Evidence for Nonlinear Behavior of Propofol Pharmacodynamics Using Temporal Analysis of Bispectral Index and Modulation of the Frontal Alpha Oscillation
Authors' conclusion
These findings suggest that current models are inadequate in explaining the dose-effect relationship of propofol's anesthetic properties.
Study context
- Population
- Healthy young patients scheduled for surgery under GA
- Participants
- 23 patients
- Comparison
- Observed vs Eleveld PKPD model-predicted BIS, before vs after a propofol-induced burst suppression perturbation
- Outcome
- Actual BIS vs BIS predicted by the Eleveld PKPD model
Methodological detailsnonrandomized
- Nonrandomized
Main finding
As reported in the abstract
Observed vs predicted BIS
- Before perturbation: observed vs predicted BIS, mean ± SD 64.5 ± 10.7 vs 61.3 ± 8.7, paired t test P = .3 (no significant difference)
- After perturbation: observed vs predicted BIS, mean ± SD 38.2 ± 7.5 vs 55.5 ± 7.5, paired t test P < .001 (actual consistently lower)
Further findings
Mean
| Outcome | Before perturbation | After perturbation | P value |
|---|---|---|---|
| Delta-alpha phase-amplitude modulation strengthSignificantly higher after perturbation | 0.16 (SD 0.04) | 0.21 (SD 0.06) | P = 0.01 |
Alpha power
- Alpha power remained lower after perturbation despite effect-site concentration returned to pre-perturbation level
Original publication
Evidence for Nonlinear Behavior of Propofol Pharmacodynamics Using Temporal Analysis of Bispectral Index and Modulation of the Frontal Alpha Oscillation. Anesth Analg. Published 16 February 2026. doi:10.
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