313.6: Early Graft Disfunction After Hypothermic Oxygenated Machine Perfusion of ECD Criteria Liver Grafts: No Longer A Clinical Issue?

Introduction: Early allograft disfunction (EAD) continues to be an important issue in liver transplantation, varying from 15 to 30%. This rate is particularly high in case of extended criteria donor (ECD) grafts due to significant ischemia-reperfusion injury leading to EAD. This injury is substantially reduced by thermoregulated oxygenated machine perfusion. The aim of the paper was to assess the use of hypothermic oxygenated machine perfusion (HOPE) in ECD liver grafts in a high-volume liver transplantation center using a specific protocol. Method: Grafts with >30% macrosteatosis and with multiple ECD (at least 2 criteria) were perfused using dual HOPE (hepatic artery and portal vein perfusion), while HOPE (portal vein perfusion only) was used for the remaining ECD grafts. The main criteria to establish graft improvement were the improvement of arterial and portal perfusion flows, with lactate under 3 mmol/L throughout the procedure. Results: Between February 2016 and February 2022, 26 ECD liver grafts were harvested from DBD (donation after brain death) donors and benefitted from HOPE. Dual HOPE was used in 8 grafts (30.7%). Criteria for graft improvement were met in all grafts except 5 (19.2%), where lactate was over 3 mmol/L, with a median of 3.6 (range 3.5-6.1). The median follow-up was 5 months (range 2-44). No EAD was encountered. Conclusion: By using a combined protocol of HOPE and dual HOPE, ECD liver grafts may be safely used by avoiding early graft dysfunction.