Gastroenterology — MCQs

Gastroenterology Indian Medical PG Practice Questions and MCQs

Question 51: Which of the following is NOT a cause of transudate ascites?

A. Tuberculosis (Correct Answer)
B. Nephrotic syndrome
C. Hypoproteinemia
D. Congestive cardiac failure

Explanation: ### Explanation The classification of ascites is primarily determined by the **Serum-Ascites Albumin Gradient (SAAG)**. A SAAG score **≥ 1.1 g/dL** indicates portal hypertension (Transudate), while a score **< 1.1 g/dL** indicates non-portal hypertensive causes (Exudate). **1. Why Tuberculosis is the Correct Answer:** Tuberculosis (TB) peritonitis is a classic cause of **exudative ascites**. In TB, the inflammation of the peritoneal lining increases capillary permeability, allowing proteins and cells to leak into the peritoneal cavity. This results in a **high protein content (> 2.5 g/dL)** and a **low SAAG (< 1.1 g/dL)**. **2. Analysis of Incorrect Options (Causes of Transudate):** * **Nephrotic Syndrome & Hypoproteinemia:** These conditions lead to a decrease in **plasma oncotic pressure** due to low serum albumin. This allows fluid to leak into the interstitium and peritoneal space. Since the primary pathology is a lack of protein, the resulting fluid is a protein-poor transudate. * **Congestive Cardiac Failure (CCF):** CCF causes increased systemic venous pressure, which is transmitted to the hepatic veins (post-sinusoidal hypertension). This increased **hydrostatic pressure** forces fluid out of the vessels, resulting in a transudate (typically with a high SAAG). **3. NEET-PG High-Yield Pearls:** * **SAAG Formula:** Serum Albumin – Ascitic Fluid Albumin. * **High SAAG (≥ 1.1):** Cirrhosis (most common), CCF, Budd-Chiari syndrome, Portal vein thrombosis. * **Low SAAG (< 1.1):** TB, Malignancy, Pancreatitis, Nephrotic syndrome (Note: Nephrotic syndrome is unique as it is a transudate but often has a low SAAG because serum albumin is also very low). * **TB Ascites Gold Standard:** Peritoneal biopsy showing granulomas; however, **ADA (Adenosine Deaminase)** levels > 30-40 U/L in ascitic fluid is a highly sensitive screening marker.

Question 52: Which of the following is NOT a predictor of treatment failure within 5 days in cirrhotic patients with variceal bleeding?

A. Hepatic venous pressure gradient (HVPG) > 20 mm Hg
B. Child class C status
C. Active bleeding observed during endoscopy
D. Prolonged prothrombin time (Correct Answer)

Explanation: In the management of acute variceal bleeding, identifying patients at high risk for treatment failure is crucial for deciding on early interventions like a Pre-emptive TIPS (Transjugular Intrahepatic Portosystemic Shunt) [1]. ### **Why "Prolonged Prothrombin Time" is the Correct Answer** While a prolonged prothrombin time (PT/INR) is a component of the Child-Pugh score and reflects liver synthetic dysfunction, it is **not** an independent predictor of treatment failure within 5 days [1]. In acute bleeding, PT/INR is often influenced by acute-on-chronic factors and does not directly correlate with the hemodynamic pressure within the portal system or the immediate success of endoscopic/pharmacological therapy. ### **Analysis of Incorrect Options (Predictors of Failure)** * **HVPG > 20 mm Hg:** This is the **strongest predictor** of early rebleeding and failure to control bleeding [1]. High portal pressure directly correlates with the risk of variceal rupture and inability of the clot to stabilize. * **Child Class C Status:** Patients with advanced cirrhosis (Child-Pugh C) have poor physiological reserve and severe portal hypertension, making them significantly more likely to fail standard medical and endoscopic therapy [1]. * **Active Bleeding at Endoscopy:** Seeing a "spurter" or active ooze during the procedure indicates a high-pressure system and is a documented risk factor for failure of primary hemostasis within the first 5 days. ### **High-Yield Clinical Pearls for NEET-PG** * **Definition of Treatment Failure:** Failure to control bleeding within 24 hours or rebleeding within 5 days despite standard care (Vasoconstrictors + Endoscopic Band Ligation + Antibiotics) [1]. * **Early TIPS (Pre-emptive):** Indicated within 72 hours (ideally <24h) for high-risk patients: Child-Pugh C (<14 points) or Child-Pugh B with active bleeding [1]. * **Baveno VII Criteria:** Emphasizes that HVPG > 20 mmHg is the gold standard for predicting failure, though Child-Pugh scores are more commonly used in clinical practice [1].

Question 53: Gastric infection with H.pylori accounts for all of the following adverse events, EXCEPT:

A. Peptic ulcer disease
B. Gastric MALT lymphoma
C. GERD (Correct Answer)
D. Gastric adenocarcinoma

Explanation: **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].

Question 54: What is the investigation of choice for amoebic liver abscess?

A. Demonstration of parasites in stool
B. Serum Entamoeba antibodies (Correct Answer)
C. Aspiration of cyst fluid
D. X-ray abdomen

Explanation: **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.

Question 55: All the following can be used to predict severe acute pancreatitis except?

A. Glasgow score > 3
B. CT severity score > 7
C. APACHE-II score > 8
D. Serum lipase > 5 times the normal (Correct Answer)

Explanation: **Explanation:** The severity of acute pancreatitis is determined by the presence of **organ failure** (respiratory, renal, or cardiovascular) and **local complications** (necrosis, pseudocyst, or abscess), rather than the absolute level of pancreatic enzymes [1]. **Why Option D is the Correct Answer:** Serum amylase and lipase levels are essential for the **diagnosis** of acute pancreatitis (requiring a rise of >3 times the upper limit of normal). However, the magnitude of the elevation does **not** correlate with the severity of the disease, the prognosis, or the extent of pancreatic necrosis. A patient with a five-fold increase may have mild interstitial pancreatitis, while a patient with a massive necrotizing process may show only a modest rise. **Analysis of Incorrect Options:** * **APACHE-II Score > 8:** This is a gold-standard physiological scoring system. A score ≥ 8 at any point during the first 48 hours is a reliable predictor of severe disease and increased mortality. * **Glasgow (Imrie) Score > 3:** Similar to the Ranson criteria, this uses clinical and laboratory parameters (Age, WBC, Glucose, Urea, etc.). A score of 3 or more indicates severe pancreatitis [1]. * **CT Severity Score (Balthazar) > 7:** This combines the grade of pancreatitis with the percentage of pancreatic necrosis. A score of 7–10 is associated with high morbidity and mortality [1]. **Clinical Pearls for NEET-PG:** * **BISAP Score:** A simple bedside tool (BUN, Impaired mental status, SIRS, Age >60, Pleural effusion). A score ≥ 3 predicts increased mortality. * **C-Reactive Protein (CRP):** The most useful single biochemical marker for predicting severity; levels **>150 mg/L** at 48 hours indicate severe pancreatitis. * **Most common cause of death:** In the first week, it is **SIRS/Organ failure**; after two weeks, it is **infected pancreatic necrosis** [1].

Question 56: A patient with leukemia on chemotherapy develops acute right lower abdominal pain associated with anemia, thrombocytopenia, and leukopenia. What is the clinical diagnosis?

A. Appendicitis
B. Leukemic colitis
C. Perforation peritonitis
D. Neutropenic colitis (Correct Answer)

Explanation: **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.

Question 57: What is the common site of regional enteritis?

A. Colon
B. Rectum
C. Distal ileum and colon (Correct Answer)
D. Caecum

Explanation: **Explanation:** Regional enteritis, commonly known as **Crohn’s Disease**, is a chronic inflammatory bowel disease (IBD) characterized by transmural inflammation that can involve any part of the gastrointestinal tract from the mouth to the anus [1]. **Why the correct answer is right:** The hallmark of Crohn’s disease is its predilection for the **distal (terminal) ileum and the proximal colon** [1]. Approximately 40–50% of patients present with involvement of both the small intestine and the colon (ileocolic distribution). Isolated small bowel involvement occurs in about 30%, while isolated colonic involvement occurs in about 20% of cases. **Analysis of incorrect options:** * **A. Colon:** While the colon is frequently involved (Crohn's colitis), it is rarely the *only* site compared to the combined ileocolic presentation [1]. * **B. Rectum:** This is a classic "distractor." In Crohn’s disease, the **rectum is often spared** (rectal sparing), which is a key feature used to differentiate it from Ulcerative Colitis, where the rectum is always involved [1]. * **D. Caecum:** While the caecum can be involved as part of ileocolic disease, it is not the most common site of the disease in isolation. **NEET-PG High-Yield Pearls:** * **Skip Lesions:** Crohn’s is characterized by discontinuous areas of inflammation, unlike the continuous spread of Ulcerative Colitis [1]. * **Transmural Inflammation:** Leads to complications like fistulae, strictures, and "creeping fat" (mesenteric fat wrapping around the bowel). * **Microscopy:** Presence of **non-caseating granulomas** is pathognomonic (seen in ~50% of biopsies). * **Cobblestone Appearance:** Deep longitudinal and transverse ulcers with intervening normal mucosa create a "cobblestone" look on endoscopy. * **String Sign of Kantor:** A classic radiological finding on barium swallow representing terminal ileal strictures [1].

Question 58: A patient presents with recurrent diarrhea, pseudopolyps, and a lead pipe appearance on barium enema. What is the most likely diagnosis?

A. Ulcerative colitis (Correct Answer)
B. Crohn's disease
C. Irritable bowel syndrome
D. Short bowel syndrome

Explanation: ### 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 59: Which of the following is NOT a feature of cirrhotic ascites?

A. Straw colour
B. Specific gravity < 1.060
C. Leucocyte count < 200/cu mm
D. Serum-ascitic albumin gradient < 1 (Correct Answer)

Explanation: **Explanation:** The correct answer is **D (Serum-ascitic albumin gradient < 1)** because cirrhotic ascites is characterized by a **High SAAG (Serum-Ascites Albumin Gradient) ≥ 1.1 g/dL**. ### 1. Why Option D is the Correct Answer (The Concept) The SAAG is the most reliable marker to distinguish between ascites caused by portal hypertension and other causes. It is calculated as: * **SAAG = (Serum Albumin) – (Ascitic Fluid Albumin)** In cirrhosis, portal hypertension increases hydrostatic pressure, forcing fluid (but not large proteins like albumin) into the peritoneal cavity. This results in a wide gap between serum and ascitic albumin levels. Therefore, a **SAAG ≥ 1.1 g/dL** is a hallmark of cirrhosis. A SAAG < 1.1 g/dL suggests non-portal hypertensive causes like malignancy or tuberculosis. ### 2. Why Other Options are Incorrect (Features of Cirrhosis) * **A. Straw colour:** Cirrhotic fluid is typically a clear, straw-colored serous fluid. If it is bloody, one should suspect malignancy; if cloudy, infection (SBP). * **B. Specific gravity < 1.016:** (Note: The option says 1.060, which is a typo for 1.016). Cirrhotic ascites is a **transudate**, meaning it has low protein content and low specific gravity (typically < 1.016). * **C. Leucocyte count < 250/cu mm:** Uncomplicated cirrhotic ascites has a low cell count. A polymorphonuclear (PMN) count **> 250 cells/mm³** is the diagnostic threshold for **Spontaneous Bacterial Peritonitis (SBP)**. ### 3. High-Yield Clinical Pearls for NEET-PG * **High SAAG (≥ 1.1):** Cirrhosis, Heart Failure, Budd-Chiari Syndrome, Portal vein thrombosis. * **Low SAAG (< 1.1):** Peritoneal TB, Malignancy, Nephrotic Syndrome, Pancreatitis. * **Total Protein in Ascites:** In Cirrhosis, it is usually < 2.5 g/dL. However, in Cardiac Ascites (High SAAG), the protein is often > 2.5 g/dL. * **Gold Standard Treatment:** Salt restriction and diuretics (Spironolactone is the drug of choice).

Question 60: In Wilson disease, hepatic copper content usually exceeds which of the following values per gram of dry weight?

A. 200 mg/g
B. 250 mg/g (Correct Answer)
C. 300 mg/g
D. 350 mg/g

Explanation: **Explanation:** Wilson disease (Hepatolenticular degeneration) is an autosomal recessive disorder caused by a mutation in the **ATP7B gene** on chromosome 13. This defect leads to impaired biliary excretion of copper and its subsequent accumulation in various organs, primarily the liver and brain [1]. **Why Option B is Correct:** The gold standard for diagnosing Wilson disease is the measurement of hepatic copper concentration via liver biopsy. In healthy individuals, the copper content is typically <50 µg/g of dry weight. In patients with Wilson disease, the concentration **usually exceeds 250 µg/g dry weight**. This threshold is highly sensitive (up to 90%) and is a critical diagnostic criterion in the Leipzig scoring system. **Why Other Options are Incorrect:** * **Option A (200 µg/g):** While values between 75–250 µg/g can be seen in some patients (especially those with advanced cirrhosis or those already on treatment), 250 µg/g is the established diagnostic cutoff for a definitive diagnosis. * **Options C & D (300 & 350 µg/g):** These values are seen in severe cases of Wilson disease, but they are too high to serve as the standard diagnostic baseline. Using these as cutoffs would result in many false negatives. **High-Yield Clinical Pearls for NEET-PG:** * **Kayser-Fleischer (KF) Rings:** Found in the Descemet membrane of the cornea; present in 95% of neurological cases but only 50-60% of hepatic cases [1]. * **Serum Ceruloplasmin:** Usually low (<20 mg/dL), but can be normal as it is an acute-phase reactant [2]. * **Urinary Copper:** 24-hour urinary copper excretion is typically >100 µg/day. * **Treatment:** **Trientine** is now preferred over D-Penicillamine due to fewer side effects. Zinc is used for maintenance therapy.

Practice by Chapter

Esophageal Disorders

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Peptic Ulcer Disease

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Inflammatory Bowel Disease

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Irritable Bowel Syndrome

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Malabsorption Syndromes

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Pancreatitis (Acute and Chronic)

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Gastrointestinal Bleeding

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Liver Diseases and Cirrhosis

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Viral Hepatitis

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Biliary Tract Disorders

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Gastrointestinal Motility Disorders

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Gastrointestinal Malignancies

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