Do non-steroidal anti-inflammatory drugs cause duodenal ulcer? Evaluation of basal acid output and ulcer complications.

Non-steroidal anti-inflammatory drug (NSAID) use and basal acid outputs determined by nasogastric suction were evaluated prospectively in 184 patients with endoscopically documented duodenal ulcer. The mean basal acid output and percentage of gastric acid hypersecretion for duodenal ulcer patients who used NSAID were compared with duodenal ulcer patients who did not use NSAID to determine whether patients using NSAID who develop duodenal ulcer have basal acid outputs in the normal range or in the duodenal ulcer range. Results were compared with 65 normal subjects and 105 patients with nonulcer dyspepsia. There were no significant differences with regard to the percentage of male gender, mean age, mean basal acid output, percentage of gastric acid hypersecretion and percentage of cigarette smoking history between duodenal ulcer patients who used NSAID and duodenal ulcer patients who did not. However, significant differences were observed between duodenal ulcer patients who used NSAID and duodenal ulcer patients who did not use NSAID with regard to the percentage of bleeding duodenal ulcer (59 compared with 23%; p = 0.0008) and the percentage of patients with giant duodenal ulcer (41 compared with 5%; P = 0.00001). These results suggest that NSAID use does not cause duodenal ulcer but does make pre-existing duodenal ulcer worse by causing duodenal ulcer complications.