Blood Products Transfusion in Cardiac Surgery After the Implementation of a Coagulation Monitoring System at Patient Bedside: Thromboelastometry Versus Standard Transfusion Protocol

Main objective: Determine whether by introducing thromboelastograph, the investigators reduced the number of packed red cells received by each patient (median) compared to the usual protocol, in which the indication for transfusion is based on laboratory tests: Prothrombin time, time activated partial thromboplastin time, thrombin, reptilase, fibrinogen and platelet contage. Design: Prospective randomized controlled trial and single blinded. Disease or disorder under study: Study of coagulopathy in patients undergoing cardiac surgery with cardiopulmonary bypass (CPB). Primary endpoint: median transfusion of packed red blood cells per patient. Study population Male and female patients over 18 years undergoing cardiac surgery with cardiopulmonary bypass to bleed excessively. Duration of treatment: The coagulation monitoring methods tested are made from protamine administration to CEC output if a) the patient bleeds diffusely, or b) from arrival in the unit if not satisfied critics a) bleed excessively drains and until the patient stops bleeding (debit drains \<a 150ml / h).