NR 507 Week 6 Pathophysiology Case Studies and Quiz 2026
Chamberlain
1. A patient presents with heartburn and regurgitation that worsens after meals
and when lying down. What is the most likely pathophysiologic mechanism?
A. Hypersecretion of gastrin
B. Delayed gastric emptying due to pyloric stenosis
C. Autoimmune destruction of parietal cells
D. Inappropriate relaxation of the lower esophageal sphincter
Answer: D
Rationale: Gastroesophageal Reflux Disease (GERD) is primarily caused by the relaxation
of the lower esophageal sphincter (LES), allowing gastric contents to enter the esophagus.
2. Which organism is most frequently associated with the development of
chronic antral gastritis and peptic ulcer disease?
A. Helicobacter pylori
B. Escherichia coli
C. Staphylococcus aureus
D. Clostridium difficile
Answer: A
Rationale: H. pylori is a spiral-shaped bacterium that colonizes the gastric mucosa and is
the leading cause of chronic gastritis and peptic ulcers.
,3. A patient with Crohn’s disease is likely to exhibit which of the following
characteristics on a colonoscopy?
A. Continuous ulceration starting from the rectum
B. Superficial mucosal inflammation only
C. Pseudopolyps throughout the sigmoid colon
D. Skip lesions and transmural inflammation
Answer: D
Rationale: Crohn’s disease is characterized by ‘skip lesions’ (discontinuous areas of
inflammation) and involves the entire thickness of the intestinal wall (transmural).
4. Portal hypertension is most commonly a complication of which condition?
A. Cholecystitis
B. Acute pancreatitis
C. Liver cirrhosis
D. Duodenal ulcers
Answer: C
Rationale: Cirrhosis causes fibrosis and scarring of the liver tissue, which obstructs blood
flow and leads to increased pressure in the portal venous system.
5. What is the primary cause of hepatic encephalopathy in patients with liver
failure?
A. Accumulation of unconjugated bilirubin
B. Infection by Hepatitis B virus
C. Decreased production of albumin
D. Increased levels of systemic ammonia
Answer: D
Rationale: The liver normally converts ammonia to urea; when it fails, ammonia
accumulates in the blood and crosses the blood-brain barrier, causing neurotoxicity.
, 6. Which type of hepatitis is typically transmitted via the fecal-oral route?
A. Hepatitis B
C. Hepatitis C
C. Hepatitis A
D. Hepatitis D
Answer: C
Rationale: Hepatitis A is primarily transmitted through contaminated food or water via the
fecal-oral route, unlike B and C which are blood-borne.
7. A patient presents with sudden, severe epigastric pain radiating to the back,
elevated serum amylase, and lipase. What is the diagnosis?
A. Acute Cholecystitis
B. Appendicitis
C. Acute Pancreatitis
D. Gastroenteritis
Answer: C
Rationale: The clinical presentation of epigastric pain radiating to the back coupled with
elevated pancreatic enzymes (amylase and lipase) is diagnostic of acute pancreatitis.
8. What is the pathophysiologic hallmark of Ulcerative Colitis?
A. Granulomas throughout the ileum
B. Continuous inflammation of the colonic mucosa starting in the rectum
C. Malabsorption of Vitamin B12 in the terminal ileum
D. Fistula formation between the bowel and bladder
Answer: B
Rationale: Ulcerative Colitis is confined to the mucosa of the colon and rectum and
typically presents with continuous, non-skipped inflammation.
Chamberlain
1. A patient presents with heartburn and regurgitation that worsens after meals
and when lying down. What is the most likely pathophysiologic mechanism?
A. Hypersecretion of gastrin
B. Delayed gastric emptying due to pyloric stenosis
C. Autoimmune destruction of parietal cells
D. Inappropriate relaxation of the lower esophageal sphincter
Answer: D
Rationale: Gastroesophageal Reflux Disease (GERD) is primarily caused by the relaxation
of the lower esophageal sphincter (LES), allowing gastric contents to enter the esophagus.
2. Which organism is most frequently associated with the development of
chronic antral gastritis and peptic ulcer disease?
A. Helicobacter pylori
B. Escherichia coli
C. Staphylococcus aureus
D. Clostridium difficile
Answer: A
Rationale: H. pylori is a spiral-shaped bacterium that colonizes the gastric mucosa and is
the leading cause of chronic gastritis and peptic ulcers.
,3. A patient with Crohn’s disease is likely to exhibit which of the following
characteristics on a colonoscopy?
A. Continuous ulceration starting from the rectum
B. Superficial mucosal inflammation only
C. Pseudopolyps throughout the sigmoid colon
D. Skip lesions and transmural inflammation
Answer: D
Rationale: Crohn’s disease is characterized by ‘skip lesions’ (discontinuous areas of
inflammation) and involves the entire thickness of the intestinal wall (transmural).
4. Portal hypertension is most commonly a complication of which condition?
A. Cholecystitis
B. Acute pancreatitis
C. Liver cirrhosis
D. Duodenal ulcers
Answer: C
Rationale: Cirrhosis causes fibrosis and scarring of the liver tissue, which obstructs blood
flow and leads to increased pressure in the portal venous system.
5. What is the primary cause of hepatic encephalopathy in patients with liver
failure?
A. Accumulation of unconjugated bilirubin
B. Infection by Hepatitis B virus
C. Decreased production of albumin
D. Increased levels of systemic ammonia
Answer: D
Rationale: The liver normally converts ammonia to urea; when it fails, ammonia
accumulates in the blood and crosses the blood-brain barrier, causing neurotoxicity.
, 6. Which type of hepatitis is typically transmitted via the fecal-oral route?
A. Hepatitis B
C. Hepatitis C
C. Hepatitis A
D. Hepatitis D
Answer: C
Rationale: Hepatitis A is primarily transmitted through contaminated food or water via the
fecal-oral route, unlike B and C which are blood-borne.
7. A patient presents with sudden, severe epigastric pain radiating to the back,
elevated serum amylase, and lipase. What is the diagnosis?
A. Acute Cholecystitis
B. Appendicitis
C. Acute Pancreatitis
D. Gastroenteritis
Answer: C
Rationale: The clinical presentation of epigastric pain radiating to the back coupled with
elevated pancreatic enzymes (amylase and lipase) is diagnostic of acute pancreatitis.
8. What is the pathophysiologic hallmark of Ulcerative Colitis?
A. Granulomas throughout the ileum
B. Continuous inflammation of the colonic mucosa starting in the rectum
C. Malabsorption of Vitamin B12 in the terminal ileum
D. Fistula formation between the bowel and bladder
Answer: B
Rationale: Ulcerative Colitis is confined to the mucosa of the colon and rectum and
typically presents with continuous, non-skipped inflammation.
