Population Pharmacokinetics of Fentanyl in Patients Undergoing Living Donor Liver Transplantation
The aim of this study was to characterize pharmacokinetics of fentanyl during and after Living Donor Liver Transplantation (LDLT), using population pharmacokinetic analysis with non linear mixed effects modeling.
|Study Design:||Allocation: Non-Randomized
Endpoint Classification: Pharmacokinetics Study
Intervention Model: Single Group Assignment
Masking: Open Label
Primary Purpose: Treatment
|Official Title:||Population Pharmacokinetics of Fentanyl in Patients Undergoing Living Donor Liver Transplantation|
- pharmacokinetic parameters of fentanyl during LDLT [ Time Frame: 48 Hours (during anesthesia of LT and after infusion stop) ] [ Designated as safety issue: No ]characterize pharmacokinetics of fentanyl during and after LDLT, using population pharmacokinetic analysis with non-linear mixed effects modeling.
|Study Start Date:||September 2009|
|Study Completion Date:||October 2010|
|Primary Completion Date:||September 2010 (Final data collection date for primary outcome measure)|
|Experimental: pharmacokinetics of fentanyl||
an initial intravenous bolus of fentanyl 100 μg and infusion of fentanyl at variable rates ranging from 250 to 400 μg/hr
Patients received an initial intravenous bolus of fentanyl 100 μg and infused at variable rates ranging from 250 to 400 μg/hr.
Arterial blood samples (3ml) were taken immediately before the start of infusion (baseline), and at scheduled time which were coincident with laboratory tests during surgery as follows. In pre-anhepatic phase, blood were taken at 10min, 30min, 1hr, 3hr, 5hr until clamping of the hepatic blood supply and venous drainage, after the star of anhepatic phase, blood were taken at 5 min, 10 min, 30 min, 60 min, 90 min, 2hr until the vessels were reconnected to new liver. In neo-hepatic phase, blood were taken at 5min, 10min, 30min, 60min, 90min, 2hr, 3hr, 5hr until fentanyl-infusion stop, and at 0hr, 1hr, 3hr, 5hr, 8hr, 12hr, 24hr immediately after the stop of infusion. Samples were collected into tubes containing heparin as an anticoagulant and immediately placed on ice. After centrifugation for 8 min at 1800 g, the plasma was transferred to a cryovial and stored at -70°C until assay.