Early Postoperative Transaminase Activities Affecting Early and Late Liver Graft Survival

Background. This study aimed to examine the effect of transaminases' activities in the first posttransplant day on early (90-day) and late (5-year) graft survival. Methods. This retrospective cohort study included 612 patients after liver transplantation (LT) in the period between 2015 and 2019. Patients with acute liver failure and with vascular complications after LT were excluded. The natural logarithms of alanine transaminase (ALT) and aspartate transaminase (AST) were used for analyses using the logistic regression and Cox proportional hazards regression models. The optimal cut-off point for transaminases was determined using receiver operating characteristic curves. The 5-year graft survival was calculated after previously excluding the patients with 90-day graft loss. Results. The ALT and AST were risk factors for 90-day graft loss (odds ratio 2.16; 95% CI 1.45-3.23; P < .001 and 2.23; 95% CI 1.55-3.19; P < .001, respectively). The optimal cut-off for ALT and AST in prediction of 90-day graft loss was & GE;1030 and & GE;3899 U/L; area under the curve 0.694 (95% CI 0.602-0.786; P < .001), with 11.3% and 97.1% positive predictive value (PPV) and negative predictive (NPV) value, and 0.673 (95% CI 0.575-0.772; P < .001), with 18.4% PPV and 95.6% NPV, respectively. The activities of AST and ALT on first posttransplant day were not identified as risk factors for late graft loss (P = .924 and P = .629, respectively). Conclusions. Early post-transplant transaminase activities can be used to determine early liver graft loss; however, their utility is lost for assessing the late graft survival.