Gastroenterology Practice Questions

Q: Punctate yellow exudates in the colon, found on endoscopic examination, are indicative of which of the following?

Antibiotic-associated colitis. ### **Explanation** The correct answer is **Antibiotic-associated colitis (Pseudomembranous colitis)**. **1. Why the Correct Answer is Right:** Antibiotic-associated colitis, most commonly caused by **_Clostridioides difficile_ (C. diff)** toxins, is characterized by the formation of **pseudomembranes**. On endoscopic examination (sigmoidoscopy or colonoscopy), these appear as classic **punctate yellow-white exudates** or plaques scattered over the colonic mucosa [1]. These plaques are composed of fibrin, inflammatory cells (neutrophils), and necrotic debris. As the disease progresses, these small punctate spots can coalesce to form larger membranes. **2. Why the Incorrect Options are Wrong:** * **Balantidium coli:** This parasitic infection typically causes **flask-shaped ulcers** (similar to Amoebiasis) rather than yellow exudative plaques. * **Ulcerative colitis:** Endoscopy typically reveals continuous mucosal inflammation starting from the rectum, characterized by **loss of vascular markings, friability, and "lead-pipe" appearance** in chronic cases [1]. It does not present with punctate yellow exudates. * **Gluten-induced enteropathy (Celiac Disease):** This primarily affects the **small intestine** (duodenum/jejunum). Endoscopic findings include scalloping of folds, fissuring, and a mosaic pattern, not colonic exudates. **3. High-Yield Clinical Pearls for NEET-PG:** * **Risk Factor:** Most common after the use of **Clindamycin**, Fluoroquinolones, or 3rd generation Cephalosporins [1]. * **Diagnosis:** The gold standard for diagnosis is the detection of **C. diff toxin A and B** in the stool via PCR or EIA [1]. * **Histology:** Look for the characteristic **"Volcano lesion"** (an eruption of fibrin and PMNs from an ulcerated crypt). * **Treatment:** First-line treatment is oral **Vancomycin** or **Fidaxomicin**. Metronidazole is now reserved for non-severe cases where other options are unavailable.

Q: What is the usual maximum dose of furosemide and spironolactone in patients with cirrhosis and portal hypertension?

Furosemide 160 mg and spironolactone 400 mg. In patients with cirrhosis and portal hypertension, ascites develops due to secondary hyperaldosteronism and sodium retention. The standard medical management involves a combination of **Spironolactone** (an aldosterone antagonist) and **Furosemide** (a loop diuretic). **1. Why Option A is Correct:** The goal of therapy is to maintain a **100:40 ratio** of Spironolactone to Furosemide. This specific ratio is clinically proven to maintain normokalemia by balancing the potassium-sparing effect of spironolactone with the potassium-wasting effect of furosemide. * **Starting Dose:** 100 mg Spironolactone and 40 mg Furosemide. * **Maximum Dose:** The doses are titrated every 3–5 days if weight loss is inadequate, up to a maximum of **400 mg Spironolactone and 160 mg Furosemide**. **2. Why Other Options are Incorrect:** * **Options B & C:** These violate the established 100:40 ratio. Using disproportionate doses increases the risk of electrolyte imbalances (hyperkalemia if spironolactone is too high, or hypokalemia if furosemide is too high). * **Option D:** While 200 mg/80 mg is a common intermediate step in titration, it is not the "maximum" dose defined by clinical guidelines (AASLD/EASL). **Clinical Pearls for NEET-PG:** * **Weight Loss Goal:** Aim for 0.5 kg/day in patients without edema and 1.0 kg/day in those with peripheral edema. * **Side Effect:** Gynecomastia is a common side effect of spironolactone; if it occurs, it can be switched to **Amiloride**. * **Refractory Ascites:** Defined when ascites cannot be mobilized despite the maximum doses (400mg/160mg) or when diuretic-induced complications (e.g., encephalopathy, creatinine >2.0 mg/dL) occur. Note: Although references discuss portal hypertension and sodium retention [1][2], they do not explicitly define the 400mg/160mg dosage maximum in the provided snippets.

Q: Gastric infection with H.pylori accounts for all of the following adverse events, EXCEPT:

GERD. **Explanation:** *Helicobacter pylori* is a gram-negative, microaerophilic bacterium that colonizes the gastric mucosa, leading to chronic inflammation [1]. While it is a primary risk factor for several gastric pathologies, it is **not** a cause of Gastroesophageal Reflux Disease (GERD). **Why GERD is the correct answer:** Epidemiological studies suggest an **inverse relationship** between *H. pylori* infection and GERD. *H. pylori* (especially CagA+ strains) often causes atrophic gastritis, which leads to **hypochlorhydria** (decreased acid production). Lower gastric acidity means the refluxate is less caustic to the esophagus, potentially acting as a "protective" factor against GERD and its complications, such as Barrett’s esophagus and esophageal adenocarcinoma. **Why other options are incorrect:** * **Peptic Ulcer Disease (PUD):** *H. pylori* is the most common cause of PUD. It increases gastrin secretion (in antral-predominant gastritis) and weakens mucosal defenses, leading to duodenal and gastric ulcers [1]. * **Gastric MALT Lymphoma:** *H. pylori* provides the chronic antigenic stimulation required for the proliferation of B-cells in the gastric mucosa [1]. It is unique because early-stage MALT lymphoma can often be **cured** simply by eradicating the infection. * **Gastric Adenocarcinoma:** *H. pylori* is classified as a **Group 1 Carcinogen**. It triggers the "Correa Cascade" (Chronic gastritis → Atrophy → Intestinal metaplasia → Dysplasia → Adenocarcinoma). **High-Yield Clinical Pearls for NEET-PG:** * **Most common site** of *H. pylori* colonization: Gastric Antrum. * **Investigation of choice (Non-invasive):** Urea Breath Test (used for diagnosis and confirming eradication) [1]. * **Gold Standard diagnosis:** Endoscopic biopsy followed by Rapid Urease Test (RUT) or Histopathology [1]. * **Eradication:** Standard Triple Therapy includes a PPI + Amoxicillin + Clarithromycin for 14 days [1].

Q: What is the investigation of choice for amoebic liver abscess?

Serum Entamoeba antibodies. **Explanation:** Amoebic Liver Abscess (ALA) is the most common extra-intestinal manifestation of infection by *Entamoeba histolytica*. **Why Serum Entamoeba Antibodies is the Correct Answer:** Serology is the investigation of choice because it is highly sensitive (>90-95%) and specific. In endemic areas, a high titer of anti-amoebic antibodies in a patient with a space-occupying lesion in the liver is diagnostic. These antibodies appear early in the course of the disease (within 7-10 days) and are crucial because the parasite is rarely found in the stool or the abscess pus itself. **Analysis of Incorrect Options:** * **A. Demonstration of parasites in stool:** Only 15-30% of patients with ALA have concurrent intestinal amoebiasis. A negative stool microscopy does not rule out a liver abscess. * **C. Aspiration of cyst fluid:** This is not the first-line investigation. Aspiration is typically reserved for cases with a high risk of rupture, diagnostic uncertainty (to rule out pyogenic abscess), or failure to respond to medical therapy. If performed, it reveals "anchovy sauce" pus, but trophozoites are rarely seen as they reside in the abscess wall. * **D. X-ray abdomen:** This may show non-specific findings like an elevated right hemidiaphragm or basal atelectasis, but it is not diagnostic. **High-Yield Clinical Pearls for NEET-PG:** * **Most common site:** Right lobe of the liver (due to the bulk of blood flow from the superior mesenteric vein). * **Gold Standard for Diagnosis:** While serology is the investigation of choice, **Ultrasound** is the initial imaging modality of choice. * **Treatment of Choice:** **Metronidazole** (or Tinidazole) followed by a luminal amoebicide (e.g., Paromomycin or Diloxanide furoate) to eradicate the intestinal colonization. * **Key distinction:** Unlike pyogenic abscesses, ALA is usually solitary and occurs in younger males.

Q: A patient with leukemia on chemotherapy develops acute right lower abdominal pain associated with anemia, thrombocytopenia, and leukopenia. What is the clinical diagnosis?

Neutropenic colitis. **Explanation:** **Neutropenic Colitis (Typhlitis)** is the correct diagnosis. It is a life-threatening necrotizing inflammation of the cecum and ascending colon that typically occurs in immunocompromised patients, particularly those with **hematologic malignancies (leukemia)** undergoing intensive chemotherapy. 1. **Why it is correct:** The clinical triad of **fever, neutropenia (leukopenia), and right lower quadrant (RLQ) pain** in a patient on chemotherapy is classic for Neutropenic Colitis. The pathogenesis involves mucosal injury by chemotherapy, profound neutropenia (Absolute Neutrophil Count <500/mm³), and subsequent bacterial or fungal invasion of the bowel wall. The cecum is primarily involved due to its distensibility and limited vascular supply. 2. **Why other options are incorrect:** * **Appendicitis:** While it presents with RLQ pain, the presence of severe myelosuppression (anemia, thrombocytopenia, leukopenia) in a chemotherapy patient strongly favors typhlitis. Surgery for appendicitis in a neutropenic/thrombocytopenic patient is high-risk [1]. * **Leukemic Colitis:** This refers to direct infiltration of the bowel wall by leukemic cells, which is less common than inflammatory/infectious complications during the neutropenic phase. * **Perforation Peritonitis:** While this can be a *complication* of neutropenic colitis, the initial clinical presentation described is more consistent with the primary inflammatory process. **NEET-PG High-Yield Pearls:** * **Investigation of Choice:** **CT Scan of the abdomen** (shows cecal wall thickening >4mm, pericolic fat stranding, or pneumatosis intestinalis). * **Management:** Primarily medical (bowel rest, IV fluids, broad-spectrum antibiotics). Surgery is reserved for perforation, uncontrolled hemorrhage, or clinical deterioration [1]. * **Key Risk Factor:** Absolute Neutrophil Count (ANC) < 500 cells/μL.

Q: A patient presents with recurrent diarrhea, pseudopolyps, and a lead pipe appearance on barium enema. What is the most likely diagnosis?

Ulcerative colitis. ### Explanation The clinical presentation and radiological findings are classic for **Ulcerative Colitis (UC)** [3]. **1. Why Ulcerative Colitis is Correct:** Ulcerative colitis is a chronic inflammatory bowel disease characterized by continuous mucosal inflammation starting from the rectum and extending proximally [3]. * **Lead Pipe Appearance:** This is a pathognomonic radiological sign on barium enema caused by the loss of normal colonic haustrations, shortening of the colon, and mural thickening due to chronic inflammation [3]. * **Pseudopolyps:** These are islands of regenerating or normal residual mucosa surrounded by areas of extensive ulceration [3]. They are a hallmark of chronic UC. * **Recurrent Diarrhea:** Typically presents as bloody diarrhea with mucus and tenesmus [4]. **2. Analysis of Incorrect Options:** * **Crohn’s Disease:** Characterized by "skip lesions," transmural inflammation, and a "cobblestone appearance." Barium studies typically show the "String sign of Kantor" (terminal ileal narrowing), not a lead pipe appearance [1]. * **Irritable Bowel Syndrome (IBS):** A functional disorder without structural or inflammatory changes. Barium enema and endoscopy would be completely normal. * **Short Bowel Syndrome:** A malabsorptive state following extensive surgical resection of the small intestine. It does not present with pseudopolyps or the lead pipe sign. **3. NEET-PG High-Yield Pearls:** * **Backwash Ileitis:** Involvement of the terminal ileum in UC (occurs in pancolitis). * **Microscopy:** Look for **Crypt Abscesses** (neutrophils in crypt lumina) [2][3]. * **Smoking Paradox:** Smoking is protective in UC but a risk factor for Crohn’s. * **Complication:** Toxic Megacolon is a life-threatening complication of UC. * **Marker:** p-ANCA is frequently positive in UC, whereas ASCA is associated with Crohn’s.

Question 1

A 22-year-old woman presents with a 3-day history of dark urine and abdominal distension. On examination, she is alert with icterus and normal heart and lung sounds. Laboratory findings include: Hematocrit: 26%, Reticulocytes: 5%, Platelets: 1.3 lakhs, Alkaline Phosphatase: 30 units/L, ALT: 110 units/L, AST: 220 units/L, Total Bilirubin: 13 mg% (Direct: 4 mg). HBsAg is positive, while Hepatitis A and C are negative. Urine drug screen is negative. Abdominal ultrasound shows a nodular liver and an enlarged spleen. What is the most likely diagnosis?

Accepted Answer

Wilson disease

Answer

Acetaminophen intoxication

Answer

Acute viral hepatitis

Answer

Primary biliary cirrhosis

Question 2

Punctate yellow exudates in the colon, found on endoscopic examination, are indicative of which of the following?

Accepted Answer

Antibiotic-associated colitis

Answer

Balantidium coli

Answer

Ulcerative colitis

Answer

Gluten-induced enteropathy

Question 3

What is the usual maximum dose of furosemide and spironolactone in patients with cirrhosis and portal hypertension?

Accepted Answer

Furosemide 160 mg and spironolactone 400 mg

Answer

Furosemide 80 mg and spironolactone 400 mg

Answer

Furosemide 160 mg and spironolactone 200 mg

Answer

Furosemide 80 mg and spironolactone 200 mg

Question 4

Which of the following is NOT a predictor of treatment failure within 5 days in cirrhotic patients with variceal bleeding?

Accepted Answer

Prolonged prothrombin time

Answer

Hepatic venous pressure gradient (HVPG) > 20 mm Hg

Answer

Child class C status

Answer

Active bleeding observed during endoscopy

Question 5

Gastric infection with H.pylori accounts for all of the following adverse events, EXCEPT:

Accepted Answer

GERD

Answer

Peptic ulcer disease

Answer

Gastric MALT lymphoma

Answer

Gastric adenocarcinoma

Question 6

What is the investigation of choice for amoebic liver abscess?

Accepted Answer

Serum Entamoeba antibodies

Answer

Demonstration of parasites in stool

Answer

Aspiration of cyst fluid

Answer

X-ray abdomen

Question 7

A patient with leukemia on chemotherapy develops acute right lower abdominal pain associated with anemia, thrombocytopenia, and leukopenia. What is the clinical diagnosis?

Accepted Answer

Neutropenic colitis

Answer

Appendicitis

Answer

Leukemic colitis

Answer

Perforation peritonitis

Question 8

A patient presents with recurrent diarrhea, pseudopolyps, and a lead pipe appearance on barium enema. What is the most likely diagnosis?

Accepted Answer

Ulcerative colitis

Answer

Crohn's disease

Answer

Irritable bowel syndrome

Answer

Short bowel syndrome

Question 9

Which of the following viral infections is associated with the highest risk of progression to fulminant disease and acute liver failure?

Accepted Answer

Hepatitis D virus (HDV) /Hepatitis B virus (HBV) superinfection

Answer

Hepatitis E virus (HEV) infection

Answer

Hepatitis B virus (HBV) infection

Answer

Hepatitis B virus (HBV)/Hepatitis D virus (HDV) coinfection

Question 10

A 65-year-old female presented to the OPD with a complaint of abdominal pain immediately after eating, episodes of vomiting, and diarrhea. She has a 20-year history of coronary artery disease. Her BP is 160/100 mm Hg and pulse is 80/min. On abdominal examination, there is no tenderness or rigidity. What is the most likely diagnosis?

Accepted Answer

Chronic mesenteric ischemia

Answer

Peptic ulcer

Answer

Wilkie's disease

Answer

Ulcerative colitis

Gastroenterology — MCQs

Gastroenterology — MCQs

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