Gastroenterology Practice Questions

Q: Aganglionic segment is encountered in which part of the colon in case of Hirschsprung's disease?

Distal to dilated segment. ***Distal to dilated segment*** - In **Hirschsprung's disease**, the aganglionic (lacking nerve ganglia) segment is always located **distal to the dilated segment**. - The dilated segment occurs because stool accumulates *proximal* to the constricted aganglionic portion, which cannot relax to allow passage. - The aganglionic segment is typically in the **rectosigmoid region** (80% of cases), though it can extend more proximally. *In whole colon* - Total colonic aganglionosis is a very rare form of Hirschsprung's disease (~5% of cases), but it's not the typical presentation where a specific segment is affected. - The classic presentation involves a shorter segment of aganglionosis, usually in the rectosigmoid. *Proximal to dilated segment* - The segment *proximal* to the aganglionic zone is typically the normal, ganglionated segment that becomes enlarged due to fecal backup. - The pathology in Hirschsprung's disease is the *absence* of ganglia in the distal segment, not proximal to the obstruction. *In dilated segment* - The dilated segment is **not aganglionic**; it is the normal, ganglionated colon that has hypertrophied and distended due to the obstruction from the distal aganglionic segment. - The problem is *distal* to this dilated, functional (but obstructed) colon.

Q: Ramu, an 8-year-old boy, presents with upper gastrointestinal bleeding. On examination, he is found to have splenomegaly, with no signs of ascites or hepatomegaly, and esophageal varices are detected on upper gastrointestinal endoscopy. What is the most likely diagnosis?

Non cirrhotic portal hypertension. ***Non cirrhotic portal hypertension*** - The presence of **splenomegaly** and **esophageal varices** with **no signs of ascites or hepatomegaly** strongly suggests **portal hypertension** that is not due to cirrhosis. [1] - This condition involves increased portal venous pressure due to obstructions *before* (pre-hepatic) or *within* (intra-hepatic, non-cirrhotic) the liver, or *after* (post-hepatic) the liver, leading to splenomegaly and collateral circulation. [2] *Budd chiari syndrome* - Characterized by **hepatic vein outflow obstruction**, manifesting with **hepatomegaly**, ascites, and abdominal pain, which are not described in the patient. - While it can cause portal hypertension and esophageal varices, the lack of hepatomegaly and ascites makes it less likely in this case. *Cirrhosis* - Marked by diffuse **hepatic fibrosis** and **nodule formation**, leading to impaired liver function, **hepatomegaly** (initially), and often **ascites**, which are absent. [3] - While it causes portal hypertension and varices, the absence of liver dysfunction symptoms or signs of chronic liver disease makes this less probable. *Veno-occlusive disease* - This condition primarily affects the **small intrahepatic venules**, leading to **hepatomegaly**, ascites, and jaundice, especially after hematopoietic stem cell transplantation. - The patient's presentation lacks the typical features of acute liver damage and hepatomegaly associated with veno-occlusive disease.

Q: A newborn child who has not passed meconium for 48 hours. What is the diagnostic procedure of choice?

Contrast enema. **Contrast enema** - A **contrast enema** is the diagnostic procedure of choice to visualize the colon and rectum, evaluate for a **transition zone**, and identify potential causes of **meconium retention**, such as **Hirschsprung disease** or **meconium plug syndrome**. - It can differentiate between various causes of neonatal intestinal obstruction by showing the caliber of the bowel lumen and the presence of any filling defects. *USG* - **Ultrasound** (USG) is generally not the primary diagnostic tool for evaluating delayed meconium passage as it provides limited information about the detailed anatomy and function of the intestinal lumen necessary for diagnosing conditions like **Hirschsprung disease**. - While it can detect some abdominal abnormalities, it is less effective for defining the specific causes of distal intestinal obstruction in this context. *CT* - **Computed Tomography (CT)** scans expose the neonate to significant **ionizing radiation**, and its use is typically reserved for more complex cases or when other less invasive methods have been inconclusive. - While CT can provide detailed anatomical images, it is not the initial or preferred diagnostic procedure for evaluating delayed meconium passage due to the radiation risk and the effectiveness of **contrast enema**. *MRI* - **Magnetic Resonance Imaging** (MRI) also involves prolonged imaging times and may require sedation in neonates, making it less practical as a first-line diagnostic modality for delayed meconium passage. - Although it provides excellent soft tissue contrast, its role in diagnosing intestinal obstructions in newborns is limited, especially given the rapid and effective diagnostic capabilities of a **contrast enema**.

Q: What is the standard citrate content in Oral Rehydration Solution (ORS) in millimoles per liter?

10. ***10*** - The **standard citrate content** in Oral Rehydration Solution (ORS), as per WHO guidelines, is **10 mmol/L**. - WHO ORS (2006 formulation) contains trisodium citrate dihydrate at 2.9 g/L, providing 10 mmol/L of citrate. - Citrate serves as a **bicarbonate precursor**, helping to correct metabolic acidosis often associated with dehydration. *20* - This value is **higher than the recommended** citrate concentration for standard ORS formulations. - Excessive citrate could potentially lead to **unwanted side effects** or alter the solution's osmolarity. *30* - This concentration is **significantly above** the standard citrate content in ORS when expressed in mmol/L. - Note: 10 mmol/L of trivalent citrate equals 30 mEq/L, but WHO guidelines express citrate in mmol/L, not mEq/L. *40* - This represents an **extremely high** citrate concentration for ORS. - Such a high level would be **detrimental** and is not used in standard oral rehydration therapy.

Q: Which of the following statements is true regarding Hirschsprung's disease?

The rectum is the most common site affected.. ***The rectum is the most common site affected.*** - Hirschsprung's disease is a **congenital aganglionic megacolon**, where a segment of the colon lacks parasympathetic ganglia. - The **rectum** is almost always involved (nearly 100% of cases), with involvement extending proximally to varying degrees. - Most commonly affects the **rectosigmoid region** (75-80% of cases). *The aganglionic segment is dilated, not contracted.* - The aganglionic segment is typically **constricted** and **non-peristaltic**, leading to functional obstruction. - The bowel proximal to the aganglionic segment becomes **dilated** due to stool accumulation. - This creates the characteristic **transition zone** seen on imaging. *Barium enema is the gold standard for definitive diagnosis.* - While **barium enema** can show a transition zone and dilated proximal bowel, it is NOT the gold standard. - The **gold standard** for definitive diagnosis is **rectal biopsy** demonstrating absence of ganglion cells and presence of hypertrophied nerve trunks. - Barium enema is a useful diagnostic tool but not definitive on its own. *Calcification is a typical feature of this disorder.* - **Calcification** is not a feature of Hirschsprung's disease. - The pathology involves the **absence of ganglion cells** in the myenteric (Auerbach's) and submucosal (Meissner's) plexuses, not calcific deposits.

Q: Which of the following conditions is most commonly associated with childhood cholelithiasis?

Hereditary spherocytosis. ***Hereditary spherocytosis*** - This condition leads to chronic **hemolysis** due to defective red blood cell membranes, causing premature destruction of red blood cells. - The increased breakdown of red blood cells results in elevated levels of **unconjugated bilirubin**, which is then excreted into bile, increasing the risk of **pigment gallstones** and cholelithiasis. *Sickle cell disease* - While sickle cell disease is a hemolytic condition that can cause **cholelithiasis** due to chronic hemolysis, it is generally less common in childhood compared to hereditary spherocytosis. - Sickle cell disease more frequently presents with **vaso-occlusive crises** and other complications like acute chest syndrome or dactylitis. *Total parenteral nutrition (TPN)* - TPN can lead to cholelithiasis, but this is due to **biliary stasis** and sludge formation from prolonged lack of oral intake, rather than hemolysis. - It's a risk factor for gallstones, but it is not a hemolytic condition itself. *Cystic fibrosis* - Patients with cystic fibrosis are at an increased risk of gallstones, primarily due to **abnormal bile composition** and mucin hypersecretion, which can lead to biliary sludge and stone formation. - Cholelithiasis in cystic fibrosis is not typically linked to a **hemolytic process**.

Q: Which of the following statements is not true regarding hypertrophic pyloric stenosis?

Dilated stomach with significant gas. ***Dilated stomach with significant gas*** - This statement is **not true** as described because while the stomach may be dilated in **hypertrophic pyloric stenosis**, the key radiographic finding is a **gas-filled stomach with absent or minimal gas distally** in the bowel. - The phrase "significant gas" is misleading because the characteristic finding is actually **gastric distention with gas** but **lack of gas beyond the pyloric obstruction**. - On imaging, you see a **dilated, fluid-filled stomach** (often described as the "caterpillar sign" on ultrasound) with minimal air in the duodenum and distal bowel, not "significant gas" throughout. *Ultrasound is the investigation of choice for diagnosis* - **Ultrasound** is indeed the gold standard for diagnosing hypertrophic pyloric stenosis, offering a non-invasive and accurate way to measure **pyloric muscle thickness** and length. - Typical ultrasound findings include a **pyloric muscle thickness** greater than 3 mm and a pyloric channel length greater than 14-16 mm. - The "target sign" or "doughnut sign" on transverse view is pathognomonic. *Usually presents between 2 - 8 weeks* - Hypertrophic pyloric stenosis commonly manifests between **2 and 8 weeks** of life, with peak incidence around 3-5 weeks. - This presentation typically follows a period of normal feeding before the characteristic **projectile, non-bilious vomiting** begins. - It can occur as early as 1 week or as late as 5 months, though this is less common. *Common in males* - The condition has a clear **male predominance**, with a male-to-female ratio of approximately **4:1**. - It is also more common in **first-born males** and has a genetic predisposition, with higher incidence in families where a parent or sibling was affected.

Q: In which condition does maximum sodium loss occur in a child?

Cholera. ***Cholera*** - **Cholera** causes **massive losses of isotonic fluid** with stool volumes reaching up to **1 liter per hour** in severe cases - The **cholera toxin** activates intestinal epithelial cell secretion, producing characteristic "rice-water stool" with sodium concentration of **90-140 mEq/L** (nearly isotonic to plasma) - Results in severe losses of **sodium, chloride, bicarbonate, and potassium**, leading to profound dehydration and electrolyte imbalances - Represents the **maximum acute sodium loss** among all pediatric gastrointestinal conditions *Gastric juice* - Loss of gastric juice (e.g., from severe vomiting or pyloric stenosis) primarily depletes **hydrogen ions and chloride**, causing **metabolic alkalosis** - Gastric fluid has **relatively low sodium concentration** (~60 mEq/L), much less than cholera stool - While clinically significant, sodium loss is not the predominant electrolyte disturbance *Ileal fluid* - Ileal fluid has moderate sodium concentration (100-140 mEq/L), similar to cholera - However, **volume of loss is typically much less** than in acute cholera - Seen in conditions like high-output ileostomy or short bowel syndrome - Losses occur more **gradually** rather than the acute, massive depletion in cholera *Non cholera Diarrhoea* - Most non-cholera diarrheal illnesses (viral, bacterial) cause **less severe fluid losses** - The fluid is often more **hypotonic** (lower sodium concentration per unit volume) - Total sodium depletion is typically **less profound** than cholera, though still clinically significant

Question 1

The commonest cause of intestinal obstruction and abdominal pain in children between 3 months and 6 years of age is:

Accepted Answer

Intussusception

Answer

Meckel's diverticulum

Answer

Intestinal polyp

Answer

Nonspecific cause

Question 2

Aganglionic segment is encountered in which part of the colon in case of Hirschsprung's disease?

Accepted Answer

Distal to dilated segment

Answer

In whole colon

Answer

Proximal to dilated segment

Answer

In dilated segment

Question 3

Ramu, an 8-year-old boy, presents with upper gastrointestinal bleeding. On examination, he is found to have splenomegaly, with no signs of ascites or hepatomegaly, and esophageal varices are detected on upper gastrointestinal endoscopy. What is the most likely diagnosis?

Accepted Answer

Non cirrhotic portal hypertension

Answer

Budd chiari syndrome

Answer

Cirrhosis

Answer

Veno-occlusive disease

Question 4

What is the calculated fluid requirement for treating dehydration and maintenance over a 4-hour period in a 14 kg, 14-month-old child with a 4-day history of loose stools, decreased urine output, delayed skin pinch, sunken eyes, and dry mucosa?

Accepted Answer

1050 ml

Answer

700 ml

Answer

1200 ml

Answer

2000 ml

Question 5

A newborn child who has not passed meconium for 48 hours. What is the diagnostic procedure of choice?

Accepted Answer

Contrast enema

Answer

USG

Answer

CT

Answer

MRI

Question 6

What is the standard citrate content in Oral Rehydration Solution (ORS) in millimoles per liter?

Accepted Answer

10

Answer

30

Answer

20

Answer

40

Question 7

Which of the following statements is true regarding Hirschsprung's disease?

Accepted Answer

The rectum is the most common site affected.

Answer

The aganglionic segment is dilated, not contracted.

Answer

Barium enema is the gold standard for definitive diagnosis.

Answer

Calcification is a typical feature of this disorder.

Question 8

Which of the following conditions is most commonly associated with childhood cholelithiasis?

Accepted Answer

Hereditary spherocytosis

Answer

Total parenteral nutrition (TPN)

Answer

Sickle cell disease

Answer

Cystic fibrosis

Question 9

Which of the following statements is not true regarding hypertrophic pyloric stenosis?

Accepted Answer

Dilated stomach with significant gas

Answer

Usually presents between 2 - 8 weeks

Answer

Common in males

Answer

Ultrasound is the investigation of choice for diagnosis.

Question 10

In which condition does maximum sodium loss occur in a child?

Accepted Answer

Cholera

Answer

Gastric juice

Answer

Non cholera Diarrhoea

Answer

Ileal fluid

Gastroenterology — MCQs

Gastroenterology — MCQs

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