Gastroenterology — MCQs

Gastroenterology Indian Medical PG Practice Questions and MCQs

Question 1041: Which is not a component of Ranson's criteria for acute pancreatitis?

A. Serum lipase (Correct Answer)
B. Age
C. Base deficit
D. Blood glucose

Explanation: ***Serum lipase*** - **Serum lipase** is not a component of Ranson's criteria. While it is a crucial diagnostic marker for acute pancreatitis, Ranson's criteria focus on other clinical and laboratory values for predicting severity. - The criteria were developed before widespread availability and use of lipase as a primary diagnostic marker for pancreatitis. *Age* - **Age** is a component of Ranson's criteria, specifically "Age > 55 years" for admission and initial assessment [1]. - Older age is associated with increased severity and mortality in acute pancreatitis due to decreased physiologic reserve [1]. *Base deficit* - **Base deficit** is a component of Ranson's criteria, specifically "Base deficit > 4 mEq/L" after 48 hours. - A significant base deficit indicates **metabolic acidosis**, which is a marker of severe systemic inflammation and organ dysfunction in acute pancreatitis. *Blood glucose* - **Blood glucose** is a component of Ranson's criteria, specifically "Blood glucose > 200 mg/dL (11.1 mmol/L)" for admission and initial assessment. - Elevated blood glucose can reflect the severity of pancreatic inflammation and insult to the **islet cells**, or systemic stress response.

Question 1042: In acute pancreatitis, organ failure beyond 48 hours indicates:

A. Critical pancreatitis
B. Mild pancreatitis
C. Moderately severe
D. Severe pancreatitis (Correct Answer)

Explanation: ***Severe pancreatitis*** - **Severe pancreatitis** is defined by the presence of **persistent organ failure**, meaning organ failure lasting longer than 48 hours [1]. - This classification is crucial for predicting prognosis and guiding management, as severe pancreatitis carries a significantly higher risk of complications and mortality [1]. *Critical pancreatitis* - "Critical pancreatitis" is not a standard, recognized classification term in the revised Atlanta Classification for acute pancreatitis. - The classification primarily focuses on differentiating between mild, moderately severe, and severe forms based on local and systemic complications, particularly organ failure [1]. *Mild pancreatitis* - **Mild pancreatitis** is characterized by the absence of organ failure and local or systemic complications [1]. - Patients with mild pancreatitis typically have a benign course and recover without significant morbidity. *Moderately severe* - **Moderately severe pancreatitis** is defined by the presence of **transient organ failure** (resolves within 48 hours) or local complications (e.g., fluid collections, necrosis) without persistent organ failure [1]. - While more serious than mild pancreatitis, it does not involve the sustained organ dysfunction seen in severe cases.

Question 1043: A 60-year-old presents with hematochezia, Hb 7g/dl. Upper GI endoscopy normal. Next investigation?

A. Capsule endoscopy
B. CT angiogram
C. Push enteroscopy
D. Colonoscopy (Correct Answer)

Explanation: ***Colonoscopy*** - **Hematochezia** (bright red blood per rectum) typically indicates **lower GI bleeding**, most commonly from the **colon or rectum**. After normal upper GI endoscopy, colonoscopy is the standard next investigation [1]. - Colonoscopy allows both **diagnostic visualization** of the entire colon and **therapeutic intervention** (e.g., **polypectomy**, **coagulation**) for bleeding lesions like **diverticular bleeding**, **angiodysplasia**, or **colorectal malignancy** [3]. *Push enteroscopy* - Push enteroscopy is indicated for **obscure GI bleeding** only after **both upper endoscopy and colonoscopy** have been performed and found normal [2]. - It evaluates the **proximal small bowel** but would not be the immediate next step when hematochezia suggests a **colonic source** that hasn't been evaluated yet. *Capsule endoscopy* - Capsule endoscopy is reserved for **obscure GI bleeding** after negative upper and lower endoscopy, primarily to evaluate the **entire small bowel** [2]. - It provides only **diagnostic information** without therapeutic capability and would be inappropriate before evaluating the colon in a patient with hematochezia [1]. *CT angiogram* - CT angiogram is useful for **rapid active arterial bleeding** (>0.5-1.0 mL/min) when **contrast extravasation** can be detected, or when endoscopy is not feasible. - It's typically reserved for **hemodynamically unstable** patients or when initial endoscopic evaluation fails to identify the bleeding source.

Question 1044: Assertion: Beta blockers improve survival in cirrhosis with varices. Reason: They reduce cardiac output and splanchnic blood flow.

A. Both A & R true, R doesn't explain A
B. Both A & R true, R explains A (Correct Answer)
C. A true R false
D. A false R true

Explanation: ***Both A & R true, R explains A*** - **Beta blockers** improve survival in patients with **cirrhosis and varices** by reducing the risk of **variceal bleeding**, a major cause of mortality [1]. - This is achieved by lowering **portal pressure** primarily through reducing **cardiac output** (beta-1 blockade) and causing **splanchnic vasoconstriction** (beta-2 blockade), thereby decreasing splanchnic blood flow. *Both A & R true, R doesn't explain A* - The reasoning provided (reduction in cardiac output and splanchnic blood flow) directly explains the mechanism by which **beta blockers** reduce **portal pressure** and subsequently prevent **variceal bleeding**, thus improving survival [1]. - Therefore, the reason *does* explain the assertion. *A true R false* - The assertion that **beta blockers** improve survival in cirrhosis with varices is **true**. - The reason—that they reduce cardiac output and splanchnic blood flow—is also **true** and describes their key mechanism of action in this context. *A false R true* - The assertion is **true**: non-selective **beta blockers** are a cornerstone in the primary and secondary prophylaxis of **variceal hemorrhage** in **cirrhosis**, improving survival. - The reason is also **true**, as these mechanisms are well-established pharmacological effects of **beta blockers** leading to reduced **portal hypertension** [1].

Question 1045: In a patient with cirrhosis, which finding indicates worst prognosis according to Child-Pugh score?

A. PT prolonged by 4 seconds
B. Grade 3 encephalopathy (Correct Answer)
C. Serum albumin 2.8 g/dL
D. Moderate ascites

Explanation: ***Grade 3 encephalopathy*** - According to the **Child-Pugh score**, **grade 3 or 4 encephalopathy** is assigned the highest score (3 points) in the encephalopathy category, indicating the severest form and poorest prognosis [1]. - Higher grades of encephalopathy reflect significant **neurological dysfunction** due to impaired liver detoxification [1]. *PT prolonged by 4 seconds* - A **prothrombin time (PT)** prolongation of 4-6 seconds beyond control receives 2 points, while PT prolonged >6 seconds beyond control receives 3 points in the Child-Pugh score [1]. - While significant, a 4-second prolongation (2 points) is less severe than grade 3 encephalopathy (3 points). *Serum albumin 2.8 g/dL* - A **serum albumin level** between 2.8 and 3.5 g/dL receives 2 points in the Child-Pugh score [1]. - This value indicates moderate liver dysfunction but is not the highest score achievable within the Child-Pugh system. *Moderate ascites* - **Moderate ascites** that is responsive to diuretics receives 2 points in the Child-Pugh score [1]. - **Refractory ascites** receives 3 points, but "moderate ascites" alone typically implies a milder form with a better prognosis than grade 3 encephalopathy due to its lower score [1].

Question 1046: A patient with cirrhosis develops spontaneous bacterial peritonitis. Which factor most strongly predicts poor prognosis?

A. Ascitic protein >2.5 g/dL
B. Total count >25000/mm3
C. Positive blood culture
D. Serum creatinine >2 mg/dL (Correct Answer)

Explanation: ***Serum creatinine >2 mg/dL*** - Elevated **serum creatinine** in the context of spontaneous bacterial peritonitis (SBP) indicates **renal impairment** or **acute kidney injury**, which is a strong predictor of poor prognosis and increased mortality [1]. - Renal dysfunction significantly complicates the management of cirrhosis and SBP, leading to higher rates of complications and reduced survival [1]. *Ascitic protein >2.5 g/dL* - A low ascitic protein level (<1 g/dL) is actually a risk factor for developing SBP, as it suggests a compromised immune defense in the ascitic fluid. - A protein level >2.5 g/dL might indicate a secondary bacterial peritonitis or other causes of ascites, but it is not typically a predictor of poor prognosis in SBP itself [2]. *Total count >25000/mm3* - While a high total white blood cell count in ascitic fluid (specifically **polymorphonuclear (PMN) count >250 cells/mm3**) is diagnostic of SBP, an extremely high total count (like >25,000/mm3) is not the strongest predictor of *poor prognosis* compared to renal dysfunction. - It might suggest a more severe infection, but **renal compromise** has a greater impact on mortality. *Positive blood culture* - A positive blood culture in SBP indicates **bacteremia**, which is associated with a more severe infection and higher mortality rates than SBP without bacteremia. - However, **renal impairment** (serum creatinine >2 mg/dL) typically carries a *graver prognostic significance* as it reflects organ system failure beyond the infection itself [1].

Question 1047: Most specific serological marker for celiac disease?

A. Anti-gliadin antibody
B. Anti-reticulin antibody
C. Anti-tissue transglutaminase (Correct Answer)
D. Anti-endomysial antibody

Explanation: ***Anti-tissue transglutaminase*** - **Anti-tissue transglutaminase (tTG) antibodies**, especially the IgA class, are the **most sensitive and specific serological test** for diagnosing celiac disease. - They target the enzyme **tissue transglutaminase**, which deamidates gliadin peptides, making them more immunogenic. *Anti-gliadin antibody* - **Anti-gliadin antibodies (AGA)**, both IgA and IgG, were historically used but have **lower sensitivity and specificity** compared to newer markers. - Their primary role today is limited, particularly in children under 2 years old or in cases with IgA deficiency, where **IgG-AGA** might be considered. *Anti-reticulin antibody* - **Anti-reticulin antibodies (ARA)** are another serological marker for celiac disease, but they have **lower sensitivity and specificity** than anti-tTG and anti-endomysial antibodies. - Due to their lower diagnostic accuracy, they are **rarely used** in routine clinical practice for celiac disease screening. *Anti-endomysial antibody* - **Anti-endomysial antibodies (EMA)** are highly specific for celiac disease, with nearly 100% specificity, but they are **less sensitive** than anti-tTG antibodies. - The test is **operator-dependent** and typically performed by indirect immunofluorescence on primate esophagus, making it more expensive and less readily available than anti-tTG.

Question 1048: A chronic alcoholic patient came to emergency with severe pain in epigastrium and multiple episodes of vomiting. On examination, guarding was present in upper epigastrium. Chest X-ray was normal. What is the next best step?

A. CECT
B. Alcohol breath test
C. Serum lipase (Correct Answer)
D. Upper GI endoscopy

Explanation: ***Serum lipase*** - The patient's presentation with acute epigastric pain, vomiting, guarding, and a history of chronic alcoholism strongly suggests **acute pancreatitis** [1]. - **Serum lipase** is highly sensitive and specific for diagnosing acute pancreatitis, with levels typically elevated to at least three times the upper limit of normal. *CECT* - While **CECT (Contrast-Enhanced Computed Tomography)** is excellent for assessing the severity and complications of pancreatitis, it is generally not the initial diagnostic test for suspected acute pancreatitis [1]. - CT scans are usually performed if the diagnosis is unclear or if complications like **necrosis** or **fluid collections** are suspected after initial laboratory tests. *Alcohol breath test* - An **alcohol breath test** would confirm recent alcohol consumption but does not directly diagnose the cause of the patient's acute abdominal pain [2]. - While chronic alcoholism is a risk factor for pancreatitis, this test does not provide specific information about the underlying medical emergency. *Upper GI endoscopy* - **Upper GI endoscopy** is primarily used to evaluate conditions affecting the esophagus, stomach, and duodenum, such as **ulcers** or **gastritis**. - It would not be the initial diagnostic step for suspected pancreatitis, as it does not directly visualize the pancreas and carries risks in an acutely ill patient.

Question 1049: A 30-year-old female presents with jaundice and itching. MRCP reveals stricturing of the intrahepatic bile ducts with beading. What is the most likely diagnosis?

A. Choledocholithiasis
B. Pancreatic cancer
C. Primary sclerosing cholangitis (Correct Answer)
D. Cholangiocarcinoma

Explanation: ***Primary sclerosing cholangitis*** - The classic imaging finding of **stricturing** and **beading** in the **intrahepatic bile ducts** on MRCP is highly characteristic of **primary sclerosing cholangitis (PSC)** [1]. - **Jaundice** and **itching** are common symptoms of cholestasis, which occurs due to progressive fibrosis and inflammation of the bile ducts in PSC [2]. *Choledocholithiasis* - This condition involves **stones in the common bile duct**, which would typically appear as filling defects on MRCP rather than diffuse stricturing and beading. - While it can cause jaundice and itching, it does not explain the characteristic diffuse bile duct changes seen. *Pancreatic cancer* - Pancreatic cancer typically causes **distal common bile duct obstruction**, which would appear as an abrupt cutoff or stricture, often with upstream dilation, rather than widespread intrahepatic stricturing and beading. - Symptoms like **unexplained weight loss** and **new-onset diabetes** are more typical. *Cholangiocarcinoma* - While cholangiocarcinoma is a malignancy of the bile ducts, it usually presents as a **focal stricture** or a **mass lesion** within the bile duct system. - The widespread "beading" pattern points more towards an inflammatory-fibrotic process like PSC, although cholangiocarcinoma can sometimes develop in the context of PSC.

Question 1050: All of the following are risk factors for gastric cancer except?

A. Diet high in pickled vegetables
B. Smoking
C. Helicobacter pylori infection
D. Duodenal ulcer (Correct Answer)

Explanation: ***Duodenal ulcer*** - A history of **duodenal ulcers** is generally protective against gastric cancer, possibly due to the increased acid production in the duodenum or differences in the distribution of *H. pylori* strains [1]. - While *H. pylori* can cause both duodenal ulcers and gastric cancer, specific strains associated with duodenal ulcers may be less virulent in terms of oncogenic potential for the stomach [1]. *Diet high in pickled vegetables* - Diets high in **salted and pickled foods** are associated with an increased risk of gastric cancer. - These foods often contain **nitrosamines** and other carcinogenic compounds that can directly damage gastric mucosa. *Smoking* - **Smoking** is a well-established and significant risk factor for gastric cancer, increasing the risk by 1.5 to 2.5 times compared to non-smokers. - Carcinogens in tobacco smoke can reach the stomach mucosa, promoting cellular damage and malignant transformation. *Helicobacter pylori infection* - **Chronic *Helicobacter pylori* infection** is the strongest known risk factor for gastric cancer, particularly for the intestinal type [2]. - It causes chronic inflammation and atrophy of the gastric mucosa, leading to a cascade known as Correa's pathway (chronic gastritis → atrophic gastritis → intestinal metaplasia → dysplasia → carcinoma) [2].

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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