Tissue/blood and tissue/water partition coefficients for propofol in sheep.
The primary objective of this study was to determine in vivo tissue/blood partition coefficients of propofol for use in physiological modelling of its pharmacokinetics. The sheep was used as an animal model. In the main series of experiments, crossbred ewes received a bolus of propofol 1% (Diprivan) followed by an infusion during which blood concentrations were measured at intervals. After 2 h, the sheep were killed with an injection of potassium chloride, and tissue samples were taken for storage at -20 degrees C and subsequent analysis. Tissue/blood partition coefficients depend on the amount of triglyceride which accumulates in blood from the propofol vehicle; for blood, free of added triglyceride, the following coefficients were calculated: brain, 3.23; heart, 5.94; kidney, 2.46; spleen, 1.86; semimembranosus muscle, > or = 1.61; triceps muscle, > or = 1.47. Calculated tissue/water coefficients were 35 times greater. There was indirect evidence of extraction of propofol by the lungs.
Weaver
B M
BM
The Veterinary School, University of Bristol, Langford, UK.
Staddon
G E
GE
Mapleson
W W
WW
D018686:Anesthetics, Intravenous / Q000097:blood / Q000493:pharmacokinetics*; D000818:Animals; D015925:Cryopreservation; D005260:Female; D008099:Liver / Q000378:metabolism; D008954:Models, Biological; D015742:Propofol / Q000097:blood / Q000493:pharmacokinetics*; D012756:Sheep; D012995:Solubility; D014018:Tissue Distribution
D018686:Anesthetics, Intravenous; D015742:Propofol