Gastroenterology Practice Questions

Q: A 3-month-old female infant weighing 4 kg presents with loose motions and signs of dehydration. What is the recommended amount of Oral Rehydration Solution (ORS) to be administered in the first four hours?

300 ml. **Explanation:** The management of dehydration in pediatric patients is a high-yield topic for NEET-PG, specifically following the **WHO Integrated Management of Neonatal and Childhood Illness (IMNCI)** guidelines. **1. Why 300 ml is correct:** According to **WHO Plan B** (management of "Some Dehydration"), the amount of Oral Rehydration Solution (ORS) to be administered in the first **4 hours** is calculated using the formula: * **Amount (ml) = Weight (kg) × 75** * For this infant: **4 kg × 75 ml/kg = 300 ml.** This volume is designed to replace the existing fluid deficit safely. If the child’s weight is unknown, age-based charts are used, where infants <4 months typically receive 200–400 ml. **2. Why incorrect options are wrong:** * **A (100 ml):** This is insufficient (only 25 ml/kg). This volume might be closer to the "maintenance" fluid required over a longer period but fails to correct an established deficit. * **C (500 ml) & D (600 ml):** These volumes (125–150 ml/kg) are excessive for a 4-hour window in a 4 kg infant. Over-hydration in small infants can lead to periorbital edema or fluid overload. **Clinical Pearls for NEET-PG:** * **Plan A:** No dehydration (Home management; 50–100 ml ORS after each stool). * **Plan B:** Some dehydration (75 ml/kg over 4 hours). * **Plan C:** Severe dehydration (IV fluids; 100 ml/kg Ringer’s Lactate). For infants 6 months, for 14 days, is essential to reduce the duration and recurrence of diarrhea.

Q: A 4-month-old child presents with 10 episodes of vomiting and 2-3 episodes of loose stools with crying over the last 24 hours. What is the best initial line of management?

Intravenous fluids. **Explanation:** The correct answer is **Intravenous (IV) fluids** because the clinical presentation indicates a high risk of severe dehydration and potential metabolic instability. **1. Why Intravenous Fluids?** In a 4-month-old infant, **10 episodes of vomiting** in 24 hours is the critical deciding factor. Frequent, persistent vomiting (more than 3-4 times an hour or continuous) is a "red flag" and a contraindication for oral rehydration. At this age, infants have a very low physiological reserve; the combination of high-frequency vomiting and diarrhea leads to rapid volume depletion and electrolyte imbalances. IV fluids are necessary to bypass the irritable GI tract, ensure immediate volume expansion, and prevent hypovolemic shock. **2. Why other options are incorrect:** * **Oral Rehydration Solution (ORS):** While ORS is the gold standard for mild-to-moderate dehydration, it is likely to fail in this case due to the high frequency of vomiting (10 episodes). The child will not be able to tolerate or retain the required oral volume. * **Breastfeeding only:** While breastfeeding should continue during diarrhea, it is insufficient as a sole treatment for an infant with active, frequent vomiting and fluid loss. * **Antibiotics:** Most cases of infantile diarrhea are viral (e.g., Rotavirus). Antibiotics are not indicated unless there is evidence of dysentery (blood in stools) or cholera. **Clinical Pearls for NEET-PG:** * **WHO Classification:** Always assess the degree of dehydration first (No, Some, or Severe). Persistent vomiting is a key indicator for **Plan C** (IV fluids). * **Fluid of Choice:** For initial resuscitation in pediatric shock/severe dehydration, use **Isotonic Crystalloids** (Normal Saline or Ringer’s Lactate) at 20 ml/kg bolus. * **Red Flags for IV Therapy:** Persistent vomiting, altered sensorium, paralytic ileus, or failure of ORS.

Q: Failure to pass meconium within 48 hours of birth in a newborn with no obvious external abnormality should lead to the suspicion of which of the following conditions?

Congenital aganglinosis. **Explanation:** The physiological passage of meconium occurs within 24 hours in 95% of healthy term neonates and within 48 hours in almost all. Failure to pass meconium within this window is a hallmark clinical presentation of **Hirschsprung disease (Congenital Aganglionosis)**. **1. Why Congenital Aganglionosis is correct:** Hirschsprung disease is caused by the failure of neural crest cells to migrate caudally, resulting in an aganglionic segment in the distal colon (always involving the rectum). This leads to a lack of peristalsis and a functional obstruction. Because the anus and external anatomy appear normal, the diagnosis is often suspected only after the delayed passage of meconium, followed by abdominal distension and bilious vomiting. **2. Why the other options are incorrect:** * **Anal Atresia:** This is an **obvious external abnormality** (imperforate anus) that would be detected during the initial newborn physical examination. * **Congenital Pouch Colon:** Often associated with anorectal malformations (ARM), this condition usually presents with an absent anal opening or a fistula, making it an "obvious" abnormality. * **Meconium Ileus:** While it causes delayed meconium passage, it is typically associated with **Cystic Fibrosis** and presents with intraluminal obstruction (thick, inspissated meconium) rather than a primary motility defect. It is less common than Hirschsprung disease in the general population. **Clinical Pearls for NEET-PG:** * **Gold Standard Diagnosis:** Full-thickness rectal biopsy showing absence of ganglion cells and presence of hypertrophied nerve bundles. * **Screening Test:** Anorectal manometry (shows absence of the Rectoanal Inhibitory Reflex - RAIR). * **Radiology:** Barium enema shows a "transition zone" between the narrow aganglionic segment and the dilated proximal colon. * **Association:** Strongly associated with **Down Syndrome** (Trisomy 21).

Q: What is the concentration of sodium in reduced osmolarity ORS (in mmol/litre)?

75. **Explanation:** The correct answer is **75 mmol/L**. This reflects the World Health Organization (WHO) and UNICEF recommendation for **Reduced Osmolarity ORS**, which was introduced to replace the older, high-osmolarity formula. **1. Why 75 mmol/L is correct:** The standard Reduced Osmolarity ORS is designed to optimize the co-transport of sodium and glucose in the small intestine. By lowering the sodium concentration to **75 mmol/L** and the total osmolarity to **245 mOsm/L**, the solution effectively reduces stool output, decreases the incidence of vomiting, and minimizes the risk of hypernatremia compared to the older formula. **2. Analysis of Incorrect Options:** * **Option A (50 mmol/L):** This is the sodium concentration found in **ReSoMal** (Rehydration Solution for Malnutrition), specifically designed for children with severe acute malnutrition (SAM) to avoid sodium overload. * **Option C (65 mmol/L):** This is the concentration of **Chloride** in the reduced osmolarity ORS, not sodium. * **Option D (20 mmol/L):** This is the concentration of **Potassium** in the reduced osmolarity ORS. **Clinical Pearls for NEET-PG:** * **Composition of Reduced Osmolarity ORS (mEq/L or mmol/L):** * Sodium: 75 * Chloride: 65 * Glucose (Anhydrous): 75 * Potassium: 20 * Citrate: 10 * **Total Osmolarity: 245 mOsm/L** * **High-Yield Fact:** The glucose-to-sodium ratio in the current ORS is **1:1**, which is the physiological ideal for the sodium-glucose luminal transporter (SGLT-1). * **Contraindications for ORS:** Paralytic ileus, intestinal obstruction, and altered sensorium (risk of aspiration).

Q: Which diagnostic modality is used to differentiate between neonatal hepatitis and biliary atresia in an infant presenting with jaundice?

Ultrasound. **Explanation:** The differentiation between **Biliary Atresia (BA)** and **Neonatal Hepatitis** is critical because BA requires urgent surgical intervention (Kasai procedure) before 60 days of life for a better prognosis. **Why Ultrasound is the Correct Answer:** High-resolution ultrasonography is the initial screening tool of choice. It is non-invasive and highly specific for Biliary Atresia when certain features are present: * **Triangular Cord Sign:** A cone-shaped fibrotic mass cephalad to the portal vein bifurcation (highly specific for BA). * **Gallbladder Abnormalities:** An absent, small (<19 mm), or irregular/atretic gallbladder. * **Post-prandial contraction:** Failure of the gallbladder to contract after feeding suggests BA. **Why Other Options are Incorrect:** * **B & C (ALT and AST):** These are markers of hepatocellular injury. While they are elevated in both conditions, they lack the specificity to differentiate between obstructive (BA) and parenchymal (Hepatitis) causes of neonatal jaundice. * **A (GGT):** While GGT is often higher in Biliary Atresia than in Neonatal Hepatitis, there is significant overlap between the two conditions, making it unreliable as a definitive diagnostic modality on its own. **High-Yield Clinical Pearls for NEET-PG:** * **Gold Standard Diagnosis:** Liver Biopsy is the most accurate (gold standard) pre-operative investigation, showing bile duct proliferation and portal fibrosis. * **HIDA Scan:** If the ultrasound is inconclusive, a HIDA scan is performed. **Absence of tracer excretion** into the intestine after 24 hours (despite premedication with Phenobarbital) is suggestive of BA. * **Definitive Management:** The **Kasai Portoenterostomy** is the treatment of choice for BA. If it fails, liver transplantation is required.

Q: Which of the following is TRUE about Cystic Fibrosis?

Positive sweat test. **Explanation:** Cystic Fibrosis (CF) is an autosomal recessive multisystem disorder caused by mutations in the **CFTR gene** on chromosome 7. The gold standard for diagnosis remains the **Sweat Chloride Test** (Pilocarpine Iontophoresis). * **Why Option B is correct:** A positive sweat test is defined as a chloride concentration **>60 mmol/L** on two separate occasions. This occurs because the defective CFTR protein fails to reabsorb chloride from the sweat duct lumen, leading to "salty sweat." * **Why Options C and D are technically incorrect in this context:** While CF is indeed caused by a CFTR mutation and can present as meconium ileus, the question likely follows the pattern of identifying the **diagnostic hallmark** or is a "single best answer" type where the clinical confirmation (Sweat Test) is prioritized. *Note: In many modern exams, if multiple options are factually true, the most specific diagnostic or definitive feature is chosen.* * **Why Option A is incorrect:** The incidence of 1:2000-3000 is specific to **Caucasian populations**. In India and other Asian countries, the incidence is much lower (estimated at 1:10,000 to 1:40,000), making it a relatively rare diagnosis in the Indian subcontinent. **High-Yield Clinical Pearls for NEET-PG:** * **Most common mutation:** ΔF508 (Class II mutation - protein misfolding). * **Earliest manifestation:** Meconium ileus (seen in 15-20% of newborns). * **Pancreas:** Exocrine insufficiency leading to steatorrhea and Vitamin A, D, E, K deficiency. * **Lungs:** Recurrent infections with *Staphylococcus aureus* (early childhood) and *Pseudomonas aeruginosa* (most common overall). * **Infertility:** 95% of males are infertile due to Congenital Bilateral Absence of Vas Deferens (CBAVD).

Q: Acute and recurrent pancreatitis is reported to occur in which of the following conditions?

Methylmalonic acidemia. **Explanation:** **Methylmalonic Acidemia (MMA)** is an autosomal recessive organic acidemia caused by a deficiency of the enzyme methylmalonyl-CoA mutase or its cofactor, adenosylcobalamin. While primarily presenting with metabolic acidosis, hyperammonemia, and ketonuria, **acute and recurrent pancreatitis** is a well-recognized and serious complication of MMA. The exact pathophysiology is not fully elucidated, but it is believed that the accumulation of toxic metabolites (like methylmalonic acid and propionyl-CoA) causes mitochondrial dysfunction and oxidative stress within pancreatic acinar cells, leading to autodigestion and inflammation. **Analysis of Incorrect Options:** * **Homocystinuria:** Characterized by ectopia lentis, marfanoid habitus, and a high risk of **thromboembolism**. It is not typically associated with pancreatitis. * **Maple Syrup Urine Disorder (MSUD):** Caused by a deficiency in branched-chain alpha-keto acid dehydrogenase. It presents with a "maple syrup" odor in urine and neurological deterioration (seizures, encephalopathy) but not pancreatitis. * **Tyrosinemia (Type I):** Primarily affects the liver and kidneys, leading to **liver failure, hepatocellular carcinoma**, and renal Fanconi syndrome. Pancreatitis is not a feature. **Clinical Pearls for NEET-PG:** * **Organic Acidemias & Pancreatitis:** Both **Methylmalonic acidemia** and **Propionic acidemia** are high-yield causes of recurrent pancreatitis in the pediatric population. * **Triad of MMA:** Recurrent vomiting, metabolic acidosis, and hyperammonemia. * **Management Hint:** Long-term management involves a protein-restricted diet and L-carnitine supplementation; some cases of MMA respond to Vitamin B12 (Hydroxycobalamin).

Question 1

Which of the following conditions presents with conjugated hyperbilirubinemia in infancy?

Accepted Answer

Dubin-Johnson syndrome

Answer

Gilbert syndrome

Answer

Crigler-Najjar syndrome

Answer

Breast milk jaundice

Question 2

A 3-month-old female infant weighing 4 kg presents with loose motions and signs of dehydration. What is the recommended amount of Oral Rehydration Solution (ORS) to be administered in the first four hours?

Accepted Answer

300 ml

Answer

100 ml

Answer

500 ml

Answer

600 ml

Question 3

A 4-month-old child presents with 10 episodes of vomiting and 2-3 episodes of loose stools with crying over the last 24 hours. What is the best initial line of management?

Accepted Answer

Intravenous fluids

Answer

Oral rehydration solution (ORS)

Answer

Breastfeeding only

Answer

Antibiotics

Question 4

Failure to pass meconium within 48 hours of birth in a newborn with no obvious external abnormality should lead to the suspicion of which of the following conditions?

Accepted Answer

Congenital aganglinosis

Answer

Anal atresia

Answer

Congenital pouch colon

Answer

Meconium ileus

Question 5

What is the concentration of sodium in reduced osmolarity ORS (in mmol/litre)?

Accepted Answer

75

Answer

50

Answer

65

Answer

20

Question 6

Which diagnostic modality is used to differentiate between neonatal hepatitis and biliary atresia in an infant presenting with jaundice?

Accepted Answer

Ultrasound

Answer

Gamma glutamyl transpeptidase

Answer

Alanine transaminase

Answer

Aspartate transaminase

Question 7

An infant presents with blood in the stools and an abdominal mass. What is the most likely diagnosis?

Accepted Answer

Idiopathic abdominal epilepsy

Answer

Intussusception

Answer

Volvulus

Answer

Hirschsprung's disease

Question 8

Which of the following is TRUE about Cystic Fibrosis?

Accepted Answer

Positive sweat test

Answer

Incidence is 1:2000

Answer

Mutation in CFTR gene

Answer

May present as meconium ileus

Question 9

Hirschsprung disease is due to which of the following?

Accepted Answer

Failure of migration of neural crest cells in a craniocaudal direction

Answer

Loss of anterior longitudinal cells

Answer

Loss of ganglionic cells in the paravertebral sympathetic chain

Answer

Idiosyncrasy

Question 10

Acute and recurrent pancreatitis is reported to occur in which of the following conditions?

Accepted Answer

Methylmalonic acidemia

Answer

Homocystinuria

Answer

Maple syrup urine disorder

Answer

Tyrosinemia

Gastroenterology — MCQs

Gastroenterology — MCQs

On this page

Practice by Chapter

Want unlimited practice?