Gastroenterology Practice Questions

Q: What is the major risk factor, along with alcohol intake, for the development of alcoholic liver disease?

Chronic HCV infection. The development and progression of alcoholic liver disease (ALD) are influenced by several cofactors, with **Chronic Hepatitis C Virus (HCV) infection** being the most significant. **1. Why Chronic HCV is the correct answer:** There is a synergistic relationship between alcohol consumption and HCV [1]. Alcohol enhances HCV replication and increases oxidative stress within hepatocytes [1]. Clinical studies consistently show that patients with both chronic HCV and heavy alcohol intake develop cirrhosis at a younger age, have a higher frequency of decompensation, and face a significantly increased risk of developing **Hepatocellular Carcinoma (HCC)** compared to those with either risk factor alone. **2. Why other options are incorrect:** * **Chronic HBV infection:** While HBV is a major cause of cirrhosis and HCC, its synergistic link with alcohol is less pronounced and less frequently documented in epidemiological studies compared to the alcohol-HCV interaction. * **Non-hepatotropic virus infection:** Viruses like CMV or EBV may cause transient hepatitis but do not lead to chronic liver disease or synergize with alcohol to promote cirrhosis. * **Abdominal tuberculosis:** This is an infectious granulomatous disease primarily affecting the peritoneum and bowel [2]. It does not directly accelerate the pathophysiological mechanisms of alcoholic steatohepatitis or fibrosis. **High-Yield Clinical Pearls for NEET-PG:** * **Gender:** Women are more susceptible to ALD than men at lower levels of alcohol intake due to lower levels of gastric alcohol dehydrogenase [1]. * **Obesity:** Non-alcoholic fatty liver disease (NAFLD) and alcohol have a "double hit" effect on liver fibrosis. * **Genetic Factor:** Polymorphisms in the **PNPLA3 gene** are strongly associated with an increased risk of alcoholic cirrhosis. * **Threshold:** The risk of cirrhosis increases significantly with the consumption of >30g of ethanol per day [1].

Q: Which of the following is NOT a complication of ulcerative colitis?

Peptic ulceration. **Explanation:** Ulcerative Colitis (UC) is a chronic inflammatory bowel disease characterized by mucosal inflammation limited to the colon and rectum [2]. Complications are categorized into intestinal (local) and extra-intestinal (systemic) manifestations [3]. **Why Peptic Ulceration is the correct answer:** Peptic ulceration is a disease of the upper gastrointestinal tract (stomach and duodenum) primarily caused by *H. pylori* infection or NSAID use [1]. It is **not** pathophysiologically linked to ulcerative colitis. While Crohn’s disease can involve any part of the GIT from mouth to anus (including the stomach), UC strictly involves the large intestine [2]. **Analysis of incorrect options:** * **Arthritis:** This is the **most common** extra-intestinal manifestation of UC. It typically presents as peripheral arthritis (often mirroring bowel activity) or axial involvement like Ankylosing Spondylitis (independent of bowel activity) [3]. * **Sclerosing Cholangitis (PSC):** Primary Sclerosing Cholangitis is a classic hepatobiliary complication [3]. Approximately 70-80% of patients with PSC have underlying UC. It increases the risk of cholangiocarcinoma. * **Toxic Megacolon:** A life-threatening intestinal complication where the colon dilates (>6 cm) due to transmural inflammation, leading to a risk of perforation and sepsis. **NEET-PG High-Yield Pearls:** * **Most common extra-intestinal manifestation:** Peripheral Arthritis [3]. * **Most specific skin manifestation:** Pyoderma Gangrenosum (more common in UC than Crohn's). * **Malignancy risk:** UC significantly increases the risk of Colorectal Carcinoma; screening colonoscopy is recommended 8–10 years after diagnosis. * **Serology:** p-ANCA is positive in 60-70% of UC patients.

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: All of the following are seen in Crohn's disease EXCEPT?

Rectum is commonly involved. **Explanation:** The correct answer is **D (Rectum is commonly involved)** because rectal involvement is a hallmark of **Ulcerative Colitis (UC)** [2], not Crohn’s Disease (CD). In Crohn’s, the rectum is typically **spared**, and the disease is characterized by "skip lesions" (discontinuous involvement) anywhere from the mouth to the anus [1]. **Analysis of Options:** * **A. Poor perianal hygiene:** This is a clinical manifestation of Crohn’s disease due to the frequent occurrence of **perianal complications** such as fistulae, fissures, and skin tags [1]. These make local hygiene difficult and painful. * **B. Stricture formation:** Crohn’s is a **transmural** inflammatory process. Chronic inflammation leads to fibrosis and narrowing of the bowel lumen, commonly resulting in strictures and intestinal obstruction (the "string sign of Kantor" on imaging) [3]. * **C. Crypt abscess:** While more characteristic and numerous in Ulcerative Colitis, crypt abscesses (neutrophils in the crypt lumen) can still be seen in Crohn's disease during the active phase [2]. **NEET-PG High-Yield Pearls:** * **Most common site:** Terminal ileum (Ileocolic region). * **Pathology:** Non-caseating granulomas (pathognomonic), transmural inflammation, and "cobblestone" appearance. * **Serology:** ASCA (Anti-Saccharomyces cerevisiae antibodies) is positive in CD; p-ANCA is positive in UC. * **Smoking:** Increases the risk and severity of Crohn’s disease (conversely, it is protective in Ulcerative Colitis). * **Creeping Fat:** Mesenteric fat wraps around the bowel surface, a classic surgical finding in CD.

Q: Spontaneous Bacterial Peritonitis is indicated by the presence of which of the following in ascitic fluid?

Absolute PMN count > 250 cells/mm³. **Explanation:** **Spontaneous Bacterial Peritonitis (SBP)** is an acute bacterial infection of ascitic fluid, typically occurring in patients with advanced cirrhosis. The diagnosis is primarily established through a diagnostic paracentesis. **Why Option D is correct:** The gold standard for diagnosing SBP is an **absolute polymorphonuclear leukocyte (PMN) count ≥ 250 cells/mm³** in the ascitic fluid. PMNs (neutrophils) are the primary responders to bacterial seeding of the peritoneum. This threshold has the highest sensitivity for identifying infection, even if the culture results are negative (referred to as Culture-Negative Neutrocytic Ascites). **Why other options are incorrect:** * **Options A & C:** Lymphocytes are the predominant cell type in conditions like **Tuberculous peritonitis** or peritoneal carcinomatosis [1]. In SBP, the inflammatory response is specifically neutrophilic, not lymphocytic. * **Option B:** While a PMN count > 500 cells/mm³ is certainly diagnostic of SBP, it is not the minimum diagnostic threshold. Using 500 as the cutoff would miss many early or less severe cases of SBP, leading to increased mortality. **High-Yield Clinical Pearls for NEET-PG:** * **Most common organism:** *Escherichia coli* (followed by *Klebsiella pneumoniae*). * **Treatment of choice:** Third-generation cephalosporins (e.g., **Cefotaxime**). * **Albumin Therapy:** Administering IV albumin (1.5g/kg on day 1 and 1g/kg on day 3) reduces the risk of Hepatorenal Syndrome and mortality. * **Secondary Peritonitis vs. SBP:** Suspect secondary peritonitis (due to gut perforation) if the ascitic fluid shows multiple organisms on Gram stain, glucose upper limit of normal for serum.

Question 1

What is the major risk factor, along with alcohol intake, for the development of alcoholic liver disease?

Accepted Answer

Chronic HCV infection

Answer

Chronic HBV infection

Answer

Non hepatotropic virus infection

Answer

Abdominal tuberculosis

Question 2

Which of the following is NOT a complication of ulcerative colitis?

Accepted Answer

Peptic ulceration

Answer

Arthritis

Answer

Sclerosing cholangitis

Answer

Toxic megacolon

Question 3

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 4

Celiac sprue is associated with which HLA type?

Accepted Answer

HLA DQ2

Answer

HLA DQ 1

Answer

HLA DQ3

Answer

HLA DQ4

Question 5

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 6

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 7

All of the following are seen in Crohn's disease EXCEPT?

Accepted Answer

Rectum is commonly involved

Answer

Poor perianal hygiene

Answer

Stricture formation

Answer

Crypt abscess

Question 8

Spontaneous Bacterial Peritonitis is indicated by the presence of which of the following in ascitic fluid?

Accepted Answer

Absolute PMN count > 250 cells/mm³

Answer

Absolute lymphocyte count > 500 cells/mm³

Answer

Absolute PMN count > 500 cells/mm³

Answer

Absolute lymphocyte count > 250 cells/mm³

Question 9

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 10

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

Gastroenterology — MCQs

Gastroenterology — MCQs

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