Gastroenterology Practice Questions

Q: Which of the following is NOT a cause of secretory diarrhea?

Inflammatory bowel disease (IBD). ***Inflammatory bowel disease (IBD)*** - IBD, which includes **Crohn's disease** and **ulcerative colitis**, primarily causes **inflammatory diarrhea**, characterized by damage to the intestinal lining and often with presence of blood or pus [1]. - While fluid secretion can occur, the predominant mechanism is altered absorption due to inflammation and mucosal damage, rather than active secretion. *Celiac disease* - Celiac disease causes **malabsorptive diarrhea** due to immune-mediated damage to the small intestine villi upon gluten ingestion [1]. - This leads to impaired absorption of nutrients and water, rather than active secretion [4]. *Lactose intolerance* - Lactose intolerance results in **osmotic diarrhea**, where undigested lactose in the gut draws water into the lumen [2]. - It does not involve active fluid secretion by the intestinal cells but rather an osmotic effect [3]. *Gastrinoma* - A gastrinoma is a neuroendocrine tumor that secretes excessive **gastrin**, leading to **Zollinger-Ellison syndrome**. - High gastrin levels cause increased gastric acid secretion, which overwhelms the intestine's neutralizing capacity, leading to inactivation of pancreatic enzymes and mucosal damage, all contributing to **secretory diarrhea**.

Q: Which of the following drugs is least effective or not typically used in the treatment of ulcerative colitis?

Methotrexate. ***Methotrexate*** - **Methotrexate** is not a primary or highly effective treatment for ulcerative colitis compared to other immunomodulators. - While it sees use in Crohn's disease, its efficacy in **ulcerative colitis** is limited and generally not recommended. *Corticosteroids* - **Corticosteroids** are highly effective for inducing remission in moderate to severe ulcerative colitis due to their potent anti-inflammatory effects. - They are used for short-term control of flares but not for long-term maintenance due to significant side effects. *Azathioprine* - **Azathioprine** is an effective immunomodulator used for maintaining remission in ulcerative colitis, often as a steroid-sparing agent. - It works by suppressing the immune system over time, reducing the frequency and severity of disease flares. *Sulfasalazine* - **Sulfasalazine** is a 5-aminosalicylate (5-ASA) drug that is a cornerstone of treatment for mild to moderate ulcerative colitis. - It works topically in the colon to reduce inflammation and is used for both induction and maintenance of remission.

Q: Tenesmus occurs in lesions of the colon.

Sigmoid colon. ***Sigmoid colon*** - Lesions in the **sigmoid colon** are most commonly associated with **tenesmus** because of its proximity to the rectum and its role in stool storage and defecation. - Inflammation or obstruction in this region can trigger a constant urge to defecate, even when the bowel is empty. *Lesions on the right side of the colon* - **Right-sided colon lesions** are typically associated with symptoms like **anemia**, occult bleeding, and vague abdominal pain due to their larger luminal diameter, rather than tenesmus. - The right colon is primarily involved in **water and electrolyte absorption**, and lesions here don't usually cause the sensation of incomplete evacuation linked to tenesmus. *Lesions in the descending colon* - While the **descending colon** is involved in stool transit, lesions here are less likely to cause prominent tenesmus compared to the sigmoid colon. - Symptoms usually involve **changes in bowel habits**, abdominal pain, or blood in stool, but typically without the persistent urgency characteristic of tenesmus. *Ileal lesions* - **Ileal lesions** (in the small intestine) are associated with symptoms like malabsorption, abdominal pain, and diarrhea [2]. - The ileum is located far from the rectum and anal canal, so it does not directly influence the sensation of **incomplete defecation** or tenesmus [1].

Q: Volcano ulcers in the esophagus are seen in

Herpetic esophagitis. ***Herpetic esophagitis*** - **Herpes simplex virus (HSV)** esophagitis is characterized by multiple, small **volcano-like ulcers** with a raised border and central erosion. - These ulcers are typically formed by the rupture of HSV-induced vesicles, commonly found in **immunocompromised patients**. *Candida esophagitis* - This condition is characterized by **white, adherent plaques or pseudomembranes** on the esophageal mucosa, not discrete volcano ulcers. - It is caused by **Candida albicans** and often presents with dysphagia and odynophagia, particularly in immunocompromised individuals. *Aphthous ulcer in Crohn's* - **Aphthous ulcers** in Crohn's disease are typically found in the mouth, but can occur in the esophagus, though they are usually **solitary, deep craters** with undermined edges rather than volcano-like lesions. - These ulcers are associated with **granulomatous inflammation** and tend to be more painful and chronic. *HIV esophagitis* - **HIV-associated esophageal ulcers** are often large, shallow, and discrete, but they do not typically present with the classic "volcano" morphology. - These ulcers are primarily thought to be related to **idiopathic processes** or other opportunistic infections, not specifically "volcano" ulcers.

Q: What is the most common cause of lower gastrointestinal bleeding?

Angiodysplasia. ***Angiodysplasia*** - Angiodysplasia is the **most frequent cause** of lower gastrointestinal bleeding, particularly in **elderly patients**, and often presents as painless, recurrent bleeding [1]. - These are **small vascular malformations** that can be found throughout the GI tract, most commonly in the right colon [1]. *Diverticulitis* - While **diverticular disease** (diverticulosis) is a common cause of lower GI bleeding, **diverticulitis** itself (inflammation of diverticula) typically presents with abdominal pain and fever, and bleeding is less common. - Bleeding from diverticulosis is usually **painless** and can be substantial, but **diverticulitis** is not the most common cause of bleeding overall. *Anal fissure* - An anal fissure is a small tear in the lining of the anus, causing **bright red bleeding** on toilet paper or stool, but the volume of blood is usually **minimal** and not considered a major cause of significant lower GI bleeding. - It is typically associated with **severe pain during defecation**, which is not implied in a general question about the most common cause of lower GI bleeding. *Colorectal carcinoma* - Colorectal carcinoma can cause chronic, **occult bleeding** or intermittent, small amounts of **frank blood** in the stool [1]. - While it's a serious cause of GI bleeding, it is **not the most common** cause in the general population compared to angiodysplasia or diverticulosis (when considered broadly) [1].

Q: All are true regarding familial adenomatous polyposis except which of the following?

Autosomal recessive. ***Autosomal recessive*** - **Familial adenomatous polyposis (FAP)** is inherited in an **autosomal dominant** pattern, not autosomal recessive. - It is caused by a germline mutation in the **APC gene** on chromosome 5q21-q22. *Associated endocrine involvement can be present* - **Gardner syndrome**, a variant of FAP, is associated with **extracolonic manifestations**, including benign osteomas, desmoid tumors, and epidermal cysts, which can be linked to endocrine disturbances [1]. - Other manifestations can include **adrenal adenomas** and **thyroid cancer**, reflecting potential widespread systemic involvement. *Multiple duodenal polyps* - FAP is characterized by the development of numerous **adenomatous polyps** throughout the gastrointestinal tract, especially in the **colon and rectum**. - **Duodenal polyps**, particularly in the periampullary region, are common and can malignant change, requiring regular surveillance [1]. *More > 100 polyps in the colon* - The defining feature of FAP is the presence of **hundreds to thousands of colorectal adenomatous polyps**, often exceeding 100. - These polyps have a nearly **100% risk of malignant transformation** into colorectal cancer if left untreated.

Q: Which of the following conditions is a known precipitating factor for hepatic encephalopathy?

Gastrointestinal bleeding. **Gastrointestinal bleeding** - **Gastrointestinal bleeding** leads to an increased protein load in the intestines (from blood), which is then broken down by bacteria into **ammonia** [1]. - This elevated ammonia level overwhelms the liver's capacity to detoxify it, leading to its accumulation in the systemic circulation and subsequent entry into the brain, causing **hepatic encephalopathy** [1]. *Increased potassium* - While electrolyte imbalances can affect neurological function, **hyperkalemia** (increased potassium) is not a direct or prominent precipitating factor for hepatic encephalopathy. - Hyperkalemia primarily affects **cardiac and neuromuscular excitability**, rather than ammonia metabolism. *Constipation* - **Constipation** prolongs the transit time of stool in the colon, allowing more time for gut bacteria to produce **ammonia** from protein breakdown [1]. - This increased production of ammonia contributes to its accumulation and can precipitate or worsen hepatic encephalopathy, but it is not the most significant factor like GI bleeding. (The question is which of the following is THE precipitating factor for HE, not the other way around) *Dehydration* - **Dehydration** can lead to **prerenal azotemia** and hemoconcentration, which may increase the blood urea nitrogen (BUN) and worsen renal function. - While dehydration can indirectly affect the body's ability to clear toxins, it is not a direct precipitating factor for hepatic encephalopathy in the same way as increased ammonia production or reduced effective circulating volume.

Q: Which of the following is a common cause of acute pancreatitis?

Gallstones. ***Gallstones*** - **Gallstones** are the most common cause of acute pancreatitis, as they can **obstruct the common bile duct** at the ampulla of Vater, leading to reflux of bile into the pancreatic duct [1]. - This obstruction causes **pancreatic enzyme activation** within the gland, leading to autodigestion and inflammation [1]. *Elevated serum amylase levels* - **Elevated serum amylase levels** are a diagnostic marker for acute pancreatitis, not a cause. - They indicate pancreatic injury and enzyme release but do not initiate the condition. *Acute alcohol consumption* - **Acute alcohol consumption** is a significant cause of acute pancreatitis but is the second leading cause after gallstones. - While alcohol triggers premature activation of pancreatic enzymes, it is not the *most common* cause. *None of the options* - This option is incorrect because **gallstones** are a well-established and the most common cause of acute pancreatitis [1].

Q: A 60-year-old male experienced a sudden fall in the toilet, with a blood pressure of 90/50 mm Hg and a pulse of 100 beats per minute. His relatives reported that his stool was black or dark in color. Further careful history revealed that he was a known case of hypertension and coronary artery disease, and was regularly taking aspirin, atenolol, and isosorbide dinitrate. What is the most likely diagnosis?

Gastric ulcer with hemorrhage. ### Gastric ulcer with hemorrhage - The patient's **hypotension** (90/50 mmHg), **tachycardia** (100 bpm), and a sudden fall are indicative of **hypovolemic shock**, most likely due to significant **blood loss** [1]. - **Black or dark stools (melena)** are a classic sign of **upper gastrointestinal bleeding**, commonly caused by a **gastric ulcer**, especially in a patient taking **aspirin**, which can cause gastrointestinal irritation and ulceration [1]. *Acute myocardial infarction* - While the patient has coronary artery disease, the primary symptoms presented (melena, signs of hypovolemia) are not typical of an **acute myocardial infarction**, which usually causes chest pain, dyspnea, and EKG changes. - Patients with MI can experience hypotension, but it's usually due to **cardiogenic shock**, and the GI bleed evidence points elsewhere. *Stroke* - A stroke typically presents with **focal neurological deficits** (e.g., weakness, speech difficulties), which are not described in this scenario. - While a fall can be a symptom of a stroke, the complete clinical picture including melena strongly points away from a primary neurological event. *Pulmonary embolism* - Pulmonary embolism typically presents with **acute dyspnea**, **chest pain**, and **tachycardia**, often without hypotension initially, or with right-sided heart strain. - The presence of melena and signs of hypovolemic shock are not consistent with a primary diagnosis of **pulmonary embolism**.

Question 1

Which of the following is NOT a cause of secretory diarrhea?

Accepted Answer

Inflammatory bowel disease (IBD)

Answer

Lactose intolerance

Answer

Gastrinoma

Answer

Celiac disease

Question 2

Which of the following drugs is least effective or not typically used in the treatment of ulcerative colitis?

Accepted Answer

Methotrexate

Answer

Corticosteroids

Answer

Azathioprine

Answer

Sulfasalazine

Question 3

Tenesmus occurs in lesions of the colon.

Accepted Answer

Sigmoid colon

Answer

Lesions on the right side of the colon

Answer

Lesions in the descending colon

Answer

Ileal lesions

Question 4

Volcano ulcers in the esophagus are seen in

Accepted Answer

Herpetic esophagitis

Answer

Candida esophagitis

Answer

HIV esophagitis

Answer

Aphthous ulcer in Crohn's

Question 5

What is the most common cause of lower gastrointestinal bleeding?

Accepted Answer

Angiodysplasia

Answer

Anal fissure

Answer

Diverticulitis

Answer

Colorectal carcinoma

Question 6

Which of the following statements about Wilson's disease is false?

Accepted Answer

Urinary copper excretion < 100 micrograms/day

Answer

Autosomal recessive

Answer

Serum ceruloplasmin level < 20 mg/dl

Answer

Zinc acetate is used as maintenance therapy

Question 7

All are true regarding familial adenomatous polyposis except which of the following?

Accepted Answer

Autosomal recessive

Answer

Associated endocrine involvement can be present

Answer

Multiple duodenal polyps

Answer

More > 100 polyps in the colon

Question 8

Which of the following conditions is a known precipitating factor for hepatic encephalopathy?

Accepted Answer

Gastrointestinal bleeding

Answer

Increased potassium

Answer

Constipation

Answer

Dehydration

Question 9

Which of the following is a common cause of acute pancreatitis?

Accepted Answer

Gallstones

Answer

Acute alcohol consumption

Answer

Elevated serum amylase levels

Answer

None of the options

Question 10

A 60-year-old male experienced a sudden fall in the toilet, with a blood pressure of 90/50 mm Hg and a pulse of 100 beats per minute. His relatives reported that his stool was black or dark in color. Further careful history revealed that he was a known case of hypertension and coronary artery disease, and was regularly taking aspirin, atenolol, and isosorbide dinitrate. What is the most likely diagnosis?

Accepted Answer

Gastric ulcer with hemorrhage

Answer

Acute myocardial infarction

Answer

Stroke

Answer

Pulmonary embolism

Gastroenterology — MCQs

Gastroenterology — MCQs

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