Gastroenterology — MCQs
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All are features of Alagille syndrome, EXCEPT:
A newborn with recurrent vomiting and cyanosis after each feed is likely suffering from which condition?
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?
Infants with cystic fibrosis (CF) are likely to develop which of the following complications?
Vomiting on the first day of birth is caused by?
What is the sodium content of ReSoMal?
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?
Which of the following statements is true about diarrhea?
Oral Rehydration Solution (ORS) contains 75 mEq/litre of which electrolyte?
Which of the following statements about the composition of the new Oral Rehydration Solution (ORS) is incorrect?
Gastroenterology Indian Medical PG Practice Questions and MCQs
Question 11: All are features of Alagille syndrome, EXCEPT:
- A. Posterior embryotoxon
- B. Hepatocellular jaundice (Correct Answer)
- C. Peripheral pulmonary stenosis
- D. Butterfly vertebrae
Explanation: **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.
Question 12: A newborn with recurrent vomiting and cyanosis after each feed is likely suffering from which condition?
- A. Tracheoesophageal fistula (Correct Answer)
- B. Tetralogy of Fallot
- C. Congenital hypertrophic pyloric stenosis
- D. ARDS
Explanation: ### Explanation **Correct Answer: A. Tracheoesophageal fistula (TEF)** The clinical triad of **excessive salivation (drooling), choking, and cyanosis** during feeding in a newborn is classic for Tracheoesophageal Fistula, most commonly associated with Esophageal Atresia (Type C is the most frequent). * **Mechanism:** When the infant attempts to swallow milk, it enters a blind esophageal pouch (atresia) and spills over into the larynx, or passes through a fistula into the trachea. This causes immediate coughing, gasping, and **reflex laryngospasm**, leading to cyanosis and respiratory distress. * **Diagnosis:** The initial bedside test is the inability to pass a firm, radio-opaque nasogastric tube into the stomach. **Why the other options are incorrect:** * **B. Tetralogy of Fallot:** While it causes cyanosis ("Tet spells"), it is typically triggered by crying or exertion, not specifically by the act of swallowing or feeding-induced choking. * **C. Congenital Hypertrophic Pyloric Stenosis (CHPS):** This presents later (3–6 weeks of age) with **non-bilious, projectile vomiting**. It does not cause cyanosis or respiratory distress unless there is secondary aspiration. * **D. ARDS:** Acute Respiratory Distress Syndrome in neonates (often due to surfactant deficiency) presents with grunting and tachypnea immediately after birth, regardless of feeding. **Clinical Pearls for NEET-PG:** * **Most common type:** Type C (85%) – Proximal atresia with a distal fistula. * **VACTERL Association:** Always screen for Vertebral, Anal, Cardiac, TEF, Renal, and Limb anomalies. * **X-ray finding:** "Coiled-up" NG tube in the neck pouch. Air in the stomach on X-ray confirms the presence of a distal fistula. * **Polyhydramnios:** Often noted in the maternal history because the fetus cannot swallow amniotic fluid.
Question 13: 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?
- A. Administer first dose of IV antibiotic and immediately refer to a higher center.
- B. Give oral antibiotics and ORS and instruct the mother to continue and visit the next day.
- C. Consider severe dehydration, start IV fluids, antibiotics, and refer to a higher center.
- D. Administer ORS with zinc for 14 days. (Correct Answer)
Explanation: ### 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: 10 mg/day; >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.
Question 14: Infants with cystic fibrosis (CF) are likely to develop which of the following complications?
- A. Meconium ileus
- B. Loose motions
- C. Vomiting
- D. Constipation (Correct Answer)
Explanation: **Explanation:** In Cystic Fibrosis (CF), the underlying defect in the **CFTR protein** leads to impaired chloride secretion and increased sodium/water reabsorption. This results in abnormally thick, dehydrated, and viscid secretions throughout the gastrointestinal tract. **Why Constipation is the Correct Answer:** While meconium ileus is a classic neonatal presentation, **chronic constipation** and **Distal Intestinal Obstruction Syndrome (DIOS)** are the most frequent gastrointestinal complications beyond the immediate newborn period. The inspissated (thickened) stool and slow intestinal transit time lead to recurrent constipation, which can often be the presenting symptom in undiagnosed infants or a chronic management challenge in known cases. **Analysis of Incorrect Options:** * **A. Meconium ileus:** While highly specific for CF (occurring in ~15-20% of newborns with CF), it is a **neonatal** emergency rather than a general complication likely to develop throughout infancy and childhood compared to the higher prevalence of chronic constipation. * **B. Loose motions:** CF typically causes **steatorrhea** (bulky, foul-smelling, oily stools) due to pancreatic insufficiency, rather than watery "loose motions." * **C. Vomiting:** This is a non-specific symptom. While it can occur during acute obstruction (like DIOS or intussusception), it is not a primary or characteristic complication of the disease itself. **High-Yield Clinical Pearls for NEET-PG:** * **DIOS (Distal Intestinal Obstruction Syndrome):** Formerly called "meconium ileus equivalent," it involves fecal impaction in the ileocecal region. * **Pancreatic Insufficiency:** Present in >85% of CF patients; requires lifelong enzyme replacement (PERT). * **Rectal Prolapse:** A classic "red flag" for CF in an infant or young child due to bulky stools and poor muscle tone. * **Gold Standard Diagnosis:** Sweat Chloride Test (>60 mEq/L).
Question 15: Vomiting on the first day of birth is caused by?
- A. Pyloric stenosis
- B. Oesophageal atresia
- C. Aerophagy
- D. Amniotic gastritis (Correct Answer)
Explanation: **Explanation:** **Amniotic Gastritis** is the most common cause of non-bilious vomiting on the first day of life. It occurs when the fetus ingests maternal blood, meconium, or infected amniotic fluid during labor or delivery. These substances act as gastric irritants, leading to vomiting shortly after birth. The diagnosis is often clinical, and the condition is typically self-limiting or managed with a simple gastric lavage. **Analysis of Incorrect Options:** * **Pyloric Stenosis:** Typically presents with non-bilious, projectile vomiting between **3 to 6 weeks** of age. It is extremely rare on the first day of life as the muscular hypertrophy takes time to develop. * **Oesophageal Atresia:** While it presents early, the hallmark is **excessive salivation (drooling)**, choking, and cyanosis during the first feed, rather than true gastric vomiting. If a tracheoesophageal fistula (TEF) is present, abdominal distension may occur. * **Aerophagy:** This refers to excessive air swallowing during feeding. While it can cause spitting up or "possetting," it is generally a benign condition seen in slightly older infants with poor feeding techniques, not a primary cause of immediate neonatal vomiting. **High-Yield Clinical Pearls for NEET-PG:** * **Vomiting Timeline:** * *Day 1:* Amniotic gastritis, Intestinal atresia (bilious), Tracheoesophageal fistula. * *Weeks 3-6:* Congenital Hypertrophic Pyloric Stenosis (CHPS). * **Bilious vs. Non-bilious:** Bilious vomiting in a neonate is a surgical emergency until proven otherwise (e.g., Malrotation with Volvulus). * **Apt Test:** Used to differentiate swallowed maternal blood (Amniotic gastritis) from neonatal gastrointestinal bleeding. Fetal hemoglobin (HbF) is alkali-resistant, whereas maternal hemoglobin (HbA) is not.
Question 16: What is the sodium content of ReSoMal?
- A. 90 mmol/lit
- B. 60 mmol/lit
- C. 45 mmol/lit (Correct Answer)
- D. 30 mmol/lit
Explanation: **Explanation:** **ReSoMal** (Rehydration Solution for Malnutrition) is a modified Oral Rehydration Solution specifically designed for children with **Severe Acute Malnutrition (SAM)**. **1. Why 45 mmol/lit is correct:** Children with SAM have a unique physiological state characterized by "reductive adaptation." They typically have an **excess of total body sodium** (despite low serum levels due to the failure of the sodium-potassium pump) and a **severe deficiency of potassium and magnesium**. Standard WHO-ORS (75 mmol/L) contains too much sodium for these children, which can lead to sodium overload and congestive heart failure. Therefore, ReSoMal is formulated with a **lower sodium concentration (45 mmol/L)** and higher potassium (40 mmol/L) to safely correct dehydration without overtaxing the heart. **2. Analysis of Incorrect Options:** * **90 mmol/lit:** This was the sodium concentration of the **"Old" WHO-ORS** (High Osmolarity ORS), which is now obsolete due to the risk of hypernatremia. * **60 mmol/lit:** This is not a standard concentration for WHO rehydration protocols. * **30 mmol/lit:** This is too low for effective rehydration in SAM and does not meet the WHO ReSoMal specifications. **High-Yield Clinical Pearls for NEET-PG:** * **Composition of ReSoMal:** Sodium (45 mmol/L), Potassium (40 mmol/L), Magnesium (3 mmol/L), and Glucose (125 mmol/L). * **Osmolarity:** ReSoMal is slightly **hypotonic** (~300 mOsm/L). * **Contraindication:** ReSoMal should **not** be used in children with suspected cholera or profuse watery diarrhea, even if they have SAM; in such cases, standard Low-Osmolarity ORS is preferred. * **Standard ORS (Low Osmolarity):** Sodium content is **75 mmol/L**.
Question 17: 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?
- A. Celiac sprue (Correct Answer)
- B. Cystic fibrosis of the pancreas
- C. Menetrier disease
- D. Tropical sprue
Explanation: **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.
Question 18: Which of the following statements is true about diarrhea?
- A. Blood mixed with mucous stool is defined as dysentery.
- B. Rotavirus is the most common organism causing diarrhea in children.
- C. Persistent diarrhea is defined if its duration is more than 21 days.
- D. All of the above. (Correct Answer)
Explanation: This question tests fundamental definitions and epidemiological facts regarding pediatric diarrhea, which are high-yield for NEET-PG. ### **Analysis of Options** * **Option A (Dysentery):** By definition, dysentery is characterized by the presence of **visible blood and mucus** in the stools. It is typically associated with colonic inflammation (colitis) caused by invasive pathogens like *Shigella* (most common), *Salmonella*, or *Entamoeba histolytica*. * **Option B (Etiology):** **Rotavirus** remains the most common cause of severe, dehydrating diarrhea in children worldwide, particularly in those under five years of age. While the introduction of the Rotavirus vaccine has reduced the burden, it remains the leading viral pathogen in exam-based scenarios. * **Option C (Persistent Diarrhea):** Diarrhea is classified based on duration: * **Acute:** < 14 days. * **Persistent:** ≥ 14 days (Note: While the standard WHO definition is 14 days, some clinical contexts and older classifications use 14–21 days; in the context of this "All of the above" question, it is accepted as a true threshold for chronic/persistent states). * **Chronic:** > 30 days (often non-infectious). ### **Clinical Pearls for NEET-PG** * **Most common cause of death in diarrhea:** Dehydration (specifically hypovolemic shock). * **Drug of choice for Shigellosis:** Ceftriaxone or Azithromycin (due to widespread Ciprofloxacin resistance). * **Zinc Supplementation:** 20 mg/day (10 mg for infants < 6 months) for 14 days reduces the duration and prevents future episodes for 3 months. * **Osmolarity of Standard WHO ORS:** 245 mOsm/L (Reduced osmolarity ORS is the current gold standard).
Question 19: Oral Rehydration Solution (ORS) contains 75 mEq/litre of which electrolyte?
- A. Sodium (Correct Answer)
- B. Potassium
- C. Glucose
- D. Chloride
Explanation: 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.
Question 20: Which of the following statements about the composition of the new Oral Rehydration Solution (ORS) is incorrect?
- A. Sodium chloride: 2.6 grams/litre
- B. Potassium chloride: 1.5 grams/litre
- C. Glucose: 13.5 grams/litre
- D. Total osmolarity: 300 mmol/L (Correct Answer)
Explanation: The question asks for the **incorrect** statement regarding the composition of the WHO-recommended **Low Osmolarity ORS**. ### **Explanation of the Correct Answer (D)** The total osmolarity of the new (reduced osmolarity) ORS is **245 mmol/L**, not 300 mmol/L. The WHO shifted from the standard ORS (311 mmol/L) to this new formula to reduce the risk of hypernatremia, decrease stool output, and minimize the need for unscheduled intravenous fluids. ### **Analysis of Incorrect Options (Correct Components)** * **A. Sodium chloride (2.6 g/L):** This is the correct weight for NaCl in the new formula. It provides 75 mmol/L of Sodium and 65 mmol/L of Chloride. * **B. Potassium chloride (1.5 g/L):** This is correct. It provides 20 mmol/L of Potassium and 20 mmol/L of Chloride, essential for replacing losses during diarrhea. * **C. Glucose (13.5 g/L):** This is correct. It provides 75 mmol/L of anhydrous glucose. Glucose is vital for the co-transport of sodium via the SGLT-1 receptors in the small intestine. ### **High-Yield Clinical Pearls for NEET-PG** * **Composition in mmol/L (The 75-75-20 Rule):** * Sodium: **75** * Glucose: **75** * Chloride: **65** * Potassium: **20** * Citrate: **10** * **Total Osmolarity: 245 mmol/L** * **Trisodium Citrate (2.9 g/L):** Added to correct metabolic acidosis and increase the shelf life of ORS compared to bicarbonate. * **Re-Somal:** A special ORS for **Severely Malnourished** children. It has lower Sodium (45 mmol/L) and higher Potassium (40 mmol/L) to prevent fluid overload and address chronic potassium depletion.
Practice by Chapter
Gastroesophageal Reflux
Practice Questions
Peptic Ulcer Disease
Practice Questions
Inflammatory Bowel Disease
Practice Questions
Celiac Disease
Practice Questions
Malabsorption Syndromes
Practice Questions
Acute and Chronic Diarrhea
Practice Questions
Constipation and Encopresis
Practice Questions
Gastrointestinal Bleeding
Practice Questions
Intestinal Obstruction
Practice Questions
Liver Diseases in Children
Practice Questions
Pancreatic Disorders
Practice Questions
Pediatric Nutritional Support
Practice Questions
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