Gastroenterology — MCQs
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All of the following are classification systems of portal hypertensive gastropathy, EXCEPT:
Which of the following would be least likely to cause an ulcer in the distal esophagus?
A 23-year-old man has noted a yellow color to his sclerae for the past 2 weeks. On physical examination, he has generalized jaundice. He has the physique of a bodybuilder. Laboratory studies show serum total bilirubin, 5.6 mg/dL; ALT, 117 U/L; AST, 103 U/L; alkaline phosphatase, 148 U/L; albumin, 5.5 g/dL; and total protein, 7.9 g/dL. Which of the following substances is he most likely to be using?
Which of the following is NOT a treatment for hepatic encephalopathy?
Adequacy of D-penicillamine treatment in Wilson's disease is monitored by measuring which of the following?
Toxic megacolon is seen in:
A 40-year-old lady presents with an Alkaline Phosphatase (ALP) of 550 U/L, SGOT of 75 U/L, total serum bilirubin of 6.5 mg/dL, and conjugated serum bilirubin of 4.3 mg/dL. What is the most likely diagnosis?
The triad originally described for Zollinger-Ellison syndrome is characterized by which of the following?
Very high serum transaminases (ALT/AST > 1000 IU/L) are seen in the following conditions except?
A 50-year-old male executive presents to the casualty with hypotension and hematemesis. There is a history of daily alcohol intake of 100 ml. The estimated blood loss is around 2 litres. What is the most probable diagnosis?
Gastroenterology Indian Medical PG Practice Questions and MCQs
Question 551: All of the following are classification systems of portal hypertensive gastropathy, EXCEPT:
- A. McCormack
- B. Tanoue
- C. Los Angeles (Correct Answer)
- D. NIEC = New Italian Endoscopic Club
Explanation: **Explanation:** The correct answer is **C. Los Angeles**. **1. Why Los Angeles is the correct answer:** The **Los Angeles (LA) Classification** is the gold-standard system used to grade the severity of **Gastroesophageal Reflux Disease (GERD)** based on the extent of mucosal breaks (Grades A to D) [1]. It is not used for portal hypertensive gastropathy (PHG). **2. Analysis of incorrect options (Classification systems for PHG):** * **McCormack Classification:** This is the most widely used system for PHG. It categorizes the condition into **Mild** (fine pinkish speckling/scarlatiniform rash) and **Severe** (discrete red spots or "snake-skin" mosaic pattern). * **Tanoue Classification:** A Japanese classification system that divides PHG into three grades (Grade 1: mild/reddish; Grade 2: severe/mosaic; Grade 3: very severe/hemorrhagic). * **NIEC (New Italian Endoscopic Club):** This system classifies PHG based on the presence of a mosaic pattern and the color of the spots (red or brown), further grading them by severity. **3. High-Yield Clinical Pearls for NEET-PG:** * **Definition:** PHG refers to changes in the gastric mucosa (typically the fundus and body) in patients with portal hypertension, characterized by a **"snake-skin" or "mosaic" appearance**. * **Pathophysiology:** It is caused by congestion and ectasia of mucosal/submucosal vessels, *not* primary inflammation. * **Management:** The mainstay of treatment is reducing portal pressure using **non-selective beta-blockers (Propranolol/Nadolol)**. For refractory bleeding, TIPS may be considered. * **Distinction:** Do not confuse PHG with **GAVE (Gastric Antral Vascular Ectasia)**, also known as "Watermelon Stomach," which is typically found in the antrum and does not always correlate with the severity of portal hypertension [1].
Question 552: Which of the following would be least likely to cause an ulcer in the distal esophagus?
- A. HSV
- B. Achalasia cardia
- C. Severe reflux esophagitis
- D. Zenker's diverticulum (Correct Answer)
Explanation: The correct answer is **Zenker’s diverticulum**. The key to this question lies in the **anatomical location**. Zenker’s diverticulum is a pulsion diverticulum occurring at the **Killian’s dehiscence** (between the thyropharyngeus and cricopharyngeus muscles). This is located in the **proximal (upper) esophagus** or hypopharynx [1]. Therefore, it is anatomically impossible for it to cause an ulcer in the **distal esophagus**. **Analysis of Options:** * **HSV (Herpes Simplex Virus):** Viral esophagitis typically affects the squamous epithelium of the mid-to-distal esophagus. HSV characteristically causes small, "punched-out" ulcers. * **Achalasia Cardia:** While primarily a motility disorder, stasis of food and saliva in the dilated distal esophagus can lead to "stasis esophagitis" and subsequent mucosal ulceration [1]. * **Severe Reflux Esophagitis (GERD):** This is the most common cause of distal esophageal ulcers [2]. Chronic exposure to gastric acid and pepsin leads to mucosal erosion, typically just above the gastroesophageal junction. **NEET-PG High-Yield Pearls:** 1. **Zenker’s Diverticulum:** Presents with halitosis, regurgitation of undigested food, and a neck mass that "gurgles." It is a *false* diverticulum (only mucosa and submucosa herniate) [1]. 2. **Drug-Induced Esophagitis:** Often occurs at the level of the **arch of the aorta** (mid-esophagus) due to anatomical narrowing. Common culprits: Tetracyclines, NSAIDs, and Bisphosphonates. 3. **Cytomegalovirus (CMV):** Unlike the "punched-out" ulcers of HSV, CMV typically causes **large, solitary, linear ulcers** in the distal esophagus, especially in immunocompromised patients.
Question 553: A 23-year-old man has noted a yellow color to his sclerae for the past 2 weeks. On physical examination, he has generalized jaundice. He has the physique of a bodybuilder. Laboratory studies show serum total bilirubin, 5.6 mg/dL; ALT, 117 U/L; AST, 103 U/L; alkaline phosphatase, 148 U/L; albumin, 5.5 g/dL; and total protein, 7.9 g/dL. Which of the following substances is he most likely to be using?
- A. Acetaminophen
- B. Anabolic steroid (Correct Answer)
- C. Chlorpromazine
- D. Ethyl alcohol
Explanation: ### Explanation The clinical presentation points toward **drug-induced cholestasis** caused by **anabolic-androgenic steroids (AAS)**. **1. Why Anabolic Steroids are correct:** The patient is a bodybuilder presenting with jaundice and laboratory evidence of **cholestatic liver injury** [1]. Key indicators include: * **Physique:** A "bodybuilder" physique is a classic clinical clue for AAS use. * **Laboratory Pattern:** The bilirubin is significantly elevated (5.6 mg/dL), while transaminases (ALT/AST) are only mildly elevated (around 100 U/L) [2]. This "bland cholestasis" (high bilirubin with minimal enzyme elevation) is characteristic of 17α-alkylated steroids [3]. * **Albumin:** The high-normal albumin (5.5 g/dL) suggests good synthetic function and high protein intake, common in fitness enthusiasts. **2. Why the other options are incorrect:** * **Acetaminophen:** Toxicity typically causes **massive** elevation of transaminases (often >3,000 U/L) and signs of acute liver failure, not isolated jaundice in a healthy-looking individual [1]. * **Chlorpromazine:** While it causes cholestatic jaundice, it is an antipsychotic. There is no clinical context (e.g., psychiatric history) to favor this over steroids in a bodybuilder. * **Ethyl Alcohol:** Alcoholic hepatitis usually presents with an **AST:ALT ratio > 2:1**, and transaminases rarely exceed 300-500 U/L. The patient’s physique and lab profile do not fit chronic alcohol abuse. **3. High-Yield Pearls for NEET-PG:** * **AAS-induced Liver Injury:** Can manifest as bland cholestasis, peliosis hepatis (blood-filled cysts), or hepatocellular carcinoma. * **Bland Cholestasis:** Characterized by jaundice and pruritus with minimal inflammation or necrosis on histology [3]. * **Diagnostic Clue:** In exams, "bodybuilder + jaundice" almost always equals anabolic steroid use. * **Albumin/Protein:** High total protein with normal albumin in this context reflects a high-protein diet rather than pathology.
Question 554: Which of the following is NOT a treatment for hepatic encephalopathy?
- A. High protein diet (Correct Answer)
- B. Lactulose
- C. Oral neomycin
- D. Enema
Explanation: Explanation: Hepatic Encephalopathy (HE) is a reversible neuropsychiatric syndrome caused by liver failure and portosystemic shunting [1]. The primary pathophysiology involves the accumulation of neurotoxic substances, most notably ammonia ($NH_3$), which crosses the blood-brain barrier [1]. Why Option A is the correct answer: Ammonia is a byproduct of protein metabolism by intestinal bacteria [1]. Historically, protein restriction was practiced; however, modern guidelines emphasize that high protein intake (1.2–1.5 g/kg/day) is essential to prevent muscle wasting (sarcopenia), which actually worsens HE because muscle helps detoxify ammonia [2]. Therefore, a "high protein diet" is a nutritional requirement, but protein restriction (not high protein) was the traditional (though now largely obsolete) "treatment" logic. In the context of this question, a high protein diet does not treat an acute episode; rather, it is the management of the underlying nutritional state. Why the other options are incorrect: * Lactulose (Option B): The first-line treatment. It is a non-absorbable disaccharide that acidifies the colon, converting $NH_3$ to non-absorbable $NH_4^+$ (ammonia trapping) and acts as an osmotic laxative. * Oral Neomycin (Option C): An antibiotic that reduces ammonia-producing bacteria in the gut. (Rifaximin is now preferred due to lower toxicity). * Enema (Option D): Used to rapidly clear the bowel of nitrogenous waste and blood (a common precipitant), reducing ammonia absorption. NEET-PG High-Yield Pearls: * Drug of Choice: Lactulose (for acute and maintenance). * Best Add-on Therapy: Rifaximin (reduces recurrence). * Most common precipitant: Infections (SBP), GI bleed, dehydration, or constipation. * Flumazenil: May be used transiently if benzodiazepine overdose is suspected as a trigger.
Question 555: Adequacy of D-penicillamine treatment in Wilson's disease is monitored by measuring which of the following?
- A. 24-hour urinary copper (Correct Answer)
- B. Serum ceruloplasmin
- C. Disappearance of Kayser-Fleischer rings
- D. Serum copper level in the fasting state
Explanation: ### Explanation **Correct Option: A (24-hour urinary copper)** D-penicillamine is a chelating agent that works by increasing the urinary excretion of copper. To monitor the **adequacy and compliance** of treatment, 24-hour urinary copper excretion is the gold standard. * **Initial Phase:** During the start of therapy, urinary copper levels are very high (>1000 µg/day). * **Maintenance Phase:** The goal is to maintain urinary copper excretion between **200–500 µg/day**. Levels below this range suggest non-compliance or under-dosage, while levels significantly higher may indicate the need for dose adjustment. **Why other options are incorrect:** * **B. Serum Ceruloplasmin:** This is a diagnostic marker (usually <20 mg/dL in Wilson's), but it does not change significantly with treatment and is not used for monitoring adequacy. [2] * **C. Disappearance of Kayser-Fleischer (KF) rings:** While KF rings may regress or disappear with successful treatment, this is a slow, subjective clinical finding and not a precise biochemical measure for titrating drug dosage. * **D. Serum copper level:** Total serum copper is usually low in Wilson's disease. While "Free Serum Copper" (Non-ceruloplasmin bound copper) is used to monitor therapy (target <10 µg/dL), total serum copper in a fasting state is not the standard monitoring tool. [1] **High-Yield Clinical Pearls for NEET-PG:** * **Drug of Choice:** D-Penicillamine is the first-line chelator, but **Trientine** is preferred if the patient is intolerant or has neurological worsening. * **Mechanism:** D-penicillamine inhibits pyridoxine; hence, **Vitamin B6 supplementation** is mandatory. * **Monitoring Toxicity:** D-penicillamine can cause nephrotic syndrome and bone marrow suppression; regular **urinalysis and CBC** are required. * **Triad of Wilson's:** Liver disease, Neurological symptoms (Basal ganglia involvement), and KF rings (Descemet's membrane). [1]
Question 556: Toxic megacolon is seen in:
- A. Carcinoma of the colon
- B. Gastrocolic fistula
- C. Ulcerative colitis (Correct Answer)
- D. Amoebic colitis
Explanation: **Explanation:** **Toxic Megacolon** is a life-threatening complication characterized by total or segmental non-obstructive colonic dilatation (usually >6 cm) associated with systemic toxicity. **Why Ulcerative Colitis (UC) is correct:** UC is the most common cause of toxic megacolon. The pathogenesis involves severe transmural inflammation that reaches the muscularis propria. This leads to the release of inflammatory mediators (like Nitric Oxide) which inhibit smooth muscle tone, causing colonic paralysis, thinning of the wall, and rapid dilatation [1]. It is often precipitated by hypokalemia, narcotics, or colonoscopy during an acute flare. **Analysis of Incorrect Options:** * **A. Carcinoma of the colon:** While it causes mechanical obstruction and proximal dilatation, it does not typically cause the acute, non-obstructive inflammatory paralysis seen in toxic megacolon. * **B. Gastrocolic fistula:** This is a communication between the stomach and colon (often due to malignancy or ulcers) leading to malabsorption and feculent vomiting, but not acute colonic dilatation [1]. * **D. Amoebic colitis:** While infectious colitides (like *C. difficile* or Amoebiasis) *can* cause toxic megacolon, UC remains the classic and most frequent association in exam vignettes. **NEET-PG High-Yield Pearls:** * **Diagnostic Criteria (Jalan’s Criteria):** Radiographic evidence of colonic dilatation >6 cm + 3 of (Fever >38°C, HR >120, WBC >10,500, Anemia) + 1 of (Dehydration, Electrolyte imbalance, Hypotension). * **Most common site of dilatation:** Transverse colon (due to gas rising in the supine position). * **Management:** Initial management is medical (NPO, IV fluids, IV steroids, broad-spectrum antibiotics). If no improvement in 24–72 hours, **Emergency Subtotal Colectomy with Ileostomy** is the treatment of choice [2]. * **Contraindication:** Barium enema and Colonoscopy are strictly contraindicated during an acute flare due to the high risk of perforation [1].
Question 557: A 40-year-old lady presents with an Alkaline Phosphatase (ALP) of 550 U/L, SGOT of 75 U/L, total serum bilirubin of 6.5 mg/dL, and conjugated serum bilirubin of 4.3 mg/dL. What is the most likely diagnosis?
- A. Dubin-Johnson syndrome
- B. Obstructive jaundice (Correct Answer)
- C. Viral hepatitis
- D. Cholelithiasis
Explanation: ### Explanation The clinical presentation and biochemical profile point toward a **cholestatic (obstructive) pattern** of jaundice. #### 1. Why Obstructive Jaundice is Correct The key to this diagnosis lies in the **disproportionate elevation of Alkaline Phosphatase (ALP)** compared to transaminases (SGOT/AST). [1] * **ALP elevation (>3x upper limit):** ALP is found in the biliary canalicular membrane. Its significant rise (550 U/L) indicates biliary obstruction or cholestasis. [1] * **Conjugated Hyperbilirubinemia:** The total bilirubin is 6.5 mg/dL with a conjugated fraction of 4.3 mg/dL (>50%). This confirms that the liver can conjugate bilirubin, but its excretion into the intestine is impaired. [2] * **Mild Transaminitis:** SGOT is only mildly elevated (75 U/L), ruling out primary hepatocellular injury. [3] #### 2. Why Other Options are Incorrect * **Dubin-Johnson Syndrome:** While this causes conjugated hyperbilirubinemia, it is a benign genetic defect in bilirubin excretion. **ALP and SGOT levels remain normal**, which contradicts this case. * **Viral Hepatitis:** This is a hepatocellular pathology. It typically presents with **massive elevation of transaminases (ALT/AST > 500-1000 U/L)**, while ALP is only mildly elevated. [1] * **Cholelithiasis:** This refers to stones in the gallbladder. Unless a stone migrates to the Common Bile Duct (Choledocholithiasis) to cause obstruction, simple cholelithiasis does not cause jaundice or elevated ALP. #### 3. NEET-PG High-Yield Pearls * **R-Value (De Ritis Ratio):** Used to differentiate liver injury. $R = (ALT/ULN) \div (ALP/ULN)$. $R > 5$ suggests hepatocellular; $R < 2$ suggests cholestatic. * **GGT Correlation:** To confirm ALP is of biliary origin (and not bone), check **Gamma-Glutamyl Transferase (GGT)** or 5'-nucleotidase. [1] * **Imaging:** The first-line investigation for suspected obstructive jaundice is an **Ultrasound (USG) abdomen** to look for dilated intrahepatic biliary radicals (IHBR).
Question 558: The triad originally described for Zollinger-Ellison syndrome is characterized by which of the following?
- A. Peptic ulceration, gastric hypersecretion, non-beta cell tumor (Correct Answer)
- B. Peptic ulceration, gastric hypersecretion, beta cell tumor
- C. Peptic ulceration, achlorhydria, non-beta cell tumor
- D. None of the above
Explanation: Zollinger-Ellison Syndrome (ZES) is caused by a gastrin-secreting neuroendocrine tumor (gastrinoma), typically located in the "gastrinoma triangle" (duodenum, pancreas, or porta hepatis). **1. Why Option A is correct:** The classic triad, as originally described by Zollinger and Ellison in 1955, consists of: * **Non-beta cell tumor of the pancreas:** These tumors arise from the delta cells or G-cells (neuroendocrine cells), not the insulin-producing beta cells. * **Gastric acid hypersecretion:** Excessive gastrin leads to massive overproduction of hydrochloric acid by parietal cells. * **Severe peptic ulceration:** The hyperacidity results in multiple, refractory, or atypically located ulcers (e.g., in the distal duodenum or jejunum). **2. Why other options are incorrect:** * **Option B:** Beta-cell tumors are **insulinomas**, which cause hypoglycemia, not gastric hypersecretion. * **Option C:** **Achlorhydria** (absence of HCl) is the opposite of what occurs in ZES. Achlorhydria is seen in conditions like Pernicious Anemia or VIPomas (WDHA syndrome). **High-Yield Clinical Pearls for NEET-PG:** * **Diagnosis:** The best initial screening test is **fasting serum gastrin levels** (>1000 pg/mL is diagnostic). The most sensitive provocative test is the **Secretin Stimulation Test** (paradoxical rise in gastrin). * **Association:** Approximately 25% of ZES cases are associated with **Multiple Endocrine Neoplasia Type 1 (MEN1)**. * **Clinical Feature:** Chronic diarrhea is a common symptom due to the inactivation of pancreatic enzymes by low luminal pH. * **Localization:** Somatostatin receptor scintigraphy (Octreoscan) is the imaging modality of choice for localization.
Question 559: Very high serum transaminases (ALT/AST > 1000 IU/L) are seen in the following conditions except?
- A. Viral hepatitis
- B. Ischemic liver injury
- C. Toxin-induced liver injury
- D. Alcoholic liver disease (Correct Answer)
Explanation: In clinical practice, serum transaminase levels (AST and ALT) exceeding **1000 IU/L** indicate acute, massive hepatocellular necrosis [1]. **1. Why Alcoholic Liver Disease (ALD) is the correct answer:** In ALD, transaminases are typically only mildly to moderately elevated (usually **<300–500 IU/L**). This occurs because alcoholics are often deficient in **Pyridoxal-5'-phosphate (Vitamin B6)**, a necessary cofactor for ALT synthesis. Consequently, the liver cannot produce high levels of these enzymes despite significant injury. A classic high-yield finding in ALD is an **AST:ALT ratio > 2:1**. **2. Why the other options are incorrect:** * **Viral Hepatitis:** Acute infection with hepatotropic viruses (A, B, or E) commonly causes "flaming" hepatitis with transaminases often reaching 1000–3000+ IU/L [1]. * **Ischemic Liver Injury ("Shock Liver"):** Rapid, massive elevation of AST/ALT (often >5000 IU/L) occurs due to hypoperfusion. A hallmark is the rapid rise followed by a rapid fall (within 48–72 hours) once perfusion is restored. * **Toxin-induced Liver Injury:** Acetaminophen (Paracetamol) toxicity is the most common cause of extremely high transaminases, sometimes exceeding 10,000 IU/L [1]. **Clinical Pearls for NEET-PG:** * **Highest elevations (>5000 IU/L):** Usually seen in Ischemic hepatitis or Acetaminophen toxicity [1]. * **AST > ALT:** Seen in Alcoholic liver disease, Cirrhosis, and Ischemic hepatitis. * **ALT > AST:** Seen in most cases of Acute Viral Hepatitis and NAFLD. * **Biliary Obstruction:** Acute common bile duct stones can cause a transient "spike" in transaminases (>1000) before bilirubin rises, but they settle quickly.
Question 560: A 50-year-old male executive presents to the casualty with hypotension and hematemesis. There is a history of daily alcohol intake of 100 ml. The estimated blood loss is around 2 litres. What is the most probable diagnosis?
- A. Gastritis
- B. Duodenal ulcer (Correct Answer)
- C. Mallory-Weiss tear
- D. Esophageal varices
Explanation: ### Explanation The correct diagnosis is **Duodenal Ulcer (DU)**. **1. Why Duodenal Ulcer is correct:** In any patient presenting with massive upper gastrointestinal bleeding (UGIB), **Peptic Ulcer Disease (PUD)** is statistically the most common cause worldwide [1]. This patient has lost approximately 2 liters of blood (Class IV Hemorrhage), leading to hypotension [1]. While alcohol is a risk factor for several GI conditions, a massive bleed of this magnitude is most characteristically associated with a posterior duodenal ulcer eroding into the **gastroduodenal artery**. **2. Why other options are incorrect:** * **Gastritis (Option A):** While alcohol causes erosive gastritis, it typically presents with "coffee-ground" emesis or mild hematemesis. It rarely causes massive, life-threatening hemorrhage leading to hypotension. * **Mallory-Weiss Tear (Option C):** This involves a mucosal tear at the gastroesophageal junction, usually following forceful vomiting or retching. While it causes hematemesis, the bleeding is typically self-limiting and rarely results in a 2-liter blood loss. * **Esophageal Varices (Option D):** Although the patient consumes alcohol, there are no mentioned signs of chronic liver disease (stigmata like jaundice, ascites, or splenomegaly) [1]. Statistically, even in heavy drinkers, PUD remains a more frequent cause of UGIB than varices unless portal hypertension is established [1]. **Clinical Pearls for NEET-PG:** * **Most common cause of UGIB:** Peptic Ulcer Disease (Duodenal > Gastric) [1]. * **Rockall Score & Blatchford Score:** Used to risk-stratify patients with UGIB [1]. * **Management Priority:** Hemodynamic stabilization (IV fluids/blood) takes precedence over diagnostic endoscopy. * **Vessel involved in DU bleed:** Gastroduodenal artery (posterior ulcers). * **Vessel involved in GU bleed:** Left gastric artery (lesser curvature ulcers).
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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