Gastroenterology Practice Questions

Q: Which of the following conditions is NOT caused by H. pylori?

Carcinoid tumor. **Explanation:** The correct answer is **C. Carcinoid tumor**. *Helicobacter pylori* is a gram-negative, microaerophilic bacterium that colonizes the gastric mucosa, leading to chronic inflammation [2]. While it is a major risk factor for epithelial and lymphoid malignancies, it is not associated with the development of **Carcinoid tumors** (Neuroendocrine tumors). Carcinoid tumors of the stomach are typically associated with hypergastrinemia (as seen in Type 1 Gastric Carcinoid due to autoimmune atrophic gastritis) or MEN-1 syndrome [2]. **Why the other options are incorrect:** * **Peptic Ulcer (A):** *H. pylori* is the most common cause of peptic ulcer disease (PUD). It causes antral-predominant gastritis leading to increased acid secretion (duodenal ulcers) or pangastritis leading to mucosal atrophy (gastric ulcers) [1]. * **MALToma (B):** *H. pylori* provides the chronic antigenic stimulation required for the development of Mucosa-Associated Lymphoid Tissue (MALT) lymphoma [3]. Notably, early-stage MALToma can often be cured by *H. pylori* eradication alone [3]. * **Gastric Carcinoma (D):** *H. pylori* is classified as a **Class I Carcinogen** by the WHO. Chronic infection leads to a progression from chronic gastritis to intestinal metaplasia, dysplasia, and finally, adenocarcinoma (Lauren’s intestinal type). **High-Yield Clinical Pearls for NEET-PG:** * **Most common site of colonization:** Gastric antrum [1]. * **Virulence factors:** **CagA** (associated with high risk of cancer) and **VacA** (vacuolating cytotoxin) [1]. * **Non-invasive Gold Standard for diagnosis:** Urea Breath Test (UBT) – used to confirm eradication. * **Invasive Gold Standard:** Endoscopic biopsy followed by Rapid Urease Test (RUT) or Histopathology (Warthin-Starry stain). * **Treatment:** Standard Triple Therapy (PPI + Amoxicillin + Clarithromycin) or Bismuth-based Quadruple Therapy.

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

Hyperkalemia. 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).

Q: 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?

Vitamin D. **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].

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

More than 200 cells/cumm. **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]

Q: Celiac sprue causes malabsorption syndrome due to?

Hypersensitivity to dietary gluten. **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].

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

Coronary artery disease. 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].

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

All of the above. **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 1

Which of the following conditions is NOT caused by H. pylori?

Accepted Answer

Carcinoid tumor

Answer

Peptic ulcer

Answer

MALToma

Answer

Gastric carcinoma

Question 2

Which statement is NOT true regarding celiac disease?

Accepted Answer

Deficiency of disaccharidases

Answer

Total and subtotal villous atrophy

Answer

Increased chance of lymphoma

Answer

Anti-gliadin antibodies persist even after a gluten-free diet

Question 3

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

Accepted Answer

Fewer side effects

Answer

Faster onset of action

Answer

Not metabolized

Answer

More potent

Question 4

Hepatic encephalopathy is precipitated by all the following conditions except?

Accepted Answer

Hyperkalemia

Answer

Paracentesis

Answer

Benzodiazepines

Answer

Constipation

Question 5

What is the most common cause of liver abscess?

Accepted Answer

Escherichia coli

Answer

Proteus

Answer

Klebsiella

Answer

Staphylococcus

Question 6

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?

Accepted Answer

Vitamin D

Answer

Folic acid

Answer

Vitamin B2 (riboflavin)

Answer

Vitamin B6 (pyridoxine)

Question 7

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

Accepted Answer

More than 200 cells/cumm

Answer

More than 300 cells/cumm

Answer

More than 400 cells/cumm

Answer

More than 500 cells/cumm

Question 8

Celiac sprue causes malabsorption syndrome due to?

Accepted Answer

Hypersensitivity to dietary gluten

Answer

Coliform infection of small bowel

Answer

Lactase deficiency

Answer

Ischaemia of celiac artery

Question 9

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

Accepted Answer

Coronary artery disease

Answer

COPD

Answer

Chronic renal failure

Answer

Nephrolithiasis

Question 10

Intestinal hypomotility is seen in all of the following except?

Accepted Answer

All of the above

Answer

Diabetes

Answer

Parkinsonism

Answer

Amyloidosis

Gastroenterology — MCQs

Gastroenterology — MCQs

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