British Journal of Anaesthesia, Vol 81, Issue 6 957-959, Copyright © 1998 by The Board of Management and Trustees of the British Journal of Anaesthesia
O. Engdahl, M. Abrahams, A. Bjornsson, M. Vegfors, B. Norlander, J. Ahlner and C. Eintrei
The concentration of propofol in and surrounding the human brain during
propofol anaesthesia is unknown. We measured simultaneously the
concentration of propofol in cerebrospinal fluid (CSF) from an indwelling
intraventricular catheter and the concentration in arterial blood in five
neurosurgical patients before, during induction (at 2.5 and 5 min) and
during a maintenance propofol infusion (at 15 and 30 min). After induction
of anaesthesia with propofol 2 mg kg-1, anaesthesia was maintained with an
infusion of 8 mg kg-1 h-1 for 15 min and then reduced to 6 mg kg-1 h-1. The
plasma concentration of propofol increased rapidly during induction and
reached a plateau concentration of mean 2.24 (SD 0.66) micrograms ml-1
after 5 min. The concentration of propofol in CSF showed a slower increase
during induction and remained almost constant at 35.5 (19.6) ng ml-1 at
15-30 min after induction. The CSF concentration of propofol that we
measured was 1.6% of the plasma concentration and consistent with the high
protein binding of the drug in plasma.
SHORT COMMUNICATIONS
Cerebrospinal fluid concentrations of propofol during anaesthesia in humans
Department of Anaesthesia and Intensive Care, University Hospital, S-58 185 Linkoping, Sweden; Department of Clinical Pharmacology, University Hospital, S-58 185 Linkoping, Sweden
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