Gastroenterology — MCQs

A 66-year-old woman with a history of chronic alcohol abuse has had headaches and nausea for the past 4 days. She has become increasingly obtunded. On physical examination, she has right upper quadrant tenderness, tachycardia, tachypnea, and hypotension. Laboratory studies show serum AST of 475 U/L, ALT of 509 U/L, alkaline phosphatase of 23 U/L, total bilirubin of 0.9 mg/dL, albumin of 3.8 g/dL, and total protein of 6.1 g/dL. She is treated with N-acetylcysteine. Which of the following drugs has she most likely ingested in excess?

Q327Medium

Which of the following is NOT a hallmark of celiac sprue?

Q328Easy

Anti-LKM antibodies are found in which condition?

Q329Medium

Which extra-intestinal symptom of IBD worsens with exacerbation of disease activity?

Q330Easy

Which of the following is more commonly associated with acute liver failure?

Gastroenterology Indian Medical PG Practice Questions and MCQs

Question 321: Which of the following statements regarding diagnostic studies in steatorrhea of various etiologies is FALSE?

A. Chronic pancreatitis: D-Xylulose test is normal, Schilling test is abnormal, duodenal biopsy is normal.
B. Bacterial overgrowth syndrome: D-Xylulose test is normal, Schilling test is abnormal, duodenal biopsy is normal.
C. Celiac disease: D-Xylulose test is decreased, Schilling test is normal, duodenal biopsy shows absent villi.
D. Intestinal lymphangiectasia: D-Xylulose test is abnormal, Schilling test is normal, duodenal biopsy shows dilated lymphatics. (Correct Answer)

Explanation: This question tests your ability to differentiate between **maldigestion** (pancreatic/luminal issues) and **malabsorption** (mucosal/structural issues) using diagnostic markers [2]. ### **Why Option D is the Correct (False) Statement** In **Intestinal Lymphangiectasia**, the primary defect is the obstruction of lymphatic drainage, leading to the leakage of chyle and proteins into the gut [3]. However, the **intestinal mucosa (enterocytes) remains intact**. Since the **D-Xylose test** (often referred to as D-Xylulose in older texts) measures the functional integrity of the proximal small bowel mucosa, it remains **normal** in this condition. The statement incorrectly labels it as abnormal. ### **Analysis of Other Options** * **Option A (Chronic Pancreatitis):** This is a maldigestion problem [2]. D-Xylose is normal because the mucosa is healthy. The **Schilling test is abnormal** because pancreatic enzymes are required to cleave R-binder from Vitamin B12 to allow binding to Intrinsic Factor. * **Option B (Bacterial Overgrowth):** Bacteria deconjugate bile salts and compete for B12, making the **Schilling test abnormal** [1]. However, they do not typically destroy the mucosa or metabolize D-Xylose significantly enough to make the test abnormal (though mild decreases can occur, it is classically considered normal compared to Celiac). * **Option C (Celiac Disease):** This is a classic mucosal disease [3]. Villous atrophy leads to a **decreased D-Xylose test** and characteristic biopsy findings (absent villi, crypt hyperplasia). ### **NEET-PG High-Yield Pearls** * **D-Xylose Test:** Best initial test to differentiate mucosal disease (Abnormal) from pancreatic insufficiency (Normal). * **Schilling Test:** Historically used for B12 malabsorption; remember that it is abnormal in both Pernicious Anemia and Chronic Pancreatitis (for different reasons). * **Gold Standard for Steatorrhea:** 72-hour fecal fat estimation (>7g/day is diagnostic). * **Sudan III Staining:** Best rapid screening test for fecal fat.

Question 322: Which diagnostic evaluation is most sensitive for achalasia cardia?

A. Barium swallow
B. Esophageal manometry (Correct Answer)
C. Upper GI endoscopy
D. Chest X-ray

Explanation: **Explanation:** **Esophageal Manometry** is the **Gold Standard** and the most sensitive diagnostic tool for achalasia cardia [1]. The pathophysiology involves the failure of the Lower Esophageal Sphincter (LES) to relax and the absence of progressive peristalsis in the distal esophagus [1]. Manometry is the only test that directly measures these pressure changes and motor patterns, allowing for a definitive diagnosis even in early stages when structural changes are not yet visible on imaging [2]. **Why other options are incorrect:** * **Barium Swallow:** While it shows the classic "Bird’s beak" appearance (tapering of the distal esophagus), it is less sensitive than manometry, especially in early achalasia [2]. It is useful for assessing structural anatomy and esophageal dilation. * **Upper GI Endoscopy:** This is primarily used to **rule out pseudoachalasia** (malignancy at the GE junction) [2]. While it may show retained food or resistance at the LES (the "pop" sign), it cannot confirm the functional motility disorder. * **Chest X-ray:** This is a non-specific screening tool. It may show a widened mediastinum, an air-fluid level in the esophagus, or the absence of a gastric air bubble, but it is not diagnostic. **High-Yield Clinical Pearls for NEET-PG:** * **Chicago Classification:** Used to categorize achalasia into three types based on manometry (Type II is the most common and has the best prognosis) [2]. * **Key Manometric Findings:** 1) Incomplete LES relaxation (Residual pressure >10 mmHg), 2) Aperistalsis of the esophageal body, 3) Elevated resting LES pressure (>45 mmHg). * **Treatment of Choice:** Laparoscopic Heller Myotomy with partial fundoplication is the surgical gold standard; Peroral Endoscopic Myotomy (POEM) is a modern endoscopic alternative.

Question 323: The complete Rockall scoring system in the setting of non-variceal upper GI bleeding correlates well with:

A. Morbidity
B. Mortality (Correct Answer)
C. Rebleeding
D. Cardiac failure

Explanation: The **Rockall Score** is a clinical prediction tool used to assess the prognosis of patients with non-variceal upper gastrointestinal bleeding (NVUGIB). It is divided into two components: the clinical (pre-endoscopic) score and the complete (post-endoscopic) score. [1] ### **Explanation of the Correct Answer** **B. Mortality:** The primary objective and most validated application of the complete Rockall score is to predict **mortality**. It utilizes parameters such as age, shock (pulse and blood pressure), comorbidities, endoscopic diagnosis, and stigmata of recent hemorrhage. [1] A score of <3 is associated with an excellent prognosis (low mortality), whereas a score >8 indicates a high risk of death. ### **Explanation of Incorrect Options** * **A. Morbidity:** While a high score implies a sicker patient, the Rockall score is specifically validated as a prognostic tool for death rather than general morbidity. * **C. Rebleeding:** Although the Rockall score does have some correlation with the risk of rebleeding, it is significantly **less accurate** at predicting rebleeding compared to its ability to predict mortality. For predicting rebleeding, the **Forrest Classification** is the gold standard. * **D. Cardiac failure:** While "heart failure" is one of the comorbidities factored into the score, the score itself does not correlate with the development or severity of cardiac failure. ### **High-Yield Clinical Pearls for NEET-PG** * **Components of Rockall Score:** Age, Shock, Comorbidity, Diagnosis, and Endoscopic findings (Stigmata of hemorrhage). [1] * **Rockall vs. Blatchford:** The **Glasgow-Blatchford Score (GBS)** is superior for predicting the need for **clinical intervention** (transfusion or surgery) and is used *before* endoscopy. [1] The **Rockall Score** is used *after* endoscopy to predict **mortality**. * **Low-risk Rockall:** A score of **0–2** is considered low risk, often allowing for early discharge.

Question 324: Autoimmune hepatitis type I is characterized by the presence of all of the following antibodies except:

A. Antinuclear antibodies (ANA)
B. Anti-smooth muscle antibodies (SMA)
C. Anti-liver kidney microsome type 1 (Anti-LKM-1) antibodies (Correct Answer)
D. None of the above

Explanation: **Explanation:** Autoimmune Hepatitis (AIH) is a chronic inflammatory liver disease classified into two main types based on the specific circulating autoantibodies present [1]. **Why Option C is the correct answer:** **Anti-LKM-1 antibodies** are the hallmark of **Type II Autoimmune Hepatitis**, not Type I [1]. Type II AIH typically affects children and adolescents, follows a more aggressive clinical course, and is often associated with other autoimmune conditions like Type 1 Diabetes or Vitiligo. **Analysis of incorrect options:** * **Option A (ANA):** Antinuclear antibodies are the most common markers for **Type I AIH** [1]. They are found in approximately 75% of patients. * **Option B (SMA):** Anti-smooth muscle antibodies (specifically directed against F-actin) are highly characteristic of **Type I AIH**. Type I is the most common form globally (80% of cases) and typically affects young to middle-aged women [1]. **High-Yield Clinical Pearls for NEET-PG:** * **Type I AIH:** Characterized by **ANA** and/or **SMA** [1]. It has a bimodal age distribution (10–20 years and 45–70 years). * **Type II AIH:** Characterized by **Anti-LKM-1** and/or **Anti-Liver Cytosol type 1 (Anti-LC1)** antibodies. * **Hypergammaglobulinemia:** A classic laboratory finding in AIH is a selective elevation of **IgG levels** [1]. * **Histology:** The characteristic pathological feature is **Interface Hepatitis** (piecemeal necrosis) with a dense plasma cell infiltrate [1]. * **Treatment:** The mainstay of therapy is corticosteroids (Prednisolone) alone or in combination with Azathioprine [1].

Question 325: What is the most common symptom of primary biliary cirrhosis?

A. Pruritus (Correct Answer)
B. Abdominal pain
C. Jaundice
D. Bleeding

Explanation: **Explanation:** **Primary Biliary Cholangitis (PBC)**, formerly known as Primary Biliary Cirrhosis, is a chronic autoimmune cholestatic liver disease characterized by the destruction of small intrahepatic bile ducts [1]. **Why Pruritus is the correct answer:** Pruritus (itching) is the **most common presenting symptom** of PBC, occurring in approximately 50–70% of patients [1]. It often precedes the onset of jaundice by months or years [1]. While the exact pathogenesis is debated, it is believed to be caused by the accumulation of pruritogens (such as bile acids, endogenous opioids, or lysophosphatidic acid) in the skin due to cholestasis. It is typically worse at night and in warm weather. **Analysis of Incorrect Options:** * **B. Abdominal pain:** While some patients may experience vague right upper quadrant discomfort, it is not a hallmark or the most common symptom [1]. * **C. Jaundice:** This is a late-stage finding [1]. Its appearance usually signifies advanced ductal destruction and carries a poor prognostic implication. * **D. Bleeding:** Variceal bleeding or easy bruising (due to Vitamin K malabsorption) occurs only in the advanced cirrhotic stage of the disease. **NEET-PG High-Yield Pearls:** * **Demographics:** Classically affects middle-aged women (9:1 female-to-male ratio) [1]. * **Most Common Initial Symptom:** Fatigue (often reported alongside or before pruritus) [1]. * **Diagnostic Gold Standard:** **Anti-Mitochondrial Antibody (AMA)** is positive in >95% of cases (highly specific) [1]. * **Biochemical Marker:** Disproportionate elevation of **Alkaline Phosphatase (ALP)**. * **Treatment of Choice:** Ursodeoxycholic acid (UDCA) slows disease progression. * **Associated Conditions:** Frequently associated with other autoimmune diseases like Sjögren’s syndrome and Hashimoto’s thyroiditis [1].

Question 326: A 66-year-old woman with a history of chronic alcohol abuse has had headaches and nausea for the past 4 days. She has become increasingly obtunded. On physical examination, she has right upper quadrant tenderness, tachycardia, tachypnea, and hypotension. Laboratory studies show serum AST of 475 U/L, ALT of 509 U/L, alkaline phosphatase of 23 U/L, total bilirubin of 0.9 mg/dL, albumin of 3.8 g/dL, and total protein of 6.1 g/dL. She is treated with N-acetylcysteine. Which of the following drugs has she most likely ingested in excess?

A. Acetaminophen (Correct Answer)
B. Aspirin
C. Ibuprofen
D. Meperidine

Explanation: ### Explanation **Correct Answer: A. Acetaminophen** The clinical presentation of acute liver failure (obtundation, RUQ tenderness, hypotension) combined with the specific treatment—**N-acetylcysteine (NAC)**—is pathognomonic for **Acetaminophen (Paracetamol) toxicity**. In this patient, the key diagnostic clue is the **AST and ALT levels**. While chronic alcoholics typically have an AST:ALT ratio > 2:1 with values rarely exceeding 300 U/L, acetaminophen toxicity in the setting of chronic alcohol use causes **"hypertransaminasemia"** (often >3000 U/L, though levels are rising here). Alcohol induces the **CYP2E1 enzyme**, which accelerates the conversion of acetaminophen into the toxic metabolite **NAPQI**, depleting glutathione stores and causing centrilobular necrosis. NAC acts as a glutathione precursor/substitute to detoxify NAPQI. **Why Incorrect Options are Wrong:** * **B. Aspirin:** Toxicity typically presents with respiratory alkalosis, metabolic acidosis, tinnitus, and hyperthermia, but not acute fulminant hepatic failure. * **C. Ibuprofen:** Overdose usually causes GI upset, renal impairment, or CNS depression, but is not typically hepatotoxic. * **D. Meperidine:** An opioid that can cause respiratory depression and seizures (due to the metabolite normeperidine), but does not cause acute hepatitis or respond to NAC. **High-Yield Clinical Pearls for NEET-PG:** * **Rumack-Matthew Nomogram:** Used to predict hepatotoxicity after a single acute ingestion (not applicable in chronic or late presentations). * **The "Alcohol-Acetaminophen Syndrome":** Chronic alcoholics are at risk of severe hepatotoxicity even with "therapeutic" doses (2–4g) due to CYP2E1 induction and low baseline glutathione. * **NAC Timing:** Most effective if given within 8 hours of ingestion, but should be administered in any case of suspected toxicity or liver failure. * **Lab Signature:** Acetaminophen toxicity is one of the few conditions that can push transaminases into the 5,000–10,000 U/L range.

Question 327: Which of the following is NOT a hallmark of celiac sprue?

A. It is a gluten-sensitive enteropathy.
B. The most sensitive test is the presence of IgA antibodies to tissue transglutaminase.
C. It is diagnosed on the basis of a small intestinal biopsy.
D. It may be associated with diabetes insipidus. (Correct Answer)

Explanation: ### Explanation **Celiac Disease (Gluten-Sensitive Enteropathy)** is an immune-mediated inflammatory disorder of the small intestine triggered by the ingestion of prolamins (gluten) in genetically predisposed individuals (HLA-DQ2/DQ8). **Why Option D is the Correct Answer (The "NOT" hallmark):** Celiac disease is strongly associated with **autoimmune** conditions, most notably **Type 1 Diabetes Mellitus** (up to 10% of patients), autoimmune thyroiditis, and dermatitis herpetiformis. It is **not** associated with **Diabetes Insipidus**, which is a disorder of water metabolism related to Antidiuretic Hormone (ADH) deficiency or resistance. **Analysis of Incorrect Options:** * **Option A:** This is a hallmark. Celiac sprue is defined as a permanent intolerance to gluten (found in wheat, barley, and rye), leading to mucosal inflammation and villous atrophy. * **Option B:** This is a hallmark. **IgA tissue transglutaminase (tTG) antibody** is the preferred screening test due to its high sensitivity and specificity (>95%). (Note: IgA endomysial antibody is more specific but less sensitive). * **Option C:** This is the **gold standard** for diagnosis. Biopsy (usually from the second part of the duodenum) classically shows villous atrophy, crypt hyperplasia, and increased intraepithelial lymphocytes (Marsh Criteria). **High-Yield Clinical Pearls for NEET-PG:** * **Dermatitis Herpetiformis:** The pathognomonic skin manifestation (itchy vesicles on elbows/knees); biopsy shows granular IgA deposits in dermal papillae. * **Malignancy Risk:** Increased risk of **Enteropathy-associated T-cell lymphoma (EATL)** and small bowel adenocarcinoma. * **Deficiencies:** Often presents with iron-deficiency anemia (refractory to oral iron) and Vitamin D/Calcium deficiency. * **Treatment:** Strict lifelong **Gluten-Free Diet (GFD)**. Safe grains include Rice, Maize (Corn), and Millets.

Question 328: Anti-LKM antibodies are found in which condition?

A. Inflammatory myopathies
B. Systemic lupus erythematosus (SLE)
C. Autoimmune hepatitis (Correct Answer)
D. CREST syndrome

Explanation: Autoimmune Hepatitis (AIH) is a chronic inflammatory liver disease characterized by the presence of specific autoantibodies [1]. Anti-LKM-1 (Liver-Kidney Microsome type 1) antibodies are the hallmark of Type 2 Autoimmune Hepatitis, which typically affects children and adolescents. These antibodies are directed against the enzyme Cytochrome P450 2D6. Analysis of Options: * Autoimmune Hepatitis (Correct): AIH is classified into two types. Type 1 is associated with Anti-Smooth Muscle Antibodies (ASMA) and ANA. Type 2 is associated with Anti-LKM-1 and Anti-LC1 (Liver Cytosol type 1) antibodies [1]. * Inflammatory Myopathies: These (e.g., Dermatomyositis/Polymyositis) are associated with Anti-Jo-1, Anti-Mi-2, and Anti-SRP antibodies. * Systemic Lupus Erythematosus (SLE): Characterized by Anti-dsDNA (specific) and Anti-Smith antibodies. * CREST Syndrome: A limited form of Systemic Sclerosis characterized by Anti-Centromere antibodies. High-Yield Clinical Pearls for NEET-PG: * Type 1 AIH: Most common; seen in adults; markers: ASMA and ANA. * Type 2 AIH: More severe; seen in children; markers: Anti-LKM-1. * Hypergammaglobulinemia: A classic biochemical finding in AIH (specifically elevated IgG) [1]. * Interface Hepatitis: The characteristic histological finding on liver biopsy (piecemeal necrosis) [1]. * Treatment: Prednisolone and Azathioprine are the mainstays of therapy [1].

Question 329: Which extra-intestinal symptom of IBD worsens with exacerbation of disease activity?

A. Toxic megacolon
B. Arthritis (Correct Answer)
C. Primary sclerosing cholangitis
D. Uveitis

Explanation: The extra-intestinal manifestations (EIMs) of Inflammatory Bowel Disease (IBD) are categorized based on whether their clinical course parallels the activity of the underlying bowel inflammation. **Why Arthritis is Correct:** Peripheral arthritis (Type 1) is the most common EIM of IBD. **Type 1 peripheral arthritis** involves large joints (pauciarticular) and characteristically **parallels the activity of the intestinal disease** [1]. When the colitis flares, the joint pain and swelling worsen; conversely, medical or surgical treatment of the bowel inflammation typically leads to resolution of the arthritis. **Analysis of Incorrect Options:** * **Toxic Megacolon (A):** This is a life-threatening **intestinal complication** of IBD (specifically Ulcerative Colitis), not an extra-intestinal symptom. * **Primary Sclerosing Cholangitis (C):** PSC is strongly associated with UC, but its progression is **independent** of bowel activity. Colectomy or remission of colitis does not improve the course of PSC. * **Uveitis (D):** While ocular manifestations like episcleritis parallel bowel activity, **uveitis** often follows an **independent** course and may persist even when the bowel disease is quiescent. **High-Yield Clinical Pearls for NEET-PG:** * **Parallels Bowel Activity:** Type 1 Peripheral Arthritis, Episcleritis, Erythema Nodosum, and Aphthous ulcers. * **Independent of Bowel Activity:** Ankylosing Spondylitis, Sacroiliitis [1], Uveitis, Primary Sclerosing Cholangitis (PSC), and Pyoderma Gangrenosum. * **HLA Association:** Ankylosing spondylitis in IBD is strongly associated with **HLA-B27** [2]. * **Most common EIM overall:** Arthritis.

Question 330: Which of the following is more commonly associated with acute liver failure?

A. Hepatitis A
B. Hepatitis B (Correct Answer)
C. Hepatitis C
D. Hepatitis D

Explanation: Hepatitis B (HBV) is the most common viral cause of Acute Liver Failure (ALF) worldwide, particularly in endemic regions like Asia and Africa. While most HBV infections in adults are self-limiting, approximately 1% of cases progress to fulminant hepatic failure due to an intense, immune-mediated destruction of hepatocytes [1]. Analysis of Options: * Hepatitis B (Correct): It is the leading viral cause of ALF [4]. The risk of fulminant failure increases significantly with coinfection or superinfection with Hepatitis D, or in cases of reactivation (e.g., during chemotherapy) [3]. * Hepatitis A: While HAV can cause ALF, it is much less frequent than HBV [4]. It typically follows a benign, self-limiting course, especially in children [2]. * Hepatitis C: HCV is a major cause of chronic liver disease and cirrhosis but is extremely rare as a cause of acute liver failure [4]. It typically does not cause a robust enough acute immune response to trigger fulminant necrosis. * Hepatitis D: HDV requires the presence of HBV to replicate. While it increases the severity of HBV infection, as a standalone option, HBV remains the primary driver and the more common epidemiological answer [4]. High-Yield Clinical Pearls for NEET-PG: * Most common cause of ALF overall: In developed countries, it is Acetaminophen (Paracetamol) toxicity; in developing countries, it is Viral Hepatitis (HBV/HEV). * Pregnancy & ALF: Hepatitis E (HEV) is the most common cause of ALF in pregnant women, carrying a high mortality rate (~20%). * Definition of ALF: Development of hepatic encephalopathy and coagulopathy (INR >1.5) within 26 weeks of the onset of symptoms in a patient without pre-existing cirrhosis [1].

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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