Healthy Clinical Trial
Official title:
The Influence of Injection Rate on EEG Propofol Peak Effect as Measured by Bispectral Index
The aim of the present study was to investigate whether injection rate of propofol has an influence on its maximum effect.
The clinical daily routine indicates that slowing the rate of administration of propofol can
lead to a reduction of up to 50% in the dose of propofol required to achieve the onset of a
clinical endpoint of anesthesia (i.e. loss of consciousness) when titrating to effect.
Therefore, it has been concluded that a slow injection requires a smaller dose of propofol
as the graded effect is weakened by fast injection. This conclusion contradicts
pharmacologic considerations, that a fast injection would lead to a higher peak
concentration and in consequence, to a higher peak effect at the effect side, the brain.
The present study was designed to measure the Electroencephalogram (EEG) peak effect of a
propofol bolus (2 mg/kg) injected with different infusion rates.
Although it is known that propofol has cardiovascular effects, the influence of injection
rate on these cardiovascular changes is less clear. Others found that faster injection rates
of propofol caused greater reductions in blood pressure. Other similar studies have shown no
difference in blood pressure for different injection rates. An additional aim of this study
was therefore to investigate the influence of different injection rates on hemodynamic
parameters.
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Allocation: Randomized, Endpoint Classification: Pharmacokinetics/Dynamics Study, Intervention Model: Single Group Assignment, Masking: Single Blind, Primary Purpose: Treatment
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