Developing Viability Index for Machine Perfused Livers

For measurement of tissue co-factor levels, we will take needle biopsies of transplanted livers immediately after procurement, immediately prior to implantation (at the end of preservation), 30 minutes after portal vein reperfusion, and 30 minutes after hepatic artery reperfusion. For those livers that have more than 60 minutes between portal vein and hepatic artery reperfusion, an additional biopsy will be performed at 60 minutes after portal vein reperfusion. Post-procurement biopsies will be collected regardless of where the liver was obtained.