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Recently, antisecretory drugs such as H2-receptor antagonists (H2-RA) or proton pump inhibitor have been used for peptic ulcer patients widely in Japan. However, there are possibilities that long term administration of H2-RA might cause changes in intragastric environment. The present study was designed to clarify the changes of surgical treatment in Japan Surgical Society training hospitals, before and after introduction of H2-RA. Serum gastrin and antral G-cell number was measured after administration of H2-RA (1 mg/kg 14 days continuous infusion) in rat. Also, acid secretion and gastrin response stimulated by adrenalin (40 ng/kg.min) were measured in duodenal ulcer patients. 1) In the view of surgical treatment, elective operation highly decreased after the introduction of H2-receptor antagonists, and showed the increase of the rate of emergency operation up to 70%. 2) Hypergastrinemia and antral G cell hyperplasia were observed after administration of H2-RA in rats. 3) Acid secretion stimulated by adrenalin which is considered as antral G cell dependent, showed a higher response in H2-RA treated cases than in those untreated. 4) Antrectomy was carried out in 43.4% of the patients treated with H2-RA versus 18.9% to the patients untreated.
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