Acute gastric mucosal injury during continuous or interrupted aspirin ingestion in humans.

The effect of continuous versus interrupted high-dose aspirin (ASA) for 14 days was evaluated in a randomized double-blind study in 8 rheumatoid arthritis patients. Acute gastric mucosal injury was measured by serial gastroscopy and gastric biopsy. Significant gross mucosal damage was seen in all patients following 3 days of ASA (P less than 0.01) and persisted without significant change in severity to the end of the study. Histologic gastritis in areas free of hemorrhages and erosions was not increased significantly by ASA. In spite of gross mucosal injury, symptoms occurred infrequently. Serum pepsinogen I, but not serum gastrin, increased significantly following 3 days of ASA, and the elevation persisted to the end of the study. The extent of mucosal injury at 14 days was not significantly different in those receiving ASA continuously from those on an interrupted schedule. Thus, gastric mucosal adaptation to ASA in man was not demonstrated.