Gastroenterology Practice Questions

Q: A 12-year-old boy presented with abdominal pain. What is the most likely diagnosis?

Peutz-Jeghers syndrome. ***Peutz-Jeghers syndrome*** - **Hamartomatous polyps** in the gastrointestinal tract commonly cause **intussusception** and abdominal pain in children, making this the most likely diagnosis. - Characterized by **perioral melanotic pigmentation** (dark spots around the lips and mouth) which is pathognomonic for this condition. *Cowden syndrome* - Primarily presents with **multiple hamartomas** affecting skin, thyroid, breast, and endometrium, not typically causing abdominal pain in children. - Associated with **PTEN gene mutations** and increased risk of **breast and thyroid cancers** in adulthood. *Cronkhite-Canada syndrome* - A **non-hereditary** polyposis syndrome that typically affects **adults over 50 years**, making it unlikely in a 12-year-old. - Characterized by **alopecia**, **nail dystrophy**, and **hyperpigmentation** along with GI polyps. *Osler-Weber-Rendu syndrome* - Also known as **hereditary hemorrhagic telangiectasia (HHT)**, primarily causes **recurrent nosebleeds** and **telangiectasias**. - Does not typically present with **abdominal pain** as the primary symptom in children.

Q: Which of the following is the most sensitive indicator of intravascular volume depletion in an infant presented with acute rotavirus gastroenteritis?

Heart rate. **Explanation:** In infants and young children, the **heart rate** is the most sensitive and earliest clinical indicator of intravascular volume depletion (dehydration). **1. Why Heart Rate is Correct:** The pediatric cardiovascular system is characterized by a relatively non-compliant left ventricle and a fixed stroke volume. Unlike adults, infants cannot significantly increase their stroke volume to compensate for fluid loss. Therefore, to maintain **Cardiac Output (CO = Heart Rate × Stroke Volume)** during hypovolemia, the infant’s body relies almost exclusively on increasing the heart rate (tachycardia). Tachycardia often precedes other signs like hypotension, which is a late and ominous sign of shock in children. **2. Why Other Options are Incorrect:** * **Cardiac Output:** This is a calculated parameter (HR × SV). While it eventually falls in severe dehydration, it is maintained initially by compensatory tachycardia, making it less sensitive than the heart rate itself. * **Stroke Volume:** In infants, the stroke volume is relatively fixed due to limited ventricular compliance. It decreases as preload drops, but it is not a "sensitive indicator" that can be easily measured or used clinically to detect early depletion. * **Preload:** While intravascular volume depletion directly reduces preload, it is a hemodynamic state rather than a clinical "indicator" easily assessed at the bedside in an emergency setting. **Clinical Pearls for NEET-PG:** * **Earliest Sign of Dehydration:** Tachycardia. * **Most Reliable Sign of Dehydration:** Prolonged capillary refill time (CRT), abnormal skin turgor, and abnormal breathing patterns. * **Late Sign of Dehydration:** Hypotension (indicates uncompensated shock). * **Best Objective Indicator of Dehydration Severity:** Percentage of body weight loss.

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

Vomiting. **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.

Q: What is the most common age for intussusception?

6 months - 3 years. **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.

Q: 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?

Oral rehydration solution (ORS) only. ### 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 = 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).

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

High fibre diet. **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.

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

Tongue. **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.

Q: Which metabolic disease is characterized by intestinal obstruction?

Cystic fibrosis. **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 1

A 12-year-old boy presented with abdominal pain. What is the most likely diagnosis?

Accepted Answer

Peutz-Jeghers syndrome

Answer

Cowden syndrome

Answer

Cronkhite-Canada syndrome

Answer

Osler-Weber-Rendu syndrome

Question 2

Which of the following is the most sensitive indicator of intravascular volume depletion in an infant presented with acute rotavirus gastroenteritis?

Accepted Answer

Heart rate

Answer

Cardiac output

Answer

Stroke volume

Answer

Preload

Question 3

Reye's syndrome is characterized by which of the following findings?

Accepted Answer

Viral infection is seen

Answer

Presents as deep jaundice

Answer

Cerebral edema

Answer

Microvesicular fatty infiltration

Question 4

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

Accepted Answer

Vomiting

Answer

Paroxysmal symptoms

Answer

Abdominal pain

Answer

Continuous severe cry

Question 5

What is the most common age for intussusception?

Accepted Answer

6 months - 3 years

Answer

0-6 months

Answer

3-5 years

Answer

Greater than 5 years

Question 6

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?

Accepted Answer

Oral rehydration solution (ORS) only

Answer

Oral rehydration solution (ORS) with antibiotics

Answer

Oral rehydration solution (ORS) with a low-lactose diet

Answer

Oral rehydration solution (ORS) with a low-lactose diet and probiotics

Question 7

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

Accepted Answer

High fibre diet

Answer

Cystic fibrosis

Answer

Hypothyroidism

Answer

Hyperthyroidism

Question 8

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?

Accepted Answer

Pancreatic lipase

Answer

Octreotide

Answer

Metronidazole

Answer

Loperamide

Question 9

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

Accepted Answer

Tongue

Answer

Attached gingiva

Answer

Buccal mucosa

Answer

Lower lip

Question 10

Which metabolic disease is characterized by intestinal obstruction?

Accepted Answer

Cystic fibrosis

Answer

Hereditary fructose intolerance

Answer

Phenylketonuria

Answer

Hurler disease

Gastroenterology — MCQs

Gastroenterology — MCQs

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