Gastroenterology Practice Questions

Q: A 70-year-old woman with a history of ovarian cancer presents with diarrhea, having completed radiation therapy for her cancer 3 months prior. Physical examination reveals cachexia, hyperactive bowel sounds, and generalized pallor. The stools contain blood, and a complete blood count shows decreased hemoglobin (7.8 g/dL) and decreased mean corpuscular volume (70 fL). Which of the following is the most likely cause of gastrointestinal bleeding in this patient?

Radiation enterocolitis. ***Radiation enterocolitis*** - Following radiation therapy, patients can develop inflammation and damage to the **intestinal lining**, leading to symptoms such as diarrhea and gastrointestinal bleeding [1]. - The presence of **cachexia** and **decreased hemoglobin** indicates significant pathology, aligning with this diagnosis following her recent treatment for ovarian cancer. *Ischemic colitis* - Often presents with **abdominal pain** and is usually associated with risk factors like **vascular disease**, which is not described here [2]. - Symptoms typically include **bloody diarrhea**, but the link with recent radiation therapy makes this diagnosis less likely. *Hemorrhoids* - Generally cause **bright red blood per rectum** and are more associated with changes in bowel habits rather than diarrhea and cachexia. - The absence of a **history of straining** or other typical risk factors suggests that hemorrhoids are unlikely in this scenario. *Angiodysplasia* - Typically presents during older age and can cause gastrointestinal bleeding, but is usually associated with **chronic anemia** rather than the acute symptoms seen here [3]. - Without a significant previous history of bleeding or vascular anomalies, this condition is an unlikely cause for her symptoms.

Q: Which complication is most commonly associated with prepyloric ulcers?

Bleeding. ***Bleeding*** - **Upper gastrointestinal bleeding** is the most common and often the most life-threatening complication of prepyloric ulcers. - This can manifest as **hematemesis** (vomiting blood) or **melena** (black, tarry stools). *Penetration* - This occurs when the ulcer erodes through the gastric wall into an adjacent organ, such as the pancreas or liver. - While a serious complication, it is **less common** than bleeding. *Gastric outlet obstruction* - This complication typically results from chronic inflammation, scarring, or edema at or near the pylorus. - While possible with severe prepyloric ulcers, it is **not the most frequent** presentation of a complication. *Perforation* - This involves the ulcer creating a hole through the entire wall of the stomach, leading to the leakage of gastric contents into the abdominal cavity. - While a life-threatening emergency, **perforation is less common** than bleeding.

Q: Gastrin-secreting tumors (gastrinomas) are most commonly found in which location?

Duodenum or pancreas. Duodenum or pancreas - The majority, approximately 80%, of gastrinomas are found in the duodenum or pancreas [1]. - These tumors secrete excessive gastrin, leading to Zollinger-Ellison syndrome [1]. Stomach antrum - The stomach antrum contains G cells that produce gastrin, but primary gastrinomas rarely originate here. - While G-cell hyperplasia can occur in the antrum, it is distinct from a gastrin-secreting tumor (gastrinoma). Liver - The liver is a common site for metastases from gastrinomas, but it is not typically the primary site of tumor origin [1]. - Primary liver cancers are usually hepatocellular carcinomas or cholangiocarcinomas, which do not secrete gastrin. Small intestine (jejunum/ileum) - Gastrinomas are only rarely found in the more distal parts of the small intestine, such as the jejunum or ileum. - The duodenum and pancreas are the predominant locations for these neuroendocrine tumors due to embryological development and cell differentiation.

Q: A patient presents with unconjugated hyperbilirubinemia and the presence of urobilinogen in urine. Which of the following is the least likely diagnosis?

Dubin Johnson syndrome. ***Dubin Johnson syndrome*** - This syndrome primarily causes **conjugated hyperbilirubinemia** due to a defect in bilirubin excretion from hepatocytes. - The presence of **unconjugated hyperbilirubinemia** and **urobilinogen** in urine makes Dubin-Johnson syndrome the least likely diagnosis. *Crigler Najjar syndrome* - This is a rare genetic disorder characterized by **unconjugated hyperbilirubinemia** due to a severe deficiency or absence of the enzyme **uridine diphosphate-glucuronosyltransferase (UGT1A1)**. - While it causes unconjugated hyperbilirubinemia, the presence of **urobilinogen** indicates some bilirubin conjugation and excretion into the gut, making this less likely than other causes of unconjugated hyperbilirubinemia with urobilinogen. *Gilbert's syndrome* - This common, mild genetic disorder causes **unconjugated hyperbilirubinemia** due to reduced activity of the **UGT1A1 enzyme**, leading to decreased bilirubin conjugation. - Since some conjugation still occurs, the presence of **urobilinogen** (formed from conjugated bilirubin in the gut) is consistent with this diagnosis. *Hemolytic Jaundice* - **Hemolysis** leads to an increased breakdown of red blood cells, producing a large amount of **unconjugated bilirubin** that overwhelms the liver's conjugating capacity. - The liver still conjugates some of this bilirubin, which is then excreted into the gut, leading to increased **urobilinogen** formation and excretion in urine.

Q: A patient presents with multiple secondary types of lesions in the liver, non-responding diarrhea, and flushing. It is most probably due to a lesion in:

Small intestine. ***Small intestine*** - The presence of **non-responding diarrhea** and **flushing** suggests a neuroendocrine tumor, particularly one that secretes **somatostatin**, commonly associated with the small intestine [1]. - The **multiple liver lesions** often indicate metastasis from an intestinal primary, further supporting a lesion in the small intestine [1]. *Liver* - While liver lesions are present, they are **secondary** and not the primary source of symptoms, which are more indicative of a gastrointestinal origin [1]. - Liver lesions alone do not typically cause **flushing** or **non-responding diarrhea** without an associated primary tumor in the intestine. *Stomach* - Gastric lesions can cause various symptoms but are less commonly associated with **flushing** and **diarrhea**, particularly of the non-responsive type seen here. - Stomach-specific conditions often relate more to **ulcerations** or bleeding than the systemic endocrine symptoms presented. *Large intestine* - While lesions in the large intestine can lead to **diarrhea**, they do not often present with **flushing** or involve multiple liver lesions. - This type of presentation is more characteristic of small intestinal involvement, especially in cases of **carcinoid syndrome** from neuroendocrine tumors [1].

Q: Which of the following is not a common cause of chronic gastritis?

Gastric ulcer. ***Overuse of salicylates*** - Salicylates can cause **acute gastritis** [1] but are not commonly associated with chronic gastritis. - Chronic gastritis is typically linked to **long-term irritation** rather than with the short-term use of salicylates. *Gastric ulcer* - Gastric ulcers are a consequence of chronic gastritis rather than a cause; they often result from the long-term **inflammation** of the gastric lining [1]. - They create a cycle where **chronic irritation** leads to ulceration, worsening gastritis. *Pernicious anaemia* - Pernicious anaemia can lead to **chronic atrophic gastritis** [1], which is a form of chronic gastritis but is not a primary cause. - It is associated with **autoimmune processes** affecting gastric mucosa and vitamin B12 absorption. *H. Pylori* - Helicobacter pylori infection is a well-recognized cause of **chronic gastritis** across the globe [1]. - It leads to persistent **inflammatory changes** and is a key pathogen in the pathogenesis of chronic gastritis [1].

Q: What has contributed to the reduction of duodenal ulcer morbidity in the last decade?

Eradication of H. pylori. ### Eradication of H. pylori - The widespread success of **H. pylori eradication therapies** has directly addressed the primary cause of most duodenal ulcers [1]. - By eliminating the bacterial infection, the recurrence rate of ulcers dramatically decreases, leading to reduced morbidity [1]. *Use of proton pump inhibitors* - While **proton pump inhibitors (PPIs)** are highly effective in healing existing ulcers and managing symptoms, they do not address the underlying cause of *H. pylori* infection. - PPIs primarily reduce acid secretion but do not prevent the recurrence of ulcers driven by *H. pylori* [1]. *Lifestyle modifications* - **Lifestyle modifications** such as reducing stress, avoiding spicy foods, and quitting smoking can help manage symptoms and prevent exacerbations, but they are not primary treatments for duodenal ulcers. - These changes contribute to overall well-being but do not directly eliminate the main pathogenic factor, *H. pylori* [1]. *None of the options* - This option is incorrect because the **eradication of *H. pylori*** has demonstrably contributed to the reduction of duodenal ulcer morbidity in recent decades [1]. - The link between *H. pylori* and duodenal ulcers is well-established, and effective treatment for the infection has transformed ulcer management [1].

Q: Which of the following is a contraindication for medical management of gallstones?

Radiopaque stones. ***Radiopaque stones*** - **Radiopaque stones** are typically **calcium-rich** and do not dissolve with oral bile acid therapy [1]. - Medical dissolution therapy is primarily effective for cholesterol-rich stones, which are often radiolucent [1]. *Normal functioning gallbladder* - A **normal functioning gallbladder** is actually a prerequisite for medical dissolution therapy, as it needs to fill and empty to allow bile acids to reach the stones. - If the gallbladder is non-functioning, oral dissolution agents cannot effectively reach and act on the gallstones. *Small stones* - **Small stones** (typically <1.5 cm) are more amenable to medical dissolution therapy due to their higher surface area-to-volume ratio, facilitating faster dissolution [2]. - Therefore, small stones are an indication for, not a contraindication to, medical management. *Radiolucent stones* - **Radiolucent stones** are primarily composed of cholesterol, making them good candidates for dissolution with oral bile acid therapy [2]. - This characteristic indicates suitability for medical management, not a contraindication.

Q: Discriminant score is used for management of?

Alcoholic hepatitis. ***Alcoholic hepatitis*** - The **Maddrey Discriminant Function (MDF) score** is a widely used tool specifically for assessing the severity of alcoholic hepatitis [1]. - scores greater than or equal to 32 indicate **severe alcoholic hepatitis** and guide the decision for corticosteroid therapy. *Viral hepatitis* - Management of viral hepatitis (e.g., Hepatitis B or C) typically involves antiviral medications, and severity assessment relies on viral load, liver biopsy, and clinical features, not the **discriminant score**. - While liver function tests are important, specific discriminant scores are not the primary tool for guiding treatment decisions in **viral hepatitis**. *Variceal bleeding* - Prognostic scores for variceal bleeding include the **Child-Pugh score** and **MELD score**, which assess liver function and predict mortality in cirrhosis, but not the **discriminant score**. - Management focuses on endoscopic interventions and medications to prevent re-bleeding, not on a discriminant score. *Weight loss* - Weight loss is a symptom, not a diagnosis requiring a specific discriminant score for management. - Its management involves identifying and addressing the **underlying cause**, which can be diverse and does not typically involve such a score.

Question 1

A 70-year-old woman with a history of ovarian cancer presents with diarrhea, having completed radiation therapy for her cancer 3 months prior. Physical examination reveals cachexia, hyperactive bowel sounds, and generalized pallor. The stools contain blood, and a complete blood count shows decreased hemoglobin (7.8 g/dL) and decreased mean corpuscular volume (70 fL). Which of the following is the most likely cause of gastrointestinal bleeding in this patient?

Accepted Answer

Radiation enterocolitis

Answer

Angiodysplasia

Answer

Hemorrhoids

Answer

Ischemic colitis

Question 2

Which complication is most commonly associated with prepyloric ulcers?

Accepted Answer

Bleeding

Answer

Gastric outlet obstruction

Answer

Penetration

Answer

Perforation

Question 3

Gastrin-secreting tumors (gastrinomas) are most commonly found in which location?

Accepted Answer

Duodenum or pancreas

Answer

Liver

Answer

Stomach antrum

Answer

Small intestine (jejunum/ileum)

Question 4

A patient presents with unconjugated hyperbilirubinemia and the presence of urobilinogen in urine. Which of the following is the least likely diagnosis?

Accepted Answer

Dubin Johnson syndrome

Answer

Gilbert's syndrome

Answer

Crigler Najjar syndrome

Answer

Hemolytic Jaundice

Question 5

A patient presents with multiple secondary types of lesions in the liver, non-responding diarrhea, and flushing. It is most probably due to a lesion in:

Accepted Answer

Small intestine

Answer

Liver

Answer

Stomach

Answer

Large intestine

Question 6

Which of the following is not a common cause of chronic gastritis?

Accepted Answer

Gastric ulcer

Answer

H. Pylori

Answer

Pernicious anaemia

Answer

Overuse of salicylates

Question 7

What has contributed to the reduction of duodenal ulcer morbidity in the last decade?

Accepted Answer

Eradication of H. pylori

Answer

Use of proton pump inhibitors

Answer

Lifestyle modifications

Answer

None of the options

Question 8

Which of the following is a contraindication for medical management of gallstones?

Accepted Answer

Radiopaque stones

Answer

Normal functioning gallbladder

Answer

Small stones

Answer

Radiolucent stones

Question 9

Discriminant score is used for management of?

Accepted Answer

Alcoholic hepatitis

Answer

Viral hepatitis

Answer

Variceal bleeding

Answer

Weight loss

Question 10

In a young, otherwise healthy patient with a newly suspected diagnosis of peptic ulcer disease, what would be the most appropriate course of action in the emergency department?

Accepted Answer

Begin symptomatic and therapeutic treatment with a proton pump inhibitor (e.g., omeprazole)

Answer

Immediate referral for endoscopy

Answer

Begin combination therapy with an H2 receptor antagonist, proton pump inhibitor, and antacids

Answer

Begin empiric treatment of H. pylori with a triple antibiotic regimen after confirmation of infection

Gastroenterology — MCQs

Gastroenterology — MCQs

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