Peptic Ulcer Disease I: Introduction

Peptic ulcer disease (PUD) involves mucosal erosion in the esophagus, stomach, pylorus, or duodenum. It manifests as acute or chronic ulcers. Acute ulcers show superficial erosion with minimal inflammation and heal quickly once the underlying cause is addressed. Chronic ulcers persist for months, potentially penetrating the muscular wall and forming fibrous tissue.

H. pylori is transmitted through contaminated food, water, or contact with stool, saliva, or vomit. Once ingested, the bacterium produces urease, which converts urea to ammonia to reduce stomach acidity. After establishing in the gastric mucosa, H. pylori triggers an immune response and releases toxins, resulting in mucosal inflammation and damage.

NSAIDs inhibit cyclooxygenase-1 (COX-1), an enzyme vital for prostaglandin production. Prostaglandins protect mucosal integrity, maintain mucus and bicarbonate secretion, support mucosal blood flow, and promote cell turnover and repair. Reduced prostaglandin levels from NSAIDs compromise these defense mechanisms, making the gastric mucosa more susceptible to damage from acid and pepsin.

Beyond NSAIDs, corticosteroids, bisphosphonates, potassium chloride, and fluorouracil are implicated in PUD. Smoking, chewing tobacco, and alcohol consumption irritate the gastric mucosa and induce acidity. Psychological distress impedes ulcer healing, while familial tendency and blood type O also increase susceptibility to peptic ulceration.

Zollinger-Ellison syndrome (ZES) is a rare condition involving benign or malignant tumors in the pancreas and duodenum that produce excessive gastrin hormone. This leads to high levels of gastric acid and severe peptic ulcer disease. ZES represents a significant etiology of PUD requiring specialized management approaches.

Acute ulcers are short-term with superficial erosion and minimal inflammation, healing quickly after the underlying cause is addressed. Chronic ulcers persist for months or longer, potentially penetrating the muscular wall and forming fibrous tissue. The depth of mucosal involvement and duration distinguish these two presentations of peptic ulcer disease.

Individuals with blood type O have increased density of colonization of epithelial cells by H. pylori and heightened inflammatory responses to the bacterium compared to those with blood types A, B, or AB. These factors contribute to elevated susceptibility to peptic ulceration and may influence disease severity and clinical manifestations and diagnostic studies.