Gastroenterology Practice Questions

Q: Parents bring their infant to the clinic, seeking treatment for vomiting and diarrhoea that has lasted for 2 days. On assessment, the nurse in charge detects dry mucous membranes and lethargy. What other findings suggest a fluid volume deficit?

A sunken fontanel. ### **Explanation** The clinical presentation of vomiting, diarrhea, dry mucous membranes, and lethargy in an infant points toward **Dehydration (Isotonic or Hypotonic)**. In infants, the anterior fontanel is a key clinical window for assessing hydration status. **1. Why "A sunken fontanel" is correct:** In infants, the anterior fontanel normally feels flat and firm. When there is a significant fluid volume deficit (Dehydration), the intracranial pressure decreases due to reduced intravascular and interstitial fluid. This causes the fontanel to dip below the level of the skull bones, appearing "sunken." This is a hallmark sign of **moderate to severe dehydration** (typically >5-10% fluid loss). **2. Why the other options are incorrect:** * **B. Decreased pulse rate:** Dehydration typically causes **Tachycardia** (increased heart rate) as a compensatory mechanism to maintain cardiac output despite low stroke volume. Bradycardia is a late, pre-terminal sign of circulatory collapse. * **C. Increased blood pressure:** Fluid volume deficit leads to **Hypotension** (low blood pressure). However, in infants, BP is often maintained until the late stages of shock due to strong compensatory vasoconstriction. * **D. Low urine specific gravity:** In dehydration, the kidneys conserve water, leading to oliguria and **High urine specific gravity** (>1.025) as the urine becomes highly concentrated. **3. NEET-PG High-Yield Pearls:** * **Best indicator of dehydration severity:** Percentage of body weight loss. * **Earliest clinical sign:** Tachycardia and dry mouth. * **WHO Classification:** Focuses on "Some Dehydration" (irritable, sunken eyes, thirsty, skin pinch goes back slowly) vs. "Severe Dehydration" (lethargic/unconscious, unable to drink, skin pinch goes back very slowly >2 seconds). * **Management:** "Some dehydration" is treated with ORS (Plan B); "Severe dehydration" requires IV Ringer’s Lactate (Plan C).

Q: What is the duration considered for persistent diarrhea in infants?

14 days. **Explanation:** The classification of diarrhea is based on the duration of symptoms, which is a critical clinical marker for determining the underlying pathophysiology and management strategy. **1. Why 14 days is correct:** According to the World Health Organization (WHO) and Integrated Management of Neonatal and Childhood Illness (IMNCI) guidelines, **Persistent Diarrhea** is defined as an episode of diarrhea that begins acutely but lasts for **14 days or more**. This duration is clinically significant because prolonged diarrhea often leads to secondary malabsorption (such as lactose intolerance), severe dehydration, and malnutrition, requiring specific nutritional rehabilitation and monitoring. **2. Analysis of Incorrect Options:** * **7 days (Option A):** While a week is a significant duration, it falls under the category of "Acute Diarrhea." Most viral or bacterial gastroenteritis cases resolve within 3–7 days. * **21 days (Option C):** This is an arbitrary number. While a patient with 21 days of diarrhea is technically "persistent," the diagnostic threshold for intervention and classification starts at 14 days. * **1 month (Option D):** Diarrhea lasting more than 30 days is often referred to as **Chronic Diarrhea**. Unlike persistent diarrhea (which starts as an acute infectious episode), chronic diarrhea is more likely due to non-infectious causes like Celiac disease, Inflammatory Bowel Disease (IBD), or cystic fibrosis. **High-Yield Clinical Pearls for NEET-PG:** * **Acute Diarrhea:** Lasts 30 days (usually non-infectious/malabsorptive). * **Key Management:** For persistent diarrhea, the focus shifts from just rehydration to **nutritional management** (e.g., Vitamin A supplementation and a reduced-lactose diet). * **Dysentery:** Defined by the presence of visible **blood in stools**, regardless of the duration.

Q: What is the commonest cause of vomiting in a one-month-old infant?

Aerophagy. **Explanation:** **Correct Answer: C. Aerophagy** **Medical Concept:** Aerophagy, or the swallowing of air during feeding, is the **most common** cause of vomiting (specifically physiological spitting up) in early infancy. It occurs due to improper feeding techniques, such as a poor latch during breastfeeding or using a bottle nipple with an incorrect flow rate. The swallowed air distends the stomach, and as the infant attempts to belch, a small amount of milk is regurgitated. It is a benign, self-limiting condition that improves with proper burping and feeding posture. **Analysis of Incorrect Options:** * **A. Pyloric Stenosis:** While a classic cause of vomiting in this age group (typically 3–6 weeks), it presents with **non-bilious, projectile vomiting** and is far less frequent than simple aerophagy. * **B. Cardiac Chalasia:** This refers to the transient relaxation of the lower esophageal sphincter (LES). While it causes "spitting up," it is considered a component of the spectrum of GERD rather than the most common overall cause. * **C. Gastro-esophageal Reflux (GER):** Physiological GER is very common in infants (often called "happy spitters"); however, aerophagy remains the more frequent underlying mechanical trigger for vomiting episodes in the general neonatal and early infancy population. **High-Yield Clinical Pearls for NEET-PG:** * **Most common cause of vomiting in infants:** Aerophagy. * **Most common surgical cause of vomiting (3–6 weeks):** Hypertrophic Pyloric Stenosis (HPS). * **Metabolic abnormality in HPS:** Hypochloremic, hypokalemic metabolic alkalosis with paradoxical aciduria. * **Management of Aerophagy:** Frequent burping, ensuring the nipple is full of milk during bottle feeding, and upright positioning after feeds.

Q: True about the concentration of Oral Rehydration Solution is:

Potassium 20 mEq/lit. The question focuses on the composition of the **WHO Reduced Osmolarity ORS**, which has been the standard recommendation since 2002 to reduce the need for unscheduled IV fluids and decrease stool output. ### Why Option B is Correct The concentration of **Potassium in ORS is 20 mEq/L**. Potassium is added as Potassium Chloride to replace the significant fecal losses of potassium during diarrhea, thereby preventing hypokalemia and associated complications like paralytic ileus and muscle weakness. ### Why Other Options are Incorrect * **A. Sodium (75 mEq/L):** In the reduced osmolarity formula, the Sodium concentration is **75 mEq/L**, not 70. The older "Standard ORS" had 90 mEq/L, but 75 mEq/L is now preferred to avoid hypernatremia. * **C. Bicarbonate (None):** Modern ORS uses **Trisodium Citrate (10 mmol/L)** instead of Bicarbonate. Citrate is more stable in tropical climates and is converted to bicarbonate in the body to correct acidosis. * **D. Chloride (65 mEq/L):** The chloride concentration in reduced osmolarity ORS is **65 mEq/L**, not 30. ### High-Yield Facts for NEET-PG To master ORS-related questions, remember the **"75-65-20-10-75"** rule for Reduced Osmolarity ORS: 1. **Sodium:** 75 mEq/L 2. **Chloride:** 65 mEq/L 3. **Potassium:** 20 mEq/L 4. **Citrate:** 10 mmol/L 5. **Glucose:** 75 mmol/L 6. **Total Osmolarity:** **245 mOsm/L** (Standard ORS was 311 mOsm/L). **Clinical Pearl:** The glucose-to-sodium ratio is kept at **1:1** to optimize the SGLT-1 (Sodium-Glucose Luminal Transporter) mechanism in the small intestine, which facilitates the coupled absorption of sodium and water even during secretory diarrhea.

Q: Which of the following is not a reliable indicator of dehydration?

Skin turgor. **Explanation:** In pediatric clinical practice, assessing the severity of dehydration is crucial. The correct answer is **Skin Turgor** because, while it is a classic sign, it is considered **unreliable** in specific clinical scenarios common in exams. 1. **Why Skin Turgor is unreliable:** Skin turgor (the "pinch test") depends on the elastic properties of the subcutaneous tissue. It can be falsely normal in **hypernatremic (hypertonic) dehydration**, where intracellular fluid shifts to the extracellular space, maintaining skin turgor despite significant total body water loss. Conversely, it can be falsely prolonged in children with **severe malnutrition (Marasmus)** due to the loss of subcutaneous fat, even without dehydration. 2. **Analysis of Incorrect Options:** * **Dry Buccal Mucosa:** This is a highly sensitive clinical indicator. A moist tongue and mucous membranes generally rule out significant dehydration. * **Oliguria:** As dehydration progresses, the body compensates via the Renin-Angiotensin-Aldosterone System (RAAS) and ADH to conserve water, making decreased urine output a consistent physiological marker of fluid deficit. * **Thirst:** This is one of the earliest signs of dehydration (especially in Isonatremic/Hypernatremic states) as the osmoreceptors in the hypothalamus are stimulated. **Clinical Pearls for NEET-PG:** * **Most sensitive sign** of dehydration: **Weight loss** (if pre-illness weight is known). * **Best clinical predictor** of >5% dehydration: **Prolonged Capillary Refill Time (CRT)**, abnormal skin turgor, and abnormal breathing patterns. * **Hypernatremic Dehydration:** Characterized by a "doughy" or "velvety" feel to the skin rather than a simple loss of turgor. * **Sunken Fontanelle:** A reliable sign of dehydration in infants before the closure of the anterior fontanelle.

Q: A 6-year-old boy presents with a palpable abdominal mass in the epigastrium. There is no bile in the vomitus. What is the clinical diagnosis?

Pyloric stenosis. **Explanation:** The clinical diagnosis is **Infantile Hypertrophic Pyloric Stenosis (IHPS)**. The hallmark of this condition is gastric outlet obstruction due to hypertrophy of the pyloric sphincter. **Why Pyloric Stenosis is correct:** 1. **Non-bilious vomiting:** Because the obstruction is proximal to the Ampulla of Vater (where bile enters the duodenum), the vomitus never contains bile. 2. **Epigastric Mass:** The hypertrophied pylorus is often palpable as a firm, mobile, "olive-shaped" mass in the epigastrium or right upper quadrant. 3. **Age Factor:** While typically presenting at 3–6 weeks of life, late presentations can occur. (Note: In the context of standard PG exams, non-bilious vomiting + palpable epigastric mass is the classic triad for IHPS). **Why other options are incorrect:** * **Duodenal Atresia:** Characterized by **bilious vomiting** (as most atresias occur distal to the Ampulla of Vater) and the "double bubble" sign on X-ray. It presents within the first 24–48 hours of life. * **Choledochal Cyst:** While it presents with a palpable mass and jaundice, it does not typically cause gastric outlet obstruction or projectile vomiting. * **Esophageal Atresia:** Presents immediately after birth with drooling, choking, and cyanosis during feeding. The obstruction is proximal to the stomach, so no abdominal mass is palpable. **High-Yield Clinical Pearls for NEET-PG:** * **Metabolic Abnormality:** Hypochloremic, hypokalemic metabolic alkalosis with paradoxical aciduria. * **Investigation of Choice:** Ultrasonography (Criteria: Pyloric muscle thickness >4mm or length >14mm). * **Barium Swallow Sign:** "String sign" or "Beak sign." * **Management:** Initial resuscitation with Normal Saline (0.9%), followed by **Ramstedt’s Pyloromyotomy**.

Q: Which of the following statements is true about the new WHO oral rehydration solution (ORS) formula?

All of the above.. The correct answer is **D. All of the above.** ### **Explanation** The World Health Organization (WHO) and UNICEF transitioned from the standard high-osmolarity ORS to the **Reduced Osmolarity ORS** in 2004. This change was implemented to reduce the risk of hypernatremia and to decrease the need for unscheduled intravenous fluids, stool output, and the incidence of vomiting in children with non-cholera diarrhea. 1. **Sodium Concentration (75 mM/L):** The sodium content was reduced from 90 mEq/L to 75 mEq/L. This lower concentration is safer for children, as it prevents the osmotic pull of water into the gut lumen, thereby reducing stool volume. 2. **Glucose Concentration (75 mM/L):** Glucose is essential for the co-transport of sodium across the intestinal epithelium via the SGLT-1 transporter. A 1:1 molar ratio of sodium to glucose is maintained for optimal absorption. 3. **Total Osmolarity (245 mOsm/L):** The total osmolarity was reduced from 311 mOsm/L to 245 mOsm/L. This "hypotonic" solution ensures faster water absorption and prevents osmotic diarrhea. ### **Composition of New WHO ORS (High-Yield Table)** | Component | Concentration (mmol/L) | | :--- | :--- | | **Sodium** | 75 | | **Chloride** | 65 | | **Glucose (Anhydrous)** | 75 | | **Potassium** | 20 | | **Citrate** | 10 | | **Total Osmolarity** | **245 mOsm/L** | ### **Clinical Pearls for NEET-PG** * **Trisodium Citrate** is used instead of Bicarbonate because it increases the shelf life of the ORS packet. * **Zinc Supplementation:** Should be given alongside ORS (20 mg/day for 10–14 days; 10 mg/day for infants <6 months) to reduce the duration and severity of diarrhea. * **ReSoMal:** A special ORS used for children with **Severe Acute Malnutrition (SAM)**; it has lower sodium (45 mmol/L) and higher potassium (40 mmol/L).

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

Increased thirst. 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."

Q: Which condition is characterized by an absent bile duct?

Alagille syndrome. **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 1

Parents bring their infant to the clinic, seeking treatment for vomiting and diarrhoea that has lasted for 2 days. On assessment, the nurse in charge detects dry mucous membranes and lethargy. What other findings suggest a fluid volume deficit?

Accepted Answer

A sunken fontanel

Answer

Decreased pulse rate

Answer

Increased blood pressure

Answer

Low urine specific gravity

Question 2

What is the duration considered for persistent diarrhea in infants?

Accepted Answer

14 days

Answer

7 days

Answer

21 days

Answer

1 month

Question 3

What is the commonest cause of vomiting in a one-month-old infant?

Accepted Answer

Aerophagy

Answer

Pyloric stenosis

Answer

Cardiac chalasia

Answer

Gastro–esophageal reflux

Question 4

True about the concentration of Oral Rehydration Solution is:

Accepted Answer

Potassium 20 mEq/lit

Answer

Sodium 70 mEq/lit

Answer

Bicarbonate 80 mEq/lit

Answer

Chloride 30 mEq/lit

Question 5

Which of the following is not a reliable indicator of dehydration?

Accepted Answer

Skin turgor

Answer

Dry buccal mucosa

Answer

Oliguria

Answer

Thirst

Question 6

A 6-year-old boy presents with a palpable abdominal mass in the epigastrium. There is no bile in the vomitus. What is the clinical diagnosis?

Accepted Answer

Pyloric stenosis

Answer

Duodenal Atresia

Answer

Choledochal cyst

Answer

Esophageal Atresia

Question 7

Which of the following statements is true about the new WHO oral rehydration solution (ORS) formula?

Accepted Answer

All of the above.

Answer

It has a sodium ion concentration of 75 mM/L.

Answer

Its glucose concentration is 75 mM/L.

Answer

Its total osmolarity is 245 mOsm/L.

Question 8

Which of the following is not a sign of severe dehydration?

Accepted Answer

Increased thirst

Answer

Tachycardia

Answer

Anuria

Answer

Delayed capillary refill

Question 9

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

Accepted Answer

Biliary atresia

Answer

Neonatal hepatitis

Answer

Choledochal cyst

Answer

Sclerosing cholangitis

Question 10

Which condition is characterized by an absent bile duct?

Accepted Answer

Alagille syndrome

Answer

Crigler Najjar Syndrome

Answer

Gilbert's Syndrome

Answer

Primary Sclerosing Cholangitis

Gastroenterology — MCQs

Gastroenterology — MCQs

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