Gastroenterology Practice Questions

Q: Which of the following factors does NOT precipitate hepatic encephalopathy?

Magnesium trisilicate therapy. **Explanation:** Hepatic encephalopathy (HE) is a reversible neuropsychiatric syndrome caused by the accumulation of nitrogenous substances (like ammonia) in the blood due to liver failure or portosystemic shunting. **Why Magnesium Trisilicate is the correct answer:** Magnesium trisilicate is a non-absorbable antacid used to treat dyspepsia. Unlike other medications, it does not alter the acid-base balance or nitrogenous load in the body. Therefore, it does **not** precipitate HE. In contrast, medications like **sedatives, hypnotics, and diuretics** are common triggers. **Why the other options are wrong (Precipitating Factors):** * **Infection (Option A):** Sepsis or Spontaneous Bacterial Peritonitis (SBP) increases tissue catabolism and impairs renal function, leading to increased ammonia production. * **Hypokalemia (Option C):** Low potassium levels induce intracellular acidosis in renal tubular cells. This stimulates the enzyme glutaminase, which increases **renal ammoniagenesis** (production of NH3). NH3 then crosses the blood-brain barrier, worsening encephalopathy. * **Gastrointestinal Bleeding (Option D):** Blood in the GI tract provides a massive protein load (hemoglobin). Bacteria in the gut break down this protein into ammonia, which is then absorbed into the portal circulation. **NEET-PG High-Yield Pearls:** * **Most common trigger:** Infection and GI bleeding are the most frequent precipitants. * **Metabolic alkalosis:** Often co-exists with hypokalemia; it shifts the equilibrium from NH4+ (ammonium) to NH3 (ammonia), allowing it to cross the blood-brain barrier more easily. * **Treatment Gold Standard:** Lactulose (converts NH3 to non-absorbable NH4+) and Rifaximin (reduces ammonia-producing gut flora). * **Avoid:** Constipation is a major precipitant; ensure regular bowel movements.

Q: Steroid refractory ulcerative colitis is defined as active disease despite treatment with which of the following regimens?

Prednisolone up to 0.75 mg/kg/day over 4 weeks. **Explanation:** In the management of Ulcerative Colitis (UC), defining steroid responsiveness is crucial for determining when to escalate to second-line therapies (like Infliximab or Cyclosporine). [1] **Steroid-refractory Ulcerative Colitis** is defined as the presence of active disease despite an adequate course of corticosteroids. According to standard clinical guidelines (including Harrison’s Principles of Internal Medicine and ECCO guidelines), this is specifically defined as: * **Prednisolone up to 0.75 mg/kg/day** (or equivalent) administered orally for a period of **4 weeks**. [1] * Alternatively, in acute severe cases, it refers to a lack of response to intravenous steroids (e.g., Hydrocortisone or Methylprednisolone) within 3–7 days. **Analysis of Options:** * **Option A (0.5 mg/kg):** This dose is considered sub-therapeutic for inducing remission in moderate-to-severe flares; therefore, failure at this dose does not meet the criteria for "refractory" disease. * **Option C & D (1 mg/kg or 1.5 mg/kg):** While 1 mg/kg is often used in clinical practice for various autoimmune conditions, the specific consensus definition for UC refractory status is pegged at the 0.75 mg/kg threshold to balance efficacy with the significant side-effect profile of higher doses. **High-Yield Clinical Pearls for NEET-PG:** * **Steroid-Dependent UC:** Disease that responds to steroids but relapses when the dose is tapered below 10 mg/day or within 3 months of stopping. * **First-line for Mild-Moderate UC:** Topical or oral 5-ASA (Mesalamine). [1] * **Indication for Surgery:** Toxic megacolon, perforation, or refractory disease. [1] * **Drug of Choice for Acute Severe UC (Steroid Refractory):** IV Cyclosporine or Infliximab ("Rescue therapy").

Q: Large discrete ulcers in the esophagus are seen in which of the following conditions?

CMV esophagitis. **Explanation:** The correct answer is **CMV esophagitis**. **1. Why CMV Esophagitis is Correct:** Cytomegalovirus (CMV) esophagitis is a common opportunistic infection in immunocompromised patients (e.g., HIV/AIDS with CD4 <50 cells/µL or transplant recipients). Endoscopically, it is characterized by **large, solitary, shallow, and discrete (well-demarcated) ulcers**, typically located in the distal esophagus. Histologically, it shows **intranuclear and intracytoplasmic inclusions** (classic "Owl’s eye" appearance) within endothelial cells or fibroblasts. **2. Why Other Options are Incorrect:** * **Achalasia Cardia:** This is a motility disorder characterized by the failure of the Lower Esophageal Sphincter (LES) to relax [1]. Endoscopy usually shows a dilated esophagus with retained food particles, not discrete ulcers. * **Plummer-Vinson Syndrome:** This presents with a triad of iron deficiency anemia, glossitis, and **esophageal webs** (post-cricoid region). It is a premalignant condition but does not typically present with large discrete ulcers. * **Esophageal Carcinoma:** While malignancy can cause ulceration, it usually presents as an irregular, friable, fungating mass or a deep, ragged malignant ulcer with heaped-up margins, rather than "discrete" ulcers. **3. NEET-PG High-Yield Pearls:** * **CMV vs. Herpes (HSV) Esophagitis:** This is a frequent "differentiating" question. * **CMV:** Large, shallow, solitary/discrete ulcers. * **HSV:** Small, multiple, deep, "punched-out" ulcers (Volcano ulcers). * **Drug of Choice:** Ganciclovir is the treatment of choice for CMV esophagitis. * **Candida Esophagitis:** The most common infectious esophagitis; presents as white, adherent plaques (cottage-cheese appearance) [2].

Q: Which of the following is NOT a cause of acute pancreatitis?

Starvation. Explanation: Acute pancreatitis is an inflammatory condition of the pancreas characterized by the premature activation of digestive enzymes (trypsinogen to trypsin) within the pancreatic acini, leading to autodigestion [1]. Why Starvation is the Correct Answer: Starvation is **not** a cause of acute pancreatitis. In fact, pancreatic rest (NPO status) is a cornerstone of management to reduce enzyme secretion. Conversely, **hypertriglyceridemia** (specifically levels >1000 mg/dL) and **refeeding syndrome** (after prolonged starvation) are known triggers, but starvation itself does not initiate the inflammatory cascade. Analysis of Incorrect Options: * **Gallstones (Option A):** The most common cause worldwide (approx. 40%) [1]. Obstruction of the ampulla of Vater increases pancreatic ductal pressure, triggering enzyme activation. * **Alcohol (Option B):** The second most common cause. Ethanol exerts a direct toxic effect on acinar cells and increases the permeability of ductules [1]. * **Hypercalcemia (Option C):** A recognized metabolic cause. High calcium levels promote the activation of trypsinogen to trypsin and can lead to the formation of calcium deposits in the pancreatic duct. NEET-PG High-Yield Pearls: * **Mnemonic for Causes:** **I GET SMASHED** (Idiopathic, Gallstones, Ethanol, Trauma, Steroids, Mumps/Malignancy, Autoimmune, Scorpion sting, Hypercalcemia/Hypertriglyceridemia, ERCP, Drugs like Azathioprine/Thiazides) [1]. * **Most Common Cause:** Gallstones (Overall); Alcohol (in males). * **Drug of Choice for Pain:** NSAIDs or Opioids (Hydromorphone/Fentanyl). *Note: Morphine is traditionally avoided due to theoretical Sphincter of Oddi spasm, though clinical evidence is limited.* * **Sentinel Loop:** A localized ileus of the jejunum seen on X-ray, indicating underlying pancreatitis.

Q: Which of the following is considered an extra-intestinal manifestation of inflammatory bowel disease?

Osteoarthritis. The correct answer is **C. Osteoarthritis**. In the context of Inflammatory Bowel Disease (IBD), joint involvement is the most common extra-intestinal manifestation (EIM). However, the specific types of joint disease associated with IBD are **inflammatory** in nature, such as **Peripheral Arthritis** (Type I and Type II) and **Ankylosing Spondylitis** [1]. **Osteoarthritis** is a degenerative joint disease characterized by "wear and tear" of cartilage; it is not an immune-mediated manifestation of IBD. **Analysis of Options:** * **A. Uveitis:** A common ocular EIM of IBD (more frequent in Crohn’s) [2]. It presents with eye pain, photophobia, and blurred vision and requires urgent treatment to prevent blindness. * **B. Sclerosing Cholangitis:** Specifically **Primary Sclerosing Cholangitis (PSC)** is a classic hepatobiliary EIM, strongly associated with Ulcerative Colitis (UC). It is characterized by fibrotic strictures of the bile ducts. * **D. Skin Nodules:** These refer to **Erythema Nodosum**, the most common skin manifestation of IBD. They are painful, red nodules typically found on the pretibial surface (shins) and often correlate with bowel disease activity. **NEET-PG High-Yield Pearls:** 1. **Activity Correlation:** Erythema Nodosum and Type I Peripheral Arthritis (pauciarticular) usually parallel the activity of the intestinal inflammation [1]. 2. **Independence from Activity:** Ankylosing Spondylitis, Sacroiliitis, and Primary Sclerosing Cholangitis follow a course **independent** of the bowel disease activity [1]. 3. **HLA Association:** HLA-B27 is strongly linked to axial involvement (Ankylosing Spondylitis) in IBD patients [2]. 4. **Pyoderma Gangrenosum:** A more severe, necrotic skin ulceration associated with IBD (mostly UC) that does not always correlate with bowel activity.

Question 1

A chronic alcoholic presents with regurgitation and retrosternal pain. Endoscopic biopsy confirms Barrett's oesophagus. What is the most appropriate management in this case?

Accepted Answer

Endoscopic biopsy every 2 years

Answer

Proton pump inhibitor (PPI)

Answer

Helicobacter pylori treatment

Answer

Balloon dilatation

Question 2

Which of the following factors does NOT precipitate hepatic encephalopathy?

Accepted Answer

Magnesium trisilicate therapy

Answer

Infection

Answer

Hypokalemia

Answer

Gastrointestinal bleeding

Question 3

Steroid refractory ulcerative colitis is defined as active disease despite treatment with which of the following regimens?

Accepted Answer

Prednisolone up to 0.75 mg/kg/day over 4 weeks

Answer

Prednisolone up to 0.5 mg/kg/day over 4 weeks

Answer

Prednisolone up to 1 mg/kg/day over 4 weeks

Answer

Prednisolone up to 1.5 mg/kg/day over 4 weeks

Question 4

Large discrete ulcers in the esophagus are seen in which of the following conditions?

Accepted Answer

CMV esophagitis

Answer

Achalasia cardia

Answer

Plummer Vinson syndrome

Answer

Esophageal carcinoma

Question 5

Which of the following is NOT a cause of acute pancreatitis?

Accepted Answer

Starvation

Answer

Gallstones

Answer

Alcohol

Answer

Hypercalcemia

Question 6

In the setting of cirrhosis and ascites, Spontaneous Bacterial Peritonitis (SBP) is best treated with cefotaxime injection. What is the next best oral alternative drug for its treatment?

Accepted Answer

Ofloxacin

Answer

Norfloxacin

Answer

Ciprofloxacin

Answer

Pefloxacin

Question 7

Which of the following is considered an extra-intestinal manifestation of inflammatory bowel disease?

Accepted Answer

Osteoarthritis

Answer

Uveitis

Answer

Sclerosing cholangitis

Answer

Skin nodules

Question 8

Diarrhoea with ulcer responding to PPI is seen in which of the following conditions?

Accepted Answer

Zollinger Ellison syndrome

Answer

MEN 1 syndrome

Answer

H. pylori infection

Answer

VIPoma

Question 9

Which of the following is NOT a cause of secretory diarrhea?

Accepted Answer

Lactose intolerance

Answer

Vibrio cholera

Answer

Inflammatory bowel disease

Answer

Gastrinoma

Question 10

Small intestinal stricture is not seen in which of the following conditions?

Accepted Answer

Lymphoma

Answer

Typhoid

Answer

Tumour

Answer

Tuberculosis

Gastroenterology — MCQs

Gastroenterology — MCQs

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