Sequential use of normothermic regional and ex‐situ machine perfusion in DCD liver transplant

In Italy, 20 minutes of continuous, flat-line electrocardiogram are required for declaration of death. In the setting of organ donation after cardiocirculatory death (DCD), prolonged warm ischemia time prompted introduction of abdominal normothermic regional perfusion (NRP) followed by post-procurement, ex-situ machine perfusion. This was a retrospective review of DCD liver transplantations performed at two centers using sequential NRP and ex-situ machine perfusion. From January 2018 to April 2019, 34 DCD donors were evaluated. Three (8.8%) were discarded before NRP, 11 (32.4%) based on NRP parameters (n=1, 3.0%), liver macroscopic appearance at procurement and/or biopsy results (n=9, 26.5%), or severe macroangiopathy at back table evaluation (N=1, 3.0%). Twenty grafts (58.8%) (12 uncontrolled DCD, 8 controlled DCD) were considered eligible for LT, procured and perfused ex-situ (9 normothermic and 11 dual hypothermic machine perfusion). Eighteen (52.9%; 11 uncontrolled) were eventually transplanted. Median (IQR) no-flow time was 32.5 (30-39) minutes, while median functional-warm ischemia time was 52.5 (47-74) minutes (controlled DCD) and median low-flow time 112 (105-129) minutes (uncontrolled DCD). There was no primary non-function, while post-reperfusion syndrome occurred in 8 (44%) recipients. Early allograft dysfunction happened in 5 (28%) patients, while acute kidney injury in 5 (28%). After a median follow up of 15.1 (9.5-22.3) months, one case of ischemic-type biliary lesion and one patient death were reported. DCD liver transplantation is feasible even with the 20-minute no-touch rule. Strict normothermic regional perfusion and ex-situ machine perfusion selection criteria are needed to optimize post-operative results.