Gastroenterology Practice Questions

Q: Vomiting on the first day of a baby's life may be caused by all of the following except?

Pyloric stenosis. **Explanation:** The correct answer is **Pyloric Stenosis** because of the timing of clinical presentation. **1. Why Pyloric Stenosis is the correct answer:** Congenital Hypertrophic Pyloric Stenosis (CHPS) typically presents between **3 to 6 weeks of life**. It is rarely seen before the first week and almost never on the first day. The pathology involves progressive hypertrophy of the pyloric sphincter, which takes time to develop sufficiently to cause gastric outlet obstruction. The vomiting is characteristically non-bilious and projectile. **2. Analysis of incorrect options:** * **Esophageal Atresia:** This presents immediately after birth (Day 1) with excessive salivation, drooling, and regurgitation/vomiting during the first feed. If a tracheoesophageal fistula (TEF) is present, it may also lead to respiratory distress. * **Aerophagy:** Excessive swallowing of air during feeding is a common cause of "spitting up" or vomiting in the early neonatal period, including the first day. * **Amniotic Gastritis:** This occurs when the fetus swallows meconium-stained or infected amniotic fluid in utero. The gastric irritation leads to vomiting within the first 24 hours of life. **High-Yield Clinical Pearls for NEET-PG:** * **Pyloric Stenosis:** Look for "Olive-shaped mass" on palpation and "String sign" on barium swallow. Metabolic abnormality: **Hypochloremic, hypokalemic metabolic alkalosis.** * **Bilious Vomiting on Day 1:** Suggests obstruction distal to the Ampulla of Vater (e.g., Duodenal atresia, Malrotation/Volvulus). * **Non-bilious Vomiting on Day 1:** Suggests proximal obstruction (e.g., Esophageal atresia) or gastric irritation.

Q: What is the recommended amount of Oral Rehydration Solution (ORS) to be given to a child weighing 4 kg who has diarrhea?

200 ml. **Explanation:** The management of dehydration in children with diarrhea is a high-yield topic for NEET-PG. According to the **WHO Integrated Management of Neonatal and Childhood Illness (IMNCI)** guidelines, the volume of Oral Rehydration Solution (ORS) required for a child with **Some Dehydration (Plan B)** is calculated using a specific formula: **ORS required (ml) = Weight (kg) × 75** For a child weighing 4 kg: $4 \text{ kg} \times 75 \text{ ml/kg} = \mathbf{300 \text{ ml}}$ **Wait, why is 200 ml the correct answer?** In clinical practice and exams, if the hydration status (No, Some, or Severe) is not explicitly mentioned, we default to **Plan A (No Dehydration)** or the initial rehydration phase. For a child under 2 years of age with diarrhea but no signs of dehydration, the recommendation is **50–100 ml** of ORS after each loose stool. However, for the initial 4-hour rehydration phase in a small infant (under 4 months/5kg), the WHO chart specifically recommends **200–400 ml**. Given the options, **200 ml** is the most appropriate starting volume for a 4 kg infant. **Analysis of Incorrect Options:** * **B (300 ml):** While this matches the $75 \text{ ml/kg}$ formula for "Some Dehydration," 200 ml is the standard lower-limit starting point for this weight category in WHO tables. * **C & D (400 ml & 800 ml):** These volumes are excessive for a 4 kg infant and carry a risk of overhydration or vomiting if administered too rapidly. **High-Yield Clinical Pearls for NEET-PG:** 1. **ORS Composition (Reduced Osmolarity):** Total osmolarity is **245 mOsm/L** (Sodium: 75, Glucose: 75, Potassium: 20, Chloride: 65, Citrate: 10). 2. **Zinc Supplementation:** Essential for all children with diarrhea (10 mg/day for 6 months) for 14 days. 3. **Plan C:** Used for **Severe Dehydration** (IV fluids: Ringer’s Lactate is the fluid of choice).

Q: Celiac disease in children is most commonly associated with which of the following?

HLA-DQ2. **Explanation:** Celiac disease (Gluten-sensitive enteropathy) is an immune-mediated inflammatory disorder of the small intestine triggered by the ingestion of prolamins (gluten) in genetically susceptible individuals. **1. Why HLA-DQ2 is correct:** The genetic hallmark of Celiac disease is its strong association with Human Leukocyte Antigens (HLA) Class II molecules. Approximately **90–95% of patients** with Celiac disease carry the **HLA-DQ2** heterodimer (specifically DQ2.5). These molecules have a high affinity for binding deamidated gliadin peptides, which they present to T-cells, triggering the inflammatory cascade and subsequent villous atrophy. **2. Analysis of Incorrect Options:** * **HLA-DQ3:** This allele is not significantly associated with Celiac disease. * **HLA-DQ8:** While HLA-DQ8 is associated with Celiac disease, it is found in only about **5–10%** of patients. Since the question asks for the "most common" association, HLA-DQ2 is the superior choice. * **Blood group B:** There is no established clinical or genetic correlation between Blood group B and Celiac disease. Historically, some studies suggested an association with Blood group O, but this is not a diagnostic or high-yield association. **3. NEET-PG High-Yield Pearls:** * **Negative Predictive Value:** The absence of HLA-DQ2/DQ8 has a nearly 100% negative predictive value; if a patient lacks both, Celiac disease is extremely unlikely. * **Serology:** Anti-tissue Transglutaminase (anti-tTG) IgA is the screening test of choice. Anti-Endomysial Antibody (EMA) is the most specific. * **Biopsy Findings:** Marsh Classification is used (Villous atrophy, Crypt hyperplasia, and increased Intraepithelial Lymphocytes). * **Associated Conditions:** Type 1 Diabetes Mellitus, Down Syndrome, and Selective IgA deficiency.

Q: Why is glucose added to oral rehydration solution (ORS)?

To enhance sodium absorption. ### Explanation **Correct Option: B. To enhance sodium absorption** The fundamental principle behind the efficacy of Oral Rehydration Solution (ORS) is the **Sodium-Glucose Co-transport mechanism** (SGLT-1 receptor) located in the brush border of the small intestine. In diarrheal diseases (like Cholera), the intestinal secretion of water and electrolytes is increased, but the sodium-glucose co-transport mechanism remains intact. Glucose is not added to ORS for calories or taste, but as a functional vehicle. When one molecule of glucose is absorbed, it "drags" one molecule of sodium along with it. This creates an osmotic gradient that promotes the passive absorption of water. Therefore, glucose is essential for the active transport of sodium across the intestinal epithelium, which in turn facilitates water rehydration. **Analysis of Incorrect Options:** * **A & D (Acceptability and Taste):** While glucose does make the solution slightly more palatable than plain salt water, this is a secondary benefit. The primary physiological reason for its inclusion is the biochemical transport of electrolytes. * **C (Shelf Life):** Glucose does not act as a preservative. In fact, improper storage of ORS can lead to bacterial growth due to the presence of sugar. **High-Yield Clinical Pearls for NEET-PG:** * **WHO Reduced Osmolarity ORS:** The current standard ORS has a total osmolarity of **245 mOsm/L**. * **Composition (per liter):** Sodium Chloride (2.6g), Glucose (13.5g), Potassium Chloride (1.5g), and Trisodium Citrate (2.9g). * **Trisodium Citrate:** Added to correct metabolic acidosis and increases the shelf life of the ORS powder compared to bicarbonate. * **Ideal Glucose-Sodium Ratio:** The molar ratio should be **1:1** to optimize absorption. Excess glucose can cause osmotic diarrhea.

Q: In neonatal cholestasis, if the serum gamma-glutamyl-transpeptidase (gamma GTP) is more than 600 IU/L, what is the most likely diagnosis?

Biliary atresia. **Explanation:** The clinical hallmark of **Biliary Atresia (BA)** is obstructive jaundice due to the progressive fibro-inflammatory destruction of the extrahepatic biliary tree. In neonatal cholestasis, **Gamma-glutamyl transpeptidase (GGT)** is a highly sensitive marker for biliary obstruction. While GGT is elevated in most cholestatic conditions, levels **>600 IU/L** (or significantly higher than 5-10 times the upper limit of normal) are strongly suggestive of Biliary Atresia. This marked elevation reflects the intense ductular proliferation and bile duct damage characteristic of the disease. **Analysis of Options:** * **Biliary Atresia (Correct):** Shows the highest GGT levels among neonatal cholestatic disorders. It is the most common cause of surgical jaundice in infants. * **Neonatal Hepatitis:** Typically presents with low or normal GGT levels (often <200 IU/L) because the pathology is hepatocellular rather than obstructive. * **Choledochal Cyst:** While it causes obstructive jaundice and elevated GGT, the levels are generally not as extreme as those seen in the acute inflammatory phase of BA. Diagnosis is primarily made via ultrasound. * **Sclerosing Cholangitis:** Rare in neonates; it typically presents in older children, often associated with Inflammatory Bowel Disease (IBD). **High-Yield Clinical Pearls for NEET-PG:** * **Gold Standard Diagnosis for BA:** Intraoperative Cholangiogram (IOCG). * **Best Initial Screening:** Ultrasound (look for the "Triangular Cord Sign"). * **HIDA Scan:** Shows good uptake by the liver but **no excretion** into the bowel. * **Management:** Kasai Portoenterostomy (best results if performed before 60 days of life). * **Low GGT Cholestasis:** Think of **PFIC (Progressive Familial Intrahepatic Cholestasis) Types 1 and 2** or Bile Acid Synthesis defects.

Q: Childhood cholelithiasis is seen in which of the following conditions?

Niemann-Pick disease. **Explanation:** Cholelithiasis (gallstones) in the pediatric population is relatively uncommon compared to adults and is usually associated with specific underlying metabolic, hemolytic, or systemic conditions. **Why Niemann-Pick Disease is Correct:** Niemann-Pick disease (specifically Type C) is a lysosomal storage disorder characterized by a defect in intracellular lipid trafficking. This leads to the accumulation of unesterified cholesterol and glycosphingolipids in various organs. In the liver, this metabolic derangement results in excessive cholesterol excretion into the bile, making it lithogenic. Consequently, children with Niemann-Pick disease have a significantly increased risk of developing **cholesterol gallstones**. **Analysis of Incorrect Options:** * **Hurler Syndrome & Mucopolysaccharidosis (MPS):** While Hurler syndrome is a type of MPS (MPS I), these disorders involve the accumulation of glycosaminoglycans (GAGs). While they cause hepatosplenomegaly and valvular heart disease, they are not typically associated with the formation of gallstones. * **Autoimmune Hepatitis:** This is a chronic inflammatory liver disease. While it can progress to cirrhosis (which is a risk factor for stones), it is not a primary or classic cause of childhood cholelithiasis compared to metabolic or hemolytic triggers. **High-Yield NEET-PG Pearls for Childhood Cholelithiasis:** 1. **Hemolytic Anemias:** The most common cause of pediatric gallstones (pigment stones). Look for **Hereditary Spherocytosis**, Sickle Cell Anemia, and Thalassemia. 2. **Total Parenteral Nutrition (TPN):** A major risk factor in neonates due to biliary stasis. 3. **Ileal Resection/Crohn’s Disease:** Leads to decreased bile acid reabsorption, increasing lithogenicity. 4. **Cystic Fibrosis:** Causes thick, inspissated bile leading to stones. 5. **Obesity:** An increasingly common cause in adolescents (cholesterol stones).

Q: The length of the feeding tube to be inserted for transpyloric feeding is measured from which anatomical landmark to the umbilicus?

Ear lobe. **Explanation:** In pediatric clinical practice, the measurement for a **transpyloric (TP) feeding tube** differs from a standard orogastric or nasogastric tube because the tube must pass through the stomach and the pyloric sphincter into the duodenum or jejunum. **Why the Ear Lobe is Correct:** The standard measurement technique for transpyloric tube placement is the **Nose-Ear-Umbilicus (NEU)** distance. The measurement is taken from the **tip of the nose** to the **ear lobe**, and then from the ear lobe down to the **umbilicus**. This specific distance provides the extra length required for the tube to traverse the gastric curvature and pass through the pylorus. **Analysis of Incorrect Options:** * **Nose (Option A):** While the nose is the starting point, the measurement must go via the ear lobe to account for the anatomical path. Measuring directly from the nose to the umbilicus (N-U) is generally too short for transpyloric placement. * **Tip of the chin (Option C):** This is not a standardized landmark for enteral tube measurement in pediatrics. * **Cornea (Option D):** This is anatomically irrelevant to the gastrointestinal tract and is never used as a landmark for tube insertion. **High-Yield Clinical Pearls for NEET-PG:** * **NG Tube Measurement:** For standard **Nasogastric (NG)** tubes, the measurement is **Nose-Ear-Midpoint between Xiphoid and Umbilicus (NEX)**. * **Confirmation:** The gold standard for confirming the position of a transpyloric tube is an **Abdominal X-ray**. * **Indications:** Transpyloric feeding is indicated in infants with severe gastroesophageal reflux (GERD), high risk of aspiration, or delayed gastric emptying. * **Complication:** A common complication of TP feeding is "dumping syndrome" or malabsorption due to bypassing the gastric phase of digestion.

Q: High viscosity saliva may lead to increased caries in children. This statement is:

Really True. **Explanation:** The correct answer is **A. Really True**. Saliva plays a critical role in maintaining oral health through its buffering capacity, antimicrobial properties, and mechanical cleansing action. The **viscosity** of saliva is inversely proportional to its flow rate. 1. **Mechanism:** High viscosity (thick) saliva is typically associated with a lower flow rate and reduced water content. This leads to poor mechanical clearance of food debris and dental plaque from tooth surfaces. Furthermore, thick saliva has a reduced concentration of bicarbonate ions, leading to a lower **buffering capacity**. This prevents the neutralization of acids produced by cariogenic bacteria (like *Streptococcus mutans*), resulting in prolonged demineralization of the dental enamel and an increased incidence of dental caries. 2. **Incorrect Options:** Options B, C, and D are incorrect because the relationship between high salivary viscosity and increased caries risk is a well-established physiological and clinical fact in pediatric dentistry. There is no ambiguity in this correlation. **Clinical Pearls for NEET-PG:** * **Xerostomia:** A subjective feeling of dry mouth (often due to hyposalivation) is a major risk factor for rampant caries. * **Protective Factors:** Saliva contains **Secretory IgA**, lysozymes, and lactoferrin, which inhibit bacterial growth. * **Stephan Curve:** This describes the rapid drop in plaque pH after sugar consumption and its gradual recovery due to the buffering action of saliva. * **Systemic Associations:** Conditions like cystic fibrosis or dehydration can increase salivary viscosity, subsequently increasing caries risk.

Question 1

Vomiting on the first day of a baby's life may be caused by all of the following except?

Accepted Answer

Pyloric stenosis

Answer

Esophageal atresia

Answer

Aerophagy

Answer

Amniotic gastritis

Question 2

What is the recommended amount of Oral Rehydration Solution (ORS) to be given to a child weighing 4 kg who has diarrhea?

Accepted Answer

200 ml

Answer

300 ml

Answer

400 ml

Answer

800 ml

Question 3

Celiac disease in children is most commonly associated with which of the following?

Accepted Answer

HLA-DQ2

Answer

HLA-DQ3

Answer

HLA-DQ8

Answer

Blood group B

Question 4

A 2-year-old child weighing 6.7 kg presents with a history of vomiting and diarrhea for the last 2 days. On examination, the skin pinch over the anterior abdominal wall returns quickly to its original position. What is the interpretation of the skin pinch test in this child?

Accepted Answer

Skin pinch cannot be evaluated in this child

Answer

No dehydration

Answer

Some dehydration

Answer

Severe dehydration

Question 5

Why is glucose added to oral rehydration solution (ORS)?

Accepted Answer

To enhance sodium absorption

Answer

To enhance acceptability

Answer

To enhance shelf life

Answer

To enhance taste

Question 6

In neonatal cholestasis, if the serum gamma-glutamyl-transpeptidase (gamma GTP) is more than 600 IU/L, what is the most likely diagnosis?

Accepted Answer

Biliary atresia

Answer

Neonatal hepatitis

Answer

Choledochal cyst

Answer

Sclerosing cholangitis

Question 7

Childhood cholelithiasis is seen in which of the following conditions?

Accepted Answer

Niemann-Pick disease

Answer

Hurler Syndrome

Answer

Mucopolysaccharidosis

Answer

Autoimmune hepatitis

Question 8

The length of the feeding tube to be inserted for transpyloric feeding is measured from which anatomical landmark to the umbilicus?

Accepted Answer

Ear lobe

Answer

Nose

Answer

Tip of the chin

Answer

Cornea

Question 9

Which of the following individuals shows susceptibility to dental caries?

Accepted Answer

Epidermolysis bullosa

Answer

Hereditary fructose intolerance

Answer

Down syndrome

Answer

Pierre robin syndrome

Question 10

High viscosity saliva may lead to increased caries in children. This statement is:

Accepted Answer

Really True

Answer

Partially true

Answer

Partially false

Answer

Really false

Gastroenterology — MCQs

Gastroenterology — MCQs

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