Clinical complications (infectious or otherwise) related to transfusion of caps Red Blood cells Caps (RBC)are well known. Many studies seem to evidence the potentially deleterious effect of transfusion, especially in patients with poor condition, related to storage time. Indeed, during storage, impaired blood-related storage is created. It is metabolic, biochemical and molecular levels. Many studies, carried out in particular in cardiac surgery where patients are suitable for transfusion RBC, have focused on the effect of transfusions on consumption and the transport of oxygen to demonstrate the impact of conservation lesions on their role in vivo. In particular, a single-center retrospective American study showed reduction of postoperative complications in patients who received RBC under 14 days.