Dyslipidemia in Children — MCQs
How much decrease in LDL cholesterol and how much increase in HDL cholesterol can occur with the use of bile acid resins as anti-dyslipidemic drugs?
Which of the following is not the criteria for diagnosis of Metabolic syndrome?
Which gene defect causes familial hypercholesterolemia?
A patient has multiple tendon xanthomas. Serum cholesterol ( $398 \mathrm{mg} / \mathrm{dL}$ ) and LDL ( 220 $\mathrm{mg} / \mathrm{dL}$ ) were found to be elevated. What is the most likely defect?
What is the COMMONEST cause of death in diphtheritic child?
An 8-year-old child presents with hematuria 5 days after a throat infection. What is the most likely diagnosis?
A 5 year old child presented with periorbital swelling and oliguria. Nephrotic syndrome is suspected. Which of the following is the commonest type of nephrotic syndrome in this child?
What is the risk of congenital heart disease in a first-degree relative?
Where is the innocent murmur best heard in children?
Which of the following is FALSE about Transposition of the Great Arteries (TGA)?
Dyslipidemia in Children Indian Medical PG Practice Questions and MCQs
Question 1: How much decrease in LDL cholesterol and how much increase in HDL cholesterol can occur with the use of bile acid resins as anti-dyslipidemic drugs?
- A. 15-25% decrease in LDL-C and 3-5% increase in HDL-C (Correct Answer)
- B. 3-5% decrease in LDL-C and 1-3% increase in HDL-C
- C. 25-35% decrease in LDL-C and 1-3% increase in HDL-C
- D. 5-10% decrease in LDL-C and 1-3% increase in HDL-C
Explanation: ***Correct: 15-25% decrease in LDL-C and 3-5% increase in HDL-C***- **Bile acid resins** (cholestyramine, colestipol, colesevelam) effectively lower **LDL cholesterol by 15-25%** by sequestering bile acids in the intestine, leading to increased hepatic LDL receptor expression [1].- They produce a modest but beneficial **3-5% increase in HDL cholesterol**.- This represents the typical therapeutic effect at standard doses.*Incorrect: 3-5% decrease in LDL-C and 1-3% increase in HDL-C*- This represents a **much smaller effect** on both LDL-C and HDL-C than typically observed with therapeutic doses of bile acid resins.- Such marginal LDL-C reduction (3-5%) would be **clinically insignificant** for most dyslipidemic patients requiring treatment.*Incorrect: 25-35% decrease in LDL-C and 1-3% increase in HDL-C*- While bile acid resins can achieve significant **LDL-C reduction**, the 25-35% range is on the **higher end** of what's typically seen (more common with maximum doses or combination therapy).- The **HDL-C increase of 1-3%** is lower than the standard 3-5% increase commonly reported for this drug class.*Incorrect: 5-10% decrease in LDL-C and 1-3% increase in HDL-C*- This magnitude of **LDL-C reduction is suboptimal** for patients requiring lipid-lowering therapy with bile acid resins.- Both the LDL-C decrease and HDL-C increase are below the expected therapeutic range for this medication class.
Question 2: Which of the following is not the criteria for diagnosis of Metabolic syndrome?
- A. High LDL (Correct Answer)
- B. Hyperiglyceridemia
- C. Hypertension
- D. Central obesity
Explanation: ***High LDL*** - While **high LDL (low-density lipoprotein)** is a risk factor for cardiovascular disease [1], it is **not** one of the specific diagnostic criteria for metabolic syndrome. - The criteria for metabolic syndrome focus on a cluster of metabolic abnormalities associated with insulin resistance. *Hypertriglyceridemia* - **Elevated triglycerides** (typically ≥ 150 mg/dL or on drug treatment for elevated triglycerides) is one of the key diagnostic criteria for metabolic syndrome. - It reflects impaired lipid metabolism often associated with insulin resistance [2]. *Hypertension* - **Elevated blood pressure** (systolic ≥ 130 mmHg or diastolic ≥ 85 mmHg, or on antihypertensive drug treatment) is a core component of metabolic syndrome. - Hypertension in this context is often linked to underlying insulin resistance. *Central obesity* - **Increased waist circumference** (varying by ethnicity and sex, e.g., >102 cm in men and >88 cm in women for adults of European descent) is a primary criterion for metabolic syndrome. - It is a strong indicator of visceral fat accumulation, which is closely linked to insulin resistance [3].
Question 3: Which gene defect causes familial hypercholesterolemia?
- A. LDL Receptor (Correct Answer)
- B. Apo E
- C. Apo CII
- D. Apo B48
Explanation: ***LDL Receptor*** - Familial hypercholesterolemia (FH) is primarily caused by mutations in the **LDL receptor (LDLR) gene**, which leads to impaired clearance of **low-density lipoprotein (LDL)** from the blood. - This defect results in significantly elevated levels of **LDL cholesterol** and an increased risk of premature cardiovascular disease. *Apo E* - Mutations in the **Apo E gene** are associated with **Type III hyperlipoproteinemia (dysbetalipoproteinemia)**, characterized by elevated **chylomicron remnants** and **VLDL remnants**. - This condition presents with xanthomas and premature atherosclerosis, but is distinct from the primary defect in FH. *Apo CII* - **Apo CII** is a cofactor for **lipoprotein lipase (LPL)**, an enzyme essential for the breakdown of **triglycerides** in chylomicrons and VLDL. - Deficiency in Apo CII or LPL causes **Type I hyperlipoproteinemia (familial chylomicronemia syndrome)**, leading to marked **hypertriglyceridemia**, not hypercholesterolemia. *Apo B48* - **Apo B48** is a structural component of **chylomicrons**, which are responsible for transporting dietary fats from the intestines. - It is not directly involved in the primary defect of **LDL clearing** that characterizes familial hypercholesterolemia.
Question 4: A patient has multiple tendon xanthomas. Serum cholesterol ( $398 \mathrm{mg} / \mathrm{dL}$ ) and LDL ( 220 $\mathrm{mg} / \mathrm{dL}$ ) were found to be elevated. What is the most likely defect?
- A. Lipoprotein lipase deficiency
- B. LDL receptor defect (Correct Answer)
- C. Apo E defect
- D. LCAT deficiency
- E. Apo B-100 defect
Explanation: ***LDL receptor defect*** - **Tendon xanthomas** are a classic sign of **familial hypercholesterolemia**, which is most commonly caused by a genetic defect in the **LDL receptor**. - **Elevated LDL cholesterol** levels are a hallmark of this condition, as dysfunctional LDL receptors lead to impaired clearance of LDL particles from the blood. *Lipoprotein lipase deficiency* - This condition primarily causes severe **hypertriglyceridemia** and can lead to **eruptive xanthomas**, but not typically tendon xanthomas. - While cholesterol levels might be elevated, the defining feature would be very high triglyceride levels, often exceeding 1000 mg/dL. *Apo E defect* - A defect in **ApoE** (specifically the **ApoE2/E2 genotype**) is associated with **familial dysbetalipoproteinemia** (Type III hyperlipoproteinemia). - This condition causes elevated remnants of chylomicrons and VLDL, leading to **palmar xanthomas**, but less commonly tendon xanthomas, and often presents with high triglyceride levels in addition to cholesterol. *Apo B-100 defect* - **Familial defective apoB-100** can present similarly to familial hypercholesterolemia with elevated LDL cholesterol. - However, this is much **rarer** than LDL receptor defects (affecting ~1:700 vs 1:250-500 for LDL receptor mutations). - The clinical presentation and lipid profile overlap significantly, but LDL receptor defects remain the most common cause of this clinical picture. *LCAT deficiency* - **Lecithin-cholesterol acyltransferase (LCAT)** deficiency leads to an accumulation of **unesterified cholesterol** in plasma and tissues. - This typically presents with **corneal opacities**, **hemolytic anemia**, and proteinuria, rather than predominantly tendon xanthomas and isolated severe LDL elevation.
Question 5: What is the COMMONEST cause of death in diphtheritic child?
- A. Tonsillitis
- B. Myocarditis (Correct Answer)
- C. Septicemia
- D. IIIrd cranial nerve palsy
Explanation: ***Myocarditis*** - Myocarditis is the **MOST COMMON cause of death** in diphtheria, accounting for **40-60% of all diphtheria-related deaths**. - Diphtheria toxin causes **direct myocardial damage** leading to inflammation of the heart muscle (myocarditis). - Typically occurs in the **2nd-3rd week** of illness and can present with **cardiac arrhythmias, conduction blocks, heart failure**, and cardiogenic shock. - Clinical manifestations include tachycardia disproportionate to fever, distant heart sounds, gallop rhythm, and ECG changes. *Tonsillitis* - While tonsillitis with **pseudomembrane formation** on the tonsils is a characteristic clinical feature of diphtheria, it is not the cause of death. - The local pharyngeal infection itself does not cause mortality unless it leads to airway obstruction (which would be the second most common cause of death). - Death in diphtheria is primarily due to **systemic effects of the exotoxin**, not the local infection. *Septicemia* - Septicemia (bloodstream infection) is **not a typical feature** of diphtheria pathophysiology. - Diphtheria mortality is caused by the **exotoxin effects** on distant organs (heart, nerves, kidneys), not by bacterial invasion and sepsis. - *Corynebacterium diphtheriae* remains localized; the toxin spreads systemically. *IIIrd cranial nerve palsy* - Neurological complications including **cranial nerve palsies** occur in 10-20% of diphtheria cases due to neurotoxic effects. - IIIrd nerve palsy (ptosis, ophthalmoplegia) and palatal palsy are common neurological manifestations. - However, neurological complications **rarely cause death** and typically occur later (3-7 weeks) compared to cardiac complications.
Question 6: An 8-year-old child presents with hematuria 5 days after a throat infection. What is the most likely diagnosis?
- A. Post streptococcal nephropathy (Correct Answer)
- B. Nephrotic syndrome
- C. IgA nephropathy
- D. Alport syndrome
Explanation: ***Post streptococcal glomerulonephritis*** - **Post-streptococcal glomerulonephritis (PSGN)** is the most common cause of acute glomerulonephritis in children aged 5-12 years. - Typically presents with **hematuria 1-2 weeks (7-21 days, average 10 days)** after a streptococcal pharyngitis or 3-6 weeks after skin infection. - **5 days post-throat infection** falls within the early range of the latent period for PSGN. - Clinical features include **gross hematuria ("cola-colored" urine)**, **edema**, **hypertension**, and **low C3 complement levels**. - The time interval and clinical presentation in this 8-year-old child are classic for PSGN. *IgA nephropathy* - IgA nephropathy presents with **synpharyngitic hematuria** - occurring **within 1-2 days** (24-48 hours) of an upper respiratory infection. - The **5-day interval** in this case is too long for typical IgA nephropathy presentation. - More common in older children and young adults, and shows normal C3 complement levels. *Nephrotic syndrome* - **Nephrotic syndrome** is characterized by **massive proteinuria (>40 mg/m²/hr)**, **hypoalbuminemia (<2.5 g/dL)**, **edema**, and **hyperlipidemia**. - The primary presentation is **edema and frothy urine**, not acute gross hematuria following infection. - Hematuria, if present, is typically microscopic rather than macroscopic. *Alport syndrome* - **Alport syndrome** is a hereditary nephritis caused by **collagen type IV defects**. - Presents with **persistent microscopic hematuria** from early childhood, often with **sensorineural hearing loss** and **ocular abnormalities**. - Does not have the acute temporal relationship with throat infection seen in this case.
Question 7: A 5 year old child presented with periorbital swelling and oliguria. Nephrotic syndrome is suspected. Which of the following is the commonest type of nephrotic syndrome in this child?
- A. Focal segmental glomerulosclerosis (FSGS)
- B. Chronic glomerulonephritis
- C. Minimal change disease (Correct Answer)
- D. Congenital nephrotic syndrome
Explanation: ***Minimal change disease*** - This is the **most common cause of nephrotic syndrome** in children, accounting for approximately 80% of cases. - It presents with sudden onset of **periorbital edema**, **generalized edema**, and often **oliguria** due to severe proteinuria. *Focal segmental glomerulosclerosis (FSGS)* - While a significant cause of nephrotic syndrome in children, it ranks second to minimal change disease in frequency. - FSGS tends to have a **poorer response to steroids** and a higher risk of progression to **end-stage renal disease**. *Chronic glomerulonephritis* - This is a broad category of glomerular diseases, typically having a **more insidious onset** and often associated with hematuria and hypertension, which are not mentioned in this acute presentation. - It usually presents with features that suggest **nephritic syndrome** (e.g., hematuria, hypertension) rather than primarily nephrotic syndrome features. *Congenital nephrotic syndrome* - This is a **rare genetic condition** that presents within the first 3 months of life, which is much earlier than the 5-year-old age of this patient. - It is characterized by severe proteinuria from birth and is typically part of inherited syndromes.
Question 8: What is the risk of congenital heart disease in a first-degree relative?
- A. 0.5% to 0.6%
- B. 2% to 6% (Correct Answer)
- C. 5% to 6%
- D. 20% to 25%
Explanation: **Explanation:** The incidence of Congenital Heart Disease (CHD) in the general population is approximately **0.8% to 1%** (often cited as 8 per 1,000 live births). However, the risk increases significantly when a first-degree relative (parent or sibling) is affected. **1. Why Option B is Correct:** The inheritance of most CHDs is **multifactorial**, involving a combination of multiple genetic loci and environmental triggers. For most isolated cardiac defects, the recurrence risk for a first-degree relative is typically cited between **2% to 6%**. This represents a 3-to-5-fold increase over the baseline population risk. If two first-degree relatives are affected, the risk climbs further to approximately 10-15%. **2. Analysis of Incorrect Options:** * **Option A (0.5% to 0.6%):** This is lower than the baseline incidence in the general population (0.8-1%) and therefore incorrect. * **Option C (5% to 6%):** While 6% is the upper limit of the range, 5-6% as a standalone range is too narrow and overestimates the risk for many common lesions like VSD or PDA. * **Option D (20% to 25%):** This range is characteristic of **Autosomal Recessive** inheritance patterns. While some specific syndromes (e.g., Ellis-van Creveld) follow this, it does not apply to general CHD risk. **High-Yield Clinical Pearls for NEET-PG:** * **Left-sided obstructive lesions** (e.g., Bicuspid Aortic Valve, Hypoplastic Left Heart Syndrome) have the highest recurrence risk, sometimes reaching 10-15%. * If the **mother** has CHD, the risk to the offspring is generally higher (approx. 10-12%) compared to if the father is affected (approx. 2-3%). * **Most common CHD overall:** Ventricular Septal Defect (VSD). * **Most common CHD in Down Syndrome:** Atrioventricular Septal Defect (AVSD/Endocardial Cushion Defect).
Question 9: Where is the innocent murmur best heard in children?
- A. Pulmonic area
- B. Aortic area
- C. Left lower mid-sternal border (Correct Answer)
- D. Apex
Explanation: **Explanation:** The most common innocent murmur in children is the **Still’s Murmur**. It is a vibratory, musical, low-frequency systolic ejection murmur. It is characteristically heard best at the **left lower mid-sternal border (LLSB)** or the area between the LLSB and the apex. The sound is believed to originate from periodic vibrations of the chordae tendineae or the pulmonary valve leaflets during ventricular ejection. **Analysis of Options:** * **Left lower mid-sternal border (Correct):** This is the classic location for Still’s murmur, the most frequent innocent murmur in the pediatric population (typically ages 2–6 years). * **Pulmonic area (Incorrect):** While the *Innocent Pulmonary Ejection Murmur* is heard here, it is less common than Still’s murmur. Pathological murmurs like ASD or Pulmonary Stenosis are also localized here. * **Aortic area (Incorrect):** This area is typically associated with pathology such as Aortic Stenosis or Bicuspid Aortic Valve. * **Apex (Incorrect):** Murmurs at the apex in children often suggest Mitral Regurgitation (pathological). **Clinical Pearls for NEET-PG:** 1. **Features of Innocent Murmurs (The 7 S’s):** Sensitive (changes with position), Short (duration), Single (no clicks), Small (localized), Soft (low intensity), Sweet (musical), and Systolic. 2. **Positional Variation:** Still’s murmur is loudest in the **supine position** and decreases or disappears when the child sits or stands. 3. **Venous Hum:** Another common innocent murmur heard in the supraclavicular space; it is continuous and disappears when the child lies flat or when the jugular vein is compressed.
Question 10: Which of the following is FALSE about Transposition of the Great Arteries (TGA)?
- A. Cyanosis at birth
- B. Congestive Heart Failure (CHF)
- C. Ventricular Septal Defect (VSD)
- D. Aortic Stenosis (AS) (Correct Answer)
Explanation: **Explanation:** Transposition of the Great Arteries (TGA) is a cyanotic congenital heart disease where the aorta arises from the right ventricle and the pulmonary artery arises from the left ventricle, creating two parallel, independent circulations. **Why Aortic Stenosis (AS) is the correct answer (FALSE statement):** Aortic Stenosis is not a characteristic feature or a common association of TGA. In TGA, the primary hemodynamic issue is the transposition itself. While **Pulmonary Stenosis (PS)** is a frequent association (occurring in about 25% of cases and often protecting the lungs from over-circulation), Aortic Stenosis is not part of the typical clinical spectrum of TGA. **Analysis of Incorrect Options:** * **A. Cyanosis at birth:** This is the hallmark of TGA. It is the most common cause of "cyanosis at birth" or within the first 24 hours of life. Since the circulations are parallel, oxygenated blood does not reach the systemic circulation unless there is a shunt. * **B. Congestive Heart Failure (CHF):** CHF is common in TGA, especially when a large VSD is present. The high-pressure right ventricle must pump against systemic resistance, and increased pulmonary blood flow leads to volume overload. * **C. Ventricular Septal Defect (VSD):** Approximately 30-40% of TGA cases are associated with a VSD. A VSD actually improves mixing between the two circuits, often delaying the severity of initial cyanosis but increasing the risk of early CHF. **High-Yield Clinical Pearls for NEET-PG:** * **X-ray Finding:** "Egg-on-a-string" appearance (due to a narrow mediastinum and globular heart). * **Management:** Immediate administration of **PGE1** to keep the Ductus Arteriosus open; **Rashkind’s Procedure** (Balloon Atrial Septostomy) for emergency mixing. * **Definitive Surgery:** **Jatene Procedure** (Arterial Switch Operation), ideally performed within the first 2 weeks of life.
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