[Risk and crisis management by anesthesiologists regarding 'Guidelines for Actions Against Intraoperative Critical Hemorrhage' published by the Japanese Society of Anesthesiologists and the Japan Society of Transfusion Medicine and Cell Therapy].

According to a survey of anesthesia-related critical incidents by the Japanese Society of Anesthesiologists, hemorrhage was the major cause of cardiac arrest developing in the operating room. To deal with critical hemorrhage swiftly, not only cooperation between anesthesiologists and surgeons but also the linkage of operating rooms with transfusion management divisions and the blood center is important. It is desirable for the hospital transfusion committee to prepare hospital regulations on 'actions to be taken to manage critical hemorrhage', and practice the implementation of these guidelines by simulated drills. When critical hemorrhage occurs, a person in charge is appointed, and an emergency is declared (call for manpower and notification of the emergency to the transfusion management divisions). A person in charge comprehensively assesses the hemostatic condition, hemodynamics, laboratory data, and blood product supply system, and consults the operator regarding the continuation of surgery or changing surgical procedures. When time is short, the cross-matching test is omitted, and the ABO-identical blood is used. When a supply of the identical ABO-type blood is not available, compatible blood type is used. The evolving concept of hemostatic resuscitation seems to be important to prevent coagulopathy, which easily develops during massive hemorrhage. Anesthesiologists should be aware of the risk of such an emergency transfusion and procedures to be taken to switch to transfusion of the ABO-identical blood. Establishment of a hospital emergency transfusion system depends on the overall capability of the critical and crisis management systems of the hospital.