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Plasma propofol concentrations during orthotopic liver transplantation
Author(s) -
Wu J.,
Zhu S. M.,
He H. L.,
Weng X. C.,
Huang S. Q.,
Chen Y. Z.
Publication year - 2005
Publication title -
acta anaesthesiologica scandinavica
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.738
H-Index - 107
eISSN - 1399-6576
pISSN - 0001-5172
DOI - 10.1111/j.1399-6576.2005.00671.x
Subject(s) - medicine , propofol , liver transplantation , orthotopic liver transplantation , transplantation , anesthesia , pharmacology , surgery
Objective: The aim of this study was to investigate the changes in plasma concentrations of propofol in three phases (the paleohepatic, anhepatic, and neohepatic phases) during orthotopic liver transplantation (OLT) using target‐controlled infusion (TCI). Methods: Ten patients undergoing OLT without venovenous bypass were studied (age 29–53 years, weight 56–79 kg). After intubation, a non‐hypnotic target concentration of propofol 0.5 µg ml −1 using a Diprifusor ® pump (Zeneca Pharmaceuticals, Macclesfield, UK) was administered as a supplement anesthesia throughout the procedure. Plasma samples were obtained in each phase for propofol assay, respectively. Performance parameters for the Diprifusor ® system in each phase, the percentage median performance error (MDPE), the percentage median absolute performance error (MDAPE), and the percentage median absolute constancy error (MDACE) were evaluated. Results: In all patients, measured plasma propofol concentrations were several times higher than Diprifusor ® values in each phase during the procedure. In nine patients, propofol concentrations in the anhepatic phase were higher than those in the paleohepatic or neohepatic phase ( P < 0.05). There were no significant differences between the paleohepatic and neohepatic phases. Interindividual variation of the plasma propofol concentrations was significant ( P < 0.05). Percentage median performance error of Diprifusor ® in each phase, as well as MDAPE, was large (>300%) and was significantly higher in the anhepatic phase ( P < 0.01), whereas MDACE was relatively small and there was no significant difference between phases. Conclusions: Models used by Diprifusor ® are not suitable for liver transplantation patients. A further study should be performed in order to determine all pharmacokinetic parameters of propofol in these patients.