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Combined use of fibrin glue and polyglycolic acid (PGA) sheets has attracted attention as a preventive measure for complications associated with endoscopic submucosal dissection. However, fibrin glue is a protein that may be dissolved by gastric acid. We evaluated the effect of artificial gastric acid on fibrin clot. The dissolution time of three layers of fibrin glue with PGA sheets was measured in five groups (pH 1.2, 2.0, 4.0, 5.5, and 6.0 with pepsin). Measurements of three samples per group were made. The mean number of the remaining layers at each measurement point was observed for 168 h. The time to complete dissolution of the three layers of fibrin gel in the three samples was 2.5 h at pH 1.2, 5 h at pH 2.0, 24 h at pH 4.0, and 48 h and 6 h at pH 5.5. In order to maintain fibrin glue in the stomach for a long period, there was a need to avoid pepsin activation secondary to acidification of gastric juice. The use of strong antacids is recommended.

The importance of pH adjustment for preventing fibrin glue dissolution in the stomach: an in vitro study