Gastroenterology — MCQs

A 14-year-old boy presented with chronic diarrhea and weight loss. History reveals repeated attacks of respiratory tract infections with Pseudomonas aeruginosa. His younger brother died from a severe respiratory infection at the age of 7. Which of the following agents is most likely to improve this patient's condition?

Q67Easy

Riga-Fede disease is the ulceration seen on which of the following locations?

Q68Medium

Which metabolic disease is characterized by intestinal obstruction?

Q69Medium

In a child with acute liver failure, what is the most important abnormal serum biochemical test that indicates a poor prognosis?

Q70Medium

A 10-year-old boy presents with a 1-month history of intermittent epigastric pain that awakens him from sleep. He notes that eating food sometimes provides relief. He reports black stools over the past week and occasional vomiting of frank blood. What is the most appropriate initial diagnostic step for evaluating this patient's apparent gastrointestinal hemorrhage?

Gastroenterology Indian Medical PG Practice Questions and MCQs

Question 61: Which of the following is not a feature of infantile colic syndrome?

A. Vomiting (Correct Answer)
B. Paroxysmal symptoms
C. Abdominal pain
D. Continuous severe cry

Explanation: **Explanation:** **Infantile Colic** is a common clinical syndrome characterized by paroxysmal episodes of irritability, fussing, or crying in an otherwise healthy and well-fed infant. **Why "Vomiting" is the correct answer:** Infantile colic is a functional gastrointestinal disorder, not an organic disease. **Vomiting is NOT a feature of colic.** If an infant presents with paroxysmal crying associated with vomiting, clinicians must investigate for organic causes such as Gastroesophageal Reflux Disease (GERD), intestinal malrotation, or intussusception. The presence of "red flags" like vomiting, fever, or poor weight gain excludes a diagnosis of infantile colic. **Analysis of incorrect options:** * **Paroxysmal symptoms:** Colic is defined by its sudden onset and cessation. The episodes often occur in the evening without an identifiable trigger. * **Abdominal pain:** During episodes, infants often appear to be in pain, characterized by a flushed face, clenched fists, and drawing up of the legs toward the abdomen (suggesting abdominal discomfort/gas). * **Continuous severe cry:** The hallmark of the syndrome is intense, inconsolable crying that lasts for hours. **High-Yield Clinical Pearls for NEET-PG:** * **Wessel’s Rule of Three:** Diagnosis is made if crying lasts **>3 hours/day**, occurs **>3 days/week**, for **>3 weeks**. * **Timeline:** Symptoms typically start at 2–3 weeks of age, peak at 6 weeks, and usually resolve by **3–4 months** of age ("Evening Colic"). * **Management:** Reassurance of parents is the mainstay. Dietary modifications (if breastfeeding) or switching to hydrolyzed formulas may be tried, but pharmacological agents like Simethicone have limited proven efficacy. Dicyclomine is **contraindicated** in infants <6 months due to the risk of apnea.

Question 62: What is the most common age for intussusception?

A. 0-6 months
B. 6 months - 3 years (Correct Answer)
C. 3-5 years
D. Greater than 5 years

Explanation: **Explanation:** **Intussusception** is the most common cause of intestinal obstruction in infants and young children. It occurs when one segment of the intestine (the intussusceptum) telescopes into an adjacent segment (the intussuscipiens). **Why Option B is Correct:** The peak incidence of intussusception occurs between **6 months and 3 years of age** (specifically 5–9 months). In this age group, the vast majority of cases (90%) are **idiopathic**. The leading theory suggests that viral infections (like Adenovirus) cause hypertrophy of **Peyer’s patches** in the terminal ileum, which then act as a physiological lead point for telescoping. **Why Other Options are Incorrect:** * **Option A (0-6 months):** While it can occur, it is rare in the early neonatal period. If it occurs in very young infants, clinicians must maintain a higher suspicion for anatomical lead points. * **Options C & D (>3 years):** Intussusception becomes less common as children age. In children older than 5 years, an **anatomical lead point** (such as Meckel’s diverticulum, polyp, lymphoma, or HSP-related submucosal hemorrhage) is found in up to 75% of cases. **NEET-PG High-Yield Pearls:** * **Most common site:** Ileocolic. * **Classic Triad:** Intermittent abdominal pain (colicky), "Sausage-shaped" mass (usually in the right upper quadrant), and **Red currant jelly stools**. * **Diagnosis:** Ultrasound is the gold standard (shows **Target/Donut sign** or Pseudokidney sign). * **Treatment:** Non-operative reduction using **Air or Hydrostatic (Barium/Saline) enema** is the first-line treatment if there are no signs of perforation or peritonitis.

Question 63: A 1-year-old infant presents with 10-12 episodes of watery stools per day for the last 9 days. Along with zinc supplementation, what else should be prescribed to the child?

A. Oral rehydration solution (ORS) with antibiotics
B. Oral rehydration solution (ORS) only (Correct Answer)
C. Oral rehydration solution (ORS) with a low-lactose diet
D. Oral rehydration solution (ORS) with a low-lactose diet and probiotics

Explanation: ### Explanation The core management of acute watery diarrhea in children, as per **WHO and IAP guidelines**, focuses on preventing dehydration and replacing lost electrolytes. **1. Why Option B is Correct:** The child is presenting with **Acute Watery Diarrhea** (duration <14 days). The standard of care is **Low Osmolarity ORS** to prevent/treat dehydration and **Zinc supplementation** (20 mg/day for 14 days) to reduce the duration and severity of the episode. Most cases of acute watery diarrhea are viral (e.g., Rotavirus); therefore, rehydration is the definitive treatment. **2. Why Other Options are Incorrect:** * **Option A (Antibiotics):** Routine use of antibiotics is contraindicated in watery diarrhea. They are only indicated in cases of **bloody diarrhea (Dysentery)**, suspected **Cholera** with severe dehydration, or associated systemic infections. * **Option C & D (Low-lactose diet/Probiotics):** * Most children tolerate lactose well during acute diarrhea. A lactose-free diet is only considered in **Persistent Diarrhea (>14 days)** if there are clinical signs of lactose intolerance (e.g., perianal excoriation, acidic stools). * While **Probiotics** (like *Lactobacillus rhamnosus GG*) may marginally reduce the duration of diarrhea, they are not part of the essential WHO/IAP protocol for standard management. **Clinical Pearls for NEET-PG:** * **Low Osmolarity ORS:** Total osmolarity is **245 mOsm/L** (Sodium: 75 mmol/L, Glucose: 75 mmol/L). * **Zinc Dosage:** <6 months = 10 mg/day; >6 months = 20 mg/day for 14 days. * **Persistent Diarrhea:** Diarrhea lasting >14 days (requires nutritional management like the Reduced Lactose/A-B-C diet). * **Drug of choice for Shigellosis (Dysentery):** Ceftriaxone or Azithromycin (due to widespread Ciprofloxacin resistance).

Question 64: Which of the following is NOT an organic cause of constipation in an infant?

A. High fibre diet (Correct Answer)
B. Cystic fibrosis
C. Hypothyroidism
D. Hyperthyroidism

Explanation: **Explanation:** In pediatric practice, constipation is classified into **Functional** (95% of cases) and **Organic** (5% of cases). This question requires distinguishing between systemic/pathological causes and dietary factors. **Why Option A is Correct:** A **High-fibre diet** is actually a **treatment** for functional constipation, not a cause. In contrast, a *low-fibre* diet or excessive cow’s milk intake are common triggers for functional constipation. Since it is a dietary habit and not a structural or metabolic disease, it is not considered an "organic" cause. **Analysis of Incorrect Options:** * **B. Cystic Fibrosis:** This is a classic organic cause. In infants, it can present as **Meconium Ileus** or Distal Intestinal Obstruction Syndrome (DIOS) due to thick, inspissated secretions in the gut. * **C. Hypothyroidism:** Low thyroid hormone levels slow down basal metabolism and gut motility (decreased peristalsis), leading to significant constipation in neonates and infants. * **D. Hyperthyroidism:** This is the **incorrectly labeled distractor** in the original options. Pathologically, Hyperthyroidism typically causes *increased* frequency of bowel movements or diarrhea. However, in the context of this specific MCQ format, "High fibre diet" is the most definitive "non-organic" factor, as it is a therapeutic intervention. **NEET-PG High-Yield Pearls:** * **Most common cause of constipation in children:** Functional (Behavioral/Dietary). * **Hirschsprung Disease:** The most common structural organic cause; characterized by a lack of ganglion cells in the myenteric plexus. * **Red Flags for Organic Constipation:** Failure to pass meconium within 48 hours, ribbon-like stools, failure to thrive, and empty rectum on digital examination. * **Metabolic causes to remember:** Hypothyroidism, **Hypercalcemia**, and Hypokalemia.

Question 65: A child is passing blood with the act of defecation. What is the probable diagnosis?

A. Juvenile rectal polyp (Correct Answer)
B. Adenomatous Polyposis
C. Rectal ulcer
D. Post surgery

Explanation: **Explanation:** The clinical presentation of painless, bright red rectal bleeding (hematochezia) during or after defecation in a child is the classic hallmark of a **Juvenile Rectal Polyp**. **1. Why Juvenile Rectal Polyp is correct:** Juvenile polyps are the most common cause of lower gastrointestinal bleeding in the pediatric age group (typically aged 2–10 years). These are **hamartomatous** lesions, usually solitary and pedunculated, located in the rectosigmoid region. Because they are highly vascular and prone to torsion or surface erosion during the passage of stool, they present with intermittent, painless fresh streaks of blood on the stool. **2. Why the other options are incorrect:** * **Adenomatous Polyposis:** These are neoplastic polyps (e.g., Familial Adenomatous Polyposis) that are rare in early childhood and carry a high risk of malignancy. They usually present in late adolescence or early adulthood. * **Rectal Ulcer:** Solitary rectal ulcers are less common in children and are often associated with chronic constipation or straining (rectal prolapse). They typically present with mucus discharge and tenesmus rather than isolated painless bleeding. * **Post-surgery:** While postoperative bleeding can occur, it requires a specific surgical history (e.g., pull-through for Hirschsprung’s) and is not a "probable diagnosis" for a general presentation of hematochezia. **Clinical Pearls for NEET-PG:** * **Most common site:** Rectosigmoid (80-90%). * **Nature:** Hamartomatous (not premalignant). * **Diagnosis:** Digital Rectal Examination (DRE) can often palpate low-lying polyps; Proctosigmoidoscopy is the gold standard for visualization. * **Treatment:** Colonoscopic polypectomy is the treatment of choice. * **Juvenile Polyposis Syndrome:** Defined by >5 polyps or a family history; unlike solitary polyps, this syndrome carries an increased risk of GI malignancy.

Question 66: A 14-year-old boy presented with chronic diarrhea and weight loss. History reveals repeated attacks of respiratory tract infections with Pseudomonas aeruginosa. His younger brother died from a severe respiratory infection at the age of 7. Which of the following agents is most likely to improve this patient's condition?

A. Octreotide
B. Pancreatic lipase (Correct Answer)
C. Metronidazole
D. Loperamide

Explanation: ### **Explanation** **Diagnosis: Cystic Fibrosis (CF)** The clinical triad of **chronic diarrhea** (steatorrhea), **weight loss**, and **recurrent *Pseudomonas* respiratory infections**, combined with a positive family history (sibling death), strongly points toward Cystic Fibrosis. In CF, a defect in the CFTR protein leads to thick, viscous secretions. This causes **Exocrine Pancreatic Insufficiency (EPI)** because inspissated secretions block the pancreatic ducts, preventing digestive enzymes from reaching the duodenum. This results in malabsorption of fats and fat-soluble vitamins (A, D, E, K). **Pancreatic lipase** (as part of Pancreatic Enzyme Replacement Therapy - PERT) is the mainstay of treatment to improve digestion, resolve diarrhea, and promote weight gain. --- ### **Analysis of Options** * **A. Octreotide:** A somatostatin analog used for secretory diarrheas (like VIPoma or Carcinoid syndrome) and variceal bleeding. It would actually worsen fat malabsorption by inhibiting pancreatic secretion. * **C. Metronidazole:** Used for anaerobic infections or protozoal infections like Giardiasis. While CF patients may have Small Intestinal Bacterial Overgrowth (SIBO), it does not address the primary cause of chronic malabsorption in CF. * **D. Loperamide:** An anti-motility agent used for symptomatic relief of acute non-specific diarrhea. It is contraindicated in CF as it does not treat the underlying enzyme deficiency and can increase the risk of Distal Intestinal Obstruction Syndrome (DIOS). --- ### **High-Yield Pearls for NEET-PG** * **Gold Standard Diagnosis:** Sweat Chloride Test (>60 mEq/L). * **Genetics:** Autosomal Recessive; most common mutation is **ΔF508** on Chromosome 7. * **Gastrointestinal Manifestations:** Meconium ileus (newborns), Rectal prolapse, Biliary cirrhosis, and DIOS. * **Microbiology:** *Staphylococcus aureus* is the most common lung pathogen in early childhood; ***Pseudomonas aeruginosa*** becomes dominant in older children and adults. * **Infertility:** 95% of males are infertile due to Congenital Bilateral Absence of the Vas Deferens (CBAVD).

Question 67: Riga-Fede disease is the ulceration seen on which of the following locations?

A. Attached gingiva
B. Buccal mucosa
C. Lower lip
D. Tongue (Correct Answer)

Explanation: **Explanation:** **Riga-Fede disease** is a rare benign condition characterized by traumatic ulceration on the ventral surface of the **tongue**. It is most commonly caused by repetitive trauma from **natal or neonatal teeth** (teeth present at birth or erupting within the first month) during breastfeeding or tongue protrusion. * **Why Option D is Correct:** The ulceration typically occurs on the **ventral (under) surface of the tongue** or the frenulum. As the infant suckles, the tongue is positioned over the sharp incisal edges of the erupting mandibular teeth, leading to chronic mechanical trauma, inflammation, and eventual ulcer formation. * **Why Options A, B, and C are Incorrect:** While these sites are common for other oral pathologies (e.g., aphthous ulcers on buccal mucosa or primary herpetic gingivostomatitis on gingiva), they are not the primary sites for Riga-Fede disease. The mechanism of this specific disease is strictly linked to the anatomical contact point between the tongue and the lower incisors. **Clinical Pearls for NEET-PG:** * **Associated Conditions:** While often isolated, it can be associated with underlying neurodevelopmental disorders (e.g., Lesch-Nyhan syndrome or Familial Dysautonomia) where repetitive self-mutilation or lack of pain sensation occurs. * **Management:** Conservative management is preferred (smoothing the sharp edges of the teeth or using a protective shield). Extraction is a last resort and only indicated if the tooth is hypermobile (risk of aspiration) or if the ulcer prevents adequate feeding. * **Key Differential:** Always differentiate from Eosinophilic Ulcer (Granuloma), which may appear similar histologically.

Question 68: Which metabolic disease is characterized by intestinal obstruction?

A. Hereditary fructose intolerance
B. Phenylketonuria
C. Hurler disease
D. Cystic fibrosis (Correct Answer)

Explanation: **Explanation:** **Cystic Fibrosis (CF)** is the correct answer because it is a multi-system genetic disorder caused by a mutation in the **CFTR gene**, leading to thick, viscid secretions. In the gastrointestinal tract, these inspissated secretions cause intestinal obstruction at different stages of life: * **Neonates:** Presents as **Meconium Ileus** (the earliest clinical manifestation of CF), where thick meconium obstructs the terminal ileum. * **Older children/Adults:** Presents as **Distal Intestinal Obstruction Syndrome (DIOS)**, characterized by fecal impaction in the ileocecal region. **Analysis of Incorrect Options:** * **A. Hereditary Fructose Intolerance:** This is a defect in Aldolase B. It presents with hypoglycemia, vomiting, and jaundice after ingesting fructose (fruit/sucrose), but does not cause mechanical obstruction. * **B. Phenylketonuria (PKU):** A defect in Phenylalanine Hydroxylase. It presents with intellectual disability, seizures, and a "mousy" body odor, not gastrointestinal obstruction. * **C. Hurler Disease (MPS I):** A lysosomal storage disorder. While it causes organomegaly (hepatosplenomegaly) and macroglossia, it does not typically present with intestinal obstruction. **High-Yield Clinical Pearls for NEET-PG:** * **Meconium Ileus** is pathognomonic for CF (seen in ~15-20% of cases). * **Microcolon** is a classic finding on contrast enema in neonates with meconium ileus. * **Sweat Chloride Test** remains the gold standard for diagnosis (Value >60 mEq/L). * **Rectal Prolapse** is a common GI complication of CF in early childhood due to bulky stools and malnutrition.

Question 69: In a child with acute liver failure, what is the most important abnormal serum biochemical test that indicates a poor prognosis?

A. Increasing transaminases
B. Increasing bilirubin
C. Increasing prothrombin time
D. None of the above (Correct Answer)

Explanation: In Pediatric Acute Liver Failure (PALF), the prognosis is determined by the liver's synthetic function and the degree of encephalopathy, rather than the absolute value of any single biochemical test. **Why "None of the Above" is correct:** The most important prognostic indicator in PALF is the **Prothrombin Time (PT) or International Normalized Ratio (INR) that fails to improve with Vitamin K administration.** However, the question asks for the most important *abnormal* test indicating a poor prognosis. In clinical practice, the **dynamic trend** (e.g., a rising INR coupled with falling transaminases) is more significant than a single static value. Furthermore, the most reliable prognostic markers are often composite scores (like the King’s College Criteria) or the presence of **Grade III/IV Hepatic Encephalopathy**, which is a clinical finding, not a biochemical test. **Analysis of Incorrect Options:** * **A. Increasing Transaminases:** These reflect acute hepatocyte injury. Ironically, a rapid *decrease* in transaminases alongside a rising bilirubin/INR (the "crashing" liver) is a more ominous sign, indicating a lack of viable hepatocytes remaining. * **B. Increasing Bilirubin:** While high bilirubin is a component of many scoring systems, it is a late marker and less sensitive than PT/INR for predicting immediate mortality or the need for transplant. * **C. Increasing Prothrombin Time:** While PT is the best marker of synthetic function, an "increasing" PT alone is not the most definitive prognosticator unless it is **refractory to Vitamin K** or part of a multi-organ failure assessment. **High-Yield Clinical Pearls for NEET-PG:** * **Definition of PALF:** Evidence of liver injury + INR >1.5 (with encephalopathy) OR INR >2.0 (without encephalopathy). * **Best Marker of Synthetic Function:** Serum Albumin (Long-term/Chronic) vs. **PT/INR (Short-term/Acute)** due to the short half-life of Factor VII. * **The "Ominous Triad":** Falling transaminases + Rising Bilirubin + Shrinking liver span (indicates massive hepatic necrosis). * **King's College Criteria:** The gold standard for determining the need for liver transplantation in ALF.

Question 70: A 10-year-old boy presents with a 1-month history of intermittent epigastric pain that awakens him from sleep. He notes that eating food sometimes provides relief. He reports black stools over the past week and occasional vomiting of frank blood. What is the most appropriate initial diagnostic step for evaluating this patient's apparent gastrointestinal hemorrhage?

A. Abdominal series X-ray
B. Fiberoptic endoscopy (Correct Answer)
C. Apt test
D. Routine stool culture

Explanation: **Explanation:** The clinical presentation of epigastric pain relieved by food, nocturnal awakening, and signs of upper gastrointestinal bleeding (UGIB) such as hematemesis and melena (black stools) is highly suggestive of **Peptic Ulcer Disease (PUD)**, likely a duodenal ulcer. 1. **Why Fiberoptic Endoscopy is correct:** **Esophagogastroduodenoscopy (EGD)** is the gold standard and most appropriate initial diagnostic step for evaluating UGIB. It is both **diagnostic** (allows direct visualization of ulcers, gastritis, or varices) and potentially **therapeutic** (allows for hemostasis via clipping, cautery, or injection). In children, PUD is a significant cause of chronic abdominal pain and GI bleeding, requiring definitive visualization. 2. **Why the other options are incorrect:** * **Abdominal series X-ray:** This is primarily used to rule out intestinal obstruction or perforation (pneumoperitoneum). It cannot visualize mucosal lesions like ulcers or identify the source of bleeding. * **Apt test:** This test is used to differentiate between swallowed maternal blood and neonatal gastrointestinal blood in newborns. It is irrelevant in a 10-year-old child. * **Routine stool culture:** This is used to evaluate infectious diarrhea (e.g., *Salmonella*, *Shigella*). While some infections cause hematochezia (bright red blood), they do not present with hematemesis or classic peptic symptoms. **High-Yield Clinical Pearls for NEET-PG:** * **Most common cause of UGIB in children:** Gastritis and PUD are common, but always consider **Extrahepatic Portal Venous Obstruction (EHPVO)** leading to esophageal varices in the Indian context. * **Duodenal vs. Gastric Ulcer:** Pain relieved by food is characteristic of duodenal ulcers, while pain aggravated by food is typical of gastric ulcers. * **H. pylori:** This is a major risk factor for PUD in children; diagnosis can be made during endoscopy via a Rapid Urease Test (RUT) or biopsy.

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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