early endoscopy Presenting Author: HIROSHI KANIE Additional Authors: SATOSHI NOMURA, ISSEI KOJIMA, YU NOJIRI, TAKASHI YOSHIMINE, YASUAKI FUJITA, ATSUNORI KUSAKABE, TESSHIN BAN, TOMONORI YAMADA, KATSUMI HAYASHI, ETSURO ORITO Corresponding Author: HIROSHI KANIE Affiliations: Nagoya Daini Red Cross Hospital, Nagoya Daini Red Cross Hospital, Nagoya Daini Red Cross Hospital, Nagoya Daini Red Cross Hospital, Nagoya Daini Red Cross Hospital, Nagoya Daini Red Cross Hospital, Nagoya Daini Red Cross Hospital, Nagoya Daini Red Cross Hospital, Nagoya Daini Red Cross Hospital, Nagoya Daini Vadimezan molecular weight Red Cross Hospital Objective: In July

2012, the Japan Gastroenterological Endoscopy Society (JSGE) published guidelines for gastroenterological endoscopy in patients undergoing antithrombotic treatment. (Digestive endoscopy 2014;26:1–14) The new edition of the guidelines (GL) includes discussions of gastroenterological hemorrhage associated with continuation of antithrombotic therapy, as well as thromboembolism associated with withdrawal of antithrombotic therapy. The aim

of this study is to clarify postoperative hemorrhage undergoing antithrombotic treatment. Methods: In a retrospective review of our database prospectively collected data between July 2011 and June 2013 (two years), we resected endoscopically colorectal tumors, total 1175 cases 2198 lesions. We compared the rate of postoperative hemorrhage between endoscopic treatment within the new guidelines (New GL group: 164 Fulvestrant MCE lesions),and within the old guidelines (Old GL group: 199 lesions),and undergoing no antithrombotic therapy (No medication group: 1834 lesions). We evaluated for risk factor of postoperative hemorrhage

after endoscopic treatment of colorectal tumors. Results: The lesions undergoing antithrombotic treatment were 363 lesions (16.6%). The rate of postoperative hemorrhage was 1.8%(3/164) in New GL group, 1.5%(3/199) in Old GL group, 0.60%(11/1834) in No medication group, and there were no significant defference. It was 1.4%(1/73) in continuation of aspirin, 0.8%(1/128) in withdrawal of aspirin, and there were no significant defference. The risk factor of postoperative hemorrhage was location (rectum), size (over 10 mm), pathological finding (cancer) and antithrombotic therapy (+) by univariate analysis. The significant independent risk factor of postoperative hemorrhage was size (odd ratio 14.80[95 % CI 3.22–67.96], p = 0.001), location(odd ratio 3.46[95 % CI 1.25–9.61], p = 0.017) and antithrombotic therapy(odd ratio2.96[95 % CI 1.07–8.21], p = 0.037) by multivariate analysis. Conclusion: The rate of postoperative hemorrhage is not increased by compliance of new guidelines, and it is reasonable to observe the new guidelines. Key Word(s): 1. postoperative hemorrhage; 2. antithrombotic treatment; 3.