Gastroenterology Practice Questions

Q: A 5-day-old term male neonate presents with delayed passage of meconium, abdominal distension, and bilious vomiting. What is the diagnosis?

Congenital aganglionic megacolon. **Explanation:** The clinical triad of **delayed passage of meconium** (>48 hours), **abdominal distension**, and **bilious vomiting** in a neonate is a classic presentation of **Congenital Aganglionic Megacolon (Hirschsprung Disease)**. **Why Option A is Correct:** Hirschsprung disease is caused by the failure of neural crest cells to migrate cranio-caudally, resulting in an **absence of ganglion cells** (Auerbach’s and Meissner’s plexuses) in the distal colon. This leads to a functional obstruction because the aganglionic segment cannot relax, causing proximal bowel dilatation. It is the most common cause of lower intestinal obstruction in neonates. **Why Other Options are Incorrect:** * **B. Hypertrophic Pyloric Stenosis:** Typically presents at **3–6 weeks** of age with **non-bilious**, projectile vomiting and a palpable olive-shaped mass. It does not cause delayed meconium. * **C. Cystic Fibrosis:** While it causes Meconium Ileus (another cause of delayed meconium), the question describes the classic presentation of Hirschsprung. In Meconium Ileus, the obstruction is due to inspissated secretions in the terminal ileum, not aganglionosis. * **D. Intestinal Malrotation:** Usually presents with acute onset bilious vomiting due to midgut volvulus, but it is not typically associated with a primary delay in passing meconium. **NEET-PG High-Yield Pearls:** * **Gold Standard Diagnosis:** Rectal suction biopsy (shows absence of ganglion cells and hypertrophied nerve bundles). * **Initial Screening:** Contrast enema (shows a "transition zone"). * **Physical Exam:** "Squirt sign" or "Blast sign" (explosive release of stool/gas on digital rectal exam). * **Association:** Strongly associated with **Down Syndrome** (Trisomy 21).

Q: All are features of Alagille syndrome, EXCEPT:

Hepatocellular jaundice. **Explanation:** Alagille syndrome (also known as syndromic bile duct paucity) is an autosomal dominant multisystem disorder caused by mutations in the **JAG1** or **NOTCH2** genes. **1. Why Option B is the Correct Answer:** The hallmark of Alagille syndrome is **cholestatic jaundice** (direct hyperbilirubinemia) due to a congenital paucity of intrahepatic bile ducts. "Hepatocellular jaundice" typically refers to jaundice resulting from primary damage to hepatocytes (like viral hepatitis), whereas Alagille syndrome is a classic **obstructive/cholestatic** process. Patients present with pruritus, xanthomas, and elevated alkaline phosphatase and bile acids. **2. Analysis of Incorrect Options:** * **A. Posterior embryotoxon:** This is the most common ocular finding (found in ~90% of cases). It is an anteriorly displaced Schwalbe’s line in the eye. * **C. Peripheral pulmonary stenosis:** Cardiovascular anomalies are present in nearly all patients, with peripheral pulmonary artery stenosis being the most frequent. * **D. Butterfly vertebrae:** This is a characteristic skeletal defect seen on X-ray, caused by the failure of the two halves of the vertebral body to fuse. **Clinical Pearls for NEET-PG:** * **Inheritance:** Autosomal Dominant. * **Classic Pentad:** Cholestasis (duct paucity), characteristic facies (broad forehead, deep-set eyes, pointed chin), butterfly vertebrae, posterior embryotoxon, and pulmonary stenosis. * **Diagnosis:** Liver biopsy showing a decreased bile duct-to-portal tract ratio (<0.4). * **Management:** Primarily supportive (fat-soluble vitamins A, D, E, K and Ursodeoxycholic acid). Unlike Biliary Atresia, the Kasai procedure is **not** indicated.

Q: A 5-year-old child presents with a history of loose stools, but no fever or blood in the stools. The mother reports the child is irritable and drinks water when offered. On examination, the child has sunken eyes, and the skin pinch test shows the skin retracts within two seconds but not immediately. What is the most appropriate management?

Administer ORS with zinc for 14 days.. ### Explanation This question tests the ability to classify and manage dehydration in a pediatric patient based on **IMNCI (Integrated Management of Neonatal and Childhood Illness)** guidelines. **1. Why Option D is Correct:** The child exhibits signs of **Some Dehydration**. According to IMNCI, "Some Dehydration" is diagnosed if two or more of the following are present: * Irritability/Restlessness * Sunken eyes * Drinks eagerly/thirsty * Skin pinch goes back slowly (less than 2 seconds) In this case, the child is irritable, has sunken eyes, drinks when offered, and the skin pinch is slow. The management for "Some Dehydration" is **Plan B**, which involves administering **Oral Rehydration Solution (ORS)** (75 ml/kg over 4 hours) and **Zinc supplementation** (20 mg/day for 14 days) to reduce the duration and recurrence of diarrhea. **2. Why Other Options are Incorrect:** * **Options A & C:** These describe the management for **Severe Dehydration** (Plan C). Severe dehydration requires signs like lethargy/unconsciousness, inability to drink, and skin pinch retracting *very* slowly (>2 seconds). This child is conscious and drinking, so IV fluids and urgent referral are not indicated. * **Option B:** Antibiotics are not indicated for simple watery diarrhea without blood (dysentery) or fever. Overuse of antibiotics in viral/osmotic diarrhea is discouraged. **3. Clinical Pearls for NEET-PG:** * **Skin Pinch Locations:** In children, the skin pinch is performed on the abdomen halfway between the umbilicus and the side. * **Zinc Dosage:** 6 months: 20 mg/day for 14 days. * **No Dehydration (Plan A):** Characterized by <2 signs; managed with increased home fluids and ORS after each stool. * **ORS Composition (Low Osmolarity):** Total osmolarity is **245 mOsm/L** (Sodium: 75, Glucose: 75, Potassium: 20, Chloride: 65, Citrate: 10). This is a high-yield fact for exams.

Q: A 4-year-old girl presents with pale, fatty, foul-smelling stools. She is at the 50th percentile for height and 10th percentile for weight. Her symptoms respond dramatically to a gluten-free diet. What is the most likely diagnosis?

Celiac sprue. **Explanation:** The clinical presentation of pale, fatty, foul-smelling stools (steatorrhea) combined with failure to thrive (weight percentile significantly lower than height) indicates a malabsorption syndrome. The definitive diagnostic clue in this case is the **dramatic response to a gluten-free diet**, which is the hallmark of **Celiac Sprue** (Gluten-sensitive enteropathy). **Why Celiac Sprue is correct:** Celiac disease is an immune-mediated enteropathy triggered by the ingestion of gluten (found in wheat, barley, and rye) in genetically susceptible individuals (HLA-DQ2/DQ8). The resulting villous atrophy in the small intestine leads to malabsorption. The "gold standard" for diagnosis is a small bowel biopsy showing villous atrophy, crypt hyperplasia, and increased intraepithelial lymphocytes, but clinical improvement upon gluten withdrawal is highly characteristic. **Why other options are incorrect:** * **Cystic Fibrosis (CF):** While CF causes steatorrhea due to pancreatic insufficiency, it would not respond to a gluten-free diet. CF also typically presents with recurrent respiratory infections. * **Menetrier Disease:** This is a rare protein-losing gastropathy characterized by giant gastric folds and hypoproteinemia (edema). It does not typically cause steatorrhea or respond to gluten restriction. * **Tropical Sprue:** This occurs in individuals living in or visiting tropical areas. While it presents similarly to Celiac disease, it is treated with antibiotics (Tetracycline) and folic acid, not a gluten-free diet. **NEET-PG High-Yield Pearls:** * **Best Initial Test:** Anti-tissue Transglutaminase (anti-tTG) IgA antibodies. * **Definitive Diagnosis:** Duodenal/Jejunal biopsy (Marsh Criteria). * **Associated Conditions:** Type 1 Diabetes, Down Syndrome, and Dermatitis Herpetiformis. * **Malignancy Risk:** Increased risk of Enteropathy-associated T-cell lymphoma (EATL) if untreated.

Q: A 2-day-old newborn presents with vomiting. Physical examination reveals an olive-sized mass in the epigastric area. Which of the following conditions is this child likely to exhibit?

Non-bilious vomiting. ### Explanation The clinical presentation of a palpable **"olive-sized mass"** in the epigastrium of a neonate is the pathognomonic physical finding for **Infantile Hypertrophic Pyloric Stenosis (IHPS)**. **1. Why "Non-bilious vomiting" is correct:** In IHPS, there is hypertrophy and hyperplasia of the muscular layers of the pylorus, leading to a functional gastric outlet obstruction. Because the obstruction occurs **proximal to the Ampulla of Vater** (where bile enters the duodenum), the vomitus contains only gastric contents and lacks bile. The vomiting is typically "projectile" and occurs shortly after feeding. **2. Analysis of Incorrect Options:** * **Biliary stenosis:** This would typically present with jaundice and acholic stools rather than a palpable abdominal mass and projectile vomiting. * **Duodenal atresia:** While it causes early neonatal vomiting, the obstruction is usually distal to the Ampulla of Vater, resulting in **bilious vomiting**. On X-ray, it shows the "double bubble" sign, not an olive-shaped mass. * **Pancreas divisum:** This is a congenital anomaly of the pancreatic ducts. It is usually asymptomatic in neonates and may present much later in life with recurrent pancreatitis; it does not cause a palpable epigastric mass or projectile vomiting. **3. NEET-PG High-Yield Pearls for IHPS:** * **Demographics:** Most common in first-born males (4:1 ratio); associated with **Erythromycin** use in early infancy. * **Metabolic Profile:** Classic finding is **Hypochloremic, hypokalemic metabolic alkalosis** with paradoxical aciduria. * **Diagnosis:** Ultrasound is the gold standard (Pyloric muscle thickness >4mm or length >14mm). Barium swallow shows the **"String sign"** or "Beak sign." * **Management:** Initial step is fluid resuscitation (Normal Saline). Definitive treatment is **Ramstedt’s Pyloromyotomy**.

Q: Oral Rehydration Solution (ORS) contains 75 mEq/litre of which electrolyte?

Sodium. The correct answer is **Sodium**. ### **Medical Concept: The WHO Low-Osmolarity ORS** The current standard for dehydration management is the **WHO Low-Osmolarity ORS**, introduced in 2002 to reduce the risk of hypernatremia and the need for unscheduled IV fluids. The formulation is based on the principle of **Glucose-coupled Sodium transport** in the small intestine; even during diarrhea, the SGLT-1 transporter remains functional, allowing sodium and water to be absorbed when glucose is present. In this formulation, the concentration of **Sodium is exactly 75 mEq/L**. ### **Analysis of Options** * **A. Sodium (75 mEq/L):** Correct. This concentration provides optimal rehydration while minimizing the risk of osmotic diarrhea associated with higher salt concentrations. * **B. Potassium (20 mEq/L):** Incorrect. Potassium is added to replace losses in stool, but its concentration is much lower than sodium. * **C. Glucose (75 mmol/L):** Incorrect. While the numerical value is the same (75), glucose is a non-electrolyte measured in mmol/L. It is essential for the co-transport of sodium. * **D. Chloride (65 mEq/L):** Incorrect. Chloride is the primary anion, but its concentration is lower than sodium to maintain electroneutrality alongside citrate. ### **High-Yield Clinical Pearls for NEET-PG** * **Total Osmolarity:** The total osmolarity of WHO Low-Osmolarity ORS is **245 mOsm/L** (Old ORS was 311 mOsm/L). * **Composition Breakdown:** * Sodium: 75 mEq/L * Chloride: 65 mEq/L * Glucose (Anhydrous): 75 mmol/L (13.5 g/L) * Potassium: 20 mEq/L * Citrate: 10 mmol/L (Trisodium citrate dihydrate: 2.9 g/L) * **Re-Somal:** A special ORS used for **Severely Malnourished** children; it has lower Sodium (45 mEq/L) and higher Potassium (40 mEq/L). * **Zinc Supplementation:** Always pair ORS with Zinc (20 mg/day for 14 days; 10 mg if <6 months) to reduce the duration and recurrence of diarrhea.

Q: Which question would be most helpful in obtaining a nursing history from the mother of an infant with suspected intussusception?

What do your child’s stools look like?. **Explanation:** **Intussusception** is the most common cause of intestinal obstruction in infants (aged 6–36 months). It occurs when a proximal segment of the bowel telescopes into a distal segment, leading to venous congestion and bowel wall edema. **Why Option C is Correct:** The hallmark clinical sign of intussusception is the passage of **"Red Currant Jelly" stools**. This occurs because the intense pressure on the telescoped bowel (intussusceptum) causes ischemia and mucus production; the resulting mixture of blood and mucus creates the characteristic appearance. Asking about the stool's appearance is the most specific diagnostic clue in the nursing history to confirm clinical suspicion. **Why Other Options are Incorrect:** * **Option A:** While poor feeding occurs due to abdominal pain, it is a non-specific finding seen in almost all pediatric illnesses. * **Option B:** Vomiting is common in intussusception (initially non-bilious, later bilious), but it is a general sign of any intestinal obstruction or gastroenteritis and lacks the diagnostic specificity of stool changes. * **Option D:** Urination frequency assesses hydration status. While important for management, it does not help differentiate intussusception from other causes of dehydration. **NEET-PG High-Yield Pearls:** * **Classic Triad:** Intermittent colicky abdominal pain (drawing up of knees), palpable sausage-shaped mass (usually in the right upper quadrant), and red currant jelly stools (present in <50% of cases). * **Dance’s Sign:** Emptiness in the Right Iliac Fossa. * **Diagnosis:** **Ultrasound** is the gold standard (Target/Donut sign or Pseudokidney sign). * **Treatment:** Non-operative reduction using **Air/Hydrostatic enema** is the first-line treatment if there are no signs of perforation or peritonitis.

Q: What is the most common cause of hematemesis in children?

Extrahepatic portal vein obstruction. **Explanation:** The most common cause of massive upper gastrointestinal bleeding (hematemesis) in children, particularly in the Indian subcontinent, is **Extrahepatic Portal Vein Obstruction (EHPVO)**. **1. Why EHPVO is the Correct Answer:** EHPVO is characterized by the replacement of the portal vein with a network of collateral vessels (cavernoma) due to thrombosis. This leads to **pre-hepatic portal hypertension**. Because the liver function remains normal, these children are otherwise healthy but present with sudden, painless, massive hematemesis due to the rupture of large esophageal varices. A common predisposing factor in neonates is umbilical vein catheterization or neonatal sepsis. **2. Why the Other Options are Incorrect:** * **Non-cirrhotic portal fibrosis (NCPF):** This is a common cause of portal hypertension in adults (typically 30–50 years) but is rare in the pediatric age group. * **Veno-occlusive disease (Sinusoidal Obstruction Syndrome):** This involves the small hepatic venules. While it causes portal hypertension, it typically presents with tender hepatomegaly, jaundice, and weight gain (ascites) rather than isolated massive hematemesis. * **Cirrhosis:** While cirrhosis is a major cause of portal hypertension (intra-hepatic), it is less common than EHPVO in children. Children with cirrhosis will also show signs of hepatic failure (jaundice, coagulopathy, stigmata of chronic liver disease), which are absent in EHPVO. **Clinical Pearls for NEET-PG:** * **Classic Presentation of EHPVO:** A child with a massive "splenomegaly," normal liver function tests (LFTs), and sudden hematemesis. * **Investigation of Choice:** Color Doppler Ultrasound (shows "Portal Cavernoma"). * **Treatment of Choice:** Endoscopic Variceal Ligation (EVL) for acute bleeds; **Meso-rex bypass** is the definitive surgical treatment for EHPVO in children.

Q: A child with diarrhea for 2 days shows the following sign. When is it considered very slow?

> 2 seconds. ***> 2 seconds*** - According to **WHO IMCI guidelines**, skin pinch test returning **>2 seconds** indicates **severe dehydration** and is classified as "very slow". - This threshold helps healthcare providers quickly assess **fluid loss** and determine urgent **rehydration therapy** needs in children with diarrhea. *> 3 seconds* - This exceeds the **WHO threshold** for severe dehydration, which is already established at **>2 seconds**. - Using **>3 seconds** would delay recognition of **severe dehydration** and potentially compromise timely treatment. *> 4 seconds* - This is significantly beyond the **WHO IMCI** recommended threshold for classifying severe dehydration. - Such a high threshold could lead to **underdiagnosis** of severe dehydration and delayed **emergency fluid replacement**. *> 5 seconds* - This threshold is far too high and not supported by **WHO IMCI protocols** for pediatric dehydration assessment. - Would result in **missed cases** of severe dehydration requiring immediate **intravenous rehydration** therapy.

Question 1

A 5-day-old term male neonate presents with delayed passage of meconium, abdominal distension, and bilious vomiting. What is the diagnosis?

Accepted Answer

Congenital aganglionic megacolon

Answer

Hypertrophic pyloric stenosis

Answer

Cystic fibrosis

Answer

Intestinal malrotation

Question 2

All are features of Alagille syndrome, EXCEPT:

Accepted Answer

Hepatocellular jaundice

Answer

Posterior embryotoxon

Answer

Peripheral pulmonary stenosis

Answer

Butterfly vertebrae

Question 3

A 5-year-old child presents with a history of loose stools, but no fever or blood in the stools. The mother reports the child is irritable and drinks water when offered. On examination, the child has sunken eyes, and the skin pinch test shows the skin retracts within two seconds but not immediately. What is the most appropriate management?

Accepted Answer

Administer ORS with zinc for 14 days.

Answer

Administer first dose of IV antibiotic and immediately refer to a higher center.

Answer

Give oral antibiotics and ORS and instruct the mother to continue and visit the next day.

Answer

Consider severe dehydration, start IV fluids, antibiotics, and refer to a higher center.

Question 4

A 4-year-old girl presents with pale, fatty, foul-smelling stools. She is at the 50th percentile for height and 10th percentile for weight. Her symptoms respond dramatically to a gluten-free diet. What is the most likely diagnosis?

Accepted Answer

Celiac sprue

Answer

Cystic fibrosis of the pancreas

Answer

Menetrier disease

Answer

Tropical sprue

Question 5

A 2-day-old newborn presents with vomiting. Physical examination reveals an olive-sized mass in the epigastric area. Which of the following conditions is this child likely to exhibit?

Accepted Answer

Non-bilious vomiting

Answer

Biliary stenosis

Answer

Duodenal atresia

Answer

Pancreas divisum

Question 6

Oral Rehydration Solution (ORS) contains 75 mEq/litre of which electrolyte?

Accepted Answer

Sodium

Answer

Potassium

Answer

Glucose

Answer

Chloride

Question 7

Which question would be most helpful in obtaining a nursing history from the mother of an infant with suspected intussusception?

Accepted Answer

What do your child’s stools look like?

Answer

Is your child eating normally?

Answer

How often has your child been vomiting?

Answer

When did your child last urinate?

Question 8

What is the most common cause of hematemesis in children?

Accepted Answer

Extrahepatic portal vein obstruction

Answer

Non-cirrhotic portal fibrosis

Answer

Veno-occlusive disease

Answer

Cirrhosis

Question 9

Hirschsprung's disease involves which region of the intestine?

Accepted Answer

Rectosigmoid

Answer

Colon

Answer

Rectum

Answer

Terminal ileum

Question 10

A child with diarrhea for 2 days shows the following sign. When is it considered very slow?

Accepted Answer

> 2 seconds

Answer

> 3 seconds

Answer

> 4 seconds

Answer

> 5 seconds

Gastroenterology — MCQs

Gastroenterology — MCQs

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