[Protective effect of colloidal bismuth subcitrate on gastric mucosal lesion induced by aspirin]. 
This study was designed to investigate the protective effect of colloidal bismuth subcitrate (CBS) on aspirin-induced gastric mucosal lesion 20 patients with arthralgia were allocated into this study.  All of them were free of gastrointestinal symptom and their gastric mucosa were nearly normal under gastroendoscopic observation.  The first group of 10 patients received orally aspirin 1.5 qid for 4 days.  The second group also of 10 patients was treated with CBS 120 mg qid and after 2 days they received aspirin and CBS simultaneously in the dosage mentioned above for another 4 days.  Before and after treatment, the patients of both groups were examined endoscopically.  After treatment, the mucosal inflammation was much less in the second group than that in the first group.  The prostaglandin E2 concentration of antral mucosa in the first group was reduced significantly after administration of aspirin alone, while that in the second group was slightly increased after a combined treatment of aspirin and CBS.  The results demonstrate that CBS is an effective agent in prevention of gastric lesion induced by aspirin and prostaglandin E may be involved in this mucosal protective effect.