Gastroenterology Practice Questions

Q: Which of the following laboratory findings is most specific for acute pancreatitis in children?

Lipase. **Explanation:** **Lipase (Option C)** is the most specific and sensitive biochemical marker for acute pancreatitis in children. While both amylase and lipase are released from damaged pancreatic acinar cells, lipase is preferred because it remains elevated for a longer duration (up to 8–14 days) and is not produced by as many extrapancreatic tissues as amylase. In pediatric patients, a serum lipase level ≥3 times the upper limit of normal is a key diagnostic criterion according to the NASPGHAN guidelines. **Incorrect Options:** * **Amylase (Option A):** Though commonly used, it lacks specificity. It can be elevated in mumps (parotitis), intestinal perforation, or macroamylasemia. In children, amylase levels may also be normal in the early stages of pancreatitis. * **Tryptase (Option B):** This is a marker of mast cell degranulation and is used primarily in the diagnosis of anaphylaxis or mastocytosis, not pancreatitis. * **Chymotrypsin (Option D):** While a pancreatic enzyme, fecal chymotrypsin is used to assess pancreatic exocrine *insufficiency* (e.g., in Cystic Fibrosis) rather than acute inflammation. **High-Yield Clinical Pearls for NEET-PG:** * **Diagnosis:** Requires 2 of 3 criteria: (1) Characteristic abdominal pain, (2) Serum lipase or amylase ≥3x normal, (3) Imaging findings (USG/CT) suggestive of pancreatitis. * **Etiology in Children:** Unlike adults (alcohol/gallstones), the most common causes in children are **trauma** (e.g., bicycle handlebar injury), **infections** (Mumps, Coxsackie), and **systemic diseases** (HUS, SLE). * **Imaging:** Ultrasonography is the initial investigation of choice in children to avoid radiation.

Q: What is the major clinical manifestation of Wilson disease in children aged 8-16 years?

Hepatic dysfunction. ### Explanation **Wilson Disease (Hepatolenticular Degeneration)** is an autosomal recessive disorder caused by a mutation in the **ATP7B gene** on chromosome 13. This leads to impaired biliary copper excretion and deficient incorporation of copper into ceruloplasmin, resulting in toxic copper accumulation in various organs. **Why Hepatic Dysfunction is Correct:** The clinical presentation of Wilson disease follows a distinct age-related pattern. In children and adolescents (typically aged **8–16 years**), the **liver** is the primary site of copper accumulation and injury. Manifestations range from asymptomatic hepatomegaly and elevated transaminases to chronic hepatitis, cirrhosis, or life-threatening fulminant hepatic failure. Neuropsychiatric symptoms usually appear later, typically in the late teens or early 20s. **Why Other Options are Incorrect:** * **B. Cardiac Failure:** While copper can deposit in the heart (cardiomyopathy), it is an extremely rare clinical presentation and never the "major" manifestation. * **C. Thromboembolic Event:** Wilson disease is not a prothrombotic state. In fact, advanced liver disease often leads to coagulopathy and bleeding tendencies. * **D. Blindness:** While **Kayser-Fleischer (KF) rings** (copper deposition in Descemet’s membrane) are a hallmark, they do not cause visual impairment or blindness. Sunflower cataracts may occur but also rarely affect vision significantly. **High-Yield Clinical Pearls for NEET-PG:** * **Best Initial Screening Test:** Serum Ceruloplasmin (decreased; 250 μg/g dry weight). * **Kayser-Fleischer Rings:** Present in 99% of patients with neurological symptoms but only ~50-60% of those with isolated hepatic Wilson disease. * **Treatment:** Chelating agents like **D-Penicillamine** (first-line) or Trientine; Zinc is used for maintenance or asymptomatic patients.

Q: Which of the following is NOT seen in pyloric stenosis?

Bilious vomiting. **Explanation:** Infantile Hypertrophic Pyloric Stenosis (IHPS) is characterized by hypertrophy of the pyloric sphincter, leading to a functional gastric outlet obstruction. 1. **Why Bilious Vomiting is NOT seen:** The obstruction in IHPS occurs at the **pylorus**, which is proximal to the Ampulla of Vater (where bile enters the duodenum). Therefore, the vomitus contains gastric contents only and is **non-bilious**. Bilious vomiting always indicates an obstruction distal to the second part of the duodenum (e.g., malrotation or duodenal atresia). 2. **Analysis of Incorrect Options:** * **Projectile Vomiting:** This is the hallmark clinical feature. As the stomach attempts to force contents through the narrowed pyloric canal, the resulting pressure leads to forceful, "projectile" vomiting, usually occurring after feeds. * **Metabolic Alkalosis:** Persistent vomiting leads to the loss of gastric hydrochloric acid (HCl). The loss of H+ ions results in **hypochloremic, hypokalemic metabolic alkalosis**. * **Paradoxical Aciduria:** In an attempt to conserve sodium and volume, the kidneys eventually exchange H+ ions for Na+ in the distal tubule (due to profound depletion of K+ and Cl-). This results in acidic urine despite systemic alkalosis, a classic finding in late-stage IHPS. **High-Yield Clinical Pearls for NEET-PG:** * **Age of presentation:** Typically 3–6 weeks of life. * **Physical Exam:** A palpable, **olive-sized mass** in the epigastrium and visible gastric peristalsis. * **Diagnosis:** Ultrasound is the investigation of choice (Pyloric muscle thickness >4mm or length >14mm). * **Barium Swallow Sign:** "String sign" or "Beak sign." * **Management:** Initial priority is correction of dehydration and electrolyte imbalance, followed by **Ramstedt’s Pyloromyotomy**.

Q: What is the recommended daily dose of zinc for infants aged 8 months?

20 mg/day for 14 days. ### Explanation The correct answer is **D. 20 mg/day for 14 days.** **Underlying Medical Concept** Zinc is an essential micronutrient for protein synthesis, cell growth, and immune function. In the management of pediatric diarrhea, the World Health Organization (WHO) and UNICEF recommend zinc supplementation because it reduces the duration and severity of the episode and prevents future episodes for up to 2–3 months. The dosage is strictly age-dependent: * **Infants < 6 months:** 10 mg elemental zinc per day for 14 days. * **Children ≥ 6 months:** 20 mg elemental zinc per day for 14 days. Since the infant in the question is **8 months old**, the correct dose is 20 mg for a full 14-day course. **Analysis of Incorrect Options** * **Option A & C (10 mg/day):** This is the sub-therapeutic dose for an 8-month-old; it is only indicated for infants younger than 6 months. * **Option B (10 days):** While clinical improvement often occurs within a few days, a 10-day course is insufficient to fully replenish body stores and provide the protective effect against subsequent diarrheal episodes. The standard protocol requires 14 days. **High-Yield Clinical Pearls for NEET-PG** * **Mechanism:** Zinc restores mucosal integrity and increases levels of brush border enzymes. * **Formulation:** Zinc sulfate, gluconate, or acetate are commonly used; they should be given between meals for better absorption (though often given with food to reduce gastric irritation). * **Impact on Mortality:** Zinc supplementation, alongside ORS, can reduce diarrhea-related mortality by up to 40%. * **ORS vs. Zinc:** While ORS treats dehydration, Zinc is the only "treatment" that reduces the duration of the disease itself.

Q: Congenital hypertrophic pyloric stenosis is characterized by progressive gastric outlet obstruction. Its incidence is highest in which demographic group?

Firstborn male infant. **Explanation:** **Congenital Hypertrophic Pyloric Stenosis (CHPS)** is a condition characterized by hypertrophy and hyperplasia of the circular muscle layers of the pylorus, leading to a functional gastric outlet obstruction. **Why Option B is Correct:** Epidemiological studies consistently show a strong predilection for **firstborn male infants**. The male-to-female ratio is approximately **4:1 to 5:1**. While the exact etiology is multifactorial (involving genetic predisposition and environmental triggers like erythromycin exposure), the "firstborn male" association is a classic, high-yield demographic hallmark of the disease. **Why Other Options are Incorrect:** * **Options A & D (Females):** CHPS is significantly less common in females. However, it is noted that if a female is affected, she carries a higher genetic load, increasing the risk of CHPS in her future offspring (Carter’s Effect). * **Option C (Second male):** While subsequent male siblings are at a higher risk than the general population (due to genetic factors), the highest statistical incidence remains with the firstborn child. **Clinical Pearls for NEET-PG:** * **Clinical Presentation:** Non-bilious, projectile vomiting typically appearing between **3 to 6 weeks** of life. * **Physical Exam:** A palpable, olive-sized mass in the epigastrium (pathognomonic) and visible gastric peristalsis. * **Metabolic Abnormality:** **Hypochloremic, hypokalemic metabolic alkalosis** with paradoxical aciduria (due to loss of HCl from vomiting). * **Diagnosis:** Ultrasound is the gold standard (Pyloric muscle thickness >4mm or length >14mm). * **Management:** Initial stabilization with IV fluids (Normal Saline) followed by **Ramstedt’s Pyloromyotomy**.

Q: A child presents with cholestatic jaundice and an ejection systolic murmur heard in the pulmonary area. What syndrome is the child most likely suffering from?

Alagille syndrome. **Explanation:** The child is most likely suffering from **Alagille Syndrome** (also known as Syndromic Bile Duct Paucity). This is an autosomal dominant multisystem disorder caused by mutations in the **JAG1 gene** (Notch signaling pathway). **Why Alagille Syndrome is Correct:** The clinical hallmark is the combination of **cholestatic jaundice** (due to paucity of intrahepatic bile ducts) and **cardiac defects**. The most common cardiac lesion is **Peripheral Pulmonary Artery Stenosis**, which typically presents as an ejection systolic murmur in the pulmonary area. Other classic features include "butterfly vertebrae" (hemivertebrae), posterior embryotoxon in the eye, and characteristic "triangular facies" (prominent forehead, deep-set eyes, and pointed chin). **Why Other Options are Incorrect:** * **Crouzon Syndrome:** A craniosynostosis syndrome characterized by premature fusion of skull bones, proptosis, and midface hypoplasia. It does not typically involve cholestasis or pulmonary stenosis. * **Williams Syndrome:** While it involves cardiac issues (classically **Supravalvular Aortic Stenosis**) and "elfin facies," it is associated with hypercalcemia, not cholestatic jaundice. * **Smith-Lemli-Opitz Syndrome:** A defect in cholesterol synthesis presenting with microcephaly, intellectual disability, and syndactyly of the 2nd and 3rd toes. It is not a primary cause of neonatal cholestasis with pulmonary murmurs. **High-Yield NEET-PG Pearls:** * **Inheritance:** Autosomal Dominant (JAG1/NOTCH2 mutation). * **Liver Biopsy:** Shows a decreased ratio of bile ducts to portal tracts (<0.4). * **Classic Pentad:** Cholestasis, Cardiac defects (PPS), Skeletal anomalies (Butterfly vertebrae), Ocular findings (Posterior embryotoxon), and Characteristic Facies. * **Cardiac:** Peripheral Pulmonary Stenosis is more common than Tetralogy of Fallot in these patients.

Q: Convulsions in a child with dehydration and vomiting can only be due to:

Decreased serum sodium. **Explanation:** In a child presenting with dehydration and vomiting, electrolyte imbalances are common. The occurrence of **convulsions** is most characteristically associated with **Hyponatremia (Decreased serum sodium)**. **1. Why Hyponatremia is the correct answer:** Sodium is the primary extracellular osmolite. When serum sodium levels drop rapidly (often due to loss of sodium in vomitus/diarrhea or replacement with hypotonic fluids), an osmotic gradient is created. Water moves from the extracellular space into the brain cells (intracellular space) to equalize osmolality, leading to **cerebral edema**. This increased intracranial pressure and neuronal swelling trigger seizures. **2. Why the other options are incorrect:** * **Decreased serum magnesium (Hypomagnesemia):** While it can cause seizures, it is rarely the primary consequence of simple dehydration and vomiting; it is more common in malabsorption syndromes or specific renal losses. * **Decreased serum potassium (Hypokalemia):** This is very common in vomiting/dehydration, but it typically manifests as **muscle weakness, paralytic ileus, and ECG changes** (U waves), not convulsions. * **Decreased serum chloride (Hypochloremia):** This leads to metabolic alkalosis (contraction alkalosis), which may cause tetany due to decreased ionized calcium, but it is not a direct cause of seizures. **Clinical Pearls for NEET-PG:** * **Hyponatremic Dehydration:** Defined as Serum $Na^+ < 130$ mEq/L. It is the most dangerous form of dehydration because of the risk of seizures. * **Hypernatremic Dehydration:** Can also cause seizures, but these occur due to **cerebral shrinkage** and subarachnoid hemorrhage rather than edema. * **Management Tip:** Rapid correction of chronic hyponatremia can lead to **Central Pontine Myelinolysis**, whereas rapid correction of hypernatremia can lead to **Cerebral Edema**.

Q: Fecal soiling in children is most commonly due to?

Chronic constipation. ### Explanation **Correct Answer: B. Chronic constipation** **Mechanism of Fecal Soiling (Encopresis):** The most common cause of fecal soiling in children is **functional chronic constipation** (accounting for >90% of cases). When a child chronically withholds stool, the rectum becomes distended, leading to a "megarectum." Over time, the rectal wall loses its sensitivity and contractile strength. Eventually, liquid or semi-formed stool from higher up in the colon leaks around the hard, impacted fecal mass and escapes through the anal sphincter involuntarily. This is known as **overflow incontinence** or encopresis. **Why other options are incorrect:** * **A. Hirschsprung's Disease:** While this involves severe constipation, fecal soiling is **extremely rare** in Hirschsprung’s. This is because the aganglionic segment (usually the distal rectum) remains tonically contracted, preventing the passage of even liquid stool. The absence of soiling is a key clinical feature used to differentiate Hirschsprung’s from functional constipation. * **C. Rectal Atresia:** This is a structural congenital anomaly presenting in the neonatal period with intestinal obstruction. It does not typically present as chronic soiling in an older child. **Clinical Pearls for NEET-PG:** * **Functional Constipation:** Usually starts after 2 years of age (often during toilet training); fecal soiling is common; dilated rectum filled with stool on PR exam. * **Hirschsprung’s Disease:** Usually presents in the neonatal period (delayed passage of meconium >48 hours); empty rectum on PR exam; "blast sign" (explosive release of gas/stool) upon finger withdrawal. * **Gold Standard Diagnosis for Hirschsprung’s:** Rectal suction biopsy (showing absence of ganglion cells and hypertrophied nerve bundles).

Question 1

Which of the following laboratory findings is most specific for acute pancreatitis in children?

Accepted Answer

Lipase

Answer

Amylase

Answer

Tryptase

Answer

Chymotrypsin

Question 2

A 3-month-old child presents with a one-month history of clay-colored stools and dark yellow urine. Initial management included steroids and ursodeoxycholic acid. Further investigation revealed a direct bilirubin level of 6 mg%. Which of the following investigations is most sensitive for diagnosing this condition?

Accepted Answer

Hepatobiliary Iminodiacetic Acid (HIDA) scan

Answer

Ultrasound

Answer

Liver function tests

Answer

CT abdomen

Question 3

What is the major clinical manifestation of Wilson disease in children aged 8-16 years?

Accepted Answer

Hepatic dysfunction

Answer

Cardiac failure

Answer

Thromboembolic event

Answer

Blindness

Question 4

A 12-month-old male child suddenly draws up his legs and screams with pain, which is repeated periodically throughout the night, interspersed with periods of quiet sleep. When seen after 12 hours, the child looks pale, has vomited, and passed thin, blood-stained stool. There is a mass around the umbilicus. What is the most likely diagnosis?

Accepted Answer

Intussusception

Answer

Appendicitis

Answer

Gastroenteritis

Answer

Roundworm obstruction

Question 5

Which of the following is NOT seen in pyloric stenosis?

Accepted Answer

Bilious vomiting

Answer

Projectile vomiting

Answer

Paradoxical aciduria

Answer

Metabolic alkalosis

Question 6

What is the recommended daily dose of zinc for infants aged 8 months?

Accepted Answer

20 mg/day for 14 days

Answer

10 mg/day for 10 days

Answer

20 mg/day for 10 days

Answer

10 mg/day for 14 days

Question 7

Congenital hypertrophic pyloric stenosis is characterized by progressive gastric outlet obstruction. Its incidence is highest in which demographic group?

Accepted Answer

Firstborn male infant

Answer

Firstborn female infant

Answer

Second male infant

Answer

Second female infant

Question 8

A child presents with cholestatic jaundice and an ejection systolic murmur heard in the pulmonary area. What syndrome is the child most likely suffering from?

Accepted Answer

Alagille syndrome

Answer

Crouzon syndrome

Answer

William syndrome

Answer

Smith Lemli Opitz syndrome

Question 9

Convulsions in a child with dehydration and vomiting can only be due to:

Accepted Answer

Decreased serum sodium

Answer

Decreased serum magnesium

Answer

Decreased serum potassium

Answer

Decreased serum chloride

Question 10

Fecal soiling in children is most commonly due to?

Accepted Answer

Chronic constipation

Answer

Hirschsprung's disease

Answer

Rectal atresia

Answer

None of the above

Gastroenterology — MCQs

Gastroenterology — MCQs

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