Gastroenterology — MCQs

Gastroenterology Indian Medical PG Practice Questions and MCQs

Question 221: Which of the following is not a sign of severe dehydration?

A. Tachycardia
B. Anuria
C. Increased thirst (Correct Answer)
D. Delayed capillary refill

Explanation: In pediatric gastroenterology, assessing the degree of dehydration is a critical skill for the NEET-PG exam. The WHO and IAP classify dehydration into three categories: No, Some, and Severe. **Explanation of the Correct Answer:** **C. Increased thirst** is a hallmark sign of **"Some Dehydration."** In this stage, the child is alert but restless/irritable and drinks eagerly due to an intact thirst mechanism. In **Severe Dehydration**, the child’s mental status deteriorates to lethargy or unconsciousness, and they become **unable to drink** or drink very poorly. Therefore, increased thirst is not a sign of severe dehydration. **Analysis of Incorrect Options:** * **A. Tachycardia:** As dehydration progresses to the severe stage, the body attempts to maintain cardiac output despite low intravascular volume, leading to a rapid, thready pulse. * **B. Anuria:** Severe dehydration leads to significant hypovolemia, causing decreased renal perfusion and a drastic drop in urine output (minimal to no urine for several hours). * **D. Delayed capillary refill:** A capillary refill time (CRT) of >3 seconds is a classic sign of peripheral circulatory collapse and shock, characteristic of severe dehydration. **Clinical Pearls for NEET-PG:** * **Best indicator of dehydration:** Percentage of acute weight loss. * **Most reliable clinical sign of dehydration:** Prolonged capillary refill time, abnormal skin turgor ("tenting"), and abnormal breathing patterns. * **Severe Dehydration Management:** Requires immediate IV resuscitation with Ringer’s Lactate (100 ml/kg). * **Key Distinction:** If the child is **irritable**, think "Some Dehydration"; if the child is **lethargic**, think "Severe Dehydration."

Question 222: Which metabolic anomaly is seen in pyloric stenosis?

A. Hypochloremic alkalosis (Correct Answer)
B. Metabolic acidosis with normal anion gap
C. Metabolic acidosis with increased anion gap
D. Hypocalcemia

Explanation: **Explanation:** In **Infantile Hypertrophic Pyloric Stenosis (IHPS)**, the hallmark metabolic derangement is **Hypochloremic, Hypokalemic Metabolic Alkalosis with Paradoxical Aciduria.** **Why Option A is correct:** The underlying mechanism is the persistent vomiting of gastric contents. Gastric juice is rich in **Hydrochloric acid (HCl)** and **Potassium (KCl)**. 1. **Loss of H+ ions:** Direct loss of gastric acid leads to a rise in serum bicarbonate, causing **metabolic alkalosis**. 2. **Loss of Cl- ions:** Depletion of chloride leads to **hypochloremia**. 3. **Renal Compensation:** To maintain blood volume (due to dehydration), the kidneys activate the Renin-Angiotensin-Aldosterone System (RAAS). Aldosterone acts on the distal tubule to reabsorb Sodium at the expense of excreting Potassium and Hydrogen ions. This worsens the alkalosis and leads to **hypokalemia** and **paradoxical aciduria** (excreting acidic urine despite systemic alkalosis). **Why other options are incorrect:** * **Options B & C:** Metabolic acidosis is not seen in pyloric stenosis because the obstruction is proximal to the alkaline secretions of the pancreas and bile. Acidosis would occur in conditions with lower intestinal obstruction or severe dehydration leading to lactic acidosis, but it is not the primary metabolic feature here. * **Option D:** Hypocalcemia is not a characteristic feature of IHPS. **High-Yield Clinical Pearls for NEET-PG:** * **Classic Presentation:** Non-bilious, projectile vomiting in a 3–6 week old male infant. * **Physical Exam:** Palpable "olive-shaped" mass in the epigastrium and visible gastric peristalsis. * **Diagnosis:** Ultrasound is the investigation of choice (Pyloric muscle thickness >4mm, length >14mm). * **Management:** It is a **medical emergency, not a surgical one**. Correct dehydration and electrolytes (Normal Saline + KCl) *before* performing **Ramstedt’s Pyloromyotomy**.

Question 223: In neonatal cholestasis, if the serum gamma glutamyl-transpeptidase (GGT) is more than 600 IU/L, what is the most likely diagnosis?

A. Neonatal hepatitis
B. Choledochal cyst
C. Sclerosing cholangitis
D. Biliary atresia (Correct Answer)

Explanation: **Explanation:** In neonatal cholestasis, the serum **Gamma-Glutamyl Transpeptidase (GGT)** level is a critical biochemical marker used to differentiate between intrahepatic and extrahepatic causes. **1. Why Biliary Atresia (BA) is correct:** Biliary Atresia is characterized by the progressive fibro-obliteration of the extrahepatic biliary tree. This mechanical obstruction leads to significant bile duct proliferation and damage to the biliary epithelium. Because GGT is primarily located on the membranes of cells lining the bile ducts, its levels rise dramatically in obstructive conditions. In BA, GGT levels are typically very high, often exceeding **500–600 IU/L**. A high GGT in a cholestatic neonate (along with an absent gallbladder on ultrasound) is highly suggestive of BA. **2. Why other options are incorrect:** * **Neonatal Hepatitis:** This is an intrahepatic cause of cholestasis (e.g., idiopathic or TORCH infections). While GGT can be elevated, it is usually much lower than in BA (typically <200–300 IU/L) because there is less bile duct proliferation. * **Choledochal Cyst:** While this is an obstructive cause, it usually presents with a classic triad (pain, jaundice, palpable mass) and is easily identified via ultrasound. While GGT is high, the extreme elevation (>600) is more classically associated with the intense ductal reaction seen in BA. * **Sclerosing Cholangitis:** This is extremely rare in the neonatal period and typically presents later in childhood, often associated with inflammatory bowel disease. **Clinical Pearls for NEET-PG:** * **Low GGT Cholestasis:** If a neonate has cholestasis but a **normal or low GGT**, think of **PFIC (Progressive Familial Intrahepatic Cholestasis) Types 1 and 2** or **Bile Acid Synthesis Defects**. * **Gold Standard Diagnosis:** While high GGT is suggestive, the gold standard for diagnosing Biliary Atresia is an **Intraoperative Cholangiogram (IOCG)**. * **Kasai Procedure:** For BA, the Portoenterostomy (Kasai procedure) is most successful if performed before **60 days of life**.

Question 224: Hyperbilirubinemia in a child can be due to which of the following conditions?

A. Breast milk jaundice (Correct Answer)
B. Cystic fibrosis
C. Fanconi's syndrome
D. α–1 antitrypsin deficiency

Explanation: **Explanation:** **Breast milk jaundice (Option A)** is the correct answer as it is a classic cause of **unconjugated hyperbilirubinemia** in neonates. It typically occurs after the first week of life (peaking at 2 weeks). The underlying mechanism involves high levels of **beta-glucuronidase** in breast milk, which deconjugates bilirubin in the intestines, leading to increased enterohepatic circulation. It is a benign condition, and breastfeeding should be continued. **Why other options are incorrect:** * **Cystic Fibrosis (Option B):** While it can cause neonatal cholestasis (conjugated hyperbilirubinemia) due to inspissated bile, it is not a primary or common cause of general "hyperbilirubinemia" in the context of standard pediatric jaundice questions unless specified as obstructive. * **Fanconi’s Syndrome (Option C):** This is a disorder of the proximal renal tubules leading to the loss of glucose, amino acids, and phosphates in the urine. It does not involve bilirubin metabolism. * **α–1 Antitrypsin Deficiency (Option D):** This is the most common genetic cause of **conjugated hyperbilirubinemia** (neonatal cholestasis) due to the accumulation of misfolded proteins in hepatocytes. However, in the context of this specific question, Breast Milk Jaundice is the most direct and classic association for pediatric hyperbilirubinemia. **High-Yield Clinical Pearls for NEET-PG:** 1. **Breast Milk vs. Breastfeeding Jaundice:** Breastfeeding jaundice occurs in the *first week* due to inadequate intake (dehydration/calorie deprivation), whereas Breast Milk jaundice occurs *after the first week*. 2. **Kramer’s Rule:** Used to clinically estimate bilirubin levels based on the cephalocaudal progression of jaundice. 3. **Phototherapy:** The most common treatment for indirect hyperbilirubinemia; it converts bilirubin into water-soluble **lumirubin** via structural isomerization.

Question 225: Which condition is characterized by an absent bile duct?

A. Alagille syndrome (Correct Answer)
B. Crigler Najjar Syndrome
C. Gilbert's Syndrome
D. Primary Sclerosing Cholangitis

Explanation: **Explanation:** **Alagille Syndrome (Option A)** is the correct answer. It is an autosomal dominant multisystem disorder, most commonly caused by a mutation in the **JAG1 gene**. The hallmark pathological feature is **ductopenia**, which refers to a congenital scarcity or **absence of intrahepatic bile ducts**. This leads to chronic cholestasis. Clinically, it is identified by a characteristic pentad: 1. **Cholestasis** (due to bile duct paucity). 2. **Congenital Heart Disease** (most commonly Peripheral Pulmonary Artery Stenosis). 3. **Skeletal abnormalities** (Butterfly vertebrae). 4. **Ocular findings** (Posterior embryotoxon). 5. **Facial features** (Broad forehead, deep-set eyes, and pointed chin). **Why other options are incorrect:** * **Crigler-Najjar Syndrome (Option B):** A genetic disorder characterized by a deficiency of the enzyme *UDP-glucuronosyltransferase*, leading to severe unconjugated hyperbilirubinemia. The bile ducts are anatomically normal. * **Gilbert’s Syndrome (Option C):** A common, benign condition involving a mild reduction in *UDP-glucuronosyltransferase* activity. It causes intermittent mild unconjugated jaundice; bile ducts are normal. * **Primary Sclerosing Cholangitis (Option D):** An inflammatory condition characterized by "beading" (strictures and dilations) of the bile ducts due to fibrosis, not a congenital absence of the ducts. **High-Yield Clinical Pearls for NEET-PG:** * **Biopsy finding:** A bile duct-to-portal tract ratio of **<0.4** is diagnostic of ductopenia in Alagille syndrome. * **Inheritance:** Autosomal Dominant (JAG1/NOTCH2 mutations). * **Most common cardiac lesion:** Peripheral Pulmonary Stenosis (unlike Tetralogy of Fallot, which is also associated but less frequent).

Question 226: A seven-year-old child presents with recurrent chest infections and exocrine pancreatic insufficiency. Sweat chloride levels have been observed between 40-60 mmol/L on two separate occasions. Which of the following tests should be performed next to support the diagnosis of cystic fibrosis?

A. Repeat sweat chloride levels on a different day
B. Demonstrate an abnormal nasal potential difference (Correct Answer)
C. Demonstrate the F508 mutation by DNA analysis
D. Demonstrate abnormal 72-hour fecal fat excretion

Explanation: **Explanation:** The clinical presentation of recurrent respiratory infections and exocrine pancreatic insufficiency is highly suggestive of **Cystic Fibrosis (CF)**. However, the sweat chloride levels (40-60 mmol/L) fall into the **intermediate/borderline range** (Normal: <40 mmol/L; Diagnostic: ≥60 mmol/L). **Why Option B is Correct:** According to the diagnostic criteria for CF, if a patient has clinical features but borderline sweat chloride results, the diagnosis must be confirmed by demonstrating **CFTR dysfunction** through ancillary tests. **Nasal Potential Difference (NPD)** measures the voltage across the nasal epithelium; patients with CF show a characteristic pattern (more negative baseline and failure to respond to chloride-free/isoproterenol solutions). This is a gold-standard physiological test for CFTR function when sweat tests are inconclusive. **Why Other Options are Incorrect:** * **Option A:** Repeating the sweat chloride test is unlikely to be helpful as it has already been performed twice with borderline results. * **Option C:** While DNA analysis is diagnostic, there are over 2,000 mutations. Testing only for the **F508del** (the most common mutation) may miss other mutations. A negative F508 test does not rule out CF. * **Option D:** Fecal fat excretion confirms malabsorption/pancreatic insufficiency but is not specific to CF and does not confirm the underlying genetic diagnosis. **Clinical Pearls for NEET-PG:** * **Gold Standard Diagnosis:** Sweat Chloride ≥60 mmol/L on two occasions. * **Intermediate Range:** 30–59 mmol/L (infants <6 months) or 40–59 mmol/L (older children). * **Most Common Mutation:** ΔF508 (Class II mutation - protein misfolding). * **NPD vs. ICM:** If NPD is unavailable, **Intestinal Current Measurement (ICM)** on a rectal biopsy is another functional test for CFTR activity.

Question 227: A 3-week-old boy presents with projectile, non-bilious vomiting after feeding. Physical examination reveals a firm, olive-like mass in the epigastric region. Ultrasound shows thickened pyloric muscle. What is the most likely pathological finding if the pyloric muscle is biopsied?

A. Hypertrophy of the muscularis propria (Correct Answer)
B. Inflammation of the mucosa
C. Dilatation of the stomach
D. Stricture of the duodenum

Explanation: **Explanation:** The clinical presentation of a 3-week-old male with **projectile, non-bilious vomiting** and a palpable **"olive-shaped" mass** in the epigastrium is pathognomonic for **Infantile Hypertrophic Pyloric Stenosis (IHPS)**. **Why Option A is correct:** The underlying pathology of IHPS is the **hypertrophy (and hyperplasia)** of the circular muscle fibers of the **muscularis propria** in the pylorus. This thickening narrows the pyloric canal and lengthens it, creating a functional gastric outlet obstruction. On ultrasound, a muscle thickness >3 mm or a pyloric length >14 mm is diagnostic. **Why the other options are incorrect:** * **Option B:** Inflammation is not the primary process; IHPS is a structural/mechanical hypertrophy, not an infectious or inflammatory "itis." * **Option C:** While gastric dilatation occurs secondary to the obstruction, it is a *consequence* of the pathology, not the pathological change within the pyloric muscle itself. * **Option D:** The obstruction occurs at the pylorus (the sphincter between the stomach and duodenum), not within the duodenum itself. Duodenal atresia/stricture typically presents with *bilious* vomiting. **NEET-PG High-Yield Pearls:** * **Metabolic Profile:** Classic finding is **Hypochloremic, Hypokalemic, Metabolic Alkalosis** with paradoxical aciduria. * **Demographics:** Most common in first-born males; associated with **Erythromycin/Azithromycin** use in early infancy. * **Initial Management:** The priority is always **fluid resuscitation** (Normal Saline) and correction of electrolyte imbalances before surgery. * **Definitive Treatment:** **Ramstedt’s Pyloromyotomy** (longitudinal incision of the hypertrophied muscle while leaving the mucosa intact).

Question 228: An infant presented with failure to thrive, stridor, otitis media, and esophagitis. What is the most probable diagnosis?

A. Tracheoesophageal fistula
B. Hypertrophic pyloric stenosis
C. Duodenal atresia
D. Gastroesophageal reflux disease (Correct Answer)

Explanation: **Explanation:** The clinical presentation of failure to thrive, respiratory symptoms (stridor), recurrent infections (otitis media), and esophagitis is classic for **Gastroesophageal Reflux Disease (GERD)** in infants. **Why GERD is the correct answer:** In infants, GERD occurs when the retrograde movement of gastric contents into the esophagus causes complications. * **Esophagitis:** Acid irritation leads to pain, irritability, and hematemesis. * **Failure to Thrive:** Caloric loss through vomiting and feeding aversion due to pain. * **Extra-esophageal manifestations:** Micro-aspiration or vagally mediated reflexes can cause **stridor**, wheezing, or chronic cough. Refluxate reaching the nasopharynx can cause Eustachian tube dysfunction, leading to **otitis media**. **Why other options are incorrect:** * **Tracheoesophageal fistula (TEF):** Usually presents in the immediate neonatal period with drooling, choking, and cyanosis during feeds. While it causes respiratory issues, it does not typically present as chronic failure to thrive with esophagitis in this pattern. * **Hypertrophic Pyloric Stenosis (HPS):** Characterized by non-bilious, **projectile vomiting** and a palpable "olive-shaped" mass. It typically presents at 3–6 weeks of age and leads to metabolic alkalosis, not stridor or otitis media. * **Duodenal Atresia:** Presents within the first 24–48 hours of life with **bilious vomiting** and a "double bubble" sign on X-ray. **NEET-PG High-Yield Pearls:** * **Sandifer Syndrome:** A specific manifestation of GERD in infants involving abnormal posturing (arching of the back and neck torsion) that mimics seizures. * **Gold Standard Diagnosis:** 24-hour esophageal pH monitoring (though clinical diagnosis is common). * **Management:** Conservative (thickened feeds, upright positioning) is first-line; PPIs are used for documented esophagitis.

Question 229: A newborn girl has not passed meconium for 48 hours, presents with abdominal distention and vomiting. What is the initial investigation of choice?

A. Manometry
B. Genotyping for cystic fibrosis
C. Lower GI contrast study (Correct Answer)
D. Serum trypsin immunoblot

Explanation: **Explanation:** The clinical presentation of delayed meconium passage (>24–48 hours), abdominal distention, and vomiting in a newborn suggests a distal intestinal obstruction. The two primary differentials are **Hirschsprung Disease (HD)** and **Meconium Ileus (MI)**. **Why Lower GI Contrast Study is the Initial Investigation:** A water-soluble contrast enema (Lower GI study) is the preferred initial diagnostic step because it serves both a diagnostic and potentially therapeutic purpose. * In **Hirschsprung Disease**, it reveals a "transition zone" (narrowed aganglionic segment with proximal dilation) and a reversed recto-sigmoid ratio. * In **Meconium Ileus**, it shows a "microcolon" and filling defects (meconium pellets). Gastrografin enemas can also help liquefy and flush out the inspissated meconium. **Analysis of Incorrect Options:** * **A. Manometry:** Anorectal manometry (showing absence of the recto-anal inhibitory reflex) is highly sensitive for HD but is technically difficult to perform and interpret in the first few days of life. It is usually done later. * **B & D. Genotyping and Serum Trypsin:** These are used to diagnose **Cystic Fibrosis (CF)**. While 90% of infants with Meconium Ileus have CF, these tests do not address the immediate anatomical obstruction and are not the "initial" step in an acute surgical presentation. **High-Yield Clinical Pearls for NEET-PG:** * **Gold Standard for HD:** Rectal Suction Biopsy (shows absence of ganglion cells and hypertrophied nerve bundles). * **X-ray finding:** "Soap bubble appearance" (Neuhauser sign) in the right iliac fossa is characteristic of Meconium Ileus. * **Rectal Exam:** In HD, a digital rectal exam often results in a "blast sign" (explosive release of gas and stool).

Question 230: A young boy presents with massive hematemesis. He had a fever for 15 days a few days back, which was treated with some drugs. Clinical examination reveals moderate splenomegaly. No other history is positive. What is the probable diagnosis?

A. Drug-induced gastritis
B. Esophageal tear
C. Bleeding duodenal ulcer
D. Esophageal varices (Correct Answer)

Explanation: **Explanation:** The clinical presentation of **massive hematemesis** associated with **splenomegaly** in a child is a classic indicator of **Portal Hypertension**, most commonly due to **Extrahepatic Portal Venous Obstruction (EHPVO)**. **Why Esophageal Varices is correct:** In children, EHPVO often follows an umbilical infection or a systemic febrile illness (as seen in this case). The fever likely led to dehydration or a prothrombotic state, causing portal vein thrombosis. This results in portal hypertension, leading to: 1. **Congestive Splenomegaly:** The spleen enlarges due to backed-up venous pressure. 2. **Esophageal Varices:** Portosystemic collaterals form; their rupture causes sudden, painless, massive hematemesis. The absence of jaundice or signs of liver failure (normal liver) further supports EHPVO over cirrhosis. **Why other options are incorrect:** * **Drug-induced gastritis:** While common after NSAID use for fever, it typically presents with coffee-ground emesis or melena and epigastric pain, but **never** with splenomegaly. * **Esophageal tear (Mallory-Weiss):** This follows forceful vomiting or retching. It does not explain the presence of splenomegaly. * **Bleeding duodenal ulcer:** This causes hematemesis and melena, usually associated with a history of dyspepsia. It does not cause splenomegaly. **Clinical Pearls for NEET-PG:** * **EHPVO** is the most common cause of massive upper GI bleed in children in India. * **Key Triad for EHPVO:** Massive hematemesis + Splenomegaly + Normal liver function tests (LFTs). * **Management:** Endoscopic Variceal Ligation (EVL) or Sclerotherapy is the acute treatment of choice. Propranolol is used for primary prophylaxis.

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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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