Gastroenterology Practice Questions

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

Portal hypertension. ***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**.

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

Peptic ulcer disease. ***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.

Q: All of the following are causes of chronic constipation EXCEPT which of the following?

Crohn’s disease. Crohn's disease - Crohn's disease is an inflammatory bowel disease that typically causes diarrhea, abdominal pain, and weight loss due to inflammation, most commonly in the small intestine and colon. - While strictures and small bowel obstruction can occur and lead to changes in bowel habits, chronic constipation is not a typical presenting symptom; diarrhea is far more common. Hypothyroidism - Decreased thyroid hormone levels lead to reduced metabolic rate, which can slow down gastrointestinal motility. [1] - This slowed colonic transit is a common cause of chronic constipation. [1] Diabetic neuropathy - Autonomic neuropathy affecting the gastrointestinal tract can impair coordination of intestinal muscle contractions and reduce colonic motility. [1] - This nerve damage can lead to gastroparesis and chronic constipation in diabetic patients. [1] Irritable bowel syndrome - Irritable bowel syndrome (IBS) is a functional gastrointestinal disorder characterized by recurrent abdominal pain associated with changes in bowel habits. - A significant subtype, IBS with constipation (IBS-C), presents with chronic constipation as a predominant symptom, often alternating with diarrhea or normal stools.

Q: Which of the following is the most common cause of esophageal dysphagia?

Peptic stricture. ***Peptic stricture*** - **Peptic strictures** are fibrous bands that narrow the esophageal lumen, most commonly resulting from chronic **gastroesophageal reflux disease (GERD)** [1]. - They lead to dysphagia by physically obstructing the passage of food, making it the most frequent cause of mechanical esophageal dysphagia [2]. *Gastroesophageal reflux disease (GERD)* - While **GERD** is the underlying cause for many peptic strictures, it primarily presents with **pyrosis (heartburn)** and **regurgitation** [1]. - Without a stricture or severe inflammation, GERD itself causes dysphagia less commonly than a resultant peptic stricture would. *Esophageal cancer* - **Esophageal cancer** can cause significant dysphagia, especially for solids, and is a serious concern, but it is less common overall than dysphagia caused by peptic strictures [1]. - Often accompanied by other symptoms like **weight loss**, **anemia**, and **odynophagia**, which differentiate it. *Achalasia* - **Achalasia** is a motility disorder where the lower esophageal sphincter fails to relax, leading to pressure build-up and dysphagia for both solids and liquids [3]. - Though a significant cause of dysphagia, its prevalence is lower compared to peptic strictures resulting from widespread GERD.

Q: A 60-year-old man presents with melena and dizziness. His blood pressure is 90/60 mmHg, and heart rate is 110 bpm. Which of the following is the most appropriate initial management?

IV fluids and blood transfusion. IV fluids and blood transfusion - The patient presents with **melena**, **dizziness**, and signs of **hypovolemic shock** (low blood pressure, high heart rate), indicating significant gastrointestinal bleeding [1]. - **Fluid resuscitation** with intravenous crystalloids and **blood transfusion** are critical initial steps to stabilize hemodynamics and address blood loss [1]. *Endoscopic biopsy* - An **endoscopic biopsy** is a diagnostic procedure used to determine the cause of bleeding but is not the most appropriate *initial* management for an acutely hemorrhaging, unstable patient [1]. - Prioritizing hemodynamic stability is crucial before pursuing definitive diagnostic procedures that might be delayed or complicated by the patient's condition. *Colonoscopy* - **Colonoscopy** is primarily used to investigate lower gastrointestinal bleeding and is not the initial management for upper GI bleeding suspected from melena. - Like endoscopic biopsy, it is a diagnostic procedure and would be contraindicated in an unstable patient until initial resuscitation has been performed. *Oral proton pump inhibitors* - While **proton pump inhibitors (PPIs)** are often used in the management of upper GI bleeding to reduce acid secretion and promote clot stability, **oral administration** is insufficient for an actively bleeding patient who may have impaired absorption or be NPO (nil per os) [2]. - Intravenous PPIs might be considered after initial resuscitation, but they are not the primary, immediate intervention to correct hypovolemic shock [2].

Q: How does achalasia lead to dysphagia?

Increased lower esophageal sphincter pressure. ***Increased lower esophageal sphincter pressure*** - In achalasia, the **lower esophageal sphincter (LES)** fails to relax properly during swallowing, leading to a functional obstruction [1]. - This persistent high pressure prevents food from passing easily from the esophagus into the stomach, causing **dysphagia**. *Esophageal stricture* - An **esophageal stricture** is a narrowing of the esophagus, often due to inflammation, scarring, or malignancy [2]. - While it causes dysphagia, achalasia is primarily a **motility disorder** involving the LES, not a fixed structural narrowing. *Neuromuscular dysfunction of the esophagus* - This is a broad term that technically encompasses achalasia but does not directly explain *how* it causes dysphagia. - The specific dysfunction in achalasia involves the **loss of inhibitory neurons** in the myenteric plexus, leading to impaired LES relaxation and uncoordinated esophageal contractions [1]. *Decreased esophageal motility* - While achalasia does involve **aperistalsis** (lack of coordinated contractions) in the esophageal body, contributing to food retention, the primary obstructive mechanism is the **failure of LES relaxation** [1]. - Decreased motility alone, without LES dysfunction, would typically lead to different patterns of dysphagia or regurgitation.

Q: A 45-year-old female presents with chronic heartburn and dysphagia. Endoscopy reveals Barrett's esophagus. What is the most appropriate next step in management?

Surveillance endoscopy. ### Surveillance endoscopy - Barrett's esophagus is a **premalignant condition** where the squamous lining of the esophagus is replaced by columnar epithelium, increasing the risk of **esophageal adenocarcinoma** [1]. - **Regular endoscopic surveillance** with biopsies is crucial to monitor for **dysplasia** and early cancer, guiding timely intervention [1]. *High-dose proton pump inhibitors* - While **PPIs** are the cornerstone for managing **GERD symptoms** and preventing further esophageal damage in patients with Barrett's, they do not reverse Barrett's esophagus itself or eliminate the risk of malignant progression [1]. - They may reduce the progression rate of Barett's esophagus to **dysplasia**, but not as the primary next step. *Nissen fundoplication* - This is a surgical procedure to treat severe **gastroesophageal reflux disease (GERD)** by strengthening the lower esophageal sphincter. - It effectively treats reflux symptoms but does **not reverse existing Barrett's esophagus** or negate the need for surveillance. *Esophagectomy* - **Esophagectomy** is a major surgical procedure involving the removal of part or all of the esophagus and is typically reserved for patients with **high-grade dysplasia** or **confirmed esophageal adenocarcinoma**. - It is an overly aggressive and inappropriate initial management step for uncomplicated Barrett's esophagus without advanced dysplasia or cancer.

Q: All of the following are potential complications of untreated GERD, EXCEPT which of the following?

Esophageal varices. ***Esophageal varices*** - **Esophageal varices** are dilated veins in the lower esophagus, almost exclusively caused by **portal hypertension** from conditions like cirrhosis. - They are not a direct complication of **gastroesophageal reflux disease (GERD)**; GERD deals with acid reflux, not increased portal venous pressure. *Esophageal adenocarcinoma* - **Esophageal adenocarcinoma** can develop from **Barrett's esophagus**, which is a metaplastic change in the esophageal lining caused by chronic acid exposure from GERD [1]. - Therefore, untreated GERD can progress through Barrett's esophagus to develop into this type of cancer [1]. *Esophageal stricture* - Chronic inflammation and injury from untreated GERD can lead to **fibrosis** and subsequent narrowing of the esophagus, known as an **esophageal stricture** [1]. - This stricture can cause difficulty swallowing and food impaction. *Barrett's esophagus* - **Barrett's esophagus** is a precancerous condition where the normal squamous epithelium of the esophagus is replaced by columnar epithelium due to chronic acid reflux from GERD [1]. - It is a significant risk factor for esophageal adenocarcinoma and directly results from long-standing GERD [1].

Q: A 55-year-old man presents with intermittent epigastric pain, relieved by eating, and worsened by fasting. What is the most likely cause?

Peptic ulcer disease. ### Peptic ulcer disease - The classic presentation of **duodenal ulcers**, a common type of peptic ulcer, includes epigastric pain that is **relieved by eating** and **worsens with fasting** [1]. - This pattern is due to the buffering effect of food on gastric acid and the increased acid secretion during fasting, which irritates the ulcer. *Cholelithiasis* - Characterized by **biliary colic**, which is typically severe, intermittent right upper quadrant pain, often radiating to the back or shoulder, and frequently triggered by fatty meals. - Pain relief with eating is not a typical feature, and it does not usually worsen with fasting. *Chronic pancreatitis* - Presents with persistent or recurrent **epigastric pain** that often **radiates to the back** [2], and can be worsened by eating fatty foods. - The pain is usually not relieved by eating, and symptoms like steatorrhea and diabetes development are common later in the disease [2]. *Gastroesophageal reflux disease (GERD)* - Primarily causes **heartburn** (burning sensation behind the sternum) and **regurgitation**, which often worsen after meals, when lying down, or bending over. - Pain is typically not relieved by eating, nor does it characteristically worsen with fasting; instead, it is often associated with acid reflux.

Q: A 65-year-old female presents with chronic right lower quadrant pain and a palpable mass. A CT scan shows a thickened cecum and multiple lymph nodes. What is the most likely diagnosis?

Cecal cancer. ***Cecal cancer*** - The combination of **chronic right lower quadrant pain**, a **palpable mass**, and **thickened cecum** with **lymphadenopathy** on CT in an older patient is highly suggestive of cecal cancer. - **Age** is a significant risk factor for colorectal cancer, and the given symptoms align well with a malignant process in the cecum. In the caecum or ascending colon, tumors often arise from malignant transformation, and lymphatic invasion is common at presentation [1]. *Appendicitis* - Acute appendicitis typically presents with **acute-onset pain** that migrates from periumbilical to the right lower quadrant, often accompanied by fever and leukocytosis, which are not mentioned. - While a mass can form in complicated cases (appendiceal abscess), the **chronic nature** of the pain and prominent lymphadenopathy are less typical. *Diverticulitis* - Diverticulitis most commonly affects the **left lower quadrant** (sigmoid colon) and presents with acute abdominal pain, fever, and leukocytosis. - While right-sided diverticulitis can occur, it's less common and less likely to present with a **chronic palpable mass** and lymphadenopathy, especially in this age group without other inflammatory markers. *Crohn's disease* - Crohn's disease can cause **chronic right lower quadrant pain** due to involvement of the terminal ileum and cecum, and may show bowel wall thickening. - However, a **palpable mass** in the absence of other symptoms like diarrhea, weight loss, or constitutional symptoms, along with significant lymphadenopathy, makes Crohn's less likely than malignancy in this age group.

Question 1

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

Accepted Answer

Portal hypertension

Answer

Gastric cancer

Answer

Peptic ulcer disease

Answer

Duodenal ulcer

Question 2

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

Accepted Answer

Peptic ulcer disease

Answer

Angiodysplasia

Answer

Colorectal cancer

Answer

Diverticulosis

Question 3

All of the following are causes of chronic constipation EXCEPT which of the following?

Accepted Answer

Crohn’s disease

Answer

Hypothyroidism

Answer

Diabetic neuropathy

Answer

Irritable bowel syndrome

Question 4

Which of the following is the most common cause of esophageal dysphagia?

Accepted Answer

Peptic stricture

Answer

Gastroesophageal reflux disease (GERD)

Answer

Esophageal cancer

Answer

Achalasia

Question 5

A 60-year-old man presents with melena and dizziness. His blood pressure is 90/60 mmHg, and heart rate is 110 bpm. Which of the following is the most appropriate initial management?

Accepted Answer

IV fluids and blood transfusion

Answer

Endoscopic biopsy

Answer

Colonoscopy

Answer

Oral proton pump inhibitors

Question 6

How does achalasia lead to dysphagia?

Accepted Answer

Increased lower esophageal sphincter pressure

Answer

Esophageal stricture

Answer

Neuromuscular dysfunction of the esophagus

Answer

Decreased esophageal motility

Question 7

A 45-year-old female presents with chronic heartburn and dysphagia. Endoscopy reveals Barrett's esophagus. What is the most appropriate next step in management?

Accepted Answer

Surveillance endoscopy

Answer

High-dose proton pump inhibitors

Answer

Nissen fundoplication

Answer

Esophagectomy

Question 8

All of the following are potential complications of untreated GERD, EXCEPT which of the following?

Accepted Answer

Esophageal varices

Answer

Esophageal adenocarcinoma

Answer

Esophageal stricture

Answer

Barrett's esophagus

Question 9

A 55-year-old man presents with intermittent epigastric pain, relieved by eating, and worsened by fasting. What is the most likely cause?

Accepted Answer

Peptic ulcer disease

Answer

Cholelithiasis

Answer

Chronic pancreatitis

Answer

Gastroesophageal reflux disease (GERD)

Question 10

A 65-year-old female presents with chronic right lower quadrant pain and a palpable mass. A CT scan shows a thickened cecum and multiple lymph nodes. What is the most likely diagnosis?

Accepted Answer

Cecal cancer

Answer

Appendicitis

Answer

Diverticulitis

Answer

Crohn's disease

Gastroenterology — MCQs

Gastroenterology — MCQs

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