Thromboelastography after Cardiopulmonary Bypass: Does it Save Blood Products?

INTRODUCTION: This study aimed to determine if thromboelastography (TEG) is associated with reduced blood product use and surgical reintervention following cardiopulmonary bypass (CPB) compared to traditional coagulation tests. METHODS: A retrospective review was conducted of 698 patients who underwent CPB at a tertiary-care, community-based, university-affiliated hospital from February 16, 2014 to February 16, 2015 (Period I) and from May 16, 2015 to May 16, 2016 (Period II). Traditional coagulation tests guided transfusion during Period I and TEG guided transfusion during Period II. Intraoperative and postoperative administration of blood products (red blood cells, fresh frozen plasma, platelets, and cryoprecipitate), reoperation for hemorrhage or graft occlusion, duration of mechanical ventilation, hospital length of stay, and mortality were recorded. RESULTS: Use of a TEG-directed algorithm was associated with a 13.5% absolute reduction in percentage of patients requiring blood products intraoperatively (48.2% vs. 34.7%, p < 0.001). TEG resulted in a 64.3% and 43.1% reduction in proportion of patients receiving fresh frozen plasma (FFP) and platelets, respectively, with a 50% reduction in volume of FFP administered (0.3 vs. 0.6 units, p < 0.001). Use of TEG was not observed to decrease postoperative blood product usage or mortality significantly. The median length of hospital stay was reduced by one day after TEG guided transfusion was implemented (nine days vs. eight days, p = 0.01). CONCLUSIONS: Use of TEG-directed transfusion of blood products following CPB appeared to decrease the need for intraoperative transfusions, but the effect on clinical outcomes has yet to be clearly determined.