Gastroenterology — MCQs

Gastroenterology Indian Medical PG Practice Questions and MCQs

Question 871: Which of the following findings does not occur in a patient with gastrinoma?

A. Epigastric pain
B. Diarrhoea
C. Basal acid output (BAO) less than 15 mEq/litre (Correct Answer)
D. Serum gastrin levels >200 pg/ml

Explanation: A gastrinoma is a gastrin-secreting neuroendocrine tumor, most commonly located in the "gastrinoma triangle," leading to **Zollinger-Ellison Syndrome (ZES)**. The hallmark of this condition is extreme gastric acid hypersecretion. **1. Why Option C is correct:** In ZES, the ectopic secretion of gastrin by the tumor causes massive stimulation of parietal cells. This results in a significantly elevated **Basal Acid Output (BAO)**. A BAO **greater than 15 mEq/hour** (in patients with an intact stomach) is a diagnostic criterion for gastrinoma. Therefore, a BAO *less than* 15 mEq/hour is inconsistent with the diagnosis. **2. Why the other options are incorrect:** * **Option A (Epigastric pain):** This is the most common symptom (occurring in >90% of patients) due to severe, often refractory, peptic ulcer disease (PUD). Patients with gastroenteropancreatic NETs often have a history of abdominal pain over many years [1]. * **Option B (Diarrhea):** Occurs in about 30-50% of patients. It is caused by the high volume of acid denaturing pancreatic enzymes (leading to malabsorption/steatorrhea) and direct mucosal injury to the small intestine. Pancreatic NETs can also cause hormone excess [1]. * **Option D (Serum gastrin >200 pg/ml):** Hypergastrinemia is the biochemical hallmark. While the diagnostic threshold for ZES is often >1000 pg/ml, any value significantly above the normal range (typically >100-200 pg/ml) is expected. **High-Yield Clinical Pearls for NEET-PG:** * **Secretin Stimulation Test:** The most sensitive and specific provocative test. A rise in serum gastrin **>200 pg/ml** after IV secretin is diagnostic. * **MEN-1 Association:** Approximately 25% of gastrinomas are associated with Multiple Endocrine Neoplasia Type 1 (3Ps: Parathyroid, Pancreas, Pituitary). * **Location:** Most ulcers in ZES are in the first part of the duodenum, but ulcers in the **distal duodenum or jejunum** are highly suggestive of gastrinoma. * **BAO/MAO Ratio:** Often >0.6 in ZES.

Question 872: What is the most common cause of gastrointestinal bleeding?

A. Duodenal ulcer (Correct Answer)
B. Gastric cancer
C. Esophageal varices
D. Erosive gastritis

Explanation: **Explanation:** **1. Why Duodenal Ulcer is Correct:** Peptic Ulcer Disease (PUD) is the most common cause of upper gastrointestinal bleeding (UGIB) worldwide, accounting for approximately 50% of cases [1]. Within PUD, **Duodenal Ulcers (DU)** are significantly more common than gastric ulcers [2]. Bleeding typically occurs when the ulcer erodes into a vessel, most commonly the **gastroduodenal artery** (located behind the first part of the duodenum) [1]. **2. Analysis of Incorrect Options:** * **Gastric Cancer:** While a significant cause of chronic occult blood loss and anemia, it is a relatively uncommon cause of acute, massive GI bleeding compared to PUD. * **Esophageal Varices:** This is the most common cause of *massive* or *life-threatening* UGIB in patients with portal hypertension (cirrhosis), but it is not the most common cause in the general population [1]. * **Erosive Gastritis:** Often caused by NSAIDs or alcohol, this is a frequent cause of UGIB but ranks behind PUD in overall prevalence [1]. **3. NEET-PG High-Yield Pearls:** * **Most common cause of UGIB:** Duodenal Ulcer. * **Most common cause of Lower GI Bleeding:** Diverticulosis (in adults) and Meckel’s Diverticulum (in children). * **Rockall Score & Glasgow-Blatchford Score:** These are high-yield clinical scoring systems used to risk-stratify patients with UGIB [1]. * **Dieulafoy’s Lesion:** A rare but classic "exam favorite" cause of UGIB involving a large submucosal artery that bleeds through a tiny mucosal defect, usually in the lesser curvature of the stomach.

Question 873: Which of the following conditions is NOT typically associated with the formation of a small intestinal stricture?

A. Lymphoma
B. Typhoid fever (Correct Answer)
C. Malignant tumor
D. Tuberculosis

Explanation: The formation of a small intestinal stricture depends on the nature of the inflammatory or neoplastic process. **Typhoid fever (Enteric fever)**, caused by *Salmonella typhi*, primarily affects the Peyer’s patches in the terminal ileum. The characteristic pathology involves longitudinal ulceration. Because these ulcers are longitudinal (parallel to the long axis of the gut) and heal without significant fibrosis or circumferential scarring, they **do not result in stricture formation**. Instead, the most feared complications of typhoid ulcers are perforation and hemorrhage. **Analysis of other options:** * **Tuberculosis (TB):** Intestinal TB is the most common cause of benign small bowel strictures in developing countries. The ulcers are typically **transverse** (circumferential), leading to significant fibrosis and "napkin-ring" narrowing during healing. * **Malignant Tumors (e.g., Adenocarcinoma):** These lesions grow circumferentially and infiltrate the bowel wall, leading to progressive luminal narrowing and "apple-core" appearances. * **Lymphoma:** While primary intestinal lymphoma often causes aneurysmal dilatation of the bowel wall, it can also present with obstructive symptoms due to bulky masses or associated desmoplastic reactions that lead to strictures [1]. **High-Yield Clinical Pearls for NEET-PG:** * **Typhoid Ulcers:** Longitudinal, along the long axis; lead to **perforation**, not strictures. * **Tubercular Ulcers:** Transverse/Circumferential; lead to **strictures**, not usually perforation. * **Crohn’s Disease:** Characterized by transmural inflammation and "string sign of Kantor" due to terminal ileal strictures. * **Aneurysmal Dilatation:** Classically associated with **Small Bowel Lymphoma** due to destruction of the myenteric plexus.

Question 874: Which of the following is NOT typically seen in cirrhosis of the liver?

A. Enlargement of the testis (Correct Answer)
B. Gynaecomastia
C. Absence of pubic and facial hair
D. Loss of libido

Explanation: In cirrhosis of the liver, the primary hormonal derangement is **hyperestrogenism** (excess estrogen) and **hypogonadism** (decreased testosterone). This occurs because the damaged liver cannot effectively clear androstenedione, which is then peripherally converted into estrogen by aromatase. **Why "Enlargement of the testis" is the correct answer:** Hyperestrogenism exerts negative feedback on the hypothalamus and pituitary gland, leading to decreased secretion of FSH and LH [1]. This results in **testicular atrophy** (shrinkage), not enlargement [1]. Therefore, enlargement of the testis is not a feature of cirrhosis. **Why the other options are incorrect:** * **Gynaecomastia:** Increased estrogen levels stimulate breast tissue proliferation in males, a classic sign of chronic liver disease [1], [2]. * **Absence of pubic and facial hair:** High estrogen levels and low testosterone lead to a "feminizing" effect, resulting in the loss of secondary male sexual characteristics, including thinning or loss of axillary, pubic, and facial hair [1]. * **Loss of libido:** This is a direct consequence of low serum testosterone levels (hypogonadism) associated with liver failure [1]. **High-Yield Clinical Pearls for NEET-PG:** * **Spider Angiomata & Palmar Erythema:** These are also caused by hyperestrogenism due to its vasodilatory effects [1]. * **Feminization in Cirrhosis:** The combination of gynaecomastia, testicular atrophy, and loss of male hair distribution is collectively termed "feminization" [1]. * **Spironolactone:** This diuretic, often used to treat ascites in cirrhosis, can further worsen gynaecomastia due to its anti-androgenic properties.

Question 875: Pseudochylous ascites is most commonly associated with which of the following conditions?

A. Cirrhosis
B. Hyperlipidemia
C. Filariasis
D. Malignant ascites (Correct Answer)

Explanation: Explanation: Pseudochylous ascites is defined by a milky appearance of the ascitic fluid that mimics chyle but lacks a high triglyceride content. The milky turbidity is instead caused by cellular degeneration and the presence of lecithin-globulin complexes (phospholipids) derived from the breakdown of tumor cells or inflammatory cells. 1. Why Malignant Ascites is Correct: Malignancy is the most common cause of pseudochylous ascites. In advanced cancers, rapid cell turnover and necrosis lead to the release of intracellular lipids and proteins into the peritoneal cavity [1]. Unlike true chylous ascites (caused by lymphatic obstruction), pseudochylous ascites has low triglyceride levels (usually <200 mg/dL) and does not clear upon adding ether. 2. Analysis of Incorrect Options: * Cirrhosis: Typically presents with transudative, clear, or straw-colored fluid. While cirrhosis can occasionally cause chylous ascites (due to high lymph flow), it is not the primary cause of pseudochylous fluid. * Hyperlipidemia: While systemic hyperlipidemia can affect serum appearance, it does not directly cause the accumulation of milky ascitic fluid unless there is a secondary mechanism of leakage or exudation. * Filariasis: This is a classic cause of True Chylous Ascites. It occurs due to the physical obstruction of lymphatic vessels by parasites, leading to the leakage of triglyceride-rich chyle into the peritoneum. 3. NEET-PG High-Yield Pearls: * True Chylous Ascites: High Triglycerides (>200 mg/dL), presence of chylomicrons, clears with ether. Most common causes: Lymphoma (adults) and congenital lymphatic malformations (children). * Pseudochylous Ascites: Low Triglycerides, high cholesterol/phospholipids, does not clear with ether. Most common cause: Malignancy or chronic inflammation (e.g., Tuberculosis). * Chyliform Ascites: A rare term sometimes used for fluid with high lecithin-globulin complexes, often used interchangeably with pseudochylous.

Question 876: Chronic calcific pancreatitis is associated with all of the following except?

A. Hypercalcemia (Correct Answer)
B. Diabetes mellitus
C. Malabsorption of fat
D. Diabetes associated complications are uncommon

Explanation: **Explanation:** The correct answer is **A. Hypercalcemia**. **1. Why Hypercalcemia is the correct answer:** Hypercalcemia is a **cause** of chronic pancreatitis, not a consequence of it. Elevated serum calcium levels (often due to primary hyperparathyroidism) lead to the activation of trypsinogen to trypsin within the pancreatic parenchyma and the formation of calcium-rich stones in the ducts. Conversely, chronic pancreatitis itself does not cause hypercalcemia; in fact, severe acute episodes or advanced malabsorption can sometimes lead to *hypocalcemia* due to vitamin D deficiency and soap formation (saponification). **2. Analysis of incorrect options:** * **B. Diabetes Mellitus:** This is a classic feature of chronic pancreatitis. Progressive destruction of islet cells (endocrine pancreas) leads to "Type 3c Diabetes." * **C. Malabsorption of fat:** Chronic pancreatitis leads to exocrine insufficiency. Since lipase production is significantly reduced, fat is not digested, leading to steatorrhea and fat-soluble vitamin deficiency. * **D. Diabetes-associated complications are uncommon:** This is a high-yield clinical fact. While patients develop diabetes, complications like **diabetic ketoacidosis (DKA), retinopathy, and nephropathy are relatively rare** compared to Type 1 or Type 2 DM. This is because there is a concurrent loss of alpha cells (glucagon deficiency), which protects against DKA, and the shortened lifespan of these patients often precludes long-term microvascular damage. [1] **Clinical Pearls for NEET-PG:** * **Triad of Chronic Pancreatitis:** Pancreatic calcification (most specific), Steatorrhea, and Diabetes Mellitus. [1] * **Most common cause:** Alcohol (Worldwide); Malnutrition/Tropical (in parts of India) [1]. * **Investigation of Choice:** MRCP is the most sensitive non-invasive test; CT scan is excellent for visualizing calcifications [2]. * **Early sign:** Fecal Elastase-1 level reduction (indicates exocrine insufficiency) [2].

Question 877: Ulcerative colitis typically starts in which part of the colon?

A. Descending colon
B. Transverse colon
C. Caecum
D. Rectum (Correct Answer)

Explanation: **Explanation:** **Ulcerative Colitis (UC)** is a chronic inflammatory bowel disease characterized by diffuse, mucosal inflammation. The hallmark of UC is that it **always involves the rectum** (proctitis) and extends proximally in a **continuous, symmetrical fashion** without skip lesions [1]. Therefore, the rectum is the starting point in the vast majority of cases. **Analysis of Options:** * **D. Rectum (Correct):** In 95% of cases, the disease originates here [1]. It may remain localized to the rectum or spread to involve the entire colon (pancolitis). * **A & B. Descending/Transverse Colon:** While these areas are frequently involved, they are affected as a result of proximal progression from the rectum. They are not the typical site of origin. * **C. Caecum:** Involvement of the caecum usually occurs only in extensive disease. **High-Yield Clinical Pearls for NEET-PG:** * **Continuous Involvement:** Unlike Crohn’s disease (which has "skip lesions"), UC is continuous [1]. * **Depth of Inflammation:** UC is limited to the **mucosa and submucosa**, whereas Crohn’s is transmural [1]. * **Lead Pipe Appearance:** Chronic UC leads to loss of haustrations, seen on barium enema. * **Backwash Ileitis:** In cases of pancolitis, the terminal ileum may show superficial inflammation. * **Smoking Paradox:** Smoking is actually protective in UC. * **Surgery:** Proctocolectomy is curative for UC [2].

Question 878: A young patient presents with jaundice. Total bilirubin is 21 mg/dL, direct bilirubin is 9.6 mg/dL, and alkaline phosphatase is 84 King-Armstrong units. What is the most likely diagnosis?

A. Hemolytic jaundice
B. Viral hepatitis
C. Chronic active hepatitis
D. Obstructive jaundice (Correct Answer)

Explanation: ### Explanation The clinical presentation and laboratory findings point towards **Obstructive (Post-hepatic) Jaundice**. **1. Why Obstructive Jaundice is Correct:** * **Conjugated Hyperbilirubinemia:** The total bilirubin is 21 mg/dL, and the direct (conjugated) bilirubin is 9.6 mg/dL. In obstructive jaundice, direct bilirubin typically accounts for more than 50% of the total bilirubin due to the back-leakage of conjugated bile into the bloodstream [2]. * **Markedly Elevated Alkaline Phosphatase (ALP):** The ALP is 84 King-Armstrong (KA) units. The normal range for ALP is 3–13 KA units. An elevation of more than 3–4 times the upper limit of normal is a classic hallmark of cholestasis or biliary obstruction [1]. **2. Why the Other Options are Incorrect:** * **A. Hemolytic Jaundice:** Characterized by **unconjugated (indirect) hyperbilirubinemia**. Total bilirubin rarely exceeds 5 mg/dL, and ALP levels remain normal [2]. * **B & C. Viral/Chronic Active Hepatitis:** These are hepatocellular causes of jaundice [1]. While they can cause conjugated hyperbilirubinemia, the primary laboratory feature is a massive rise in transaminases (AST/ALT) [1]. ALP may be elevated but usually less than 2–3 times the normal limit. **3. NEET-PG High-Yield Pearls:** * **Bilirubin Levels:** In surgical/obstructive jaundice (e.g., carcinoma head of pancreas), bilirubin can reach very high levels (up to 20–30 mg/dL), whereas in hemolysis, it stays low. * **Enzyme Ratios:** A high **ALP-to-ALT ratio** suggests obstruction, while a high **ALT-to-ALP ratio** suggests hepatocellular damage [1]. * **Courvoisier’s Law:** In a patient with obstructive jaundice, if the gallbladder is palpable, the obstruction is likely due to a malignancy (e.g., periampullary carcinoma) rather than gallstones.

Question 879: Which drug is used for achalasia cardia?

A. Nifedipine (Correct Answer)
B. Propranolol
C. Atenolol
D. Bethnecol

Explanation: Achalasia Cardia is a primary esophageal motility disorder characterized by the failure of the Lower Esophageal Sphincter (LES) to relax and the absence of esophageal peristalsis [1]. The primary goal of pharmacological therapy is to reduce the resting LES pressure to facilitate the passage of food. Why Nifedipine is correct: Nifedipine is a Calcium Channel Blocker (CCB). Calcium is essential for smooth muscle contraction; by blocking calcium influx into the smooth muscle cells of the LES, Nifedipine promotes smooth muscle relaxation [3]. It is typically administered sublingually 15–30 minutes before meals. While definitive treatments include pneumatic dilation or Myotomy (Heller’s), CCBs are used as temporizing measures or in patients who are poor surgical candidates [4]. Why other options are incorrect: * Propranolol & Atenolol: These are Beta-blockers. They primarily affect heart rate and blood pressure [3]. They have no significant effect on relaxing the smooth muscles of the esophagus and are not indicated for motility disorders. * Bethanechol: This is a cholinergic agonist (parasympathomimetic). It actually increases the tone of the LES and stimulates GI motility, which would worsen the symptoms of achalasia. Clinical Pearls for NEET-PG: * Drug of Choice (Medical): Nitrates (e.g., Isosorbide dinitrate) and CCBs (Nifedipine) are the most common oral agents [2]. * Gold Standard Diagnosis: Esophageal Manometry (shows incomplete LES relaxation and aperistalsis). * Barium Swallow Finding: "Bird’s Beak" appearance [1]. * Botulinum Toxin: Can be injected endoscopically into the LES to inhibit acetylcholine release, causing relaxation (used in elderly/high-risk patients) [4].

Question 880: A patient who has undergone partial gastrectomy presents with neurological symptoms. What is the most probable diagnosis?

A. Folic acid deficiency
B. Thiamine deficiency
C. Vitamin B12 deficiency (Correct Answer)
D. Iron deficiency

Explanation: ### Explanation **Correct Option: C. Vitamin B12 deficiency** **Mechanism:** Vitamin B12 (cobalamin) absorption is a complex process requiring **Intrinsic Factor (IF)**, which is secreted by the **parietal cells** located in the fundus and body of the stomach. In a partial gastrectomy, the reduction in gastric mucosal surface area leads to a significant decrease in IF production. Furthermore, the loss of gastric acidity (hypochlorhydria) prevents the cleavage of B12 from dietary proteins. Without IF, B12 cannot be absorbed in the terminal ileum, leading to deficiency. The liver stores enough vitamin B₁₂ for 3 years, meaning deficiency takes years to become manifest [1]. Neurologically, this manifests as **Subacute Combined Degeneration of the Spinal Cord (SCD)**, characterized by the loss of vibration/position sense (posterior columns) and spasticity (lateral corticospinal tracts). **Analysis of Incorrect Options:** * **A. Folic acid deficiency:** While it causes megaloblastic anemia, it **does not** cause neurological symptoms. It is primarily absorbed in the jejunum and is less affected by gastric resection. * **B. Thiamine (B1) deficiency:** While it causes neurological issues (Wernicke-Korsakoff syndrome), it is typically associated with chronic alcoholism or persistent vomiting [2], not specifically with the loss of intrinsic factor post-gastrectomy. * **D. Iron deficiency:** This is the **most common** nutritional deficiency after gastrectomy (due to loss of gastric acid which converts ferric iron to the absorbable ferrous form), but it presents with microcytic anemia and pica, not neurological deficits. **NEET-PG High-Yield Pearls:** * **Site of IF secretion:** Parietal cells (Stomach). * **Site of B12 absorption:** Terminal Ileum (requires Calcium). * **Earliest neurological sign:** Loss of vibration and position sense. * **Schilling Test:** Historically used to differentiate causes of B12 malabsorption. * **Post-gastrectomy monitoring:** Patients require lifelong prophylactic Vitamin B12 injections (parenteral) because oral supplementation is often ineffective due to the lack of IF.

Practice by Chapter

Esophageal Disorders

Practice Questions

Peptic Ulcer Disease

Practice Questions

Inflammatory Bowel Disease

Practice Questions

Irritable Bowel Syndrome

Practice Questions

Malabsorption Syndromes

Practice Questions

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

Practice Questions

Gastrointestinal Malignancies

Practice Questions

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