[Pathogenesis of gastric and duodenal ulcer in the elderly].

In the elderly, H. pylori infection and nonsteroidal anti-inflammatory drug(NSAID) use are most important risk factors for peptic ulcer disease. It is now recognized that, in patients with H. pylori infection, nonatrophic antral-predominant gastritis results in increased acid secretion, which is seen in duodenal ulcer patients, whereas corpus-predominant gastritis and pangastritis result in decreased acid secretion, that are seen in patients with proximal gastric ulcer and gastric cancer. These physiological changes are considered to be related to disease outcome. On the other hand, NSAIDs induced gastrointestinal toxicity is primarily due to the inhibition of mucosal prostaglandin synthesis in the gastric mucosa, which subsequently impairs the gastric cytoprotective factors. These two factors may independently, or even synergistically, cause the development of peptic ulcer disease in the elderly.