Super‐massive transfusion during liver transplantation

Abstract Background Massive hemorrhage and transfusion during liver transplantation (LT) present great challenges. We aimed to investigate the incidence and risk factors for super‐massive transfusion (SMT) and survival outcome and factors that negatively affect survival in patients who received SMT during LT. Study Design and Methods We included adult patients undergoing LT from 2004 to 2019. SMT was defined as transfusion of ≥50 units of red blood cells (RBC) during LT. Independent risk factors were identified by multivariable logistic regression. Ninety‐day survival was recorded and factors that negatively affected survival were analyzed by the Cox survival test. Results Of 2772 patients, 158 (5.6%) received SMT during LT. Mean RBC transfusion was 72.6 (±23.4) units with a maximum of 168 units. Four variables (MELD‐Na score, previous upper abdominal surgery, portal vein thrombosis, and remote retransplant) were independent risk factors for SMT (odds ratio 1.800–8.274, 95% CI 1.008–16.685, all p  < .005). The 90‐day survival rate in SMT patients was 81.6%. Preoperative pulmonary hypertension and massive postreperfusion transfusion negatively affected 90‐day survival (hazard ratio 2.658–4.633, 95% CI 1.144–10.130, and all p  < .05). Conclusions In this large retrospective study, we found that SMT occurred in a small percentage of patients and was associated with relatively satisfactory short‐term survival. Identification of preoperative risk factors for SMT and factors that negatively affect survival improve our understanding of this unique LT patient population.