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Related Experiment Videos

The auditory steady state response during sufentanil anaesthesia.

G Plourde1, J F Boylan

  • 1Department of Anaesthesia, Royal Victoria Hospital, Montreal, Quebec, Canada.

British Journal of Anaesthesia
|June 1, 1991
PubMed
Summary

Auditory steady state response (ASSR) monitoring showed significant attenuation during high-dose sufentanil anesthesia, correlating with consciousness levels. ASSR reappeared with early awakening signs, suggesting its potential for anesthesia monitoring.

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Area of Science:

  • Neuroscience
  • Anesthesiology
  • Auditory Evoked Potentials

Background:

  • The auditory steady state response (ASSR) is an evoked potential used in audiology.
  • Monitoring consciousness during anesthesia is crucial for patient safety.

Purpose of the Study:

  • To evaluate the utility of ASSR as a measure of consciousness level during high-dose sufentanil anesthesia for cardiac surgery.

Main Methods:

  • ASSR and electroencephalogram (EEG) were recorded in eight patients undergoing cardiac surgery with high-dose sufentanil anesthesia.
  • ASSR and EEG changes were observed before, during, and after anesthesia induction.

Main Results:

  • ASSR was present before anesthesia induction in all patients.

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  • ASSR was severely attenuated or abolished upon loss of consciousness.
  • ASSR reappeared at low amplitude post-anesthesia and increased with early signs of awakening.

    • Conclusions:

    • ASSR shows promise as a tool for monitoring consciousness levels during potent opioid anesthesia.
    • Changes in ASSR amplitude correlated with EEG changes and clinical signs of consciousness.
    • Further research is warranted to validate ASSR for intraoperative consciousness monitoring.