Gastroenterology Practice Questions

Q: Pneumatosis intestinalis is most often seen in?

Neonatal necrotising enterocolitis. **Explanation:** **Pneumatosis intestinalis** is the pathognomonic radiographic finding for **Necrotizing Enterocolitis (NEC)**. It refers to the presence of gas within the subserosal or submucosal layers of the bowel wall. This occurs when the integrity of the intestinal mucosa is breached (due to ischemia or infection), allowing gas-producing bacteria to invade the bowel wall and release hydrogen gas. * **Why Option A is correct:** In NEC, the combination of mucosal injury, enteral feeding, and bacterial proliferation leads to intramural gas. On an X-ray, this appears as linear or curvilinear radiolucency following the contour of the bowel loops. * **Why Option B is incorrect:** Midgut volvulus typically presents with signs of high intestinal obstruction (e.g., "double bubble" or "corkscrew" appearance on contrast studies). While it can lead to ischemia, pneumatosis is not its hallmark. * **Why Option C is incorrect:** Meconium peritonitis is a chemical peritonitis resulting from intrauterine bowel perforation. The classic radiographic finding is **intra-abdominal calcifications**, not intramural gas. * **Why Option D is incorrect:** Neonatal visceral perforation (often a complication of NEC or spontaneous) results in **Pneumoperitoneum** (free air under the diaphragm/football sign), which is gas *outside* the bowel wall, rather than *within* it. **High-Yield Clinical Pearls for NEET-PG:** * **Bell’s Staging:** Used to grade the severity of NEC. * **Pneumatosis Intestinalis:** Stage II (Definite NEC). * **Portal Venous Gas:** A sign of advanced NEC (Stage III), indicating gas has migrated from the bowel wall into the mesenteric circulation. * **Most common site:** Terminal ileum and proximal colon. * **Initial Management:** NPO (Bowel rest), Nasogastric decompression, and broad-spectrum antibiotics.

Q: Which of the following statements is true about cystic fibrosis?

Immune reactive trypsin may be checked on the Guthrie card.. ### Explanation **Correct Answer: B. Immune reactive trypsin may be checked on the Guthrie card.** **Why it is correct:** Newborn screening for Cystic Fibrosis (CF) utilizes the **Guthrie card** (heel prick test). In CF, pancreatic duct obstruction leads to the leakage of pancreatic enzymes into the blood. **Immunoreactive Trypsinogen (IRT)** levels are elevated in affected neonates. If IRT is high, it is followed by DNA analysis or a sweat chloride test for confirmation. **Analysis of Incorrect Options:** * **Option A:** The defect is in the **CFTR (Cystic Fibrosis Transmembrane Conductance Regulator) protein**, which is a **Chloride channel**, not a sodium channel. Sodium transport is affected secondarily (increased reabsorption). * **Option C:** The most common mutation is the **deletion of Phenylalanine** (not Valine) at position **508** ($\Delta$F508) on the long arm of **Chromosome 7**. * **Option D:** For a sweat chloride test (Pilocarpine Iontophoresis), a value **$\geq$ 60 mmol/L** is diagnostic of CF. Values between 30–59 mmol/L are considered intermediate/borderline. **High-Yield Clinical Pearls for NEET-PG:** * **Inheritance:** Autosomal Recessive. * **Earliest Manifestation:** Meconium ileus (seen in ~15-20% of newborns). * **Gold Standard Diagnosis:** Sweat Chloride Test (Pilocarpine Iontophoresis). * **Common Infections:** *Staphylococcus aureus* (early childhood) and *Pseudomonas aeruginosa* (most common cause of chronic pulmonary infection). * **Infertility:** 95% of males are infertile due to **Congenital Bilateral Absence of Vas Deferens (CBAVD)**; spermatogenesis is usually normal. * **Radiology:** "Finger-in-glove" appearance on CXR due to mucoid impaction.

Q: Infants with cystic fibrosis (CF) are likely to develop which of the following complications?

Meconium ileus. **Explanation:** **Cystic Fibrosis (CF)** is an autosomal recessive disorder caused by mutations in the **CFTR gene**, leading to defective chloride transport and the production of abnormally thick, viscid secretions in various organs. **Why Meconium Ileus is the Correct Answer:** Meconium ileus is the **earliest clinical manifestation** of CF, occurring in approximately 15–20% of affected newborns. Due to the lack of pancreatic enzymes and abnormal intestinal mucins, the meconium becomes extremely thick and "tar-like," leading to an obstruction in the terminal ileum. This is considered pathognomonic for Cystic Fibrosis in the neonatal period. **Analysis of Incorrect Options:** * **Loose motions:** Infants with CF typically suffer from **steatorrhea** (foul-smelling, bulky, oily stools) due to exocrine pancreatic insufficiency, rather than simple loose motions. * **Vomiting:** While vomiting can occur as a secondary symptom of intestinal obstruction (like meconium ileus), it is a non-specific symptom and not a primary diagnostic complication or characteristic feature of the disease itself. * **All of the above:** Since meconium ileus is the specific, classic complication associated with CF pathophysiology in infants, this option is incorrect. **High-Yield Clinical Pearls for NEET-PG:** * **Gold Standard Diagnosis:** Sweat Chloride Test (Value >60 mEq/L). * **Radiology:** In meconium ileus, X-rays show a "soap-bubble" appearance (Neuhauser sign) in the right iliac fossa due to air mixing with thick meconium. * **Genetics:** Most common mutation is **ΔF508** on Chromosome 7. * **Associated Triad:** Chronic obstructive pulmonary disease, exocrine pancreatic insufficiency, and abnormally high sweat electrolytes.

Q: A 2-week-old infant is brought to the emergency department due to emesis and listlessness. The infant appears dehydrated, listless, and irritable with significant jaundice. Abdominal examination reveals hepatomegaly and splenomegaly. Laboratory findings include a total bilirubin of 15.8 mg/dL and a direct bilirubin of 5.5 mg/dL. Liver function tests are elevated, and the serum glucose is 38 mg/dL. Urinalysis is negative for glucose but positive for Gram-negative rods. Blood and urine cultures subsequently grow E. coli. Which of the following nutritional considerations should be considered in this child?

Lactose-free formula. The clinical presentation of a 2-week-old infant with jaundice (conjugated hyperbilirubinemia), hepatosplenomegaly, hypoglycemia, and **E. coli sepsis** is classic for **Classic Galactosemia** (deficiency of Galactose-1-phosphate uridyltransferase - GALT). ### Why Lactose-free Formula is Correct In Classic Galactosemia, the inability to metabolize galactose leads to the accumulation of galactose-1-phosphate, which is toxic to the liver, kidneys, and lens. **Lactose** (found in breast milk and standard formulas) is a disaccharide composed of glucose and **galactose**. Immediate management requires the lifelong elimination of dietary galactose. A **lactose-free formula** (usually soy-based) stops the production of toxic metabolites, reversing acute liver failure and preventing further damage. ### Why Other Options are Incorrect * **A. Vitamin B6:** High-dose B6 (Pyridoxine) is the treatment for B6-responsive **Homocystinuria**, not galactosemia. * **B. Branched-chain amino acids (BCAA) restriction:** This is the management for **Maple Syrup Urine Disease (MSUD)**, which typically presents with a "maple syrup" odor and neurological distress, not conjugated jaundice. * **D. Protein restriction and Citrulline:** This is the management for **Urea Cycle Disorders** (e.g., OTC deficiency), which present with severe hyperammonemia and respiratory alkalosis. ### NEET-PG High-Yield Pearls * **E. coli Sepsis:** This is the most characteristic complication of Galactosemia due to inhibited leucocyte bactericidal activity. * **Reducing Sugars:** Urinalysis in these patients shows positive non-glucose reducing substances (Benedict’s test positive, Dipstick negative). * **Long-term Complications:** Despite a strict diet, patients may still develop cataracts, speech deficits, and **premature ovarian failure**.

Q: What is the most common indication for live donor liver transplantation in children?

Biliary atresia. **Explanation:** **Biliary Atresia (Option B)** is the most common indication for liver transplantation in the pediatric population, accounting for approximately 50% of all childhood transplants. It is an idiopathic, progressive fibro-obliterative disease of the extrahepatic biliary tree. While the **Kasai portoenterostomy** is the initial surgical treatment of choice, many children eventually develop secondary biliary cirrhosis and portal hypertension, necessitating a liver transplant. Live donor liver transplantation (LDLT) is frequently utilized in these cases to avoid the high mortality associated with waiting lists for pediatric deceased donors. **Incorrect Options:** * **Viral Hepatitis (Option A):** While a cause of acute liver failure or chronic cirrhosis in adults, it is a rare indication for transplantation in children due to effective vaccination (HBV) and the slow progression of the disease. * **Primary Sclerosing Cholangitis (Option C):** This is more commonly seen in adolescents and adults, often associated with Inflammatory Bowel Disease (IBD), but it is far less frequent than biliary atresia in the pediatric age group. * **Crigler-Najjar Syndrome Type 1 (Option D):** This is a metabolic indication for transplant (due to severe unconjugated hyperbilirubinemia). While it is a classic "textbook" indication, it is statistically rare compared to the prevalence of biliary atresia. **High-Yield Clinical Pearls for NEET-PG:** * **Most common indication for pediatric transplant:** Biliary Atresia. * **Most common metabolic indication:** Alpha-1 antitrypsin deficiency (Wilson disease is more common in older children/adolescents). * **Kasai Procedure Timing:** Best outcomes occur when performed before **60 days of life**. * **Post-transplant survival:** Pediatric liver transplant recipients have excellent long-term survival rates (80-90%).

Q: Which of the following conditions is associated with cholestasis and butterfly-shaped vertebrae?

Alagille syndrome. **Explanation:** **Alagille Syndrome (Option B)** is an autosomal dominant multisystem disorder caused by mutations in the **JAG1** or **NOTCH2** genes. It is characterized by a paucity of interlobular bile ducts, leading to chronic **cholestasis**. The diagnosis is classically based on the presence of at least three of the following five major criteria: 1. **Cholestasis:** Chronic jaundice and pruritus due to bile duct paucity. 2. **Skeletal Abnormalities:** Most commonly **butterfly vertebrae** (failure of fusion of the anterior vertebral body arches). 3. **Ocular Findings:** Posterior embryotoxon (a prominent Schwalbe’s line). 4. **Cardiac Defects:** Most commonly peripheral pulmonary artery stenosis. 5. **Facial Features:** Characteristic "triangular facies" with a prominent forehead, deep-set eyes, and a pointed chin. **Why other options are incorrect:** * **Williams Syndrome (Option A):** Associated with "Elfin facies," supravalvular aortic stenosis, and hypercalcemia, but not cholestasis or butterfly vertebrae. * **Holt-Oram Syndrome (Option C):** Known as "Heart-Hand syndrome," it involves radial ray defects (absent/triphalangeal thumb) and ASD/VSD, but lacks hepatic involvement. * **Turner Syndrome (Option D):** Characterized by 45,XO karyotype, webbed neck, and coarctation of the aorta; while it can involve the liver, it is not associated with butterfly vertebrae. **High-Yield Clinical Pearls for NEET-PG:** * **Inheritance:** Autosomal Dominant. * **Most common cardiac lesion:** Peripheral Pulmonary Stenosis (unlike Tetralogy of Fallot, which is also seen but less common). * **Biopsy finding:** Paucity of bile ducts (Bile duct: Portal tract ratio <0.4). * **Butterfly vertebrae** are usually asymptomatic and incidental findings on X-ray.

Q: Red current jelly stool is a characteristic feature of which condition?

Intussusception. **Explanation:** **Intussusception** is the correct answer. It occurs when a proximal segment of the bowel (the intussusceptum) telescopes into an adjacent distal segment (the intussuscipiens). This leads to lymphatic and venous obstruction, causing significant edema of the intestinal wall. As the pressure increases, it results in the sloughing of the intestinal mucosa and the leakage of blood and mucus into the lumen. This specific mixture of blood and mucus produces the classic **"Red Currant Jelly" stool**, a hallmark sign of late-stage ischemia in intussusception. **Analysis of Incorrect Options:** * **Volvulus:** Typically presents with sudden onset bilious vomiting and abdominal distension. While it can cause bloody stools if infarction occurs, it does not classically produce the "currant jelly" appearance. * **Hirschsprung Disease:** Characterized by a failure to pass meconium within 48 hours of birth and chronic constipation. If it leads to enterocolitis, stools may be explosive and foul-smelling, but not currant jelly-like. * **Congenital Hypertrophic Pyloric Stenosis (CHPS):** Presents with non-bilious, projectile vomiting and a palpable "olive-shaped" mass. Stools are typically decreased in frequency (constipation) rather than bloody. **High-Yield Clinical Pearls for NEET-PG:** * **Classic Triad:** Intermittent abdominal pain (screaming fits), 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 (RIF) due to the migration of the cecum. * **Diagnosis:** Ultrasound is the gold standard (**Target or Donut sign** on transverse view; **Pseudokidney sign** on longitudinal view). * **Treatment:** Non-operative reduction using **Air or Hydrostatic enema** is the initial treatment of choice if there are no signs of perforation or peritonitis.

Question 1

Which one of the following drugs causes QT prolongation in a premature infant?

Accepted Answer

Cisapride

Answer

Metoclopramide

Answer

Omeprazole

Answer

Domperidone

Question 2

Pneumatosis intestinalis is most often seen in?

Accepted Answer

Neonatal necrotising enterocolitis

Answer

Midgut volvulus

Answer

Meconium peritonitis

Answer

Neonatal visceral perforation

Question 3

Which of the following statements is true about cystic fibrosis?

Accepted Answer

Immune reactive trypsin may be checked on the Guthrie card.

Answer

The underlying defect is in sodium channel function.

Answer

In most cases, the gene defect is a loss of Valine at position 508 on chromosome 7.

Answer

A sweat test with a sodium content above 40 mmol/l is diagnostic.

Question 4

Infants with cystic fibrosis (CF) are likely to develop which of the following complications?

Accepted Answer

Meconium ileus

Answer

Loose motions

Answer

Vomiting

Answer

All of the above

Question 5

A 2-week-old infant is brought to the emergency department due to emesis and listlessness. The infant appears dehydrated, listless, and irritable with significant jaundice. Abdominal examination reveals hepatomegaly and splenomegaly. Laboratory findings include a total bilirubin of 15.8 mg/dL and a direct bilirubin of 5.5 mg/dL. Liver function tests are elevated, and the serum glucose is 38 mg/dL. Urinalysis is negative for glucose but positive for Gram-negative rods. Blood and urine cultures subsequently grow E. coli. Which of the following nutritional considerations should be considered in this child?

Accepted Answer

Lactose-free formula

Answer

Administration of high doses of vitamin B6

Answer

Initial diet free of branched-chain amino acids

Answer

Protein restriction and supplementation with citrulline

Question 6

What is the most common indication for live donor liver transplantation in children?

Accepted Answer

Biliary atresia

Answer

Viral hepatitis

Answer

Primary sclerosing cholangitis

Answer

Crigler-Najjar syndrome

Question 7

A 22-year-old male presented with fever and increasing dyspnea. He has a history of frequent episodes of hemoptysis, sinusitis, pneumothorax, and fatty stools, for which he has been hospitalized multiple times. Investigations revealed deranged renal and liver function tests, cirrhotic changes in the liver with multiple renal calculi on USG abdomen, signs of necrotizing pneumonia on X-ray chest, and sputum culture showing non-fermenting, mucoid, oxidase-positive colonies. Which of the following drugs can be used to treat the identified organism?

Accepted Answer

IV Meropenem + inhaled tobramycin

Answer

IV plus inhaled colistin

Answer

IM Streptomycin

Answer

IV Ceftriaxone

Question 8

Which of the following conditions is associated with cholestasis and butterfly-shaped vertebrae?

Accepted Answer

Alagille syndrome

Answer

Williams syndrome

Answer

Holt Oram syndrome

Answer

Turner syndrome

Question 9

Red current jelly stool is a characteristic feature of which condition?

Accepted Answer

Intussusception

Answer

Volvulus

Answer

Hirschsprung disease

Answer

Congenital High-Pressure Zone (CHPS)

Question 10

A three-week-old infant presented with non-bilious, projectile vomiting. On examination, the child is slightly dehydrated. A vigorous peristaltic wave is seen moving from the left hypochondrium to the umbilicus after feeding. What is the most likely diagnosis in this infant?

Accepted Answer

Pyloric stenosis

Answer

Abdominal tuberculosis

Answer

Gastro-esophageal reflux disease

Answer

Cyclical vomiting

Gastroenterology — MCQs

Gastroenterology — MCQs

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