Intraoperative Assessment of Microcirculatory Function Using Vascular Occlusion Test During Liver Transplantation

Early allograft dysfunction (EAD) remains one of the most important complications following orthotopic liver transplantation (OLT). Currently, there is no established intraoperative biomarker that reliably predicts graft dysfunction at an early stage. Near-infrared spectroscopy (NIRS) combined with the vascular occlusion test (VOT) is a non-invasive method for assessing tissue oxygenation and microcirculatory reserve. This prospective observational study aims to investigate whether VOT-derived parameters, including desaturation slope, recovery slope and post-ischemic hyperemic area under the curve (AUC-H), can predict EAD in liver transplant recipients. Measurements will be performed at four predefined intraoperative timepoints: after induction of anesthesia, during the anhepatic phase, during the neohepatic phase and at the end of surgery. The primary outcome is the occurrence of EAD according to Olthoff criteria.

NCT Number	NCT07658794
Lead Sponsor	Ippokrateio General Hospital of Thessaloniki
Conditions	Liver Cirrhosis, Early Allograft Dysfunction
Enrollment	50 participants
Start Date	2026-06
Primary Completion	2027-03 (estimated)
Study Completion	2027-06 (estimated)
Updated on ClinicalTrials.gov	2026-07-01