Gastroenterology Practice Questions

Q: Which is the earliest marker of hepatocellular failure?

Increased Prothrombin Time (PT). The liver is the primary site for the synthesis of most coagulation factors. **Prothrombin Time (PT)** is considered the earliest and most sensitive marker of acute hepatocellular failure [1] due to the **short half-life of Factor VII** (approximately 4–6 hours). Because Factor VII is the first to deplete when the liver's synthetic function is compromised, the PT/INR becomes prolonged rapidly, often within hours of significant hepatic insult [1]. **Analysis of Options:** * **A. Abnormal PTT:** While the Partial Thromboplastin Time (PTT) can be prolonged in liver disease, it reflects the intrinsic pathway. PT (extrinsic pathway) is more sensitive and changes much earlier. * **B. Decreased Albumin: Globulin ratio:** Albumin has a long half-life (approx. 20 days). Therefore, a decrease in albumin levels or a reversal of the A:G ratio is a marker of **chronic** liver disease (e.g., Cirrhosis) rather than acute failure. * **D. Increased Ammonia:** Hyperammonemia occurs due to the liver's inability to convert ammonia to urea. While it is a hallmark of hepatic encephalopathy, it is a metabolic consequence rather than a direct, early measure of synthetic failure. **NEET-PG High-Yield Pearls:** * **Best indicator of prognosis** in acute liver failure: Prothrombin Time (PT) [1]. * **Best indicator of synthetic function** in chronic liver disease: Serum Albumin. * **Factor VIII** is the only coagulation factor not synthesized exclusively by hepatocytes (it is produced by endothelial cells); thus, it remains normal or elevated in pure hepatocellular failure but is low in DIC. * **Vitamin K Trial:** If PT improves after Vitamin K administration, the cause is likely obstructive jaundice (malabsorption); if it does not improve, it indicates primary hepatocellular damage [1].

Q: Which of the following is NOT seen in Crohn's disease?

Endomyseal antibodies. **Explanation:** The correct answer is **C. Endomyseal antibodies**. Anti-endomyseal antibodies (EMA) are highly specific markers for **Celiac Disease**, not Crohn’s disease [1]. They are directed against tissue transglutaminase (tTG) and are used alongside anti-tTG IgA for the diagnosis of gluten-sensitive enteropathy [1]. **Analysis of Options:** * **A. ASCA+:** Anti-Saccharomyces cerevisiae antibodies (ASCA) are a classic serological marker for **Crohn’s disease** (found in 60-70% of cases). In contrast, p-ANCA is more commonly associated with Ulcerative Colitis. * **B. Skip Lesions:** This is a hallmark pathological feature of Crohn’s disease. Unlike Ulcerative Colitis, which involves continuous inflammation starting from the rectum [2], Crohn’s presents with **discontinuous** areas of inflammation separated by normal-appearing mucosa [2]. * **D. Cobblestone Appearance:** This occurs due to deep, longitudinal, and transverse aphthous ulcers intersecting with islands of edematous, normal mucosa [3]. It is a characteristic endoscopic finding in Crohn’s disease [3]. **NEET-PG High-Yield Pearls:** 1. **Transmural Inflammation:** Crohn’s involves all layers of the bowel wall, leading to complications like fistulae, strictures, and "creeping fat." 2. **Granulomas:** The presence of **non-caseating granulomas** is pathognomonic for Crohn’s (though seen in only ~50% of biopsies). 3. **Site:** The most common site is the **terminal ileum** (ileocolic region) [4]. 4. **String Sign of Kantor:** A classic radiological finding on barium swallow representing terminal ileal narrowing due to spasm or fibrosis [3].

Q: A patient with a known history of ulcerative colitis presents to the emergency department with abdominal distension and tenderness. An abdominal X-ray was performed. Which of the following is true regarding the patient's condition?

Toxic megacolon. ***Toxic megacolon*** - **Abdominal distension** and **tenderness** in a UC patient with **dilated transverse colon >6cm** and **loss of haustra** on X-ray are classic findings of **toxic megacolon**. - This is a **life-threatening complication** of ulcerative colitis requiring immediate medical intervention and possible surgical management. *Toxic megacolon is rarely seen in ulcerative colitis* - This statement is incorrect as **toxic megacolon** is a **well-recognized serious complication** of ulcerative colitis, occurring in 1-9% of patients. - It represents **acute colonic dilatation** with **systemic toxicity** and is considered a **medical emergency** in UC patients. *Sigmoid volvulus* - **Sigmoid volvulus** presents with a characteristic **coffee bean sign** on X-ray, showing twisted sigmoid colon with two air-fluid levels. - The clinical presentation typically involves **sudden onset crampy pain** and **obstipation**, different from the systemic toxicity seen in this UC patient. *Adhesions* - **Intestinal adhesions** cause **mechanical bowel obstruction** with **dilated small bowel loops** and **air-fluid levels** on X-ray. - The history lacks **previous abdominal surgery** or trauma, and adhesions don't typically cause **colonic dilatation** with **loss of haustra** as seen here.

Q: Yellowish exudates at multiple sites seen in colonoscopy indicates:

Crohn's disease. The presence of **yellowish exudates** at multiple sites during colonoscopy is a characteristic endoscopic finding of **Crohn’s Disease**. These exudates typically represent **aphthous ulcers** or fibrinopurulent material overlying deep, serpiginous ulcers. Crohn's disease is characterized by **transmural inflammation** and **"skip lesions"** [1] (discontinuous involvement), which explains why these exudative patches are seen at multiple, separated sites [1] rather than in a continuous fashion. **Analysis of Options:** * **Crohn’s Disease (Correct):** Beyond yellowish exudates, key endoscopic features include a **"cobblestone appearance"** (due to longitudinal ulcers and edematous mucosa), deep linear ulcers, and strictures. * **Hirschsprung Disease:** This is a functional obstruction caused by the absence of ganglion cells in the distal colon. Endoscopy typically shows a dilated proximal colon and a narrow distal segment, but not exudative ulcers. * **Tuberculosis (Intestinal):** While it can mimic Crohn’s, TB typically presents with **transverse ulcers**, a pulled-up cecum, and an incompetent ileocecal valve. Yellowish exudates are not the defining feature. * **Lymphoma:** Primary intestinal lymphoma usually presents as a bulky mass, a large infiltrating ulcer, or diffuse thickening of the bowel wall, rather than multiple small yellowish exudative spots. **High-Yield Clinical Pearls for NEET-PG:** * **Microscopic Hallmark:** Non-caseating granulomas (seen in ~40-60% of Crohn's cases). * **String Sign of Kantor:** A classic radiological finding in the terminal ileum due to spasm or stricture [1]. * **Creeping Fat:** Mesenteric fat wrapping around the bowel wall is pathognomonic for Crohn’s. * **ASCA vs. p-ANCA:** Crohn’s is associated with **ASCA** (Anti-Saccharomyces cerevisiae antibodies), whereas Ulcerative Colitis is associated with **p-ANCA** [1].

Q: What is the investigation of choice for diagnosing Zollinger-Ellison syndrome?

Endoscopic ultrasound. **Explanation:** Zollinger-Ellison Syndrome (ZES) is characterized by gastrin-secreting tumors (gastrinomas), typically located in the "gastrinoma triangle." While the initial biochemical diagnosis is made via fasting serum gastrin levels and secretin stimulation tests, **localization** of the tumor is crucial for surgical management. [1] **Why Endoscopic Ultrasound (EUS) is the correct answer:** EUS is currently considered the **investigation of choice for localizing small gastrinomas**, particularly those located in the pancreas. [2] It has a very high sensitivity (75–95%) for detecting lesions as small as 2–5 mm that are often missed by conventional imaging. When combined with Somatostatin Receptor Scintigraphy (SRS/Octreoscan) or Gallium-68 DOTATATE PET/CT, it provides the highest diagnostic yield. **Why other options are incorrect:** * **CT Scan and MRI:** While often the first-line imaging modalities used, they have low sensitivity (approx. 30–50%) for the small, often extrapancreatic (duodenal) tumors characteristic of ZES. [2] * **Selective Angiography:** This is an invasive procedure (e.g., the Secretin Angiography or SASI test). It is reserved for cases where non-invasive imaging fails to localize the tumor despite biochemical confirmation. **High-Yield Clinical Pearls for NEET-PG:** * **Gastrinoma Triangle (Passaro’s Triangle):** Junction of cystic/common bile duct, junction of 2nd and 3rd portions of the duodenum, and the neck/body of the pancreas. 90% of tumors are found here. * **Rule of 2/3rds:** 2/3 are malignant, 2/3 are located in the gastrinoma triangle, and 1/4 are associated with **MEN-1 syndrome**. * **Most common site:** Historically the pancreas, but recent data suggests the **duodenum** is the most common site for primary gastrinomas. * **Screening Test:** Fasting Serum Gastrin (>1000 pg/mL is diagnostic). * **Confirmatory Test:** Secretin Stimulation Test (increase in gastrin >200 pg/mL).

Question 1

Which is the earliest marker of hepatocellular failure?

Accepted Answer

Increased Prothrombin Time (PT)

Answer

Abnormal Prothrombin Time (PTT)

Answer

Decreased Albumin: Globulin ratio

Answer

Increased ammonia

Question 2

A patient with chronic liver disease developed spider naevi dilation on the chest. It may be due to excess of the following hormone:

Accepted Answer

Estrogen

Answer

Testosterone

Answer

Aldosterone

Answer

Hepatotoxin

Question 3

Which of the following is NOT seen in Crohn's disease?

Accepted Answer

Endomyseal antibodies

Answer

ASCA+

Answer

Skip lesions

Answer

Cobblestone appearance

Question 4

A 45-year-old man presents with mild difficulty in swallowing and a bitter sensation in the mouth. He has a 5-year history of gastroesophageal reflux disease (GERD) and is compliant with his medications. Endoscopic findings indicate benign pathology. Which of the following findings is most likely?

Accepted Answer

Esophageal strictures

Answer

Esophageal smooth muscle atrophy

Answer

Esophageal webs

Answer

Intestinal metaplasia

Question 5

A 45-year-old chronic alcoholic male with severe ascites presents with a history of passing bright red blood in his stools for the past 3 days. There was no abdominal pain or diarrhea. What would you suspect in this case?

Accepted Answer

Hemorrhoids

Answer

Intestinal infarction

Answer

Chronic ischemic colitis

Answer

Angiodysplasia

Question 6

A 30-year-old male patient with cholelithiasis is found to have serum bilirubin 2.5 mg/dL, Hb 6 g/dL, and urine test positive for urobilinogen. What is the most likely diagnosis?

Accepted Answer

Hemolytic jaundice

Answer

Obstructive jaundice

Answer

Hepatocellular jaundice

Answer

Erythropoietic Protoporphyria

Question 7

A patient with a known history of ulcerative colitis presents to the emergency department with abdominal distension and tenderness. An abdominal X-ray was performed. Which of the following is true regarding the patient's condition?

Accepted Answer

Toxic megacolon

Answer

Toxic megacolon is rarely seen in ulcerative colitis

Answer

Sigmoid volvulus

Answer

Adhesions

Question 8

Enlarged liver with hepatocellular dysfunction is seen in which of the following conditions?

Accepted Answer

All of the above

Answer

Wilson's disease

Answer

Budd-Chiari syndrome

Answer

NASH

Question 9

Yellowish exudates at multiple sites seen in colonoscopy indicates:

Accepted Answer

Crohn's disease

Answer

Hirschsprung disease

Answer

Tuberculosis

Answer

Lymphoma

Question 10

What is the investigation of choice for diagnosing Zollinger-Ellison syndrome?

Accepted Answer

Endoscopic ultrasound

Answer

CT scan

Answer

Selective angiography

Answer

MRI

Gastroenterology — MCQs

Gastroenterology — MCQs

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