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Updated: Jun 18, 2026

A Method for Tracking the Time Evolution of Steady-State Evoked Potentials
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Published on: May 25, 2019

A wavelet based method for steady-state detection in anesthesia.

Ana Castro1, Fernando G Almeida, Pedro Amorim

  • 1Faculdade de Engenharia da Uni-versidade do Porto, Rua Dr. Roberto Frias sn 4200-465, Porto, Portugal. ana.castro@fe.up.pt

Annual International Conference of the IEEE Engineering in Medicine and Biology Society. IEEE Engineering in Medicine and Biology Society. Annual International Conference
|December 8, 2009
PubMed
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This study analyzed the effect of hypnotic and analgesic drugs on the Bispectral Index (BIS), an EEG-based monitor, to understand steady-state conditions for future drug effect modeling. Wavelet analysis identified a steady-state index for anesthesia drug titration.

Area of Science:

  • Anesthesiology
  • Biomedical Engineering
  • Signal Processing

Background:

  • Patient outcomes in general anesthesia are a growing concern.
  • The Bispectral Index (BIS), an EEG-based monitor, is used to guide anesthetic drug titration and prevent awareness.
  • Understanding system behavior under steady-state conditions is crucial for process modeling.

Purpose of the Study:

  • To analyze the effect of hypnotic and analgesic drugs on the BIS.
  • To obtain steady-state information regarding the BIS response to drug administration.
  • To lay the groundwork for modeling the combined effects of anesthetic drugs.

Main Methods:

  • Analysis of the hypnotic and analgesic drugs' effect on the BIS.
  • Application of wavelet analysis for trend detection to identify steady-state conditions.

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  • Characterization of system input-output relationships.

    • Main Results:

    • A steady-state index was successfully obtained using wavelet analysis.
    • The study provides insights into the BIS response to drug administration under steady-state.
    • Identified a method to analyze drug effects on hypnosis indices.

    Conclusions:

    • Wavelet analysis is effective in determining a steady-state index for BIS monitoring.
    • The findings facilitate future modeling of combined drug effects in anesthesia.
    • This approach can offer insights into non-drug-related disturbances during anesthesia.