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Related Experiment Videos

Awareness detection during caesarean section under general anaesthesia using EEG spectrum analysis

L Gaitini1, S Vaida, G Collins

  • 1Department of Anesthesiology, Bnai-Zion Medical Centre, Haifa, Israel.

Canadian Journal of Anaesthesia = Journal Canadien D'Anesthesie
|May 1, 1995
PubMed
Summary

This study found that lower spectral edge frequency 90 (SEF90) values during anesthesia correlated with reduced awareness, indicated by responsiveness to verbal commands. Ketamine anesthesia resulted in lower SEF90 and less awareness compared to thiopentone.

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Area of Science:

  • Anesthesiology
  • Neuroscience
  • Medical Technology

Background:

  • Intraoperative awareness during general anesthesia is a significant concern.
  • Monitoring brain activity is crucial for assessing anesthetic depth.
  • Spectral edge frequency 90 (SEF90) is a quantitative EEG measure reflecting anesthetic effect.

Purpose of the Study:

  • To investigate the relationship between EEG SEF90 and the occurrence of awareness (responsiveness to verbal commands).
  • To compare awareness levels and SEF90 between ketamine and thiopentone for anesthesia induction.

Main Methods:

  • Fifty women undergoing elective Cesarean section received either ketamine or thiopentone for anesthesia induction.
  • The isolated forearm technique was used to detect responsiveness to verbal commands.

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  • EEG SEF90 was recorded continuously from pre-induction through delivery.

    • Main Results:

    • Awareness occurred in 24% of patients receiving ketamine (average SEF90: 12.0 ± 3 Hz) versus 52% receiving thiopentone (average SEF90: 18.09 ± 3 Hz).
    • A statistically significant difference (P = 0.01) was observed in awareness incidence between the groups.
    • SEF90 values ≤ 8.6 Hz were suggested as sufficient to prevent responsiveness.

    Conclusions:

    • EEG SEF90 is a reliable indicator of anesthetic depth and awareness.
    • Ketamine may provide better intraoperative awareness protection compared to thiopentone at the tested doses.
    • Targeting specific SEF90 levels could help minimize intraoperative awareness.