Gastroenterology Practice Questions

Q: Hepatic encephalopathy may be precipitated by all of the following except?

Hyperkalemia. **Explanation:** Hepatic Encephalopathy (HE) is a reversible neuropsychiatric syndrome caused by liver failure or portosystemic shunting, leading to the accumulation of neurotoxins (primarily ammonia) [1]. It is typically triggered by specific precipitating factors that either increase ammonia production or decrease its clearance. **Why Hyperkalemia is the Correct Answer:** **Hypokalemia**, not hyperkalemia, precipitates HE. Low serum potassium levels induce intracellular acidosis. To compensate, the kidneys exchange intracellular $H^+$ for extracellular $K^+$. This increases renal ammonia production (ammoniogenesis) and promotes the conversion of ammonium ($NH_4^+$) to ammonia ($NH_3$), which easily crosses the blood-brain barrier, worsening encephalopathy. **Analysis of Other Options:** * **Anemia:** Acute blood loss (especially GI bleeding) is a major trigger. Blood in the gut provides a massive protein load, which is broken down by bacteria into ammonia. * **Barbiturates:** Sedatives, hypnotics, and narcotics have a prolonged half-life in liver failure. They directly depress the CNS and can mask or worsen the symptoms of HE. * **Hypothyroidism:** While less common, hypothyroidism can precipitate HE by slowing gut motility (leading to constipation and increased ammonia absorption) and reducing the metabolic clearance of toxins. **NEET-PG High-Yield Pearls:** * **Most common trigger:** Infection (e.g., SBP), GI bleed, or Diuretic overuse. * **Metabolic Triggers:** Hypokalemia, Alkalosis, Dehydration, and Azotemia. * **Treatment Gold Standard:** Lactulose (converts $NH_3$ to non-absorbable $NH_4^+$) and Rifaximin (reduces ammonia-producing gut flora). * **Asterixis (Flapping tremors):** A classic sign, but not pathognomonic (also seen in uremia and $CO_2$ narcosis).

Q: Which of the following statements is true regarding ulcerative colitis?

It is a premalignant condition.. ### Explanation **1. Why Option A is Correct:** Ulcerative Colitis (UC) is considered a **premalignant condition**. Chronic inflammation leads to a "dysplasia-carcinoma sequence." The risk of developing **Colorectal Carcinoma (CRC)** increases significantly with the duration of the disease (usually after 8–10 years) and the extent of involvement (pancolitis carries a higher risk than proctitis) [1]. Regular surveillance colonoscopy with biopsies is mandatory for these patients. **2. Why Other Options are Incorrect:** * **Option B:** **Cobblestone appearance** is a hallmark of **Crohn’s Disease**, caused by deep longitudinal and transverse ulcers separated by areas of edematous but intact mucosa. In UC, the mucosa is typically granular and friable. * **Option C:** While **pseudopolyps** (inflammatory polyps formed by regenerating islands of mucosa) are very common in UC, they are **not exclusive** to it; they can also be seen in Crohn’s disease or any severe inflammatory insult to the colon [1]. * **Option D:** UC is characterized by **rectal involvement in >95% of cases**. It starts in the rectum (proctitis) and spreads proximally in a **continuous, symmetrical fashion** without "skip lesions" [1]. **3. High-Yield Clinical Pearls for NEET-PG:** * **Depth of Involvement:** UC involves only the **mucosa and submucosa** (Crohn’s is transmural) [1]. * **Lead Pipe Appearance:** Loss of haustrations on barium enema due to chronic scarring. * **Smoking Paradox:** Smoking is **protective** in UC (it may worsen Crohn’s). * **Extra-intestinal Manifestation:** **Primary Sclerosing Cholangitis (PSC)** is more strongly associated with UC than Crohn’s. * **Microscopy:** Presence of **Crypt abscesses** (neutrophils in crypt lumens) [1].

Q: Amylase is raised in all conditions below except?

Serous cystadenoma of pancreas. **Explanation:** Serum amylase is a key biomarker in gastroenterology, primarily produced by the **pancreatic acinar cells** and the **salivary glands** [3]. Elevated levels occur when there is inflammation, ductal obstruction, or leakage from these tissues into the systemic circulation. **1. Why Serous Cystadenoma is the correct answer:** Serous cystadenoma is a **benign, slow-growing neoplastic lesion** of the pancreas. Unlike inflammatory conditions (pancreatitis) or complications like pseudocysts, these tumors do not typically cause significant destruction of acinar tissue or obstruction of the main pancreatic duct [1]. Therefore, they are generally **not associated with an increase in serum amylase levels**. **2. Analysis of Incorrect Options:** * **Parotitis (Option A):** The salivary glands produce the S-isoenzyme of amylase [3]. Inflammation of the parotid gland (e.g., Mumps) leads to the release of this enzyme into the blood, causing hyperamylasemia [2]. * **Pancreatic Pseudocyst (Option B):** A pseudocyst is a collection of pancreatic fluid rich in digestive enzymes. Persistent elevation of serum amylase following an episode of acute pancreatitis is a classic clinical sign suggesting the formation of a pseudocyst [2]. **3. NEET-PG High-Yield Pearls:** * **Macroamylasemia:** A condition where amylase binds to Immunoglobulins (IgA/IgG), becoming too large to be filtered by the kidney. Result: **High serum amylase but low urinary amylase.** * **Other causes of high amylase:** Ectopic pregnancy, intestinal perforation, and diabetic ketoacidosis (DKA). * **Lipase vs. Amylase:** Lipase is more specific for the pancreas and remains elevated longer than amylase (up to 7–14 days). * **Serous Cystadenoma:** Characteristically shows a **"sunburst" calcification** or central stellate scar on imaging [1].

Q: Which immunoglobulin level is specifically elevated in autoimmune pancreatitis?

IgG4. **Explanation:** **Autoimmune Pancreatitis (AIP)** is a distinct form of chronic pancreatitis characterized by a fibroinflammatory process. It is the pancreatic manifestation of **IgG4-related disease (IgG4-RD)**. **Why IgG4 is the correct answer:** Type 1 AIP (the most common form globally) is characterized by high serum levels of **IgG4** and dense infiltration of IgG4-positive plasma cells in the pancreatic tissue. Histologically, this presents as Lymphoplasmacytic Sclerosing Pancreatitis (LPSP). A serum IgG4 level >135 mg/dL is a key diagnostic marker and is part of the HISORt criteria used to diagnose the condition. **Analysis of Incorrect Options:** * **IgM:** Typically elevated in primary biliary cholangitis (PBC) or acute infections. It is not a marker for AIP. * **IgE:** Associated with Type 1 hypersensitivity reactions (allergies) and parasitic infections. While some AIP patients have peripheral eosinophilia, IgE is not the specific diagnostic marker. * **IgG2:** While IgG2 is the most abundant subclass in response to bacterial capsular polysaccharides, it has no specific association with autoimmune pancreatitis. **High-Yield Clinical Pearls for NEET-PG:** * **Classic Presentation:** Painless obstructive jaundice in an elderly male, often mimicking pancreatic cancer ("sausage-shaped" pancreas on CT). * **Treatment:** AIP is highly **steroid-responsive**, which helps differentiate it from pancreatic malignancy. * **Extrapancreatic manifestations:** Look for associated Sclerosing Cholangitis, Salivary gland involvement (Küttner's tumor), or Retroperitoneal fibrosis. * **Type 2 AIP:** Unlike Type 1, Type 2 is **not** associated with elevated IgG4 and is often linked to Inflammatory Bowel Disease (UC).

Q: When carcinoma of the stomach develops secondarily to pernicious anemia, in which region is it usually situated?

Fundus. The correct answer is **Fundus (Option D)**. **Pathophysiology:** Pernicious anemia is an autoimmune condition characterized by the presence of antibodies against gastric parietal cells and intrinsic factor [1]. This leads to **Type A Gastritis (Autoimmune Metaplastic Atrophic Gastritis)**. Since parietal cells are predominantly located in the **fundus and the body** of the stomach, these areas undergo significant mucosal atrophy and intestinal metaplasia [1]. This chronic inflammatory environment predisposes the tissue to adenocarcinoma. While both the body and fundus are affected, the fundus is the classic site cited for malignancies secondary to pernicious anemia in medical literature and competitive exams. **Analysis of Incorrect Options:** * **A & B (Prepyloric region and Pylorus):** These areas constitute the gastric antrum. Carcinomas associated with *H. pylori* infection (Type B Gastritis) typically occur here. In pernicious anemia, the antrum is usually spared because it lacks parietal cells [1]. * **C (Body):** While the body is affected by atrophic gastritis in pernicious anemia, the fundus is considered the more characteristic site for the development of these specific secondary carcinomas in the context of this disease. **NEET-PG High-Yield Pearls:** * **Type A Gastritis:** **A**utoimmune, **A**nemia (Pernicious), **A**chlorhydria, and involves the **A**ndrum-sparing (Fundus/Body) [1]. * **Type B Gastritis:** **B**acterial (*H. pylori*), involves the **B**ad part (Antrum). * **Risk:** Patients with pernicious anemia have a 3-fold increased risk of gastric adenocarcinoma and are also at risk for **Gastric Carcinoid tumors** (due to hypergastrinemia stimulating ECL cells). * **Marker:** Anti-parietal cell antibodies are sensitive; Anti-intrinsic factor antibodies are specific.

Q: The gold standard for the diagnosis of Wilson disease is:

Liver biopsy with quantitative copper assay. **Explanation:** Wilson disease is an autosomal recessive disorder caused by mutations in the *ATP7B* gene, leading to impaired biliary copper excretion and systemic copper accumulation [1]. **Why Option A is Correct:** The **Gold Standard** for diagnosis is a **liver biopsy with quantitative copper assay**. A hepatic copper concentration **>250 μg/g dry weight** is diagnostic. While other tests are used for screening, the direct measurement of copper content in the liver tissue remains the most definitive evidence of the disease's pathophysiology. **Why Other Options are Incorrect:** * **Option B:** Serum ceruloplasmin is typically low ( 100 μg/day) is an excellent screening tool and part of the diagnostic scoring system (Leipzig criteria), but it is not the "gold standard." * **Option D:** Copper staining (e.g., Rhodanine or Orcein) is often unreliable because copper deposition in the liver is **patchy**, especially in early stages [1]. A quantitative assay is far more accurate than visual staining. **High-Yield Clinical Pearls for NEET-PG:** * **Initial Screening Test:** Serum Ceruloplasmin (usually decreased). * **Most Sensitive Screening Test:** 24-hour urinary copper. * **Ocular Finding:** Kayser-Fleischer (KF) rings (copper deposition in Descemet’s membrane), best seen on slit-lamp exam. * **Hematology:** Coombs-negative hemolytic anemia is a classic presentation [1]. * **Treatment:** First-line is **Chelation therapy** (D-Penicillamine or Trientine). Oral Zinc is used for maintenance or asymptomatic patients.

Question 1

A 45-year-old patient presents with massive hematemesis. The patient is alert and hemodynamically stable. What is the next immediate step in management?

Accepted Answer

Position the patient in recovery position and protect the airway

Answer

Initiate blood transfusion

Answer

Start intravenous fluids

Answer

Perform urgent upper gastrointestinal endoscopy

Question 2

Hepatic encephalopathy may be precipitated by all of the following except?

Accepted Answer

Hyperkalemia

Answer

Anemia

Answer

Barbiturates

Answer

Hypothyroidism

Question 3

A 40-year-old male patient, a known smoker, presents with fever, fatigue, and complete aversion to cigarette smoking. On examination, he has icterus with an enlarged, tender liver. LFT shows Total bilirubin 17.5 mg%, Direct bilirubin 5.5 mg%, SGOT 700 IU, and SGPT 900 IU. What investigations will you perform to rule out acute viral hepatitis?

Accepted Answer

Hepatitis A antibody (Anti-HAV), Hepatitis B surface antigen (HBsAg), IgM antibody to Hepatitis B core antigen (IgM anti-HBc), Hepatitis C antibody (Anti-HCV)

Answer

Hepatitis B surface antigen (HBsAg), IgM antibody to Hepatitis B core antigen (IgM anti-HBc), Hepatitis C antibody (Anti-HCV), Hepatitis E antibody (Anti-HEV)

Answer

Hepatitis B antigen (HBAg), IgM antibody to Hepatitis B core antigen (IgM anti-HBc), Hepatitis D antibody (Anti-HDV), Hepatitis C antibody (Anti-HCV), Hepatitis E antibody (Anti-HEV)

Answer

Hepatitis A antibody (Anti-HAV), IgM antibody to Hepatitis B core antigen (IgM anti-HBc), Hepatitis C antibody (Anti-HCV), Hepatitis E antibody (Anti-HEV)

Question 4

Which of the following statements is true regarding ulcerative colitis?

Accepted Answer

It is a premalignant condition.

Answer

Cobblestone mucosa is a characteristic feature.

Answer

Pseudopolyps are seen exclusively in ulcerative colitis.

Answer

It rarely affects the rectum.

Question 5

Amylase is raised in all conditions below except?

Accepted Answer

Serous cystadenoma of pancreas

Answer

Parotitis

Answer

Pancreatic pseudocyst

Answer

None of the above

Question 6

Which immunoglobulin level is specifically elevated in autoimmune pancreatitis?

Accepted Answer

IgG4

Answer

IgM

Answer

IgE

Answer

IgG2

Question 7

Cholestatic jaundice is associated with all of the following, except:

Accepted Answer

A moderate to marked increase in SGOT

Answer

Predominantly conjugated hyperbilirubinemia

Answer

Minimal biochemical changes of parenchymal liver damage

Answer

A moderate to marked increase in serum alkaline phosphatase

Question 8

When carcinoma of the stomach develops secondarily to pernicious anemia, in which region is it usually situated?

Accepted Answer

Fundus

Answer

Prepyloric region

Answer

Pylorus

Answer

Body

Question 9

A patient presents with chronic small bowel diarrhea. A duodenal biopsy shows villous atrophy, and serological tests reveal positive anti-endomysial antibodies and IgA tissue transglutaminase (TTG) antibodies. What is the treatment of choice?

Accepted Answer

Gluten-free diet

Answer

Antibiotics

Answer

Loperamide

Answer

5-aminosalicylic acid (5-ASA)

Question 10

The gold standard for the diagnosis of Wilson disease is:

Accepted Answer

Liver biopsy with quantitative copper assay

Answer

Serum ceruloplasmin along with free copper estimation

Answer

24 hour urine copper quantification

Answer

Liver biopsy and copper staining

Gastroenterology — MCQs

Gastroenterology — MCQs

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