A 49-year-old man reports epigastric abdominal pain, early satiety, and fullness following a meal. The nurse practitioner suspects peptic ulcer disease (PUD). What is the pathophysiology underlying this disease process?

Choice A reason: These factors are associated with irritable bowel syndrome and other colonic disorders, not peptic ulcer disease. PUD affects the stomach and duodenum, not the colon. Choice B reason: This describes the pathophysiology of inflammatory bowel diseases such as ulcerative colitis and Crohn’s disease. It does not apply to PUD, which is primarily driven by gastric acid and mucosal injury. Choice C reason: PUD results from an imbalance between aggressive factors (e.g., gastric acid, pepsin, H. pylori, NSAIDs) and protective mechanisms (e.g., mucus, bicarbonate, mucosal blood flow). H. pylori disrupts mucosal defenses, and NSAIDs inhibit prostaglandin synthesis, both contributing to ulcer formation. Choice D reason: LES dysfunction and TLESRs are associated with gastroesophageal reflux disease (GERD), not PUD. GERD involves reflux of gastric contents into the esophagus, whereas PUD involves mucosal erosion in the stomach or duodenum.