Gastroenterology Practice Questions

Q: A newborn presenting with intestinal obstruction and constipation showed, on abdominal X ray, multiple air fluid levels. Which of the following is NOT a likely diagnosis?

Pyloric obstruction. **Explanation:** The presence of **multiple air-fluid levels** on an abdominal X-ray indicates a **low intestinal obstruction** (distal to the duodenum). In such cases, air and fluid accumulate in multiple dilated loops of the small and/or large bowel. **1. Why Pyloric Obstruction is the correct answer:** Congenital Hypertrophic Pyloric Stenosis (CHPS) or pyloric atresia causes a **high gastric outlet obstruction**. Since the blockage is at the level of the stomach, air cannot pass into the distal intestines. An X-ray typically shows a single large gastric air bubble with a "gasless abdomen" distally. Therefore, multiple air-fluid levels are never seen in pyloric obstruction. **2. Analysis of Incorrect Options:** * **Duodenal Atresia:** While classically associated with the "double bubble" sign, if there is a partial obstruction or distal communication, some air can pass, though it typically shows limited fluid levels. However, in the context of this question, it is a more distal site than the pylorus. * **Ileal Atresia:** This is a classic cause of low intestinal obstruction. It presents with numerous dilated loops of small bowel and multiple air-fluid levels on an erect film. * **Ladd’s Bands:** Associated with malrotation, these bands can compress the duodenum or lead to midgut volvulus. This results in varying degrees of intestinal obstruction and can certainly present with multiple air-fluid levels if the obstruction is mid-jejunal or ileal. **Clinical Pearls for NEET-PG:** * **Double Bubble Sign:** Duodenal Atresia (associated with Down Syndrome). * **Triple Bubble Sign:** Jejunal Atresia. * **Ground Glass Appearance/Neuhauser Sign:** Meconium Ileus (Cystic Fibrosis). * **Egg-on-string Appearance:** Transposition of Great Arteries (Radiology overlap). * **Step-ladder pattern:** Characteristic of mechanical small bowel obstruction on X-ray.

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: A 2-hour-old male infant was diagnosed in utero with polyhydramnios. He is vomiting stomach contents and bile, a condition that has continued for 2 days. Radiographic examination reveals a "double bubble" sign on ultrasound scan. The child cries consistently and is constantly hungry but has lost 300 g in weight. Which of the following conditions will most likely explain the symptoms?

Duodenal atresia. ### Explanation **Correct Answer: B. Duodenal atresia** **1. Why it is correct:** The clinical triad of **polyhydramnios** (due to inability to swallow/absorb amniotic fluid), **bilious vomiting** shortly after birth, and the pathognomonic **"double bubble" sign** on imaging is classic for duodenal atresia. The "double bubble" represents air in the dilated stomach and the proximal duodenum, with no distal gas. Since the obstruction is distal to the ampulla of Vater, the vomitus is typically bilious. The weight loss and hunger are expected consequences of complete intestinal obstruction. **2. Why the other options are incorrect:** * **A. Duodenal stenosis:** While it presents similarly, stenosis is a partial obstruction. It usually presents later in life (not at 2 hours) and often shows some distal gas on X-ray, unlike the complete obstruction seen here. * **C. Hypertrophied pyloric sphincter (IHPS):** This typically presents at **3–6 weeks** of age with **non-bilious** projectile vomiting. The "double bubble" sign is not seen; instead, a "string sign" or "olive-shaped mass" is characteristic. * **D. Atrophied gastric antrum:** This is not a standard clinical entity causing neonatal intestinal obstruction or the "double bubble" sign. **3. High-Yield Clinical Pearls for NEET-PG:** * **Association:** Approximately 30% of infants with duodenal atresia have **Down Syndrome (Trisomy 21)**. * **Embryology:** Caused by a failure of **recanalization** of the duodenum during the 8th–10th week of gestation. * **Management:** Initial management involves nasogastric decompression and IV fluids. The definitive surgical treatment is **Duodenoduodenostomy** (Diamond-shaped anastomosis). * **Differential for Double Bubble:** Duodenal atresia, Annular pancreas, and Malrotation with Midgut Volvulus (though volvulus is a surgical emergency requiring immediate Doppler USG).

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: 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: A neonate with Down syndrome presents with bilious vomiting. Which of the following is the most likely diagnosis?

Duodenal atresia. **Explanation:** **1. Why Duodenal Atresia is Correct:** Duodenal atresia is the most common cause of neonatal intestinal obstruction in patients with **Down syndrome (Trisomy 21)**, occurring in approximately 30% of these cases. The hallmark clinical presentation is **bilious vomiting** within the first 24–48 hours of life because the obstruction is typically distal to the Ampulla of Vater. Radiologically, it is characterized by the classic **"Double Bubble Sign"** (air in the stomach and the proximal duodenum). **2. Why the Other Options are Incorrect:** * **Congenital Hypertrophic Pyloric Stenosis (CHPS):** This presents with **non-bilious**, projectile vomiting, typically between 3–6 weeks of age (not the immediate neonatal period). It is associated with a palpable "olive-shaped" mass. * **Ileal Atresia:** While it causes bilious vomiting, it is not specifically associated with Down syndrome. It usually presents with more significant abdominal distension and multiple air-fluid levels on X-ray. * **Anorectal Malformation:** While associated with VACTERL syndrome and Down syndrome, the primary presentation is the **failure to pass meconium** within 48 hours, rather than isolated early bilious vomiting. **3. High-Yield Clinical Pearls for NEET-PG:** * **Association:** 30% of infants with Duodenal Atresia have Down syndrome. * **Antenatal finding:** Polyhydramnios (due to inability of the fetus to swallow amniotic fluid). * **X-ray:** Double Bubble Sign. * **Management:** Gastric decompression followed by **Duodenoduodenostomy** (Kimura’s procedure). * **Differential for Bilious Vomiting:** Always rule out **Malrotation with Midgut Volvulus**, which is a surgical emergency.

Question 1

A newborn presenting with intestinal obstruction and constipation showed, on abdominal X ray, multiple air fluid levels. Which of the following is NOT a likely diagnosis?

Accepted Answer

Pyloric obstruction

Answer

Duodenal atresia

Answer

Ileal atresia

Answer

Ladd's bands

Question 2

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 3

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 4

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 5

A 2-hour-old male infant was diagnosed in utero with polyhydramnios. He is vomiting stomach contents and bile, a condition that has continued for 2 days. Radiographic examination reveals a "double bubble" sign on ultrasound scan. The child cries consistently and is constantly hungry but has lost 300 g in weight. Which of the following conditions will most likely explain the symptoms?

Accepted Answer

Duodenal atresia

Answer

Duodenal stenosis

Answer

Hypertrophied pyloric sphincter

Answer

Atrophied gastric antrum

Question 6

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 7

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 8

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 9

A neonate with Down syndrome presents with bilious vomiting. Which of the following is the most likely diagnosis?

Accepted Answer

Duodenal atresia

Answer

Congenital hypertrophic pyloric stenosis

Answer

Ileal atresia

Answer

Anorectal malformation

Question 10

In neonatal cholestasis, what percentage of direct bilirubin is typically considered elevated?

Accepted Answer

>20%

Answer

>10%

Answer

>15%

Answer

>25%

Gastroenterology — MCQs

Gastroenterology — MCQs

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