Gastroenterology Practice Questions

Q: In Wilson disease patients with hepatic decompensation, which index is used to assess disease severity?

Nazer prognostic index. **Explanation:** The **Nazer Prognostic Index** is the specific scoring system used to assess the severity and predict mortality in patients with Wilson disease presenting with hepatic decompensation. It utilizes three parameters: **Serum Bilirubin, Serum AST (SGOT), and Prothrombin Time (INR)**. A score of 7 or more indicates a high risk of mortality and serves as a critical indicator for urgent liver transplantation. **Analysis of Options:** * **A. Nazer Prognostic Index (Correct):** Specifically designed for Wilson disease. It helps clinicians decide between medical management (chelators) and liver transplantation. * **B. Ishak Scoring System:** This is a histological scoring system used to grade activity (necroinflammation) and stage fibrosis in chronic hepatitis (e.g., Hepatitis B or C) based on liver biopsy findings. * **C. Lille Score:** Used specifically in **Alcoholic Hepatitis** to predict 6-month survival and assess the response to corticosteroid therapy after 7 days of treatment. * **D. Rockall Score:** Used to assess the risk of re-bleeding and mortality in patients with **Acute Upper Gastrointestinal Bleeding**. **High-Yield Clinical Pearls for NEET-PG:** * **Wilson Disease Triad:** Liver disease, neuropsychiatric symptoms (basal ganglia involvement), and Kayser-Fleischer (KF) rings [1]. * **Diagnosis:** Low serum ceruloplasmin (<20 mg/dL), increased 24-hour urinary copper excretion, and the "Giant Panda" sign on MRI brain. * **Coombs-Negative Hemolytic Anemia:** A classic presentation of Wilsonian fulminant hepatic failure due to the sudden release of copper into the bloodstream [1]. * **Treatment:** Penicillamine (drug of choice), Trientine, or Zinc (for maintenance/asymptomatic cases).

Q: Celiac sprue is associated with which HLA type?

HLA DQ2. **Explanation:** Celiac disease (Gluten-sensitive enteropathy) is a T-cell mediated autoimmune disorder triggered by the ingestion of gluten in genetically predisposed individuals. The genetic susceptibility is strongly linked to specific Class II Human Leukocyte Antigens (HLA) [1]. **Why HLA-DQ2 is correct:** Approximately **95% of patients** with Celiac disease carry the **HLA-DQ2** allele. The remaining 5% usually carry **HLA-DQ8**. These specific HLA molecules have a high affinity for binding deamidated gliadin peptides (derived from gluten). Once bound, these peptides are presented to CD4+ T-cells, triggering an inflammatory cascade that leads to villous atrophy and malabsorption [1]. **Analysis of Incorrect Options:** * **HLA-DQ1:** Not associated with Celiac disease; it is more commonly linked to certain types of narcolepsy or peripheral neuropathies in specific research contexts. * **HLA-DQ3:** This is a broad serotype that includes DQ7, DQ8, and DQ9. While DQ8 is associated with Celiac, the general category DQ3 is not the primary diagnostic marker. * **HLA-DQ4:** No established clinical association with Celiac disease or major autoimmune enteropathies. **NEET-PG High-Yield Pearls:** * **Negative Predictive Value:** The absence of HLA-DQ2/DQ8 has a nearly **100% negative predictive value**, meaning if a patient lacks both, Celiac disease can be effectively ruled out. * **Associated Conditions:** Celiac disease is frequently associated with **Dermatitis Herpetiformis** (intensely pruritic vesicles on extensors) and **Selective IgA Deficiency**. * **Gold Standard Diagnosis:** Intestinal biopsy showing **Villous Atrophy**, Crypt Hyperplasia, and increased Intraepithelial Lymphocytes (Marsh Classification) [1]. * **Serology:** Anti-tissue Transglutaminase (anti-tTG) IgA is the screening test of choice.

Q: In a patient with jaundice, what does the absence of urobilinogen in the urine indicate?

Obstructive jaundice. ### Explanation **1. Why Obstructive Jaundice is Correct:** The presence of urobilinogen in urine depends on the **enterohepatic circulation** of bilirubin. In a healthy state, conjugated bilirubin is excreted into the intestine via the bile duct, where gut bacteria convert it into urobilinogen [1]. Most of this is excreted in feces (as stercobilin), but a small portion is reabsorbed into the portal blood and excreted by the kidneys. In **Obstructive Jaundice** (Post-hepatic), there is a complete blockage of bile flow into the intestine. Since no bilirubin reaches the gut, no urobilinogen is formed [1]. Consequently, there is nothing to be reabsorbed into the blood or excreted in the urine, leading to **absent urinary urobilinogen** [1]. **2. Why the Other Options are Incorrect:** * **Hemolysis (Pre-hepatic):** Increased breakdown of RBCs leads to high levels of unconjugated bilirubin, which results in increased production and excretion of urobilinogen. Urine urobilinogen is **elevated** here [1]. * **Hepatitis & Liver Failure (Hepatic):** In these conditions, the liver cannot efficiently re-excrete reabsorbed urobilinogen back into the bile. This causes more urobilinogen to be diverted to the kidneys, typically resulting in **normal or increased** urinary urobilinogen (unless there is significant intrahepatic cholestasis) [1]. **3. NEET-PG High-Yield Pearls:** * **"Clay-colored stools"** occur in obstructive jaundice because stercobilin (the derivative of urobilinogen) is absent in the feces [1]. * **Bilirubinuria vs. Urobilinogen:** In obstructive jaundice, urine contains **conjugated bilirubin** (making it dark/tea-colored) but **no urobilinogen** [1]. * **Van den Bergh Reaction:** Obstructive jaundice gives a **Direct Positive** reaction, while Hemolysis gives an **Indirect Positive** reaction [1].

Q: Which of the following statements about acute pancreatitis is true?

It is common in alcoholics.. ### Explanation **Correct Option: C. It is common in alcoholics.** Alcohol consumption is the second most common cause of acute pancreatitis worldwide (after gallstones). Alcohol induces the synthesis of digestive and lysosomal enzymes by pancreatic acinar cells and increases the permeability of ductules, leading to premature enzyme activation and autodigestion of the gland. **Analysis of Incorrect Options:** * **A. Pain lasts for several hours:** This is misleading. In acute pancreatitis, the pain is typically constant, severe, and lasts for **several days**, not just hours. It characteristically radiates to the back and is partially relieved by leaning forward (knee-chest position). * **B. Serum amylase levels correlate with severity:** This is a classic "trap" fact. While amylase is used for diagnosis (rising within 2–12 hours), the **magnitude of the elevation does not correlate** with the clinical severity or prognosis. A patient with mild disease may have very high levels, while a patient with severe necrotizing pancreatitis may have near-normal levels due to parenchymal destruction. * **D. Low serum calcium levels indicate a good prognosis:** On the contrary, hypocalcemia (Serum Calcium <8 mg/dL) is a sign of **poor prognosis**. It occurs due to "saponification," where calcium soaps form in areas of fat necrosis. It is a key component of the **Ranson Criteria** and **Modified Glasgow Score** for predicting severity. **High-Yield NEET-PG Pearls:** * **Most common cause:** Gallstones (Overall); Alcohol (in men). * **Most specific enzyme:** Serum Lipase (remains elevated longer than amylase). * **Gold standard imaging:** Contrast-Enhanced CT (CECT) scan (best done after 72 hours to assess necrosis). * **Cullen’s sign:** Periumbilical ecchymosis (indicates hemoperitoneum/severe pancreatitis). * **Grey Turner’s sign:** Flank ecchymosis.

Q: Which of the following is a specific marker for intestinal inflammation?

Fecal lactoferrin. The correct answer is **Fecal lactoferrin**. **Why Fecal Lactoferrin is the Correct Answer:** Lactoferrin is an iron-binding glycoprotein found primarily in the secondary granules of neutrophils. When inflammation occurs in the intestinal mucosa, neutrophils migrate to the site and degranulate, releasing lactoferrin into the feces. Because it is specifically released by leukocytes in the gut lumen, it serves as a highly sensitive and specific marker for **intestinal inflammation**. It is particularly useful in clinical practice to differentiate **Inflammatory Bowel Disease (IBD)** from non-inflammatory conditions like Irritable Bowel Syndrome (IBS). **Analysis of Incorrect Options:** * **A. C-reactive protein (CRP):** While CRP is an acute-phase reactant that rises during inflammation, it is a **systemic marker**. It can be elevated due to infections, trauma, or inflammation anywhere in the body (e.g., pneumonia, UTI), making it non-specific to the intestine. * **C. Erythrocyte sedimentation rate (ESR):** Similar to CRP, ESR is a non-specific indicator of systemic inflammation and is influenced by age, sex, and red blood cell morphology. * **D. Leukocytosis:** An elevated white blood cell count indicates an immune response but does not localize the site of pathology [1]. It can occur in any systemic infection or inflammatory state. **NEET-PG High-Yield Pearls:** * **Fecal Calprotectin:** Another highly specific marker for intestinal inflammation (often tested alongside lactoferrin). It is a calcium-binding protein derived from neutrophils. * **Clinical Utility:** These markers are used to monitor IBD activity and predict relapses [2]. * **Rule of Thumb:** If a patient has chronic diarrhea but **normal** fecal calprotectin/lactoferrin, the diagnosis is likely **IBS** rather than IBD.

Question 1

In Wilson disease patients with hepatic decompensation, which index is used to assess disease severity?

Accepted Answer

Nazer prognostic index

Answer

Ishak scoring system

Answer

Lille score

Answer

Rockall score

Question 2

Celiac sprue is associated with which HLA type?

Accepted Answer

HLA DQ2

Answer

HLA DQ 1

Answer

HLA DQ3

Answer

HLA DQ4

Question 3

In a patient with jaundice, what does the absence of urobilinogen in the urine indicate?

Accepted Answer

Obstructive jaundice

Answer

Hemolysis

Answer

Liver failure

Answer

Hepatitis

Question 4

A 40-year-old chronic alcoholic presents with a distended abdomen, hematemesis, and fresh blood in the stool. On examination, huge ascites and distended veins over the abdominal wall are noted. What is the most likely cause of the hematemesis?

Accepted Answer

Esophageal varices

Answer

Esophagitis

Answer

Esophageal cancer

Answer

Erosion of the gastroduodenal artery

Question 5

A 65-year-old man presented with an episode of syncope. He reported feeling dizzy during defecation and noted gross bleeding in the toilet pan. A fecal occult blood test done 3 months prior as part of routine screening for colon cancer was negative. There is no history of recent weight loss. What is the likely colonoscopic finding?

Accepted Answer

Dilated mucosal and submucosal veins in the colon

Answer

Early stage carcinoma of the colon

Answer

Sigmoid diverticulitis

Answer

Microscopic colitis

Question 6

A young patient presents with jaundice. Total bilirubin is 21 mg/dL, direct bilirubin is 9.6 mg/dL, and alkaline phosphatase is 84 KA units. What is the most likely diagnosis?

Accepted Answer

Obstructive jaundice

Answer

Hemolytic jaundice

Answer

Viral hepatitis

Answer

Chronic active hepatitis

Question 7

Which of the following statements about acute pancreatitis is true?

Accepted Answer

It is common in alcoholics.

Answer

Pain lasts for several hours.

Answer

Serum amylase levels correlate with the severity of the attack.

Answer

Low serum calcium levels indicate a good prognosis.

Question 8

Which of the following is a specific marker for intestinal inflammation?

Accepted Answer

Fecal lactoferrin

Answer

C-reactive protein

Answer

Erythrocyte sedimentation rate

Answer

Leukocytosis

Question 9

Which of the following treatment modalities is NOT used for the management of acute blood loss due to ruptured esophageal varices?

Accepted Answer

Propranolol

Answer

Endoscopic sclerotherapy

Answer

Endoscopic band ligation

Answer

Octreotide

Question 10

A patient with chronic diarrhea noticed improvement in symptoms after prolonged fasting. What is the most probable diagnosis?

Accepted Answer

Diarrhea secondary to lactose malabsorption

Answer

Inflammatory bowel disease

Answer

Irritable bowel syndrome

Answer

Enterotoxin-induced diarrhea

Gastroenterology — MCQs

Gastroenterology — MCQs

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