Gastroenterology — MCQs

Gastroenterology Indian Medical PG Practice Questions and MCQs

Question 531: Antiendomysial antibody is used in the screening of which condition?

A. Myasthenia gravis
B. Autoimmune hepatitis
C. Coeliac disease (Correct Answer)
D. Graves disease

Explanation: **Explanation:** **Coeliac Disease (Correct Answer):** Anti-endomysial antibody (EMA) is a highly specific serological marker for Coeliac disease [1]. It is an IgA-class antibody directed against **tissue transglutaminase (tTG)** located in the endomysium (the connective tissue sheath surrounding muscle fibers) [1]. * **Gold Standard Screening:** While **IgA anti-tTG** is the preferred initial screening test due to its high sensitivity and lower cost, **IgA Anti-endomysial antibody** has a specificity approaching 100%, making it excellent for confirming a positive screening result before proceeding to a small bowel biopsy. **Incorrect Options:** * **Myasthenia Gravis:** Characterized by antibodies against **acetylcholine receptors (AChR)** or muscle-specific kinase (MuSK) at the neuromuscular junction. * **Autoimmune Hepatitis:** Associated with **Anti-nuclear antibodies (ANA)** and **Anti-smooth muscle antibodies (ASMA)** in Type 1, and **Anti-liver kidney microsomal-1 (LKM-1)** antibodies in Type 2 [2]. * **Graves Disease:** Caused by **Thyroid-stimulating immunoglobulin (TSI)** which acts as an agonist to the TSH receptor. **High-Yield Clinical Pearls for NEET-PG:** 1. **Total IgA levels** must be checked alongside Coeliac serology. If a patient is IgA deficient (common in Coeliac), IgA-based tests (EMA/tTG) will be falsely negative; in such cases, **IgG-based tests** (IgG-tTG or IgG-DGP) should be used. 2. **HLA Association:** Coeliac disease is strongly associated with **HLA-DQ2** (95%) and **HLA-DQ8** [1]. 3. **Biopsy Finding:** The characteristic histological feature is **villous atrophy**, crypt hyperplasia, and increased intraepithelial lymphocytes (Marsh Classification) [1]. 4. **Dermatitis Herpetiformis:** The pathognomonic skin manifestation of Coeliac disease, showing granular IgA deposits on skin biopsy.

Question 532: What is the most common cause of upper gastrointestinal tract bleeding?

A. Esophageal varices
B. Peptic ulcer (Correct Answer)
C. Gastritis
D. Mallory-Weiss tear

Explanation: **Explanation:** **Peptic Ulcer Disease (PUD)** is the most common cause of upper gastrointestinal bleeding (UGIB) worldwide, accounting for approximately 40–50% of all cases [1]. This includes both gastric and duodenal ulcers. The underlying mechanism involves the erosion of the gastrointestinal mucosa by acid and pepsin, often secondary to *H. pylori* infection or the use of Non-Steroidal Anti-Inflammatory Drugs (NSAIDs), leading to the involvement of underlying submucosal vessels [1]. **Analysis of Incorrect Options:** * **Esophageal Varices:** While variceal bleeding is a significant cause of UGIB, especially in patients with chronic liver disease and portal hypertension, it is less common than PUD [1]. However, it is often more severe and carries a higher mortality rate. * **Gastritis:** Erosive gastritis and gastropathy (often due to alcohol or NSAIDs) are common causes of minor bleeding but occur less frequently than discrete peptic ulcers as a source of major UGIB [1]. * **Mallory-Weiss Tear:** This refers to longitudinal mucosal lacerations at the gastroesophageal junction, typically following forceful vomiting or retching. It accounts for only about 5–10% of UGIB cases. **High-Yield Clinical Pearls for NEET-PG:** * **Most common cause of UGIB:** Peptic Ulcer Disease [1]. * **Most common site of PUD bleeding:** The posterior wall of the duodenal bulb (involving the **Gastroduodenal artery**). * **Rockall Score & Glasgow-Blatchford Score:** These are the clinical scoring systems used to risk-stratify patients with UGIB [1]. * **Management:** Intravenous Proton Pump Inhibitors (PPIs) and early endoscopy (within 24 hours) are the cornerstones of management.

Question 533: A 52-year-old alcoholic male develops chronic severe upper abdominal pain and maldigestion. Ultrasound studies demonstrate pancreatic calcifications. Which of the following disorders will this patient most likely develop?

A. Diabetes mellitus (Correct Answer)
B. Hyperthyroidism
C. Hypothyroidism
D. Pheochromocytoma

Explanation: ### Explanation **Correct Option: A. Diabetes mellitus** The patient presents with the classic triad of **Chronic Pancreatitis (CP)**: chronic abdominal pain, pancreatic calcifications (visible on imaging), and maldigestion (steatorrhea) [1]. In chronic pancreatitis, especially when caused by long-term alcohol abuse, there is progressive fibro-inflammatory destruction of the pancreatic parenchyma [1]. This destruction affects both the **exocrine** and **endocrine** functions of the gland. As the disease advances, the destruction of the Islets of Langerhans leads to a deficiency in insulin, glucagon, and pancreatic polypeptide. This results in **"Type 3c Diabetes Mellitus"** (pancreatogenic diabetes). Unlike Type 1 or Type 2 DM, these patients are particularly prone to hypoglycemia because they lack the counter-regulatory hormone glucagon. **Why Incorrect Options are Wrong:** * **B & C (Hyper/Hypothyroidism):** Thyroid dysfunction is an autoimmune or iodine-related endocrine disorder. There is no direct pathophysiological link between chronic pancreatitis/alcoholism and the thyroid gland. * **D (Pheochromocytoma):** This is a catecholamine-secreting tumor of the adrenal medulla. While it can cause hyperglycemia (via glycogenolysis), it is not a complication of pancreatic calcification or chronic alcohol abuse. **High-Yield Clinical Pearls for NEET-PG:** * **Classic Triad of CP:** Steatorrhea, Diabetes Mellitus, and Pancreatic Calcifications (though all three are present in only <30% of patients). * **Most Common Cause:** Alcoholism (Adults); Cystic Fibrosis (Children) [1]. * **Imaging:** CT scan is more sensitive than Ultrasound for detecting calcifications. The "Chain of Lakes" appearance on ERCP/MRCP indicates ductal dilation and strictures [1]. * **Management of Pain:** Step-ladder approach; antioxidants and pancreatic enzyme supplementation (to suppress CCK-driven stimulation) are often used. * **Malignancy Risk:** Chronic pancreatitis is a significant risk factor for **Pancreatic Adenocarcinoma**.

Question 534: Which of the following statements about peptic ulcer disease is true?

A. Helicobacter pylori eradication increases the likelihood of occurrence of complications.
B. The incidence of complications has remained unchanged. (Correct Answer)
C. The incidence of Helicobacter pylori reinfection in India is very low.
D. Helicobacter pylori eradication does not alter the recurrence ratio.

Explanation: ### Explanation **Correct Option: B. The incidence of complications has remained unchanged.** While the overall incidence of Peptic Ulcer Disease (PUD) has significantly declined due to effective *H. pylori* eradication and the widespread use of Proton Pump Inhibitors (PPIs), the incidence of **complications** (such as perforation and hemorrhage) has remained relatively stable. This is primarily attributed to the increasing use of Non-Steroidal Anti-Inflammatory Drugs (NSAIDs) and low-dose aspirin among the aging population, which offsets the gains made by treating *H. pylori* [1]. **Analysis of Incorrect Options:** * **Option A:** *H. pylori* eradication **decreases** the likelihood of complications. It is the most effective strategy to prevent ulcer recurrence and subsequent bleeding or perforation [1]. * **Option C:** In developing countries like India, the reinfection rate of *H. pylori* is **high** (often >2% per year) due to overcrowding, poor sanitation, and contaminated water sources, unlike the low rates (<1%) seen in developed nations. * **Option D:** *H. pylori* eradication **dramatically alters** the recurrence ratio. Without eradication, ulcer recurrence rates are 60–90%; after successful eradication, this drops to <10% [1]. **High-Yield Clinical Pearls for NEET-PG:** * **Most common complication of PUD:** Upper GI Bleed (Hematemesis/Melena) [1]. * **Most common site of perforation:** Anterior wall of the duodenum [1]. * **H. pylori Association:** Strongly linked to Duodenal Ulcers (90-95%) more than Gastric Ulcers (70-80%) [1]. * **Investigation of Choice:** Upper GI Endoscopy (UGIE). * **Gold Standard for H. pylori diagnosis:** Endoscopic biopsy followed by Histopathology (though Urease Breath Test is the best non-invasive test for confirming eradication) [1].

Question 535: Pancreatic cholera is characterized by all except?

A. Hypochlorhydria
B. Hyokalemia
C. Glucose intolerance
D. Hypocalcemia (Correct Answer)

Explanation: Explanation: Pancreatic cholera, also known as **WDHA syndrome** (Watery Diarrhea, Hypokalemia, Achlorhydria) or **Verner-Morrison syndrome**, is caused by a **VIPoma**—a neuroendocrine tumor (usually in the pancreas) that secretes excessive Vasoactive Intestinal Peptide (VIP) [1]. **Why Hypocalcemia is the correct answer:** Pancreatic cholera is typically associated with **Hypercalcemia**, not hypocalcemia [1]. This occurs because VIP has a direct bone-resorbing effect and because VIPomas are frequently associated with **MEN-1 syndrome**, where co-existing hyperparathyroidism leads to elevated calcium levels. **Analysis of Incorrect Options:** * **Hypochlorhydria (A):** VIP inhibits gastric acid secretion by parietal cells, leading to achlorhydria or hypochlorhydria. * **Hypokalemia (B):** Massive watery diarrhea (often >3L/day) leads to significant fecal loss of potassium, resulting in profound hypokalemia and muscle weakness. * **Glucose intolerance (C):** VIP stimulates glycogenolysis in the liver and inhibits insulin secretion, leading to hyperglycemia and impaired glucose tolerance in about 50% of patients. **Clinical Pearls for NEET-PG:** * **Mnemonic (WDHA):** **W**atery **D**iarrhea, **H**ypokalemia, **A**chlorhydria. * **Stool Characteristics:** The diarrhea is "secretory" in nature (persists during fasting) and has a low osmotic gap. * **Diagnosis:** Elevated fasting plasma VIP levels (>200 pg/mL). * **Localization:** Most VIPomas are found in the **tail of the pancreas**. * **Management:** Octreotide (Somatostatin analogue) is used to control symptoms by inhibiting VIP release.

Question 536: All of the following are true for patients with ulcerative colitis associated with primary sclerosing cholangitis (PSC), EXCEPT:

A. They may develop biliary cirrhosis.
B. May have a raised alkaline phosphatase.
C. Increased risk of hilar cholangiocarcinoma.
D. PSC reverses after a total colectomy. (Correct Answer)

Explanation: The correct answer is **D**. The underlying medical concept is that **Primary Sclerosing Cholangitis (PSC)** follows a clinical course independent of the underlying **Ulcerative Colitis (UC)** [2]. While approximately 70-80% of PSC patients have UC [3], performing a total colectomy (which is curative for the intestinal symptoms of UC) does not halt, reverse, or prevent the progression of PSC or the risk of associated biliary malignancies. **Analysis of Options:** * **Option A (Biliary Cirrhosis):** True. PSC is a chronic cholestatic disease characterized by progressive inflammation and fibrosis of the intrahepatic and extrahepatic bile ducts. This leads to "beading" on imaging and eventually results in secondary biliary cirrhosis and liver failure. * **Option B (Raised Alkaline Phosphatase):** True. A cholestatic pattern of liver enzymes is the hallmark of PSC. An elevated serum alkaline phosphatase (ALP) is often the first biochemical abnormality detected, even in asymptomatic patients [1]. * **Option C (Hilar Cholangiocarcinoma):** True. Patients with PSC have a significantly increased lifetime risk (up to 10-15%) of developing cholangiocarcinoma, most commonly at the biliary confluence (Klatskin tumor/hilar type). **NEET-PG High-Yield Pearls:** * **Gold Standard Diagnosis:** MRCP (shows "string of beads" appearance). Liver biopsy shows pathognomonic **"onion-skin" fibrosis**. * **Antibody:** p-ANCA is positive in 60-80% of cases [1], [3]. * **Cancer Risks:** PSC increases the risk of both **Cholangiocarcinoma** and **Colorectal Cancer** (more so than UC alone). * **Treatment:** Liver transplantation is the only definitive treatment for end-stage PSC; medical therapies like Ursodeoxycholic acid (UDCA) improve biochemistry but not survival.

Question 537: All of the following are true of achalasia cardia, except:

A. Dysphagia
B. Aspiration pneumonitis
C. Mecholyl test is hyposensitive (Correct Answer)
D. X-ray finding of dilated esophagus with a narrow end

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 [2]. This occurs due to the degeneration of the inhibitory neurons (containing NO and VIP) in the **myenteric (Auerbach’s) plexus** [1][2]. **Why Option C is the correct answer (The Exception):** The **Mecholyl (Methacholine) test** is based on **Cannon’s Law of Denervation Supersensitivity**. In achalasia, the loss of ganglionic cells makes the esophageal smooth muscle **hypersensitive** to cholinergic stimulation. When a parasympathomimetic like Mecholyl is administered, it triggers a vigorous, high-amplitude contraction of the esophagus. Therefore, the test is **hypersensitive**, not hyposensitive. (Note: This test is largely historical and replaced by manometry). **Analysis of Incorrect Options:** * **A. Dysphagia:** This is the most common presenting symptom. It is characteristically paradoxical, occurring for both solids and liquids from the onset [2]. * **B. Aspiration pneumonitis:** Due to the failure of the LES to open, food and saliva pool in the dilated esophagus. Regurgitation of this undigested material, especially at night, leads to nocturnal cough and aspiration pneumonia [2]. * **D. X-ray finding:** A Barium swallow typically shows a dilated esophagus with a smooth, tapered narrowing at the distal end, described as the **"Bird’s beak"** or **"Rat-tail"** appearance [2]. **High-Yield Clinical Pearls for NEET-PG:** * **Gold Standard Diagnosis:** Esophageal Manometry (shows incomplete LES relaxation and aperistalsis) [2]. * **Most common symptom:** Dysphagia. * **Most common complication:** Esophagitis; however, there is an increased risk of **Squamous Cell Carcinoma** (due to chronic stasis). * **Treatment of choice:** Heller’s Myotomy (often with Dor/Toupet fundoplication) [1] or POEM (Peroral Endoscopic Myotomy).

Question 538: A patient with a known history of pancreatitis presents on Day 4 with breathlessness and basal crepitations. What is the most likely diagnosis?

A. Atelectasis
B. Pleural effusions
C. Acute respiratory distress syndrome (ARDS) (Correct Answer)
D. Aspiration pneumonia

Explanation: ### Explanation **Correct Answer: C. Acute Respiratory Distress Syndrome (ARDS)** In the context of acute pancreatitis, the development of respiratory distress within the first week (typically days 2–5) [1] is a classic presentation of **ARDS**. * **Pathophysiology:** Pancreatitis triggers a systemic inflammatory response syndrome (SIRS). Pancreatic enzymes (like phospholipase A2) are released into the circulation, damaging the alveolar-capillary membrane and destroying pulmonary surfactant [1]. This leads to non-cardiogenic pulmonary edema, characterized by bilateral infiltrates and hypoxemia [1]. * **Clinical Clue:** The timing (Day 4) and the presence of basal crepitations (reflecting alveolar fluid) in a patient with systemic inflammation strongly point toward ARDS, which is the most common serious pulmonary complication and a leading cause of death in early pancreatitis [2]. **Why other options are incorrect:** * **A. Atelectasis:** While common due to diaphragmatic splinting from abdominal pain, it usually presents earlier and rarely causes significant respiratory distress or widespread crepitations unless massive. * **B. Pleural Effusion:** Frequently seen in pancreatitis (usually left-sided), but it typically presents with diminished breath sounds and stony dullness on percussion rather than diffuse crepitations. * **D. Aspiration Pneumonia:** While possible in patients with vomiting or altered sensorium, it is less common than the systemic inflammatory lung injury (ARDS) seen in the natural history of severe pancreatitis. **Clinical Pearls for NEET-PG:** * **PaO2/FiO2 Ratio:** ARDS is defined by a ratio <300 mmHg. * **Ranson’s Criteria:** A fall in PaO2 <60 mmHg within 48 hours is a key prognostic marker for severe pancreatitis [2]. * **Chest X-ray:** ARDS shows "white-out" lungs or bilateral fluffy infiltrates with a normal-sized heart (distinguishing it from heart failure) [1]. * **Most common pulmonary complication:** Pleural effusion is the most common, but ARDS is the most severe/lethal early complication.

Question 539: A patient on enteral nutrition develops diarrhea. Which of the following statements is/are true?

A. Diarrhea seen in > 30% cases (Correct Answer)
B. More diarrhea in duodenal nutrition than jejunal nutrition
C. Most common cause is contamination of food
D. In persistent diarrhea, Clostridium difficile should be excluded

Explanation: **Explanation:** Diarrhea is the most common gastrointestinal complication of enteral nutrition (EN), occurring in **30% to 50% of patients** depending on the definition used and the clinical setting (ICU vs. ward). **Analysis of Options:** * **A (Correct):** Diarrhea is highly prevalent in patients receiving EN, with studies consistently showing rates exceeding 30%. It is often multifactorial, related to the underlying illness, medications, or the feeding process itself. * **B (Incorrect):** There is no significant clinical evidence that duodenal feeding causes more diarrhea than jejunal feeding. In fact, post-pyloric feeding (both duodenal and jejunal) is often used to bypass gastric stasis, though it does not inherently increase the risk of diarrhea compared to gastric feeding. * **C (Incorrect):** While contamination is a risk, the **most common cause** of diarrhea in these patients is actually **concurrent medication use** (especially antibiotics, prokinetics, and sorbitol-containing liquid medications) or the underlying disease process (e.g., sepsis, hypoalbuminemia) [1]. * **D (Incorrect):** While *C. difficile* is a concern in hospitalized patients, it is not the *first* or most common cause to exclude in enteral nutrition-related diarrhea [1]. The initial management focuses on reviewing medications and adjusting the delivery rate/osmolarity of the feed. **NEET-PG High-Yield Pearls:** * **Management:** Do not automatically stop enteral feeds for diarrhea. Instead, decrease the rate of infusion, review medications (especially those with high osmolarity), and ensure the feed is at room temperature. * **Fiber:** Adding soluble fiber (e.g., guar gum) can help manage diarrhea in EN patients. * **Osmolarity:** Standard enteral formulas are usually isotonic; however, hyperosmolar feeds or rapid "bolus" delivery into the small intestine (Dumping Syndrome) can trigger osmotic diarrhea.

Question 540: All of the following are associated with ulcerative colitis except?

A. Erythema nodosum
B. Circinate balanitis (Correct Answer)
C. Sclerosing cholangitis
D. Aphthous stomatitis

Explanation: **Explanation:** The correct answer is **Circinate balanitis**. This condition is a characteristic feature of **Reactive Arthritis** (formerly Reiter’s Syndrome), not Ulcerative Colitis (UC). It presents as painless, serpiginous dermatitis on the glans penis. **Why the other options are incorrect:** Ulcerative Colitis is associated with several **Extraintestinal Manifestations (EIMs)** [1], which are frequently tested in NEET-PG: * **Erythema nodosum (Option A):** This is the most common skin manifestation of Inflammatory Bowel Disease (IBD) [1]. It typically correlates with the activity of the underlying bowel disease. * **Primary Sclerosing Cholangitis (PSC) (Option C):** This is highly specific to UC (found in ~5% of patients). Unlike other EIMs, the course of PSC is **independent** of the bowel disease activity and is not cured by colectomy. * **Aphthous stomatitis (Option D):** These painful oral ulcers are common in both UC and Crohn’s disease and often parallel the severity of intestinal inflammation. **NEET-PG High-Yield Pearls:** 1. **Skin:** Pyoderma gangrenosum is more specific to UC, while Erythema nodosum is more common [1]. 2. **Eyes:** Episcleritis and Uveitis are common EIMs [1]. 3. **Joints:** Peripheral arthritis (Type 1 and 2) and Ankylosing Spondylitis (HLA-B27 associated) [1]. 4. **Key Distinction:** EIMs that **parallel** bowel activity include Erythema nodosum, Peripheral arthritis, and Episcleritis. EIMs **independent** of bowel activity include PSC and Ankylosing Spondylitis.

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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