHD. The presence of hematuria indicates systemic embolization or immune-complex mediated damage, which are classic peripheral stigmata of IE. 2. **Why other options are incorrect:** * **Streptococcal endocarditis:** Though a frequent cause, *S. aureus* has overtaken it in many clinical settings as the primary pathogen. In the context of NEET-PG, if a specific organism must be chosen for IE in a damaged valve, *Staphylococcus* is often the preferred answer unless "Viridans" is specified for a post-dental procedure scenario. * **Collagen vascular disease:** While conditions like SLE can cause fever and hematuria (lupus nephritis), they do not typically present as a complication of known RHD. * **Reactivation:** Acute Rheumatic Fever (ARF) reactivation would present with Jones criteria (migratory polyarthritis, carditis, chorea). While fever and palpitations occur, hematuria is not a feature of ARF; it is a hallmark of IE. **Clinical Pearls for NEET-PG:** * **Most common cause of IE (Overall):** *Staphylococcus aureus*. * **Most common cause of IE (Subacute/Native Valve):** *Streptococcus viridans*. * **Duke’s Criteria:** Used for diagnosis (2 Major, 1 Major + 3 Minor, or 5 Minor). * **Classic Signs:** Roth spots (retina), Osler nodes (painful, fingers), Janeway lesions (painless, palms/soles), and Splinter hemorrhages.

Question 103: In children, which of the following congenital heart diseases presents with absence of sinus arrhythmia?

A. Fallot's tetralogy
B. Patent Ductus Arteriosus (PDA)
C. Atrial Septal Defect (ASD) (Correct Answer)
D. Ebstein's anomaly

Explanation: **Explanation:** **1. Why Atrial Septal Defect (ASD) is the correct answer:** Sinus arrhythmia is a normal physiological phenomenon where the heart rate increases during inspiration and decreases during expiration. This occurs because inspiration increases venous return to the right atrium, momentarily increasing the heart rate. In **Atrial Septal Defect (ASD)**, there is a continuous left-to-right shunt. During inspiration, the increase in systemic venous return is offset by a reciprocal decrease in the left-to-right shunt across the ASD. Conversely, during expiration, the systemic venous return decreases, but the left-to-right shunt increases. This "balancing act" keeps the total diastolic filling of the right ventricle constant throughout the respiratory cycle. Consequently, the respiratory variation in heart rate is lost, leading to the **absence of sinus arrhythmia**. **2. Why other options are incorrect:** * **Fallot’s Tetralogy (TOF):** This is a cyanotic heart disease characterized by right ventricular outflow obstruction. It does not equalize atrial pressures or volumes in a way that abolishes sinus arrhythmia. * **Patent Ductus Arteriosus (PDA):** This involves a shunt between the aorta and pulmonary artery (extracardiac). It does not interfere with the normal respiratory-related fluctuations in right atrial filling. * **Ebstein’s Anomaly:** While this involves the right atrium (atrialization of the RV), it does not feature the specific shunting mechanism that stabilizes right-sided volumes across the respiratory cycle. **3. High-Yield Clinical Pearls for NEET-PG:** * **ASD Hallmark:** Fixed, wide splitting of the Second Heart Sound ($S_2$). * **The "Fixed" Split:** Just as sinus arrhythmia is absent because right-sided volume remains constant, the $S_2$ split remains "fixed" because the pulmonary valve closure delay does not change with respiration. * **Murmur in ASD:** The murmur heard is a **midsystolic flow murmur** over the pulmonary area (due to increased flow across the pulmonary valve), NOT the shunt itself.

Question 104: Sustained severe hypertension in children is most commonly suggestive of:

A. Coarctation of aorta
B. Pheochromocytoma
C. Renal parenchymal disease (Correct Answer)
D. Drug induced hypertension

Explanation: **Explanation:** In the pediatric population, the etiology of hypertension is predominantly **secondary** (identifiable cause), unlike in adults where primary (essential) hypertension is more common. **Why Renal Parenchymal Disease is correct:** Renal diseases are the **most common cause of secondary hypertension** in children, accounting for approximately 70-80% of cases. **Renal parenchymal diseases** (such as Glomerulonephritis, Reflux Nephropathy, and Polycystic Kidney Disease) lead to sustained severe hypertension through mechanisms involving sodium retention, volume expansion, and activation of the Renin-Angiotensin-Aldosterone System (RAAS). **Analysis of Incorrect Options:** * **Coarctation of Aorta:** While a classic cause of upper extremity hypertension in children, it is less common than renal causes. It should be suspected if there is a significant BP differential between upper and lower limbs or diminished femoral pulses. * **Pheochromocytoma:** This is a rare catecholamine-secreting tumor in children. While it causes severe hypertension, it is often paroxysmal (episodic) rather than sustained and represents a very small fraction of pediatric cases. * **Drug-induced Hypertension:** Certain drugs (steroids, sympathomimetics, or ADHD medications) can elevate BP, but these are transient and secondary to external intake rather than a primary disease process. **High-Yield Clinical Pearls for NEET-PG:** * **Rule of Thumb:** The younger the child and the higher the blood pressure, the more likely it is to be a secondary cause. * **Most common cause overall (Pediatrics):** Renal Parenchymal Disease. * **Most common renovascular cause:** Fibromuscular Dysplasia (FMD) or Takayasu Arteritis (in older children). * **Initial Investigation:** Urinalysis, BUN/Creatinine, and Renal Ultrasound are the first-line steps in evaluating pediatric hypertension.

Question 105: What percentage of patients with Down's syndrome have congenital cardiovascular disease?

A. 10%
B. 30%
C. 50% (Correct Answer)
D. 70%

Explanation: **Explanation:** **1. Understanding the Correct Answer (C - 50%):** Down’s syndrome (Trisomy 21) is the most common chromosomal disorder associated with congenital heart disease (CHD). Epidemiological studies and standard pediatric textbooks (like Nelson) establish that approximately **40% to 50%** of newborns with Down’s syndrome have a cardiac malformation. The high prevalence is attributed to the overexpression of genes on chromosome 21 that influence endocardial cushion development during embryogenesis. **2. Analysis of Incorrect Options:** * **A (10%) & B (30%):** These figures significantly underestimate the prevalence. While 10-30% might represent the prevalence in other chromosomal anomalies (like Turner syndrome, which is ~25-30%), it is too low for Down’s syndrome. * **D (70%):** While the association is strong, 70% is an overestimation. However, it is important to note that if a patient with Down’s syndrome has CHD, the complexity is often high, requiring early surgical intervention. **3. High-Yield Clinical Pearls for NEET-PG:** * **Most Common Lesion:** The **Atrioventricular Septal Defect (AVSD)**, specifically the canal type, is the most common CHD in Down’s syndrome (approx. 45% of their cardiac cases). * **Second Most Common:** Ventricular Septal Defect (VSD) is the second most frequent. * **Clinical Management:** All infants diagnosed with Down’s syndrome must undergo a screening **Echocardiogram** regardless of clinical findings, as murmurs may not be audible in the neonatal period due to high pulmonary vascular resistance. * **Eisenmenger Syndrome:** Patients with Down’s syndrome and large left-to-right shunts (like AVSD) tend to develop pulmonary hypertension much earlier than non-syndromic children.

Question 106: NADA's criteria are used for which assessment in a child?

A. Degree of dehydration
B. Degree of malnutrition
C. Presence of heart disease (Correct Answer)
D. Degree of mental retardation

Explanation: **Explanation:** **NADA’s Criteria** is a clinical screening tool used for the **diagnosis of heart disease in children**. Developed by Alexander Nadas, it relies on physical examination findings to differentiate between innocent murmurs and pathological cardiac conditions. The criteria are divided into **Major** and **Minor** categories: * **Major Criteria:** Systolic murmur (Grade III or higher), Diastolic murmur, Cyanosis, and Congestive Heart Failure. * **Minor Criteria:** Systolic murmur (less than Grade III), Abnormal S2, Abnormal ECG, and Abnormal Chest X-ray (cardiomegaly or pulmonary vascularity changes). * **Diagnosis:** Heart disease is suspected if there is **one major** or **two minor** criteria present. **Why other options are incorrect:** * **Degree of dehydration:** Assessed using the **WHO classification** (No, Some, or Severe dehydration) based on skin pinch, thirst, and mental status. * **Degree of malnutrition:** Assessed using the **IAP (Indian Academy of Pediatrics) classification** (based on weight-for-age) or **Gomez/Waterlow classifications**. * **Degree of mental retardation:** Assessed using **IQ (Intelligence Quotient) scores** (e.g., Binet-Kamat or Wechsler scales) and the DSM-5/ICD-11 severity levels. **Clinical Pearls for NEET-PG:** * **Jones Criteria:** Used for the diagnosis of Acute Rheumatic Fever. * **Duke Criteria:** Used for the diagnosis of Infective Endocarditis. * **Ross Classification:** Used to assess the severity of Heart Failure in infants. * **High-Yield Fact:** NADA’s criteria are particularly useful in primary care settings to decide which child needs a referral for an Echocardiogram.

Question 107: What is true about Ventricular Septal Defect (VSD)?

A. Second heart sound (S2) is loud.
B. A diastolic murmur is heard.
C. Third heart sound (S3) is left-sided. (Correct Answer)
D. The split of the second heart sound (S2) is wide and fixed.

Explanation: **Explanation:** Ventricular Septal Defect (VSD) is the most common congenital heart disease. It is characterized by a left-to-right shunt, leading to increased pulmonary blood flow and subsequent volume overload of the left heart chambers. **Why Option C is correct:** In a large VSD, the increased pulmonary venous return leads to **volume overload of the Left Atrium (LA) and Left Ventricle (LV)**. During the rapid filling phase of diastole, this excessive volume hitting the dilated LV wall produces a **left-sided S3**. Additionally, the high flow across the mitral valve often produces a mid-diastolic flow murmur at the apex. **Analysis of Incorrect Options:** * **Option A:** The intensity of S2 depends on pulmonary artery pressure. In a simple VSD, S2 is typically normal. It becomes loud (specifically the P2 component) only if **Pulmonary Arterial Hypertension (PAH)** or Eisenmenger syndrome develops. * **Option B:** While a mid-diastolic flow murmur can occur (as mentioned above), the *characteristic* murmur of VSD is a **pansystolic murmur** heard best at the left lower sternal border. A primary diastolic murmur is not a defining feature of VSD itself. * **Option D:** A **wide, fixed split of S2** is the hallmark of an **Atrial Septal Defect (ASD)**, not VSD. In VSD, the split is usually wide but remains **variable** (moves with respiration) because the LV takes longer to empty, delaying A2. **Clinical Pearls for NEET-PG:** * **Small VSD (Roger’s Disease):** Loud, harsh murmur but clinically asymptomatic. * **Large VSD:** Leads to heart failure, frequent chest infections, and Eisenmenger syndrome (reversal of shunt). * **Murmur Intensity:** The smaller the hole, the louder the murmur (due to higher turbulence). * **Closing:** Small muscular VSDs have the highest rate of spontaneous closure.

Question 108: True about acute rheumatic fever is?

A. Aortic valve is most commonly involved.
B. Chorea is a late manifestation. (Correct Answer)
C. Carditis is the most common presentation.
D. All patients have a history of recurrent episodes of streptococcal pharyngitis.

Explanation: **Explanation:** Acute Rheumatic Fever (ARF) is a multisystem inflammatory disease following a Group A Beta-hemolytic Streptococcal (GABHS) pharyngitis. **1. Why Option B is Correct:** Sydenham’s Chorea (St. Vitus' Dance) is characterized by involuntary, purposeless movements and emotional lability. It has a **long latent period** (1–6 months) after the initial streptococcal infection. While other Jones criteria (like arthritis) appear early, chorea often manifests when other clinical signs have subsided, making it a **late manifestation**. **2. Why Other Options are Incorrect:** * **Option A:** The **Mitral valve** is the most commonly involved valve (isolated mitral regurgitation is the classic early finding), followed by the Aortic valve. * **Option C:** **Migratory Polyarthritis** is the most common clinical presentation (seen in ~75% of cases), whereas Carditis is the most serious manifestation (seen in ~40–60%). * **Option D:** ARF follows a **single episode** of untreated or inadequately treated GABHS pharyngitis in susceptible individuals; a history of "recurrent" episodes is not a prerequisite. **High-Yield Clinical Pearls for NEET-PG:** * **Jones Criteria (Revised 2015):** Diagnosis requires 2 Major OR 1 Major + 2 Minor criteria, plus evidence of preceding GAS infection (ASO titer/Anti-DNAse B). * **Arthritis:** In ARF, it is typically "Migratory" and exquisitely responsive to Salicylates/NSAIDs. * **Carditis:** It is a **Pancarditis** (Endo-, Myo-, and Pericarditis). The pathognomonic histological finding is the **Aschoff Body**. * **Subcutaneous Nodules:** These are painless, firm, and typically located over bony prominences/extensor surfaces.

Question 109: Which of the following conditions does not present with cyanosis?

A. Tetralogy of Fallot (TOF)
B. Transposition of great vessels
C. Patent ductus arteriosus (PDA) (Correct Answer)
D. Tricuspid atresia

Explanation: **Explanation:** Congenital Heart Diseases (CHDs) are broadly classified into **Cyanotic** (Right-to-Left shunt) and **Acyanotic** (Left-to-Right shunt) types. **Why PDA is the correct answer:** Patent Ductus Arteriosus (PDA) is an **Acyanotic CHD**. In a typical PDA, blood shunts from the high-pressure Aorta to the lower-pressure Pulmonary Artery (Left-to-Right). Since oxygenated blood is simply recirculating through the lungs, the systemic circulation remains oxygen-rich, and the patient does not present with cyanosis. Cyanosis in PDA only occurs if **Eisenmenger syndrome** develops (reversal of shunt), leading to "differential cyanosis." **Why the other options are incorrect:** * **Tetralogy of Fallot (TOF):** The most common cyanotic CHD after one year of age. It involves a Right-to-Left shunt across a VSD due to pulmonary stenosis. * **Transposition of the Great Vessels (TGA):** The most common cyanotic CHD presenting in the neonatal period. It creates two parallel circuits, necessitating a shunt (like an ASD or PDA) for survival. * **Tricuspid Atresia:** A cyanotic CHD where the lack of a tricuspid valve forces blood from the Right Atrium to the Left Atrium via an ASD, mixing deoxygenated and oxygenated blood. **High-Yield Clinical Pearls for NEET-PG:** * **PDA Murmur:** Characterized by a **continuous "machinery" murmur**, loudest at the left infraclavicular area. * **Drug of Choice:** **Indomethacin or Ibuprofen** (NSAIDs) are used to close a PDA in pre-term infants; **Prostaglandin E1** is used to keep it open in ductal-dependent lesions. * **The 5 T’s of Cyanotic CHD:** **T**OF, **T**GA, **T**ricuspid Atresia, **T**APVC, and **T**runcus Arteriosus. * **Differential Cyanosis:** Seen in PDA with reversal of shunt; cyanosis is present in the lower limbs but absent in the upper limbs.

Question 110: All of the following are true regarding tetralogy of Fallot except:

A. Boot shaped heart
B. Most common cyanotic heart disease
C. Clinical consequences depend on severity of subpulmonic stenosis
D. Left ventricular hypertrophy (Correct Answer)

Explanation: **Explanation:** Tetralogy of Fallot (TOF) is characterized by four classic anatomical features: **VSD, Overriding of the aorta, Right Ventricular Outflow Tract Obstruction (RVOTO), and Right Ventricular Hypertrophy (RVH).** **Why Option D is the correct answer (False statement):** In TOF, the primary hemodynamic burden is on the right side of the heart due to subpulmonic stenosis (RVOTO). This leads to **Right Ventricular Hypertrophy (RVH)**, not left. The left ventricle is typically normal in size or even small because it receives less blood flow due to the right-to-left shunt across the VSD. **Analysis of other options:** * **Option A (Boot-shaped heart):** On X-ray, the "Coeur en sabot" appearance is a classic finding. It is caused by the upturning of the cardiac apex (due to RVH) and a concave pulmonary segment (due to pulmonary hypoplasia). * **Option B (Most common cyanotic heart disease):** TOF is the most common cyanotic congenital heart disease (CCHD) presenting **after infancy**. (Note: TGA is the most common CCHD at birth). * **Option C (Severity depends on subpulmonic stenosis):** The degree of cyanosis and the clinical severity are directly proportional to the degree of RVOTO. If the stenosis is mild, it is called "Acyanotic" or "Pink Fallot." **NEET-PG High-Yield Pearls:** * **Squatting position:** Increases systemic vascular resistance (SVR), which decreases the right-to-left shunt and improves oxygenation during a "Tet spell." * **Murmur:** The murmur in TOF is due to **pulmonary stenosis**, not the VSD (the VSD is large and non-restrictive). * **Drug of choice for Tet spell:** Morphine (calms the child) and Phenylephrine (increases SVR). Beta-blockers (Propranolol) are used for long-term prevention.

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Congenital Heart Diseases: Cyanotic

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Congenital Heart Diseases: Acyanotic

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Rheumatic Heart Disease

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Kawasaki Disease

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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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Dyslipidemia in Children

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Cardiac Evaluation and Diagnostics

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Cardiology — MCQs

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