Gastroenterology — MCQs

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?

Q76Easy

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

Q77Medium

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?

Q78Easy

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

Q79Easy

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

Q80Medium

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?

Gastroenterology Indian Medical PG Practice Questions and MCQs

Question 71: Which one of the following drugs causes QT prolongation in a premature infant?

A. Cisapride (Correct Answer)
B. Metoclopramide
C. Omeprazole
D. Domperidone

Explanation: **Explanation:** **Cisapride** is a prokinetic agent previously used for Gastroesophageal Reflux Disease (GERD) in infants. Its mechanism involves facilitating acetylcholine release at the myenteric plexus via **5-HT4 receptor agonism**. However, it is notorious for causing **QT interval prolongation** and life-threatening ventricular arrhythmias (Torsades de Pointes). This occurs because Cisapride inhibits the **hERG (human Ether-à-go-go-Related Gene) potassium channels** in the heart, delaying ventricular repolarization. Premature infants are at higher risk due to immature metabolic pathways (CYP3A4 enzyme system), leading to toxic drug accumulation. Consequently, Cisapride has been largely withdrawn or strictly restricted worldwide. **Analysis of Incorrect Options:** * **B. Metoclopramide:** A dopamine (D2) antagonist used as a prokinetic. Its primary side effects in infants are extrapyramidal symptoms (dystonia) and methemoglobinemia, not QT prolongation. * **C. Omeprazole:** A Proton Pump Inhibitor (PPI). While it can cause hypomagnesemia with long-term use (which could indirectly affect the QT interval), it is not directly associated with QT prolongation in the neonatal period. * **D. Domperidone:** Though it can cause QT prolongation in adults at high doses, it does not cross the blood-brain barrier easily and is generally considered safer than Cisapride regarding cardiac toxicity in the pediatric population, though caution is still advised. **High-Yield Clinical Pearls for NEET-PG:** * **Drug Interactions:** Cisapride levels increase dangerously when co-administered with **CYP3A4 inhibitors** (e.g., Erythromycin, Ketoconazole), further increasing the risk of arrhythmias. * **Prokinetic of choice:** Currently, **Erythromycin** (at low doses) is often used as a prokinetic in preterm infants to improve feeding tolerance by acting on motilin receptors. * **Metoclopramide Warning:** Avoid in neonates due to the high risk of **tardive dyskinesia** and irritability.

Question 72: Pneumatosis intestinalis is most often seen in?

A. Neonatal necrotising enterocolitis (Correct Answer)
B. Midgut volvulus
C. Meconium peritonitis
D. Neonatal visceral perforation

Explanation: **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.

Question 73: Which of the following statements is true about cystic fibrosis?

A. The underlying defect is in sodium channel function.
B. Immune reactive trypsin may be checked on the Guthrie card. (Correct Answer)
C. In most cases, the gene defect is a loss of Valine at position 508 on chromosome 7.
D. A sweat test with a sodium content above 40 mmol/l is diagnostic.

Explanation: ### 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.

Question 74: Infants with cystic fibrosis (CF) are likely to develop which of the following complications?

A. Meconium ileus (Correct Answer)
B. Loose motions
C. Vomiting
D. All of the above

Explanation: **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.

Question 75: 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?

A. Administration of high doses of vitamin B6
B. Initial diet free of branched-chain amino acids
C. Lactose-free formula (Correct Answer)
D. Protein restriction and supplementation with citrulline

Explanation: 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**.

Question 76: What is the most common indication for live donor liver transplantation in children?

A. Viral hepatitis
B. Biliary atresia (Correct Answer)
C. Primary sclerosing cholangitis
D. Crigler-Najjar syndrome

Explanation: **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%).

Question 77: 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?

A. IV plus inhaled colistin
B. IM Streptomycin
C. IV Meropenem + inhaled tobramycin (Correct Answer)
D. IV Ceftriaxone

Explanation: ### **Explanation** **Diagnosis: Cystic Fibrosis (CF) with *Pseudomonas aeruginosa* Pneumonia** The clinical presentation is classic for **Cystic Fibrosis**: multisystem involvement including recurrent respiratory infections (pneumonia, pneumothorax, sinusitis), malabsorption (fatty stools/steatorrhea due to pancreatic insufficiency), and end-organ damage (biliary cirrhosis and renal calculi). The microbiology description—**non-fermenting, mucoid, oxidase-positive colonies**—is the classic laboratory signature of ***Pseudomonas aeruginosa***. In CF patients, *Pseudomonas* often adopts a "mucoid" phenotype due to alginate production, which correlates with chronic infection and a poor prognosis. **Why Option C is Correct:** Management of pulmonary exacerbations in CF caused by *Pseudomonas* requires **combination antibiotic therapy** to prevent resistance and achieve synergistic killing. * **Meropenem** (an antipseudomonal carbapenem) provides robust systemic coverage. * **Inhaled Tobramycin** (an aminoglycoside) delivers high drug concentrations directly to the airways with minimal systemic toxicity, which is crucial given this patient’s deranged renal and liver functions. **Analysis of Incorrect Options:** * **Option A:** While Colistin is used for multi-drug resistant (MDR) strains, it is generally reserved as a second-line agent due to significant nephrotoxicity, especially in a patient already showing deranged renal function. * **Option B:** Streptomycin is primarily an anti-tubercular drug and lacks sufficient activity against *Pseudomonas*. * **Option D:** Ceftriaxone is a 3rd generation cephalosporin but notably lacks activity against *Pseudomonas* ("LAME" mnemonic: *Listeria, Atypicals, MRSA, Enterococci* + *Pseudomonas* for Ceftriaxone). **Clinical Pearls for NEET-PG:** 1. **Genetics:** CF is caused by a mutation in the **CFTR gene** (most common: **ΔF508**) on Chromosome 7. 2. **Microbiology Shift:** *S. aureus* is the most common lung pathogen in early childhood; *P. aeruginosa* becomes dominant in adolescence and adulthood. 3. **Diagnosis:** Sweat Chloride test >60 mEq/L remains the gold standard. 4. **Vitamin Deficiency:** Patients are at high risk for fat-soluble vitamin deficiencies (A, D, E, K) due to pancreatic insufficiency.

Question 78: Which of the following conditions is associated with cholestasis and butterfly-shaped vertebrae?

A. Williams syndrome
B. Alagille syndrome (Correct Answer)
C. Holt Oram syndrome
D. Turner syndrome

Explanation: **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.

Question 79: Red current jelly stool is a characteristic feature of which condition?

A. Intussusception (Correct Answer)
B. Volvulus
C. Hirschsprung disease
D. Congenital High-Pressure Zone (CHPS)

Explanation: **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 80: 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?

A. Pyloric stenosis (Correct Answer)
B. Abdominal tuberculosis
C. Gastro-esophageal reflux disease
D. Cyclical vomiting

Explanation: ### Explanation **Correct Option: A. Pyloric Stenosis (Infantile Hypertrophic Pyloric Stenosis - IHPS)** The clinical presentation is classic for **Infantile Hypertrophic Pyloric Stenosis (IHPS)**. The underlying pathology involves hypertrophy and hyperplasia of the circular muscle layers of the pylorus, leading to gastric outlet obstruction. * **Age of Onset:** Typically presents between **3 to 6 weeks** of life. * **Projectile Vomiting:** The vomiting is characteristically **non-bilious** (as the obstruction is proximal to the ampulla of Vater) and occurs immediately after feeding. * **Visible Peristalsis:** After feeding, "left-to-right" gastric peristaltic waves are often visible in the epigastrium as the stomach attempts to force contents through the narrowed pyloric canal. * **Palpable Mass:** An olive-shaped mass (the hypertrophied pylorus) is often palpable in the right upper quadrant. **Why the other options are incorrect:** * **B. Abdominal Tuberculosis:** This is rare in neonates and typically presents with chronic symptoms like fever, weight loss, and abdominal distension, rather than acute projectile vomiting. * **C. Gastro-esophageal Reflux Disease (GERD):** While common in infants, GERD usually presents with effortless "spitting up" or regurgitation rather than forceful, projectile vomiting. It does not feature visible peristaltic waves. * **D. Cyclical Vomiting:** This syndrome involves paroxysmal episodes of intense vomiting separated by symptom-free intervals. It usually presents in older children (toddlers or school-age) and is often associated with a family history of migraines. **NEET-PG High-Yield Pearls:** * **Metabolic Abnormality:** The classic finding is **Hypochloremic, Hypokalemic, Metabolic Alkalosis** with paradoxical aciduria. * **Diagnosis:** **Ultrasound** is the gold standard (look for pyloric muscle thickness >4mm or length >14mm). * **Radiology Sign:** On Barium swallow, look for the **"String sign"** or **"Beak sign."** * **Treatment:** Initial management is fluid resuscitation (Normal Saline). The definitive surgery is **Ramstedt’s Pyloromyotomy**.

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Gastroesophageal Reflux

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Peptic Ulcer Disease

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Inflammatory Bowel Disease

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Celiac Disease

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Malabsorption Syndromes

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Acute and Chronic Diarrhea

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Constipation and Encopresis

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Gastrointestinal Bleeding

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Intestinal Obstruction

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Liver Diseases in Children

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Pancreatic Disorders

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Pediatric Nutritional Support

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