Gastroenterology — MCQs

Gastroenterology Indian Medical PG Practice Questions and MCQs

Question 1071: Which of the following findings on colonoscopy is most consistent with angiodysplasia?

A. Inflamed diverticula
B. Dilated submucosal veins (Correct Answer)
C. Mucosal ulcers
D. Mass lesion

Explanation: Dilated submucosal veins - **Angiodysplasia** is characterized by the presence of **dilated, tortuous submucosal venules and capillaries** that are prone to bleeding. - On colonoscopy, these lesions typically appear as small, flat, cherry-red spots or fern-like vascular patterns. *Inflamed diverticula* - **Diverticulitis** involves inflammation and infection of outpouchings in the colon wall, presenting with pain, fever, and leukocytosis. - Colonoscopy during acute diverticulitis is generally avoided due to the risk of perforation, and the findings would be localized inflammation, not dilated vessels indicative of angiodysplasia. *Mucosal ulcers* - **Mucosal ulcers** are breaks in the mucosal lining, often associated with inflammatory bowel disease, infections, or ischemia. - While ulcers can cause bleeding, they represent a different pathological process than the vascular malformations characteristic of angiodysplasia. *Mass lesion* - A **mass lesion** suggests a tumor, polyp, or other growth within the colon. - This finding is more indicative of a neoplastic process or a large inflammatory lesion, distinct from the small, flat vascular lesions of angiodysplasia.

Question 1072: How does portal hypertension contribute to the development of ascites?

A. Increased hydrostatic pressure in the portal system (Correct Answer)
B. Decreased oncotic pressure
C. Lymphatic obstruction
D. Increased cardiac output

Explanation: Increased hydrostatic pressure in the portal system - **Portal hypertension** directly leads to an increase in hydrostatic pressure within the **hepatic sinusoids** and splanchnic circulation [1]. - This elevated pressure forces fluid to leak from the **capillaries** into the peritoneal cavity, forming ascites, typically characterized by a high Serum-Ascites Albumin Gradient (SAAG) [2]. *Decreased oncotic pressure* - While **hypoalbuminemia**, which causes decreased oncotic pressure, is a significant contributor to ascites in **liver disease**, it is a *consequence* of liver dysfunction, not the primary mechanism of portal hypertension [3]. - Decreased oncotic pressure alone doesn't explain the initial fluid shift directly driven by increased vascular pressure within the portal system. *Lymphatic obstruction* - Although **lymphatic drainage** can be overwhelmed in severe **liver disease**, contributing to ascites, it is not the initial or primary mechanism by which **portal hypertension** leads to ascites formation. - The elevated hydrostatic pressure is the direct force driving fluid into the peritoneal cavity [1]. *Increased cardiac output* - **Increased cardiac output** typically leads to increased systemic circulation and can be a feature of advanced **cirrhosis** (hyperdynamic circulation). - However, it does not directly cause the *local* increase in hydrostatic pressure within the **portal system** that is responsible for ascites formation.

Question 1073: A 55-year-old man with cirrhosis develops ascites. Which of the following is a poor prognostic indicator in this patient?

A. Serum sodium <130 mEq/L (Correct Answer)
B. Elevated AST and ALT
C. Serum albumin >3 g/dL
D. Mild hepatic encephalopathy

Explanation: ***Serum sodium <130 mEq/L*** - **Hyponatremia** (serum sodium <130 mEq/L) in cirrhosis is a strong independent predictor of **poor prognosis** and is associated with increased mortality due to its reflection of severe liver dysfunction and fluid retention [1]. - It often indicates **dilutional hyponatremia** due to impaired free water excretion and high levels of ADH, contributing to increased risk of complications like **hepatic encephalopathy** and **hepatorenal syndrome** [1]. *Elevated AST and ALT* - While elevated **AST** (aspartate aminotransferase) and **ALT** (alanine aminotransferase) indicate **hepatocellular injury**, their prognostic value in advanced cirrhosis with ascites is often limited as they may normalize or even decrease with severe liver failure due to fewer viable hepatocytes [1]. - In end-stage liver disease, these enzymes are not as reliable as synthetic function tests (e.g., INR, albumin) or other markers of liver decompensation for assessing prognosis [1]. *Serum albumin >3 g/dL* - A serum albumin greater than 3 g/dL generally indicates **better preserved liver synthetic function** compared to lower levels, which is considered a relatively good prognostic sign, not a poor one. - Low albumin is a hallmark of **decompensated cirrhosis** and is typically associated with worse outcomes, including increased risk of ascites, edema, and mortality [1]. *Mild hepatic encephalopathy* - While hepatic encephalopathy is a complication of cirrhosis, **mild hepatic encephalopathy** (e.g., Grade 1 or 2, which are often reversible with treatment) is generally not considered as poor a prognostic indicator as severe hyponatremia [1]. - Although it points to liver dysfunction, its impact on immediate mortality is less direct compared to severe systemic complications like profound dilutional hyponatremia [1].

Question 1074: Which of the following is the most likely cause of bright red blood per rectum (hematochezia) in a 70-year-old patient?

A. Esophageal varices
B. Diverticulosis (Correct Answer)
C. Gastric cancer
D. Peptic ulcer disease

Explanation: ***Diverticulosis*** - **Diverticular bleeding** is a common cause of **painless bright red blood per rectum (hematochezia)**, particularly in older adults, due to rupture of blood vessels within diverticula [1]. - The diverticula are often found in the **colon**, making the bleeding lower gastrointestinal and thus resulting in bright red blood rather than melena. *Esophageal varices* - Typically present with **hematemesis** (vomiting blood) or **melena** (black, tarry stools) due to upper GI bleeding, not bright red blood per rectum. - They are associated with **portal hypertension**, primarily seen in patients with chronic liver disease. *Gastric cancer* - More commonly causes chronic, **occult GI bleeding** leading to iron deficiency anemia [2], or if severe, **melena** or **hematemesis**. - **Bright red blood per rectum** is generally not a typical presentation unless there is massive bleeding with rapid transit through the GI tract, which is less common. *Peptic ulcer disease* - A common cause of **upper GI bleeding**, usually presenting as **melena** or **hematemesis** [2]. - **Hematochezia** from a peptic ulcer would imply a very rapid bleed with extremely fast bowel transit time, which is atypical and associated with massive blood loss.

Question 1075: A patient presents with severe abdominal pain, distention, and jaundice. Serum amylase and lipase are elevated. What is the most likely diagnosis?

A. Peptic ulcer disease
B. Hepatitis
C. Acute pancreatitis (Correct Answer)
D. Gallstones

Explanation: ***Acute pancreatitis*** - The combination of **severe abdominal pain**, **distention**, and **jaundice**, along with **elevated serum amylase and lipase**, is highly indicative of acute pancreatitis [1]. - **Jaundice** may result from the obstruction of the common bile duct by inflammation or gallstones, a common cause of acute pancreatitis [2]. *Peptic ulcer disease* - While it can cause **severe abdominal pain**, it does not typically lead to **distention** or **jaundice** unless complicated by perforation or obstruction, and **amylase/lipase** are usually normal [1]. - Diagnosis is often confirmed by endoscopy, revealing **ulcerations** in the stomach or duodenum. *Hepatitis* - **Hepatitis** can cause **jaundice** and abdominal pain, particularly in the right upper quadrant, but it does not generally cause **abdominal distention** or elevated **amylase/lipase** levels. - Liver enzymes like **ALT and AST** would be significantly elevated. *Gallstones* - **Gallstones** can cause severe abdominal pain (biliary colic), and if they obstruct the common bile duct, can lead to **jaundice** and sometimes pancreatitis [2]. - However, **gallstones** themselves are a cause, not the diagnosis, for the described constellation of symptoms including **elevated amylase and lipase** which strongly points to acute pancreatitis.

Question 1076: A 35-year-old woman presents with jaundice, dark urine, and pruritus. Liver function tests reveal elevated alkaline phosphatase and conjugated bilirubin. What is the most likely diagnosis?

A. Chronic hepatitis B infection
B. Primary biliary cholangitis (Correct Answer)
C. Autoimmune hepatitis
D. Acute viral hepatitis

Explanation: ***Primary biliary cholangitis*** - The combination of **jaundice**, **dark urine**, and **pruritus** along with **elevated alkaline phosphatase** and **conjugated bilirubin** points towards a cholestatic liver disease [3]. - **Primary biliary cholangitis (PBC)** is an autoimmune disease characterized by the progressive destruction of small bile ducts, leading to cholestasis, and is more common in women [4]. *Chronic hepatitis B infection* - While it can cause jaundice and elevated bilirubin, **chronic hepatitis B** primarily leads to hepatocellular damage, which would typically present with significantly elevated aminotransferases (AST/ALT) rather than predominantly elevated alkaline phosphatase [2]. - Pruritus is less common and often indicative of significant cholestasis, which is not the primary pathology in uncomplicated chronic hepatitis B. *Autoimmune hepatitis* - This condition is characterized by immune-mediated hepatocellular inflammation, leading to elevated **aminotransferases (AST/ALT)** [1]. - While jaundice can occur, **alkaline phosphatase** elevation and significant pruritus are not the predominant features, unlike in cholestatic disorders. *Acute viral hepatitis* - **Acute viral hepatitis** typically presents with elevated aminotransferases (AST/ALT) that are often much higher than alkaline phosphatase, indicating hepatocellular injury [2]. - While jaundice and dark urine are common, the prominent **pruritus** and isolated severe elevation of alkaline phosphatase make a primary cholestatic disorder more likely [3].

Question 1077: A 60-year-old male presents with progressive dysphagia to solids and liquids, significant weight loss, and chest discomfort. Barium swallow shows a 'bird-beak' appearance. What is the most likely diagnosis?

A. Achalasia (Correct Answer)
B. GERD
C. Esophageal stricture
D. Esophageal cancer

Explanation: ***Achalasia*** - **Progressive dysphagia** to both solids and liquids, along with a **barium swallow** showing a "**bird-beak**" appearance, is highly characteristic of achalasia. [1] - This condition involves the **loss of peristalsis in the distal esophagus** and **impaired relaxation of the lower esophageal sphincter**. [1] *GERD* - Patients with **GERD** primarily experience **heartburn** and **regurgitation**, with dysphagia typically less prominent and usually only for solids initially. - A **barium swallow** would not typically show a "**bird-beak**" appearance, rather potential strictures or hiatal hernia. *Esophageal stricture* - **Esophageal stricture** typically presents with **progressive dysphagia to solids only** at first, later progressing to liquids. [2] - The **barium swallow** would show a **narrowed segment**, not the characteristic "**bird-beak**" seen in achalasia. *Esophageal cancer* - **Esophageal cancer** often causes **progressive dysphagia to solids**, significant **weight loss**, and sometimes pain, but the dysphagia for liquids typically develops much later. [2] - A **barium swallow** in cancer would show an **irregular, often asymmetric narrowing** with shelf-like borders, not the classic "**bird-beak**" of achalasia.

Question 1078: What is the primary mechanism by which Helicobacter pylori leads to peptic ulcer disease?

A. Increased gastric acid secretion due to H. pylori infection.
B. Increased production of gastric mucus.
C. Increased gastric motility due to H. pylori.
D. Decreased gastric mucosal protection due to H. pylori infection. (Correct Answer)

Explanation: ***Decreased gastric mucosal protection due to H. pylori infection.*** [1] - *Helicobacter pylori* primarily causes peptic ulcer disease by **damaging the protective mucosal layer** of the stomach and duodenum. - This bacterium produces enzymes like **urease**, which neutralizes gastric acid locally, allowing it to colonize the mucus layer and subsequently weaken its integrity, making the underlying cells vulnerable to acid. *Increased gastric acid secretion due to H. pylori infection.* - While *H. pylori* can indirectly affect gastric acid secretion (e.g., by altering gastrin and somatostatin release), its primary and most direct mechanism for ulcer formation is **mucosal damage**, not solely increased acid. [1] - Some strains directly influence **parietal cell function**, but this is a secondary effect compared to the direct mucosal assault. [1] *Increased production of gastric mucus.* - *H. pylori* infection typically leads to a **reduction** or alteration in gastric mucus production and quality, not an increase. - The bacterium thrives by **penetrating the mucus layer**, indicating that it benefits from a compromised barrier rather than an enhanced one. *Increased gastric motility due to H. pylori.* - There is no direct evidence that *H. pylori* significantly increases **gastric motility** as a primary mechanism for peptic ulcer development. - Motility disorders are not considered a hallmark of *H. pylori*-induced ulcerogenesis.

Question 1079: A 50-year-old male presents with hematemesis and jaundice. Endoscopy reveals esophageal varices. What is the most likely underlying cause of his condition?

A. Gastric cancer
B. Portal hypertension (Correct Answer)
C. Peptic ulcer disease
D. Duodenal ulcer

Explanation: ***Portal hypertension*** - **Esophageal varices** are a direct consequence of **portal hypertension**, where increased pressure in the portal venous system causes collateral circulation to divert blood, leading to enlarged veins in the esophagus [1]. - The combination of **hematemesis** (from ruptured varices) and **jaundice** (often indicative of **liver dysfunction**, a common cause of portal hypertension) strongly points to this condition [1]. *Gastric cancer* - While gastric cancer can cause hematemesis due to bleeding from the tumor, it is not typically associated with **esophageal varices** or **jaundice** as primary manifestations. - Jaundice can occur in advanced stages due to liver metastases, but not usually in conjunction with variceal bleeding. *Peptic ulcer disease* - **Peptic ulcer disease** can cause **hematemesis** due to bleeding from ulcers in the stomach or duodenum. - However, it does not cause **esophageal varices** or **jaundice**, which are specifically related to portal venous system abnormalities and liver pathology. *Duodenal ulcer* - Similar to peptic ulcer disease, a **duodenal ulcer** can lead to **hematemesis** if it erodes into a blood vessel. - It does not cause **esophageal varices** or **jaundice**, which are indicators of **portal hypertension** and often significant **liver disease**.

Question 1080: All of the following are causes of lower gastrointestinal bleeding, EXCEPT:

A. Peptic ulcer disease (Correct Answer)
B. Angiodysplasia
C. Colorectal cancer
D. Diverticulosis

Explanation: ***Peptic ulcer disease*** - **Peptic ulcer disease** is a common cause of **upper gastrointestinal bleeding** because ulcers typically form in the stomach or duodenum [1]. - Bleeding from a peptic ulcer would usually manifest as **hematemesis** (vomiting blood) or **melena** (black, tarry stools) due to the digestion of blood in the upper GI tract, rather than bright red blood per rectum [2]. *Angiodysplasia* - **Angiodysplasia** involves dilated, fragile blood vessels in the GI tract, most commonly in the **right colon**, and is a significant cause of lower GI bleeding [3]. - It often leads to intermittent, painless bleeding, which can range from **occult blood loss** to frank hematochezia. *Colorectal cancer* - **Colorectal cancer** can cause lower GI bleeding due to the **fragile and ulcerated surface** of the tumor [3]. - Bleeding can be chronic and insidious, leading to **iron deficiency anemia**, or acute, presenting as visible blood in the stool [3]. *Diverticulosis* - **Diverticulosis** involves the presence of small, bulging pouches (diverticula) in the colon wall, and bleeding occurs when a **blood vessel** within the diverticulum erodes. - This is a very common cause of **painless, acute, and often massive lower GI bleeding** in older adults.

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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