Gastroenterology — MCQs

Gastroenterology Indian Medical PG Practice Questions and MCQs

Question 671: Which statement is NOT true regarding celiac disease?

A. Total and subtotal villous atrophy
B. Increased chance of lymphoma
C. Anti-gliadin antibodies persist even after a gluten-free diet
D. Deficiency of disaccharidases (Correct Answer)

Explanation: ### Explanation Celiac disease (Gluten-sensitive enteropathy) is an immune-mediated inflammatory disorder of the small intestine caused by sensitivity to dietary gluten [1]. **Why Option D is the Correct Answer (The False Statement):** While celiac disease causes mucosal damage, **deficiency of disaccharidases** (like lactase) is a **secondary and reversible** phenomenon [3]. It is not a primary feature of the disease itself. Once a gluten-free diet (GFD) is initiated and the intestinal mucosa heals, disaccharidase levels typically return to normal [3]. Therefore, it is not a defining characteristic of the disease pathology compared to the other options. **Analysis of Other Options:** * **Option A (Villous Atrophy):** This is the hallmark histological finding. The Marsh classification categorizes the spectrum from lymphocytic infiltration to **total/subtotal villous atrophy**, which leads to malabsorption [1]. * **Option B (Lymphoma):** Patients with long-standing or refractory celiac disease have a significantly **increased risk of malignancy**, most notably **Enteropathy-Associated T-cell Lymphoma (EATL)** and small bowel adenocarcinoma [4]. * **Option C (Anti-gliadin antibodies):** While IgA anti-Tissue Transglutaminase (tTG) is the best screening test, **Anti-gliadin antibodies (AGA)** can persist for a long duration. However, in the context of NEET-PG, the clinical focus is that serological markers (especially tTG and EMA) should ideally decline with a GFD; if they persist, it often indicates dietary non-compliance [2]. **Clinical Pearls for NEET-PG:** * **Gold Standard Diagnosis:** Small bowel biopsy (showing villous atrophy, crypt hyperplasia, and increased intraepithelial lymphocytes) [1]. * **Best Screening Test:** IgA anti-Tissue Transglutaminase (tTG) antibody [1]. * **HLA Association:** HLA-DQ2 (95%) and HLA-DQ8 [1]. * **Associated Condition:** Dermatitis herpetiformis (pathognomonic skin manifestation). * **Site of Involvement:** Primarily the **distal duodenum and proximal jejunum** (where gluten concentration is highest).

Question 672: Terlipressin is preferred over vasopressin for esophageal varices because of which reason?

A. Faster onset of action
B. Not metabolized
C. Fewer side effects (Correct Answer)
D. More potent

Explanation: Explanation: **Terlipressin** is a synthetic analogue of vasopressin (specifically 1-triglycyl-8-lysine-vasopressin). It acts as a prodrug that is slowly converted into lysine-vasopressin in the body. **Why Option C is Correct:** The primary reason Terlipressin is preferred over Vasopressin is its **superior safety profile (fewer side effects)**. Vasopressin is a non-selective vasoconstrictor that causes significant systemic side effects, most notably **coronary artery vasoconstriction** (leading to myocardial ischemia) and peripheral ischemia. Terlipressin, however, has a more selective action on the **V1 receptors** in the splanchnic circulation. This results in effective splanchnic vasoconstriction (reducing portal pressure) with significantly fewer systemic and cardiac complications [1]. **Analysis of Incorrect Options:** * **A. Faster onset of action:** Terlipressin is a **prodrug**. It requires enzymatic cleavage of the glycyl residues to become active, meaning its onset is actually slower or more sustained compared to the immediate action of a vasopressin bolus. * **B. Not metabolized:** Terlipressin is extensively metabolized by endopeptidases in the liver and kidneys to release the active metabolite. * **D. More potent:** While Terlipressin is highly effective, the clinical preference is based on the **therapeutic index (safety-to-efficacy ratio)** rather than raw potency. **High-Yield Clinical Pearls for NEET-PG:** * **Drug of Choice:** Terlipressin is the drug of choice for the management of **Acute Variceal Bleeding** and **Hepatorenal Syndrome (HRS)** [1]. * **Mechanism:** It reduces portal venous pressure by causing selective splanchnic vasoconstriction [1]. * **Administration:** Unlike Vasopressin (which requires continuous infusion), Terlipressin can be given as **intermittent IV boluses** due to its longer half-life (approx. 6 hours) [1]. * **Contraindication:** Use with caution in patients with ischemic heart disease or peripheral vascular disease [1].

Question 673: Hepatic encephalopathy is precipitated by all the following conditions except?

A. Paracentesis
B. Benzodiazepines
C. Constipation
D. Hyperkalemia (Correct Answer)

Explanation: Hepatic Encephalopathy (HE) is a reversible neuropsychiatric syndrome caused by liver failure and portosystemic shunting, leading to the accumulation of neurotoxins (primarily ammonia) [1]. **Why Hyperkalemia is the correct answer:** Hyperkalemia does **not** precipitate HE. In fact, it is **Hypokalemia** that is a major trigger. When potassium levels are low, the body attempts to conserve $K^+$ in the renal tubules by exchanging it for $H^+$ ions (intracellular acidosis). This promotes the conversion of ammonium ($NH_4^+$) to ammonia ($NH_3$). Unlike $NH_4^+$, $NH_3$ is non-ionized and can easily cross the blood-brain barrier, worsening encephalopathy. **Why the other options are incorrect:** * **Paracentesis:** Large-volume paracentesis without adequate albumin replacement leads to effective hypovolemia and "Post-paracentesis Circulatory Dysfunction," which impairs renal perfusion and triggers HE. * **Benzodiazepines:** These drugs act on GABA receptors. In cirrhosis, there is already increased GABAergic tone; sedatives further depress the CNS and can mask or worsen the stages of HE. * **Constipation:** This is a classic trigger. Prolonged transit time increases the production and absorption of ammonia by enteric bacteria from nitrogenous waste in the colon [1]. **High-Yield Clinical Pearls for NEET-PG:** * **Most common trigger:** GI Bleed (increases nitrogen load) and Infections (e.g., SBP). * **Metabolic Triggers:** Azotemia, Dehydration, Hypokalemia, and Metabolic Alkalosis. * **Treatment Gold Standard:** **Lactulose** (converts $NH_3$ to $NH_4^+$ via acidification and acts as an osmotic laxative) and **Rifaximin** (reduces ammonia-producing gut flora). * **Asterixis (Flapping tremors):** A hallmark sign, though not pathognomonic for HE (also seen in uremia and $CO_2$ narcosis).

Question 674: What is the most common cause of liver abscess?

A. Proteus
B. Escherichia coli (Correct Answer)
C. Klebsiella
D. Staphylococcus

Explanation: Explanation: Liver abscesses are primarily categorized into pyogenic (bacterial) and amoebic. In the context of **pyogenic liver abscess (PLA)**, which is the most common type in developed countries and a frequent exam topic, the etiology is usually polymicrobial, originating from the biliary tract or portal circulation. **1. Why Escherichia coli is correct:** Historically and globally, **Escherichia coli** remains the most common aerobic organism isolated from pyogenic liver abscesses. It typically reaches the liver via the portal vein (from intestinal sources like appendicitis or diverticulitis) or via ascending cholangitis. While there is a shifting trend in Southeast Asia toward *Klebsiella*, most standard textbooks (like Harrison’s) and NEET-PG references still cite *E. coli* as the leading cause worldwide. **2. Analysis of Incorrect Options:** * **Klebsiella (Option C):** This is the leading cause of "primary" liver abscesses (occurring without underlying biliary disease), especially in patients with diabetes mellitus. It is currently the most common cause in Southeast Asian populations but remains second to *E. coli* in global/traditional statistics. * **Proteus (Option A):** While a Gram-negative enteric organism, it is a rare cause of liver abscess compared to *E. coli* and *Klebsiella*. * **Staphylococcus (Option B):** *Staphylococcus aureus* is usually seen in cases of **hematogenous spread** (seeding from the hepatic artery) or following blunt trauma, but it is not the most common overall. **Clinical Pearls for NEET-PG:** * **Most common route of infection:** Biliary tract disease (e.g., gallstones, strictures) [1]. * **Most common symptom:** Fever (often with chills/rigors) and right upper quadrant pain. * **Amoebic Liver Abscess:** Caused by *Entamoeba histolytica*; characterized by "anchovy sauce" pus and usually presents as a solitary lesion in the right lobe [2]. * **Gold Standard Diagnosis:** Triple-phase CT scan [1].

Question 675: A 57-year-old man is admitted to the hospital for treatment of chronic pancreatitis. In patients with chronic pancreatitis, deficiency of which of the following vitamins is most likely?

A. Folic acid
B. Vitamin B2 (riboflavin)
C. Vitamin B6 (pyridoxine)
D. Vitamin D (Correct Answer)

Explanation: **Explanation:** The correct answer is **Vitamin D (Option D).** **Pathophysiology:** Chronic pancreatitis leads to **exocrine pancreatic insufficiency (EPI)**. The destruction of acinar cells results in a deficiency of pancreatic enzymes, specifically **lipase** [1]. Without lipase, dietary fats are not hydrolyzed into fatty acids and monoglycerides, leading to fat malabsorption and steatorrhea. Since **Vitamins A, D, E, and K** are fat-soluble, they require micelle formation and pancreatic enzymes for absorption. Among these, Vitamin D deficiency is clinically the most significant and frequent in chronic pancreatitis patients, often leading to decreased bone mineral density (osteopenia/osteoporosis). **Analysis of Incorrect Options:** * **A, B, and C (Folic acid, Riboflavin, Pyridoxine):** These are all **water-soluble vitamins**. Unlike fat-soluble vitamins, their absorption is generally independent of pancreatic enzyme activity and micelle formation. While patients with chronic pancreatitis due to alcoholism may have concomitant nutritional deficiencies in these vitamins, they are not a direct physiological consequence of pancreatic exocrine failure itself. **NEET-PG High-Yield Pearls:** * **Most common fat-soluble vitamin deficiency in EPI:** Vitamin D is frequently cited as the most common, though all four (A, D, E, K) are at risk. * **Vitamin B12 Paradox:** Interestingly, Vitamin B12 (water-soluble) can also be deficient in chronic pancreatitis. This is because pancreatic proteases are required to degrade **R-binders** (haptocorrin) to allow B12 to bind to **Intrinsic Factor**. * **Clinical Triad of Chronic Pancreatitis:** Pancreatic calcifications, steatorrhea, and diabetes mellitus [1]. * **Diagnostic Gold Standard:** Fecal elastase-1 test (low levels indicate EPI) [1].

Question 676: In subacute spontaneous peritonitis in cirrhosis patients, what is the typical count of polymorphonuclear cells?

A. More than 200 cells/cumm (Correct Answer)
B. More than 300 cells/cumm
C. More than 400 cells/cumm
D. More than 500 cells/cumm

Explanation: **Explanation:** Spontaneous Bacterial Peritonitis (SBP) is a critical complication of cirrhosis with ascites. The diagnosis is primarily based on the analysis of ascitic fluid obtained via paracentesis [1]. **1. Why Option A is Correct:** The gold standard for diagnosing SBP is an **ascitic fluid polymorphonuclear (PMN) cell count ≥ 250 cells/mm³** (often simplified to >200 cells/mm³ in various clinical contexts and exam patterns). PMNs are calculated by multiplying the total white blood cell (WBC) count by the percentage of neutrophils. [1] Even if the ascitic fluid culture is negative (Culture-Negative Neutrocytic Ascites), a PMN count above this threshold is sufficient to initiate empirical antibiotic therapy (typically 3rd generation cephalosporins like Cefotaxime). **2. Why Other Options are Incorrect:** * **Options B, C, and D:** While PMN counts in SBP can certainly exceed 300, 400, or 500 cells/mm³, these are not the diagnostic thresholds. Using a higher cutoff would decrease the sensitivity of the test, leading to missed diagnoses and increased mortality in cirrhotic patients. The threshold of 250 (or >200) provides the best balance of sensitivity and specificity. **3. High-Yield Clinical Pearls for NEET-PG:** * **Most Common Organism:** *E. coli* (followed by *Klebsiella* and *Streptococcus*). * **SAAG Score:** SBP occurs in the setting of high SAAG (>1.1 g/dL) ascites, indicating portal hypertension. [1] * **Secondary Peritonitis vs. SBP:** If ascitic fluid shows multiple organisms on Gram stain, very high protein (>1 g/dL), or low glucose (<50 mg/dL), suspect **Secondary Peritonitis** (e.g., gut perforation) rather than SBP. * **Albumin Therapy:** Giving IV albumin (1.5g/kg on day 1 and 1g/kg on day 3) reduces the risk of Hepatorenal Syndrome (HRS) and mortality in SBP patients. [2]

Question 677: Celiac sprue causes malabsorption syndrome due to?

A. Coliform infection of small bowel
B. Lactase deficiency
C. Hypersensitivity to dietary gluten (Correct Answer)
D. Ischaemia of celiac artery

Explanation: **Explanation:** **Celiac Disease (Gluten-Sensitive Enteropathy)** is an immune-mediated inflammatory disorder of the small intestine [1]. The correct answer is **Option C** because the disease is triggered by an inappropriate T-cell mediated **hypersensitivity reaction to gluten** (specifically the gliadin fraction) found in wheat, barley, and rye. In genetically predisposed individuals (HLA-DQ2/DQ8), ingestion of gluten leads to villous atrophy, crypt hyperplasia, and malabsorption [1]. **Analysis of Incorrect Options:** * **Option A:** Coliform infection is associated with **Tropical Sprue**, which occurs in specific geographical areas and responds to antibiotics, unlike Celiac disease. * **Option B:** While **Lactase deficiency** can occur secondary to Celiac disease (due to brush border damage), it is a consequence of the disease, not the primary cause of the malabsorption syndrome itself [2]. * **Option C:** **Ischaemia of the celiac artery** causes Chronic Mesenteric Ischemia (Abdominal Angina), characterized by postprandial pain and weight loss, but it does not involve the immunological mechanism of sprue. **High-Yield Clinical Pearls for NEET-PG:** * **Genetics:** Strongly associated with **HLA-DQ2** (95%) and **HLA-DQ8** [1]. * **Serology:** **Anti-tissue Transglutaminase (anti-tTG) IgA** is the screening drug of choice. **Anti-Endomysial antibody (EMA)** is the most specific. * **Gold Standard Diagnosis:** D2 (distal duodenal) biopsy showing **Villous atrophy**, Crypt hyperplasia, and increased Intraepithelial Lymphocytes (Marsh Criteria) [1]. * **Dermatological Association:** **Dermatitis Herpetiformis** (itchy vesicles on extensors). * **Complications:** Increased risk of **Enteropathy-associated T-cell lymphoma (EATL)** and Small bowel adenocarcinoma. * **Management:** Life-long exclusion of wheat, rye, and barley from the diet [1].

Question 678: All of the following diseases are associated with peptic ulcer disease, EXCEPT:

A. COPD
B. Coronary artery disease (Correct Answer)
C. Chronic renal failure
D. Nephrolithiasis

Explanation: The association between Peptic Ulcer Disease (PUD) and various systemic conditions is a high-yield topic for NEET-PG [1]. While the primary causes of PUD are *H. pylori* infection and NSAID use, several chronic comorbidities increase the risk of ulcer formation [2]. **Why Coronary Artery Disease (CAD) is the correct answer:** There is no direct pathophysiological link between CAD and the development of peptic ulcers. While patients with CAD often take aspirin or antiplatelet agents (which *do* cause ulcers), the underlying atherosclerotic disease itself is not a risk factor for PUD. Therefore, CAD is the "exception" in this list. **Analysis of other options:** * **COPD:** There is a well-established association between chronic pulmonary disease and PUD. Proposed mechanisms include systemic inflammation, hypercapnia increasing gastric acid secretion, and the use of medications like glucocorticoids or theophylline. * **Chronic Renal Failure (CRF):** Patients with CRF have a higher prevalence of PUD due to hypergastrinemia (reduced renal clearance of gastrin) and the uremic state, which impairs mucosal defense mechanisms. * **Nephrolithiasis:** This is associated with PUD primarily in the context of **Multiple Endocrine Neoplasia Type 1 (MEN-1)**. In MEN-1, hyperparathyroidism causes kidney stones, while Gastrinomas (Zollinger-Ellison Syndrome) cause severe peptic ulceration. **High-Yield Clinical Pearls for NEET-PG:** * **Other associated conditions:** Cirrhosis, systemic mastocytosis (histamine release), and alpha-1 antitrypsin deficiency. * **Zollinger-Ellison Syndrome:** Suspect this in patients with multiple, refractory, or post-bulbar ulcers. * **Cushing’s Ulcer:** Associated with increased intracranial pressure (vagal stimulation → hyperacidity) [2]. * **Curling’s Ulcer:** Associated with severe burns [2].

Question 679: Intestinal hypomotility is seen in all of the following except?

A. Diabetes
B. Parkinsonism
C. Amyloidosis
D. All of the above (Correct Answer)

Explanation: **Explanation:** Intestinal hypomotility (reduced gut transit) is a common manifestation of systemic diseases that affect the **Enteric Nervous System (ENS)**, the autonomic nervous system, or the smooth muscles of the gastrointestinal tract [2]. **1. Diabetes Mellitus:** This is the most common cause of chronic intestinal dysmotility. Prolonged hyperglycemia leads to **autonomic neuropathy** [1]. Damage to the vagus nerve and the inhibitory nitrergic neurons in the gut results in delayed gastric emptying (gastroparesis) and intestinal pseudo-obstruction [1]. **2. Parkinsonism:** This neurodegenerative disorder affects the gut via two mechanisms: the loss of dopaminergic neurons in the ENS and the accumulation of **Lewy bodies** in the myenteric plexus [1]. Additionally, medications used for Parkinson’s (like anticholinergics) further exacerbate hypomotility, leading to severe constipation. **3. Amyloidosis:** In systemic amyloidosis, the deposition of insoluble amyloid fibrils occurs in the muscularis propria and the extrinsic autonomic nerves. This infiltration leads to **myopathic and neuropathic** dysfunction, causing significant intestinal hypomotility and pseudo-obstruction. **Conclusion:** Since all three conditions (Diabetes, Parkinsonism, and Amyloidosis) are classic causes of reduced gastrointestinal transit, the correct answer is **All of the above.** **NEET-PG High-Yield Pearls:** * **Scleroderma** is another high-yield cause of hypomotility due to smooth muscle atrophy and fibrosis [1]. * **Hypothyroidism** and **Hypercalcemia** are metabolic causes of intestinal hypomotility [1]. * **Ogilvie’s Syndrome** refers to acute colonic pseudo-obstruction (massive dilation of the colon) often seen in elderly or post-operative patients.

Question 680: Which of the following findings is more characteristic of ulcerative colitis when compared to Crohn's disease?

A. Segmental involvement
B. Granulomas
C. Lymph node involvement
D. Rectal bleeding (Correct Answer)

Explanation: **Explanation:** The correct answer is **Rectal bleeding**. This is a hallmark clinical feature of **Ulcerative Colitis (UC)** because the disease process involves continuous, superficial inflammation of the colonic mucosa, almost always starting in the rectum and extending proximally [1]. Because the rectal mucosa is consistently inflamed and friable, hematochezia (bloody stools) is present in over 90% of UC patients. In contrast, **Crohn’s Disease (CD)** often spares the rectum and involves transmural inflammation; while bleeding can occur, it is significantly less common than in UC [3]. **Analysis of Incorrect Options:** * **A. Segmental involvement:** This is characteristic of **Crohn’s Disease**, where "skip lesions" (areas of disease separated by normal mucosa) occur [2]. UC is characterized by continuous, symmetrical involvement [1]. * **B. Granulomas:** Non-caseating granulomas are a pathognomonic histological finding in **Crohn’s Disease** (seen in ~30% of cases). They are absent in UC. * **C. Lymph node involvement:** While both can have lymphadenopathy, prominent mesenteric lymph node involvement and "creeping fat" are classic surgical/pathological findings associated with the transmural nature of **Crohn’s Disease**. **High-Yield NEET-PG Pearls:** * **Smoking Paradox:** Smoking is a risk factor for Crohn’s Disease but appears to be **protective** against Ulcerative Colitis. * **Depth of Inflammation:** UC is limited to the **mucosa and submucosa** [1], whereas CD is **transmural** (leading to fistulas and strictures) [4]. * **Lead Pipe Sign:** Seen on barium enema in chronic UC due to loss of haustrations. * **ASCA vs. p-ANCA:** CD is associated with **ASCA** (+), while UC is associated with **p-ANCA** (+).

Practice by Chapter

Esophageal Disorders

Practice Questions

Peptic Ulcer Disease

Practice Questions

Inflammatory Bowel Disease

Practice Questions

Irritable Bowel Syndrome

Practice Questions

Malabsorption Syndromes

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Pancreatitis (Acute and Chronic)

Practice Questions

Gastrointestinal Bleeding

Practice Questions

Liver Diseases and Cirrhosis

Practice Questions

Viral Hepatitis

Practice Questions

Biliary Tract Disorders

Practice Questions

Gastrointestinal Motility Disorders

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Gastrointestinal Malignancies

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