NURS 5315 ADVANCED PATHOPHYSIOLOGY GI MODULE 9
EXAM 5 2026/2027 | 100% Correct Answers | Updated Version
| Score A+ | Pass Guaranteed
Section 1: Upper GI Disorders (Esophagus & Stomach) (Questions 1-20)
Q1: Which pathophysiological mechanism is the primary driver of gastroesophageal
reflux disease (GERD) in the majority of patients, particularly during periods of transient
lower esophageal sphincter (LES) relaxation?
A. Increased gastric acid secretion leading to overwhelming mucosal capacity
B. Transient LES relaxations (TLESRs) mediated by vagal afferents and the dorsal
motor nucleus
C. Anatomical disruption of the diaphragmatic crura preventing esophageal clearance
D. Helicobacter pylori-induced gastritis increasing intragastric pressure
Correct Answer: B
Rationale: According to ACG guidelines and Robbins & Cotran pathophysiology,
TLESRs unrelated to swallowing are the most common mechanism underlying GERD,
allowing acid to reflux when the sphincter momentarily fails; distractors A and D
misattribute primary causes, while C describes hiatal hernia rather than the universal
primary driver.
Q2: A 58-year-old male with chronic GERD undergoes an upper endoscopy with biopsy.
The pathologist's report notes "intestinal metaplasia characterized by the presence of
goblet cells replacing the normal esophageal squamous epithelium." What is the
primary clinical significance of this histopathological finding?
A. It confirms the diagnosis of erosive esophagitis requiring high-dose proton pump
inhibitor therapy
B. It indicates Barrett's esophagus, a premalignant condition carrying an increased risk
for adenocarcinoma
C. It suggests H. pylori infection has migrated from the antrum to the distal esophagus
D. It represents a benign inflammatory response that will resolve with lifestyle
modifications
Correct Answer: B
Rationale: ASGE guidelines identify the replacement of squamous epithelium with
intestinal goblet cells (intestinal metaplasia) as the hallmark of Barrett's esophagus, the
primary precursor lesion to esophageal adenocarcinoma; distractor A confuses
metaplasia with erosions, C misidentifies the pathology, and D incorrectly assumes
metaplasia is reversible.
,Q3: A 42-year-old female presents with progressive dysphagia to both solids and
liquids, regurgitation of undigested food at night, and occasional chest pain. A barium
esophagram reveals a dilated proximal esophagus tapering to a "bird beak" appearance
at the gastroesophageal junction. Manometry would most likely show which of the
following?
A. Absent peristalsis and failure of the lower esophageal sphincter to relax with
swallowing
B. Intermittent, high-amplitude, prolonged peristaltic contractions in the distal
esophagus
C. Hypotensive lower esophageal sphincter with normal proximal peristalsis
D. Weak, ineffective peristalsis with incomplete LES relaxation
Correct Answer: A
Rationale: Kumar & Clark's Clinical Medicine defines achalasia by the degeneration of
inhibitory neurons (NO and VIP) in the myenteric plexus, causing absent peristalsis and
incomplete LES relaxation; distractor B describes diffuse esophageal spasm, C
describes scleroderma esophagus, and D describes ineffective esophageal motility.
Q4: A patient with systemic sclerosis (scleroderma) presents with severe heartburn and
dysphagia. Esophageal manometry is ordered. Compared to achalasia, which
manometric finding is most characteristic of scleroderma esophagus?
A. High-pressure LES with failure to relax
B. Absent peristalsis in the smooth muscle portion with a severely hypotensive LES
C. "Corkscrew" esophagus with normal LES tone
D. Hypercontractile esophagus (jackhammer esophagus) with elevated integrated
relaxation pressure
Correct Answer: B
Rationale: Robbins & Cotran outlines that scleroderma causes smooth muscle atrophy
and fibrosis of the distal two-thirds of the esophagus, leading to absent peristalsis
combined with a hypotensive LES that fails to prevent reflux, directly contrasting
achalasia's hypertensive, non-relaxing LES.
Q5: A 55-year-old patient presents with intermittent, non-progressive dysphagia to solid
foods only. An upper endoscopy reveals a concentric, smooth mucosal ring near the
gastroesophageal junction. What is the most likely diagnosis?
A. Zenker's diverticulum
B. Schatzki's ring
C. Esophageal squamous cell carcinoma
D. Barrett's esophagus with stricture
Correct Answer: B
Rationale: ACG guidelines state that a Schatzki's ring is a concentric mucosal ring at
the squamocolumnar junction causing intermittent solid-food dysphagia; distractor A
, causes regurgitation and halitosis, C presents with progressive dysphagia and weight
loss, and D requires a history of chronic GERD and Barrett's histology.
Q6: An 80-year-old patient complains of halitosis, dysphagia, and regurgitation of
undigested food eaten hours earlier, which improves when the neck is manipulated.
Which structural disorder is most consistent with this presentation?
A. Esophageal achalasia
B. Killian-Jamieson diverticulum
C. Zenker's diverticulum
D. Pharyngoesophageal (Zenker's) diverticulum arising above the cricopharyngeus
muscle
Correct Answer: D
Rationale: Kumar & Clark describes Zenker's diverticulum as a pulsion diverticulum
through Killian's triangle (above the cricopharyngeus) causing putrefaction of trapped
food, halitosis, and regurgitation; the distractors include achalasia (motility) and other
rare structural variants, while D provides the precise anatomical pathophysiology.
Q7: A 45-year-old patient with chronic alcohol use presents with severe epigastric pain,
nausea, and hematemesis. Endoscopy reveals multiple erosions in the gastric body and
fundus without deep ulceration. What is the primary pathophysiological mechanism of
this acute mucosal injury?
A. H. pylori-induced chronic inflammatory cytokine release
B. Prostaglandin inhibition leading to decreased mucosal bicarbonate and mucus
secretion
C. Autoimmune destruction of parietal cells reducing acid barrier
D. Enhanced gastric motility causing mechanical mucosal tearing
Correct Answer: B
Rationale: Robbins & Cotran explains that alcohol and NSAIDs inhibit cyclooxygenase-1
(COX-1), reducing prostaglandin synthesis, which is essential for maintaining mucosal
blood flow, mucus, and bicarbonate secretion, leading to acute erosive gastritis;
distractor A causes chronic gastritis, C causes atrophic gastritis, and D describes
Mallory-Weiss tears.
Q8: A 60-year-old female presents with fatigue, glossitis, and paresthesias. Laboratory
tests reveal a hemoglobin of 9.2 g/dL, MCV of 110 fL, and low serum vitamin B12.
Autoantibodies against intrinsic factor and parietal cells are positive. What type of
chronic gastritis underlies this condition?
A. Type B chronic gastritis
B. Type A chronic gastritis
C. H. pylori-associated hypertrophic gastritis
D. Lymphocytic gastritis
EXAM 5 2026/2027 | 100% Correct Answers | Updated Version
| Score A+ | Pass Guaranteed
Section 1: Upper GI Disorders (Esophagus & Stomach) (Questions 1-20)
Q1: Which pathophysiological mechanism is the primary driver of gastroesophageal
reflux disease (GERD) in the majority of patients, particularly during periods of transient
lower esophageal sphincter (LES) relaxation?
A. Increased gastric acid secretion leading to overwhelming mucosal capacity
B. Transient LES relaxations (TLESRs) mediated by vagal afferents and the dorsal
motor nucleus
C. Anatomical disruption of the diaphragmatic crura preventing esophageal clearance
D. Helicobacter pylori-induced gastritis increasing intragastric pressure
Correct Answer: B
Rationale: According to ACG guidelines and Robbins & Cotran pathophysiology,
TLESRs unrelated to swallowing are the most common mechanism underlying GERD,
allowing acid to reflux when the sphincter momentarily fails; distractors A and D
misattribute primary causes, while C describes hiatal hernia rather than the universal
primary driver.
Q2: A 58-year-old male with chronic GERD undergoes an upper endoscopy with biopsy.
The pathologist's report notes "intestinal metaplasia characterized by the presence of
goblet cells replacing the normal esophageal squamous epithelium." What is the
primary clinical significance of this histopathological finding?
A. It confirms the diagnosis of erosive esophagitis requiring high-dose proton pump
inhibitor therapy
B. It indicates Barrett's esophagus, a premalignant condition carrying an increased risk
for adenocarcinoma
C. It suggests H. pylori infection has migrated from the antrum to the distal esophagus
D. It represents a benign inflammatory response that will resolve with lifestyle
modifications
Correct Answer: B
Rationale: ASGE guidelines identify the replacement of squamous epithelium with
intestinal goblet cells (intestinal metaplasia) as the hallmark of Barrett's esophagus, the
primary precursor lesion to esophageal adenocarcinoma; distractor A confuses
metaplasia with erosions, C misidentifies the pathology, and D incorrectly assumes
metaplasia is reversible.
,Q3: A 42-year-old female presents with progressive dysphagia to both solids and
liquids, regurgitation of undigested food at night, and occasional chest pain. A barium
esophagram reveals a dilated proximal esophagus tapering to a "bird beak" appearance
at the gastroesophageal junction. Manometry would most likely show which of the
following?
A. Absent peristalsis and failure of the lower esophageal sphincter to relax with
swallowing
B. Intermittent, high-amplitude, prolonged peristaltic contractions in the distal
esophagus
C. Hypotensive lower esophageal sphincter with normal proximal peristalsis
D. Weak, ineffective peristalsis with incomplete LES relaxation
Correct Answer: A
Rationale: Kumar & Clark's Clinical Medicine defines achalasia by the degeneration of
inhibitory neurons (NO and VIP) in the myenteric plexus, causing absent peristalsis and
incomplete LES relaxation; distractor B describes diffuse esophageal spasm, C
describes scleroderma esophagus, and D describes ineffective esophageal motility.
Q4: A patient with systemic sclerosis (scleroderma) presents with severe heartburn and
dysphagia. Esophageal manometry is ordered. Compared to achalasia, which
manometric finding is most characteristic of scleroderma esophagus?
A. High-pressure LES with failure to relax
B. Absent peristalsis in the smooth muscle portion with a severely hypotensive LES
C. "Corkscrew" esophagus with normal LES tone
D. Hypercontractile esophagus (jackhammer esophagus) with elevated integrated
relaxation pressure
Correct Answer: B
Rationale: Robbins & Cotran outlines that scleroderma causes smooth muscle atrophy
and fibrosis of the distal two-thirds of the esophagus, leading to absent peristalsis
combined with a hypotensive LES that fails to prevent reflux, directly contrasting
achalasia's hypertensive, non-relaxing LES.
Q5: A 55-year-old patient presents with intermittent, non-progressive dysphagia to solid
foods only. An upper endoscopy reveals a concentric, smooth mucosal ring near the
gastroesophageal junction. What is the most likely diagnosis?
A. Zenker's diverticulum
B. Schatzki's ring
C. Esophageal squamous cell carcinoma
D. Barrett's esophagus with stricture
Correct Answer: B
Rationale: ACG guidelines state that a Schatzki's ring is a concentric mucosal ring at
the squamocolumnar junction causing intermittent solid-food dysphagia; distractor A
, causes regurgitation and halitosis, C presents with progressive dysphagia and weight
loss, and D requires a history of chronic GERD and Barrett's histology.
Q6: An 80-year-old patient complains of halitosis, dysphagia, and regurgitation of
undigested food eaten hours earlier, which improves when the neck is manipulated.
Which structural disorder is most consistent with this presentation?
A. Esophageal achalasia
B. Killian-Jamieson diverticulum
C. Zenker's diverticulum
D. Pharyngoesophageal (Zenker's) diverticulum arising above the cricopharyngeus
muscle
Correct Answer: D
Rationale: Kumar & Clark describes Zenker's diverticulum as a pulsion diverticulum
through Killian's triangle (above the cricopharyngeus) causing putrefaction of trapped
food, halitosis, and regurgitation; the distractors include achalasia (motility) and other
rare structural variants, while D provides the precise anatomical pathophysiology.
Q7: A 45-year-old patient with chronic alcohol use presents with severe epigastric pain,
nausea, and hematemesis. Endoscopy reveals multiple erosions in the gastric body and
fundus without deep ulceration. What is the primary pathophysiological mechanism of
this acute mucosal injury?
A. H. pylori-induced chronic inflammatory cytokine release
B. Prostaglandin inhibition leading to decreased mucosal bicarbonate and mucus
secretion
C. Autoimmune destruction of parietal cells reducing acid barrier
D. Enhanced gastric motility causing mechanical mucosal tearing
Correct Answer: B
Rationale: Robbins & Cotran explains that alcohol and NSAIDs inhibit cyclooxygenase-1
(COX-1), reducing prostaglandin synthesis, which is essential for maintaining mucosal
blood flow, mucus, and bicarbonate secretion, leading to acute erosive gastritis;
distractor A causes chronic gastritis, C causes atrophic gastritis, and D describes
Mallory-Weiss tears.
Q8: A 60-year-old female presents with fatigue, glossitis, and paresthesias. Laboratory
tests reveal a hemoglobin of 9.2 g/dL, MCV of 110 fL, and low serum vitamin B12.
Autoantibodies against intrinsic factor and parietal cells are positive. What type of
chronic gastritis underlies this condition?
A. Type B chronic gastritis
B. Type A chronic gastritis
C. H. pylori-associated hypertrophic gastritis
D. Lymphocytic gastritis
