Gastroenterology Practice Questions

Q: Which of the following is NOT a gastrointestinal disturbance seen in cystic fibrosis?

Spleen infarct. **Explanation:** Cystic Fibrosis (CF) is a multisystem disorder caused by a mutation in the **CFTR gene**, leading to thick, viscid secretions that obstruct various organ ducts. While it primarily affects the lungs and the gastrointestinal tract, **splenic infarction is NOT a typical feature of CF.** **Why Spleen Infarct is the Correct Answer:** Splenic infarction is commonly associated with hematological conditions like Sickle Cell Anemia or embolic events (e.g., infective endocarditis). In CF, the spleen is usually affected secondary to **portal hypertension** (due to biliary cirrhosis), which leads to **splenomegaly** (enlargement) rather than infarction. **Analysis of Incorrect Options:** * **Biliary Cirrhosis:** Thickened bile (gallbladder sludge) causes obstruction of the intrahepatic bile ducts, leading to focal biliary cirrhosis. Over time, this can progress to multinodular cirrhosis and portal hypertension. * **Malabsorption:** This is the most common GI manifestation. Viscous secretions block pancreatic ducts, causing **exocrine pancreatic insufficiency**. This leads to fat malabsorption, steatorrhea, and deficiencies of fat-soluble vitamins (A, D, E, K). * **Gallstones:** Dehydration of bile and altered bile acid metabolism significantly increase the incidence of cholelithiasis (gallstones) in CF patients. **High-Yield Clinical Pearls for NEET-PG:** * **Meconium Ileus:** The earliest GI manifestation of CF (seen in 15-20% of newborns). * **DIOS (Distal Intestinal Obstruction Syndrome):** A unique form of constipation/obstruction seen in older CF patients. * **Rectal Prolapse:** A classic clinical sign in undiagnosed CF children due to bulky stools and poor muscle tone. * **Diagnosis:** Sweat Chloride test (>60 mEq/L) remains the gold standard.

Q: In cystic fibrosis of the pancreas, which part of the small intestine is most commonly affected?

Ileum. **Explanation:** The correct answer is **B. Ileum**. In **Cystic Fibrosis (CF)**, the primary defect lies in the **CFTR protein**, which leads to the production of abnormally thick, dehydrated, and viscid secretions. In the gastrointestinal tract, these secretions, combined with pancreatic insufficiency (lack of enzymes like trypsin), result in inspissated (thickened) meconium. The **terminal ileum** is the most common site of involvement because it is the narrowest part of the small intestine and where the meconium becomes most concentrated. This leads to **Meconium Ileus**, a classic neonatal presentation of CF characterized by intestinal obstruction. **Analysis of Incorrect Options:** * **A. Jejunum:** While the jejunum is involved in nutrient absorption, it has a wider lumen and more liquid content compared to the ileum, making it a less common site for primary obstruction in CF. * **C & D. Colon:** Although CF can lead to "Distal Intestinal Obstruction Syndrome" (DIOS) in older children (often involving the cecum/ascending colon), the hallmark pathological site specifically associated with the classic neonatal manifestation of CF is the ileum. **High-Yield Clinical Pearls for NEET-PG:** * **Meconium Ileus:** Occurs in 15-20% of CF neonates. It is often the first clinical sign of the disease. * **Radiology:** X-ray may show a "soap-bubble" appearance (Neuhauser sign) in the right lower quadrant due to air mixing with thick meconium. * **Microcolon:** On contrast enema, a "microcolon" (disuse atrophy) is often seen distal to the ileal obstruction. * **Genetics:** Most common mutation is **ΔF508** on Chromosome 7. * **Gold Standard Diagnosis:** Sweat Chloride Test (>60 mEq/L).

Q: What is the minimum duration of stool frequency and/or fluidity to define persistent diarrhea in infants?

14 days. **Explanation:** Diarrhea in children is classified based on duration into three distinct categories. The correct answer is **14 days**, as this is the standard clinical threshold defined by the World Health Organization (WHO) and pediatric guidelines to differentiate acute episodes from prolonged ones. * **Acute Diarrhea:** Lasts less than 14 days. Most cases are viral (e.g., Rotavirus) and self-limiting. * **Persistent Diarrhea:** Defined as an episode of diarrhea, with or without blood, that begins acutely but lasts for **14 days or more**. It is often associated with secondary lactose intolerance, bovine milk protein allergy, or mucosal damage leading to malabsorption. * **Chronic Diarrhea:** Typically refers to diarrhea lasting longer than **30 days (4 weeks)**, often due to non-infectious causes like Celiac disease or Inflammatory Bowel Disease (IBD). **Why other options are incorrect:** * **7 days:** This falls within the range of acute diarrhea. * **21 days:** While this is "persistent," the *minimum* duration required for the definition is 14 days. * **1 month:** This is the threshold for "Chronic Diarrhea," which usually implies a different underlying pathophysiology compared to persistent diarrhea. **High-Yield Clinical Pearls for NEET-PG:** * **Persistent Diarrhea vs. Chronic Diarrhea:** Persistent diarrhea starts as an acute infectious episode, whereas chronic diarrhea is often insidious and non-infectious. * **Management:** The mainstay of management for persistent diarrhea is nutritional rehabilitation (e.g., low-lactose diet) and Zinc supplementation. * **Mortality:** Persistent diarrhea accounts for only ~10% of diarrhea cases but contributes to nearly **35-50% of all diarrhea-related deaths** due to severe malnutrition and secondary infections.

Q: A baby born at term develops abdominal distention in the first week of life. Meconium ileus is diagnosed. Subsequently, the infant has persistent steatorrhea and fails to develop normally. Which of the following laboratory test findings is most likely related to the infant's underlying disease?

Elevated sweat chloride. **Explanation:** The clinical presentation of **Meconium Ileus** (failure to pass meconium, abdominal distention, and intestinal obstruction) in a neonate is the classic initial manifestation of **Cystic Fibrosis (CF)**. The subsequent development of **steatorrhea** (foul-smelling, oily stools) and **failure to thrive** indicates pancreatic exocrine insufficiency, where thick secretions block pancreatic ducts, preventing digestive enzymes from reaching the duodenum. **Why the correct answer is right:** Cystic Fibrosis is caused by a mutation in the **CFTR gene** (most commonly ΔF508). This defect leads to impaired chloride transport across epithelial membranes. In sweat glands, the inability to reabsorb chloride results in excessively "salty" sweat. The **Pilocarpine Iontophoresis Sweat Chloride Test** (Value >60 mmol/L) remains the gold standard for diagnosis. **Why incorrect options are wrong:** * **A. Decreased serum thyroxine:** This indicates Congenital Hypothyroidism. While it causes constipation and failure to thrive, it does not cause meconium ileus or steatorrhea. * **B. Positive HIV serology:** Pediatric HIV presents with recurrent infections and failure to thrive, but not with neonatal intestinal obstruction. * **D. Increased urine homovanillic acid (HVA):** This is a marker for **Neuroblastoma**. While it can present as an abdominal mass, it is not associated with meconium ileus or malabsorption. **NEET-PG High-Yield Pearls:** * **Meconium Ileus** is pathognomonic for CF (seen in ~15-20% of CF patients). * **Radiology:** "Soap-bubble" appearance (Neuhauser sign) in the right iliac fossa due to air mixing with thick meconium. * **Genetics:** Autosomal Recessive; CFTR gene located on **Chromosome 7**. * **Other manifestations:** Recurrent pneumonia (Pseudomonas), nasal polyps, and infertility (bilateral absence of vas deferens).

Q: An 8-year-old boy presents with a history of abdominal pain that is exacerbated during the week and lessens on weekends. His growth and development are normal. He has one soft stool daily without painful defecation. Physical examination is unremarkable, and laboratory investigations including stool for occult blood, CBC, urinalysis, and chemistry panel are within normal limits. What is the most appropriate next step in managing this patient?

Observe and reassure the patient and family. ### Explanation The clinical presentation is classic for **Functional Abdominal Pain (FAP)**, a common condition in school-aged children. The diagnosis is supported by the "Red Flag-free" history: normal growth and development, normal physical examination, and negative baseline investigations (CBC, UA, occult blood). **Why Option D is Correct:** The temporal pattern (worsening during the school week and improving on weekends) strongly suggests a **psychosocial stressor** or school-related anxiety rather than organic pathology. In a child with normal growth and no "alarm symptoms" (like weight loss, nocturnal pain, or GI bleeding), the most appropriate management is to avoid unnecessary invasive testing and provide **reassurance**. The goal is to return the child to normal activities while acknowledging that the pain is real but not life-threatening. **Why Other Options are Incorrect:** * **Options A & B:** Imaging (UGI series or CT scan) is not indicated in the absence of alarm symptoms (e.g., vomiting, palpable mass, or localized tenderness). These tests expose the child to unnecessary radiation and cost without changing management. * **Option C:** A trial of PPIs is used for suspected Gastroesophageal Reflux Disease (GERD) or Peptic Ulcer Disease. This patient’s pain is not described as epigastric or postprandial, and the weekend improvement points away from acid-peptic disease. ### NEET-PG High-Yield Pearls * **Rome IV Criteria:** Functional GI disorders are diagnosed based on clinical criteria when no organic cause is found. * **Red Flags (Indicating Organic Disease):** Persistent right upper or lower quadrant pain, dysphagia, persistent vomiting, unexplained fever, family history of IBD, and growth failure. * **Management Tip:** For functional pain, the focus is on "biopsychosocial" factors. Reassurance and maintaining a regular school routine are the first-line treatments.

Q: A 6-year-old boy presents with a 3-month history of soiling his underwear almost daily, despite being toilet trained at 2 years of age without difficulty. He has also experienced ongoing constipation for the last 2 years and frequently states, "I didn't know I had to go." He is otherwise healthy, performing well in school, and has a stable home environment. Examination reveals stool in the rectal vault. A plain radiograph of his abdomen is provided. What is the most appropriate initial management for this condition?

Disimpaction and short-term use of stool softeners. ***Disimpaction and short-term use of stool softeners*** - This is **functional encopresis with overflow incontinence** secondary to chronic constipation, requiring immediate **disimpaction** to remove the fecal impaction in the rectal vault. - **Stool softeners** (like polyethylene glycol) help maintain soft stools and prevent re-impaction while establishing regular bowel habits. *Barium enema and rectal biopsy* - These investigations are indicated for **Hirschsprung disease**, but this child was toilet trained normally at age 2, making congenital causes unlikely. - The history of **successful toilet training** and **gradual onset** of symptoms suggests functional rather than anatomical causes. *Family counseling* - While supportive care is important, **medical management** must address the underlying fecal impaction first before behavioral interventions. - Counseling alone cannot resolve the **physical obstruction** causing overflow incontinence and loss of rectal sensation. *Time-out when he soils his underwear* - **Punitive measures** are contraindicated as the child has **lost rectal sensation** due to chronic distension and cannot control the soiling. - Such approaches can worsen the condition by increasing **anxiety** and **shame** around bowel movements, perpetuating the cycle of withholding.

Q: A 2-year-old boy presented with abdominal distension, chronic diarrhoea, severe anaemia, and failure to thrive. Which of the following is the investigation of choice?

Antiendomyseal antibody. **Explanation:** The clinical presentation of chronic diarrhea, abdominal distension, failure to thrive, and severe anemia (typically iron deficiency) in a 2-year-old is highly suggestive of **Celiac Disease** (Gluten-sensitive enteropathy). **1. Why Anti-endomyseal Antibody (EMA) is correct:** Serological testing is the first-line investigation for Celiac Disease. **Anti-endomysial antibody (IgA)** is highly specific (nearly 100%) for the diagnosis. While Anti-tissue Transglutaminase (tTG) is often the preferred initial screening tool due to ease of use, EMA remains the "gold standard" serological test for confirmation. In a child with classic symptoms, positive serology is the investigation of choice to guide further management. **2. Why other options are incorrect:** * **Intestinal Biopsy:** While historically the "gold standard" for diagnosis (showing villous atrophy and crypt hyperplasia), current ESPGHAN guidelines state that in symptomatic children with very high tTG titers (>10x upper limit), a biopsy may be avoided. It is an invasive procedure and no longer the *initial* investigation of choice. * **Antinuclear Antibody (ANA):** This is a marker for systemic autoimmune diseases like SLE, which does not typically present with chronic malabsorptive diarrhea. * **Anti-milk protein antibody:** These are used in the context of Cow’s Milk Protein Allergy (CMPA). While CMPA can cause diarrhea, the triad of severe anemia, distension, and failure to thrive in a toddler is more classic for Celiac Disease. **Clinical Pearls for NEET-PG:** * **Screening Test of Choice:** IgA Anti-tissue Transglutaminase (tTG). * **Most Specific Test:** Anti-endomyseal Antibody (EMA). * **Best Initial Step in IgA Deficiency:** Check IgG-based tests (IgG-tTG or IgG-DGP). * **HLA Association:** HLA-DQ2 (95%) and HLA-DQ8. * **Biopsy Findings:** Marsh Criteria (Villous atrophy, Crypt hyperplasia, Increased Intraepithelial Lymphocytes).

Q: In congenital pyloric stenosis, which of the following is NOT typically seen?

Bile in vomitus. In **Infantile Hypertrophic Pyloric Stenosis (IHPS)**, the core pathology is the hypertrophy and hyperplasia of the muscular layers of the pylorus. This causes a mechanical obstruction at the outlet of the stomach. **Why "Bile in vomitus" is the correct answer:** The pylorus is located **proximal** to the Ampulla of Vater (where the common bile duct enters the second part of the duodenum). Because the obstruction is pre-duodenal, the gastric contents cannot mix with bile. Therefore, the hallmark of IHPS is **non-bilious vomiting**. If bile is present, the obstruction must be distal to the duodenum (e.g., duodenal atresia or malrotation). **Explanation of incorrect options:** * **Weight loss:** Due to persistent vomiting and the inability to retain calories, infants typically present with failure to thrive or significant weight loss. * **Projectile vomiting:** This is the classic presentation, usually occurring between 3–6 weeks of life. The vomiting is forceful and occurs immediately after feeding. * **Palpable pyloric mass:** An olive-shaped, firm, mobile mass can often be felt in the epigastrium or right upper quadrant, especially after the infant has vomited. **High-Yield Clinical Pearls for NEET-PG:** * **Metabolic Abnormality:** The most characteristic finding is **Hypochloremic, hypokalemic metabolic alkalosis** with paradoxical aciduria. * **Diagnosis:** Ultrasound is the investigation of choice (look for "target sign" or pyloric thickness >4mm). * **Management:** The initial priority is fluid resuscitation (Normal Saline). The definitive surgical treatment is **Ramstedt’s subserosal pyloromyotomy**. * **Demographics:** More common in first-born males; associated with maternal erythromycin use.

Question 1

Which of the following is NOT a gastrointestinal disturbance seen in cystic fibrosis?

Accepted Answer

Spleen infarct

Answer

Biliary cirrhosis

Answer

Malabsorption

Answer

Gall stones

Question 2

In cystic fibrosis of the pancreas, which part of the small intestine is most commonly affected?

Accepted Answer

Ileum

Answer

Jejunum

Answer

Ascending colon

Answer

Descending colon

Question 3

What is the minimum duration of stool frequency and/or fluidity to define persistent diarrhea in infants?

Accepted Answer

14 days

Answer

7 days

Answer

1 month

Answer

21 days

Question 4

Dehydration in a child with diarrhea, thirst present, and absent tears is classified as which of the following?

Accepted Answer

Moderate dehydration

Answer

Mild dehydration

Answer

Severe dehydration

Answer

None of the above

Question 5

A baby born at term develops abdominal distention in the first week of life. Meconium ileus is diagnosed. Subsequently, the infant has persistent steatorrhea and fails to develop normally. Which of the following laboratory test findings is most likely related to the infant's underlying disease?

Accepted Answer

Elevated sweat chloride

Answer

Decreased serum thyroxine level

Answer

Positive HIV serology

Answer

Increased urine homovanillic acid level

Question 6

An 8-year-old boy presents with a history of abdominal pain that is exacerbated during the week and lessens on weekends. His growth and development are normal. He has one soft stool daily without painful defecation. Physical examination is unremarkable, and laboratory investigations including stool for occult blood, CBC, urinalysis, and chemistry panel are within normal limits. What is the most appropriate next step in managing this patient?

Accepted Answer

Observe and reassure the patient and family

Answer

Upper gastrointestinal series with small bowel follow-through

Answer

CT scan of the abdomen with contrast

Answer

Trial of a proton pump inhibitor

Question 7

A 6-year-old boy presents with a 3-month history of soiling his underwear almost daily, despite being toilet trained at 2 years of age without difficulty. He has also experienced ongoing constipation for the last 2 years and frequently states, "I didn't know I had to go." He is otherwise healthy, performing well in school, and has a stable home environment. Examination reveals stool in the rectal vault. A plain radiograph of his abdomen is provided. What is the most appropriate initial management for this condition?

Accepted Answer

Disimpaction and short-term use of stool softeners

Answer

Barium enema and rectal biopsy

Answer

Family counseling

Answer

Time-out when he soils his underwear

Question 8

A 2-year-old boy presented with abdominal distension, chronic diarrhoea, severe anaemia, and failure to thrive. Which of the following is the investigation of choice?

Accepted Answer

Antiendomyseal antibody

Answer

Intestinal biopsy

Answer

Antinuclear antibody

Answer

Anti milk protein antibody

Question 9

In congenital pyloric stenosis, which of the following is NOT typically seen?

Accepted Answer

Bile in vomitus

Answer

Weight loss

Answer

Projectile vomiting

Answer

Palpable pyloric mass ('lump')

Question 10

A 14 kg child has severe diarrhea for 6 hours. What is the recommended fluid replacement?

Accepted Answer

1550 ml

Answer

1400 ml

Answer

1500 ml

Answer

1600 ml

Gastroenterology — MCQs

Gastroenterology — MCQs

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