Prediction of Postoperative Blood Loss Using Thromboelastometry in Adult Cardiac Surgery: Cohort Study and Systematic Review.

ABSTRACT

OBJECTIVE: The aim was to evaluate the predictive value of thromboelastometry for postoperative blood loss in adult cardiac surgery with cardiopulmonary bypass. DESIGN: Retrospective cohort study and systematic review of the literature. SETTING: A tertiary university hospital. PARTICIPANTS: 202 patients undergoing elective cardiac surgery. INTERVENTIONS: Thromboelastometry was performed before cardiopulmonary bypass and 3 minutes after protamine administration. MEASUREMENTS AND MAIN RESULTS: The cohort study showed that the preoperative and postoperative thromboelastometric positive predicting value was poor (0%-22%); however, the negative predicting value was high (89%-94%). The systematic review of the literature to evaluate the predictive value of thromboelastometry for major postoperative bleeding in cardiac surgery resulted in 1,311 articles, 11 of which were eligible (n = 1,765; PubMed and Embase, until June 2016). Two studies found a good predictive value, whereas the other 9 studies showed a poor predictability for major postoperative bleeding after cardiac surgery. The overall negative predicting value was high. CONCLUSIONS: Thromboelastometry does not predict which patients are at risk for major postoperative bleeding.