Transfusion Using Stored Whole Blood

Overview

Massive hemorrhage is a major cause of potentially preventable death following trauma. A common consequence of hemorrhagic shock is uncontrollable bleeding from coagulopathy, leading to death from exsanguination. Even when bleeding is controlled, patients are at increased risk of complications and mortality. Reconstituted whole blood, or component therapy with packed red blood cells (PRBCs), plasma, and platelets was introduced by the military in recent conflicts in Iraq and Afghanistan with remarkable results and has been adopted by most civilian trauma centers. Despite improving coagulopathy, it is apparent that transfusion of blood components is not equivalent to whole blood transfusion. Transfusion of high plasma volumes may be associated with increased risk of allergic reaction, transfusion associated acute lung injury (TRALI), hypervolemic cardiac failure, and acute respiratory distress syndrome (ARDS). Military services have recently reintroduced fresh whole blood (WB) for standard resuscitation of massive hemorrhage, have found that WB offers a survival advantage over component therapy, and that risks of transfusion reactions are similar for WB and PRBCs. On the civilian side, whole blood is an FDA-licensed product that has been in use in pediatric open heart surgery and autologous blood donation but is no longer commonly available for other indications. However, the military results are renewing interest in whole blood for trauma resuscitation. The use of low-antibody titer whole blood leukoreduced with a platelet-sparing filter was recently approved by the University of California Los Angeles Blood and Blood Derivatives Committee and two other trauma centers for male trauma patients. This study will test the feasibility of providing stored WB for resuscitation of patients in hemorrhagic shock and determine the effects of WB on clinical outcomes as well as the effects on coagulation, fibrinolysis, and inflammation, compared to standard blood component therapy.

Most current massive transfusion protocols attempt to treat the early coagulopathic state induced by severe injury and hemorrhagic shock with transfusion of red blood cells, plasma, and platelets in a 1:1:1 ratio replicating whole blood. Civilian trauma centers have now begun to initiate resuscitation of adult male patients with stored whole blood as a standard of care, however. The main hypothesis behind this change in practice is that transfusion of whole blood (WB) rather than attempted reconstitution from its banked components is safer, more efficient and effective treatment of hemorrhagic shock following injury and will result in less frequent development of clinical coagulopathy and subsequent mortality. Whole blood offers the advantages of more precisely approximating shed blood; decreased volume of additives per unit; and exposure to a decreased number of donors for a patient undergoing massive transfusion. It remains to be seen whether this will translate into differences in coagulopathy, inflammation, and mortality. The purpose of this study is to investigate the feasibility of developing a system to collect, store, and deliver whole blood for trauma resuscitations in a civilian trauma center. The universal donor blood type for patients with unknown blood type is type O positive blood for males and O negative for females. Because O negative blood is rare the study will initiate the change in practice in adult male patients and later extend it to female patients if feasible. The study will determine the effects of WB transfusion in adult male patients compared to transfusion of PRBCS, plasma, and platelets in a 1:1:1 ratio in non adult male patients on markers of coagulation, fibrinolysis, and inflammation, as well as the development of complications and hospital mortality following severe injury. Specific aims are to: 1. Determine the appropriate shelf life of WB that has been leukoreduced with a platelet sparing filter by measuring changes in levels of coagulation factors and global clotting potential of banked units over time. To accomplish this the investigators will measure variables known to reflect potential and actual clotting capacity including platelet function and overall clotting ability by thromboelastography (TEG) and thrombin generation analysis in whole blood up to 35 days. 2. Prospectively determine the effectiveness of trauma resuscitation using WB compared to component therapy and its effects on variables known to reflect potential and actual clotting capacity including markers of coagulation, fibrinolysis, inflammation, platelet function and global hemostatic potential post transfusion, as well as hospital outcomes including development of coagulopathy, infection, venous thromboembolism (VTE), multiple organ failure (MOF), total transfusion requirements, and mortality. 3. Test the feasibility and implementation of a system to provide WB for resuscitation of trauma patients in hemorrhagic shock in civilian trauma centers. This will be accomplished by monitoring cost, storage needs, frequency of blood collection, number of donors, inventory, utilization and wastage of unused units.