Gastroenterology — MCQs

Gastroenterology Indian Medical PG Practice Questions and MCQs

Question 21: Which question would be most helpful in obtaining a nursing history from the mother of an infant with suspected intussusception?

A. Is your child eating normally?
B. How often has your child been vomiting?
C. What do your child’s stools look like? (Correct Answer)
D. When did your child last urinate?

Explanation: **Explanation:** **Intussusception** is the most common cause of intestinal obstruction in infants (aged 6–36 months). It occurs when a proximal segment of the bowel telescopes into a distal segment, leading to venous congestion and bowel wall edema. **Why Option C is Correct:** The hallmark clinical sign of intussusception is the passage of **"Red Currant Jelly" stools**. This occurs because the intense pressure on the telescoped bowel (intussusceptum) causes ischemia and mucus production; the resulting mixture of blood and mucus creates the characteristic appearance. Asking about the stool's appearance is the most specific diagnostic clue in the nursing history to confirm clinical suspicion. **Why Other Options are Incorrect:** * **Option A:** While poor feeding occurs due to abdominal pain, it is a non-specific finding seen in almost all pediatric illnesses. * **Option B:** Vomiting is common in intussusception (initially non-bilious, later bilious), but it is a general sign of any intestinal obstruction or gastroenteritis and lacks the diagnostic specificity of stool changes. * **Option D:** Urination frequency assesses hydration status. While important for management, it does not help differentiate intussusception from other causes of dehydration. **NEET-PG High-Yield Pearls:** * **Classic Triad:** Intermittent colicky abdominal pain (drawing up of knees), palpable sausage-shaped mass (usually in the right upper quadrant), and red currant jelly stools (present in <50% of cases). * **Dance’s Sign:** Emptiness in the Right Iliac Fossa. * **Diagnosis:** **Ultrasound** is the gold standard (Target/Donut sign or Pseudokidney sign). * **Treatment:** Non-operative reduction using **Air/Hydrostatic enema** is the first-line treatment if there are no signs of perforation or peritonitis.

Question 22: Freshly prepared ORS should be used within what time frame?

A. 12 hours
B. 1 day (Correct Answer)
C. 2 days
D. 4 hours

Explanation: **Explanation:** The correct answer is **1 day (24 hours)**. **1. Why the correct answer is right:** Oral Rehydration Solution (ORS) is a mixture of electrolytes and glucose. Once the powder is dissolved in water, it becomes a potential medium for bacterial growth. Glucose, in particular, promotes the multiplication of microorganisms if left at room temperature. According to WHO and UNICEF guidelines, a freshly prepared ORS solution must be discarded after **24 hours** to prevent the risk of secondary bacterial gastroenteritis and to ensure the chemical stability of the solution. **2. Why the incorrect options are wrong:** * **12 hours (Option A):** While using it sooner is safe, the standard clinical guideline allows for 24 hours. Discarding at 12 hours would be prematurely wasteful in resource-limited settings. * **2 days (Option C):** By 48 hours, the risk of significant bacterial contamination is high, and the solution is no longer considered safe for consumption, especially in infants with compromised gut integrity. * **4 hours (Option D):** This is too short a duration. ORS is designed to be sipped slowly over the course of the day to maintain hydration. **3. Clinical Pearls for NEET-PG:** * **Composition of WHO Low-Osmolarity ORS:** Sodium (75 mmol/L), Glucose (75 mmol/L), Chloride (65 mmol/L), Potassium (20 mmol/L), and Citrate (10 mmol/L). * **Total Osmolarity:** 245 mOsm/L (High-yield: This is lower than the older formula of 311 mOsm/L to reduce stool output and vomiting). * **Storage Tip:** If the solution is kept in a refrigerator, it must still be discarded after 24 hours. * **Reconstitution:** Always use clean drinking water; do not boil the ORS solution after adding the powder as it may alter the electrolyte composition.

Question 23: What is the most common cause of hematemesis in children?

A. Extrahepatic portal vein obstruction (Correct Answer)
B. Non-cirrhotic portal fibrosis
C. Veno-occlusive disease
D. Cirrhosis

Explanation: **Explanation:** The most common cause of massive upper gastrointestinal bleeding (hematemesis) in children, particularly in the Indian subcontinent, is **Extrahepatic Portal Vein Obstruction (EHPVO)**. **1. Why EHPVO is the Correct Answer:** EHPVO is characterized by the replacement of the portal vein with a network of collateral vessels (cavernoma) due to thrombosis. This leads to **pre-hepatic portal hypertension**. Because the liver function remains normal, these children are otherwise healthy but present with sudden, painless, massive hematemesis due to the rupture of large esophageal varices. A common predisposing factor in neonates is umbilical vein catheterization or neonatal sepsis. **2. Why the Other Options are Incorrect:** * **Non-cirrhotic portal fibrosis (NCPF):** This is a common cause of portal hypertension in adults (typically 30–50 years) but is rare in the pediatric age group. * **Veno-occlusive disease (Sinusoidal Obstruction Syndrome):** This involves the small hepatic venules. While it causes portal hypertension, it typically presents with tender hepatomegaly, jaundice, and weight gain (ascites) rather than isolated massive hematemesis. * **Cirrhosis:** While cirrhosis is a major cause of portal hypertension (intra-hepatic), it is less common than EHPVO in children. Children with cirrhosis will also show signs of hepatic failure (jaundice, coagulopathy, stigmata of chronic liver disease), which are absent in EHPVO. **Clinical Pearls for NEET-PG:** * **Classic Presentation of EHPVO:** A child with a massive "splenomegaly," normal liver function tests (LFTs), and sudden hematemesis. * **Investigation of Choice:** Color Doppler Ultrasound (shows "Portal Cavernoma"). * **Treatment of Choice:** Endoscopic Variceal Ligation (EVL) for acute bleeds; **Meso-rex bypass** is the definitive surgical treatment for EHPVO in children.

Question 24: Which one of the following is not a common feature of cystic fibrosis?

A. Exocrine pancreatic insufficiency
B. Azoospermia
C. Distal gastrointestinal obstruction
D. Polyneuropathy (Correct Answer)

Explanation: **Explanation:** Cystic Fibrosis (CF) is an autosomal recessive multisystem disorder caused by mutations in the **CFTR gene** (most commonly **ΔF508**), leading to defective chloride transport and thick, viscous secretions in various organs. **Why Polyneuropathy is the Correct Answer:** Polyneuropathy is **not** a feature of Cystic Fibrosis. CF primarily affects epithelial surfaces (lungs, pancreas, sweat glands, and reproductive tract). While chronic vitamin E deficiency (due to malabsorption) can rarely lead to neurological symptoms like ataxia or loss of vibratory sense, a generalized polyneuropathy is not a recognized clinical manifestation of the disease. **Analysis of Incorrect Options:** * **Exocrine Pancreatic Insufficiency:** Seen in >85% of patients. Thick secretions obstruct pancreatic ducts, leading to acinar atrophy and fibrosis. This results in malabsorption of fats and fat-soluble vitamins (A, D, E, K) and steatorrhea. * **Azoospermia:** Occurs in >95% of males due to **Congenital Bilateral Absence of the Vas Deferens (CBAVD)**. Spermatogenesis is usually normal, but the transport mechanism is absent. * **Distal Gastrointestinal Obstruction (DIOS):** Formerly called "meconium ileus equivalent," DIOS involves the accumulation of viscid chyme in the terminal ileum and cecum, causing intestinal obstruction in older children and adults. **Clinical Pearls for NEET-PG:** * **Gold Standard Diagnosis:** Sweat Chloride Test (>60 mEq/L on two occasions). * **Most common cause of death:** Progressive respiratory failure (common pathogens: *S. aureus* in early childhood, *P. aeruginosa* in adults). * **Newborn Screening:** Immunoreactive Trypsinogen (IRT) levels. * **GI Manifestation:** Meconium ileus is the earliest clinical sign (seen in 15-20% of newborns).

Question 25: Aspirin is associated with which of the following conditions?

A. Reye's Syndrome (Correct Answer)
B. Sjogren Syndrome
C. Reiter Syndrome
D. None of the above

Explanation: **Explanation:** **Reye’s Syndrome (Correct Answer):** Reye’s Syndrome is a rare but life-threatening condition characterized by **acute encephalopathy** and **fatty degeneration of the liver (microvesicular steatosis)**. It is strongly associated with the use of **Aspirin (salicylates)** in children and adolescents during a viral prodrome, most commonly **Influenza B** or **Varicella**. The underlying pathophysiology involves **mitochondrial dysfunction**, leading to impaired fatty acid oxidation and hyperammonemia. Due to this risk, Aspirin is contraindicated in children under 16 years of age, except in specific conditions like Kawasaki disease. **Incorrect Options:** * **Sjogren Syndrome:** An autoimmune systemic connective tissue disorder characterized by lymphocytic infiltration of exocrine glands, leading to dry eyes (keratoconjunctivitis sicca) and dry mouth (xerostomia). It has no association with Aspirin. * **Reiter Syndrome (Reactive Arthritis):** A triad of urethritis, conjunctivitis, and arthritis that typically follows a gastrointestinal or genitourinary infection (e.g., Chlamydia). It is an HLA-B27 associated spondyloarthropathy and is not triggered by salicylate use. **High-Yield Clinical Pearls for NEET-PG:** * **Liver Biopsy Finding:** Microvesicular steatosis (no inflammation). * **Biochemical Markers:** Elevated serum ammonia, prolonged Prothrombin Time (PT), and elevated AST/ALT with **normal bilirubin**. * **Management:** Supportive care; IV Mannitol or hypertonic saline may be used to manage cerebral edema. * **Exception:** Aspirin is the drug of choice in **Kawasaki Disease**, despite the theoretical risk of Reye’s Syndrome; in such cases, the Influenza vaccine is strictly recommended.

Question 26: Hirschsprung's disease involves which region of the intestine?

A. Colon
B. Rectum
C. Rectosigmoid (Correct Answer)
D. Terminal ileum

Explanation: **Explanation:** Hirschsprung’s disease (Congenital Aganglionic Megacolon) is characterized by the absence of ganglion cells in the **Meissner’s (submucosal)** and **Auerbach’s (myenteric)** plexuses. This occurs due to the failure of neural crest cells to migrate cranio-caudally during embryonic development. **Why Rectosigmoid is correct:** Neural crest migration begins at the esophagus and ends at the anus. Because migration occurs in a proximal-to-distal direction, the **rectum and sigmoid colon** are the most frequently affected sites (approximately 80% of cases). The aganglionic segment remains tonically contracted, leading to a functional obstruction and proximal dilation of the normal colon. **Analysis of Incorrect Options:** * **A. Colon:** While the disease affects the large intestine, "Colon" is too broad. The disease specifically starts at the internal anal sphincter and extends proximally for a variable distance. * **B. Rectum:** The rectum is almost always involved, but in the majority of "short-segment" cases (the most common form), the involvement extends to include the sigmoid colon. * **D. Terminal ileum:** This is rare. Total colonic aganglionosis (Zuelzer-Wilson syndrome) can extend into the small bowel, but it only accounts for about 5-10% of cases. **High-Yield Clinical Pearls for NEET-PG:** * **Gold Standard Diagnosis:** Rectal Suction Biopsy (shows absence of ganglion cells and hypertrophied nerve bundles). * **Histochemistry:** Increased **Acetylcholinesterase (AChE)** staining is a classic finding. * **Clinical Presentation:** Failure to pass meconium within the first 48 hours, abdominal distension, and "blast sign" (explosive release of gas/stool) on digital rectal exam. * **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) and RET proto-oncogene mutations.

Question 27: A child with diarrhea for 2 days shows the following sign. When is it considered very slow?

A. > 2 seconds (Correct Answer)
B. > 3 seconds
C. > 4 seconds
D. > 5 seconds

Explanation: ***> 2 seconds*** - According to **WHO IMCI guidelines**, skin pinch test returning **>2 seconds** indicates **severe dehydration** and is classified as "very slow". - This threshold helps healthcare providers quickly assess **fluid loss** and determine urgent **rehydration therapy** needs in children with diarrhea. *> 3 seconds* - This exceeds the **WHO threshold** for severe dehydration, which is already established at **>2 seconds**. - Using **>3 seconds** would delay recognition of **severe dehydration** and potentially compromise timely treatment. *> 4 seconds* - This is significantly beyond the **WHO IMCI** recommended threshold for classifying severe dehydration. - Such a high threshold could lead to **underdiagnosis** of severe dehydration and delayed **emergency fluid replacement**. *> 5 seconds* - This threshold is far too high and not supported by **WHO IMCI protocols** for pediatric dehydration assessment. - Would result in **missed cases** of severe dehydration requiring immediate **intravenous rehydration** therapy.

Question 28: A 2-year-old child presents with loose stools and signs of severe dehydration. If her weight is 10 kg, what is the volume of fluid to be given in the first 3 hours?

A. 1000 ml (Correct Answer)
B. 100 ml
C. 200 ml
D. 1500 ml

Explanation: This question tests your knowledge of the **WHO Integrated Management of Neonatal and Childhood Illness (IMNCI)** guidelines for managing dehydration, specifically **Plan C** for severe dehydration. ### **Explanation of the Correct Answer** According to WHO/IMNCI guidelines, a child with **severe dehydration** requires immediate intravenous rehydration. The total fluid volume for rehydration is **100 ml/kg**. * **For children aged 12 months to 5 years:** The 100 ml/kg is divided into two phases: 1. **First 30 minutes:** 30 ml/kg 2. **Next 2.5 hours:** 70 ml/kg * **Calculation for a 10 kg child:** 100 ml/kg × 10 kg = **1000 ml**. The question asks for the volume to be given in the **first 3 hours**, which encompasses the entire 100 ml/kg bolus (30 mins + 150 mins). ### **Why the Other Options are Incorrect** * **B (100 ml):** This represents only 10 ml/kg, which is insufficient for severe dehydration and is closer to the volume used for replacing ongoing losses in Plan A. * **C (200 ml):** This represents 20 ml/kg, which is the standard bolus for initial resuscitation in hypovolemic shock but does not cover the total deficit for severe dehydration. * **D (1500 ml):** This exceeds the recommended 100 ml/kg and puts the child at risk of fluid overload and cerebral edema. ### **High-Yield Clinical Pearls for NEET-PG** * **Fluid of Choice:** Ringer’s Lactate is preferred over Normal Saline because it helps correct metabolic acidosis. * **Infants (<12 months):** Rehydration is slower. Give 30 ml/kg over 1 hour, then 70 ml/kg over 5 hours (Total 6 hours). * **Assessment:** Reassess the child every 15–30 minutes until a strong radial pulse is present. * **Plan B (Some Dehydration):** Give 75 ml/kg of ORS over 4 hours.

Question 29: Which of the following are better prognostic factors for operation of biliary duct obstruction in a newborn?

A. No passage of bile
B. Size of ductule > 200 micron (Correct Answer)
C. Weight of baby > 3 kg
D. Preterm baby

Explanation: **Explanation:** The question refers to the surgical management of **Biliary Atresia**, specifically the **Kasai Procedure (Hepatoportoenterostomy)**. The primary goal of this surgery is to establish bile flow by anastomosing the bowel to the transected fibrous cone at the porta hepatis. **Why Option B is Correct:** The success of the Kasai procedure depends heavily on the presence and size of microscopic biliary channels within the fibrous remnants at the porta hepatis. Studies (notably by Chandra and Altman) have shown that the **diameter of the largest biliary ductules** is a critical prognostic indicator. * **Ductules > 200 microns:** Associated with excellent bile drainage and a better long-term prognosis. * **Ductules < 150 microns:** Associated with poor drainage and higher failure rates of the procedure. **Analysis of Incorrect Options:** * **Option A (No passage of bile):** This is a clinical sign of complete obstruction or surgical failure; it indicates a poor prognosis, not a better one. * **Option C & D (Weight and Prematurity):** While the overall health and maturity of the baby affect surgical risk, they are not specific prognostic indicators for the success of biliary drainage compared to the histological diameter of the ductules and the **age at surgery** (the most important clinical factor). **NEET-PG High-Yield Pearls:** * **Golden Period:** The Kasai procedure should ideally be performed **before 60 days of life**. Success rates drop significantly after 90 days due to irreversible secondary biliary cirrhosis. * **Investigation of Choice:** **HIDA Scan** (demonstrates absent excretion into the bowel). * **Gold Standard Diagnosis:** Intraoperative Cholangiogram (IOC). * **Most Common Indication:** Biliary atresia is the most common indication for pediatric liver transplantation.

Question 30: A two-year-old child presents with persistent diarrhea, acidic stools, and the presence of 1% reducing substances in fresh stools. What is the most probable diagnosis?

A. Cystic fibrosis
B. Lactose intolerance (Correct Answer)
C. Rotavirus induced diarrhea
D. Intestinal tuberculosis

Explanation: ### Explanation The clinical presentation of persistent diarrhea, **acidic stools (pH < 5.5)**, and the presence of **reducing substances** (≥ 0.5%) in the stool is the classic triad for **Lactose Intolerance**. **1. Why Lactose Intolerance is Correct:** When lactose is not absorbed in the small intestine (due to primary or secondary lactase deficiency), it passes into the colon. Colonic bacteria ferment the undigested lactose, producing **Lactic acid** and **Short-Chain Fatty Acids (SCFAs)**, which lower the stool pH (acidic stools). This fermentation also produces hydrogen gas, leading to abdominal distension and flatulence. Since lactose is a reducing sugar, it reacts with Benedict’s reagent, showing positive for reducing substances. **2. Why Other Options are Incorrect:** * **Cystic Fibrosis:** Typically presents with steatorrhea (foul-smelling, oily stools) due to pancreatic insufficiency and failure to thrive, rather than isolated carbohydrate malabsorption. * **Rotavirus Diarrhea:** While it can cause secondary lactose intolerance, it is usually an acute, self-limiting watery diarrhea (3–7 days) rather than persistent diarrhea. * **Intestinal Tuberculosis:** Usually presents with chronic abdominal pain, fever, weight loss, and features of intestinal obstruction or a mass in the ileocecal region; it does not typically cause acidic stools with reducing substances. **Clinical Pearls for NEET-PG:** * **Stool pH:** Normal stool pH in infants is >6.0. pH <5.5 is highly suggestive of carbohydrate malabsorption. * **Reducing Substances:** Measured via the **Clinitest**. Note that **Sucrose** is a non-reducing sugar; if sucrose intolerance is suspected, the stool must first be hydrolyzed with HCl before testing. * **Gold Standard Diagnosis:** Hydrogen Breath Test. * **Management:** Low-lactose or lactose-free diet; in infants, continue breastfeeding but consider lactase enzyme drops.

Practice by Chapter

Gastroesophageal Reflux

Practice Questions

Peptic Ulcer Disease

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Inflammatory Bowel Disease

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Celiac Disease

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Malabsorption Syndromes

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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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