Objective:To study the relative risk factor of bleeding again of patients with obscure gastrointestinal bleeding (OGIB) of negative result in capsule endoscopy(CE). Methods: 92 patients with OGIB whose extermination results of CE were negative were enrolled in the retrospective analysis, and they were divided into observation group(46 cases, with bleeding again) and control group(46 cases, without bleeding again). The data of casehistory of these patients were compared, respectively, and then these data were analyzed by using Logistic regression analysis.Results: The ratio of 50 years old or older than 50 years old and the number of abnormal blood coagulation of observation group were significantly higher than that of control group(x2=5.386,x2=14.331,P<0.05), respectively. And the number of taking Aspirin of observation group was significantly higher than that of control group, while the number of received special treatment of observation group was lower than that of control group(x2=7.180, x2=23.545,P<0.01). As the results of Logistic regression analysis, 50 years old or older than 50 years old, abnormal blood coagulation, taking Aspirin and non-receiving special treatment were the independent risk factors, respectively, for patients with negative results of CE.Conclusion: In the examination of CE, although the results of patients with OGIB were negative, they may blood again, and all of these factors including 50 years old or older than 50 years old, abnormal blood coagulation, taking Aspirin and non-receiving special treatment are the risk factors which can affect blooding again. These factors should be paid more attention.

Patients with severe trauma require an extremely timely treatment and transfusion plays an irreplaceable role in the emergency treatment of such patients. An increasing number of evidence-based medicinal evidences and clinical practices suggest that patients with severe traumatic bleeding benefit from early transfusion of low-titer group O whole blood or hemostatic resuscitation with red blood cells, plasma and platelet of a balanced ratio. However, the current domestic mode of blood supply cannot fully meet the requirements of timely and effective blood transfusion for emergency treatment of patients with severe trauma in clinical practice. In order to solve the key problems in blood supply and blood transfusion strategies for emergency treatment of severe trauma, Branch of Clinical Transfusion Medicine of Chinese Medical Association, Group for Trauma Emergency Care and Multiple Injuries of Trauma Branch of Chinese Medical Association, Young Scholar Group of Disaster Medicine Branch of Chinese Medical Association organized domestic experts of blood transfusion medicine and trauma treatment to jointly formulate Chinese expert consensus on blood support mode and blood transfusion strategies for emergency treatment of severe trauma patients ( version 2024). Based on the evidence-based medical evidence and Delphi method of expert consultation and voting, 10 recommendations were put forward from two aspects of blood support mode and transfusion strategies, aiming to provide a reference for transfusion resuscitation in the emergency treatment of severe trauma and further improve the success rate of treatment of patients with severe trauma.