Reflux & Repairs
Patient with persistent reflux symptoms but normal endoscopy and positive pH study.
What is the diagnosis?
Non-erosive reflux disease (NERD)
Patient with pancreatitis has normal amylase but elevated lipase.
Why can amylase be normal?
Shorter half-life and less specificity; may normalize earlier
Patient has elevated WBC with neutrophil predominance but normal absolute lymphocyte count.
What concept explains this?
Relative vs absolute values (percentage misleading)
Why can H. pylori survive in the acidic stomach environment?
Urease converts urea → ammonia, buffering acid
Patient with suspected acute pancreatitis presents early.
Most important initial management priority?
Aggressive IV fluid resuscitation
What are the four components required for decision-making capacity?
Understanding, appreciation, reasoning, communication
Patient with reflux symptoms unresponsive to PPIs after bariatric surgery. Endoscopy shows bile in esophagus.
What is the underlying mechanism?
Duodenogastroesophageal (bile) reflux due to altered anatomy
Gallstone pancreatitis causes both elevated lipase, alkaline phosphatase, and bilirubin.
What is the anatomical explanation?
Transient obstruction at the ampulla of Vater affecting both bile and pancreatic ducts
Why is H. pylori serology a poor test for confirming eradication?
IgG antibodies persist long after infection clears
What type of inflammation does H. pylori induce that predisposes to malignancy?
Chronic lymphocytic (mononuclear) inflammation
Patient with gallstone pancreatitis stabilizes clinically.
Next definitive step to prevent recurrence?
Cholecystectomy during same hospitalization
Patient with intellectual disability agrees to surgery but lacks capacity.
What is this called?
Assent
Why does bile reflux cause more severe mucosal injury than acid alone?
Bile salts disrupt cell membranes and, when combined with acid, increase epithelial permeability and inflammation
Patient with RUQ pain, fever, hypotension, jaundice, and confusion.
What condition and severity classification?
Ascending cholangitis with Reynolds pentad (severe)
Patient with suspected infection has negative antibody-based tests but clinical suspicion remains high.
What is the underlying issue?
Impaired humoral immunity (e.g., CVID)
Why does eradication of H. pylori lead to regression of early MALT lymphoma?
Removes antigenic stimulation driving B-cell proliferation
Patient with suspected cholangitis.
Most urgent intervention?
Biliary decompression (ERCP)
Why is “frequent ED user” labeling dangerous in clinical care?
Introduces cognitive bias → diagnostic anchoring and premature closure
A patient with Barrett’s esophagus has biopsy showing low-grade dysplasia.
What is the next best management?
Endoscopic eradication therapy (e.g., radiofrequency ablation)
Why might ultrasound miss early acute cholecystitis?
Operator dependence and absence of early wall thickening or pericholecystic fluid
Patient with elevated alkaline phosphatase—how do you confirm hepatobiliary origin?
Check GGT (gamma-glutamyl transferase)
Patient has negative stool antigen but high suspicion for H. pylori.
What medication could cause a false negative?
Proton pump inhibitors (PPIs)
Patient with suspected MALT lymphoma and negative H. pylori serology.
Next diagnostic step?
Endoscopic biopsy ± PCR-based testing
Patient cannot provide history and no guardian is available.
What ethical principle guides urgent care?
Implied consent
Why does Roux-en-Y gastric bypass improve reflux compared to OAGB?
It separates the biliopancreatic limb from the gastric pouch, preventing bile from reaching the esophagus
Patient with pancreatitis develops hypocalcemia.
What is the mechanism?
Fat necrosis → saponification → calcium sequestration
Why might a patient with CVID have false-negative viral serologies?
Inability to mount antibody response → serology unreliable; PCR needed
What is the pathophysiologic link between chronic H. pylori infection and gastric adenocarcinoma?
Chronic inflammation → atrophy → intestinal metaplasia → dysplasia → carcinoma
Patient with immunodeficiency and recurrent infections.
Long-term management?
IVIG replacement therapy
What is the key ethical tension when treating adults with intellectual disability?
Balancing autonomy with beneficence (respect vs protection)