Fig. 2. Infusion rates of propofol in representative volunteers. An intravenous bolus of each formulation was given at time 0. (  A ) Lipid emulsion formulation, (  B ) microemulsion formulation of propofol. Infusion rate was changed 7 ± 4 (mean ± SD) times for lipid emulsion and 7 ± 3 times for microemulsion during study period in all subjects.