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Detecting Connected Consciousness During Propofol-Induced Anesthesia Using EEG Based Brain Decoding.

Yubo Wang1, Chenghao Wan1, Yun Zhang1

  • 1School of Life Science and Technology, Xidian University, Xi'an, P. R. China.

International Journal of Neural Systems
|May 10, 2021
PubMed
Summary
This summary is machine-generated.

Brain decoding using EEG can detect "connected consciousness" during anesthesia. This suggests consciousness loss is gradual, not abrupt, even without behavioral responses.

Keywords:
EEGbrain decodingconnected consciousnesspropofol

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Area of Science:

  • Neuroscience
  • Anesthesiology
  • Cognitive Science

Background:

  • Emerging evidence suggests anesthesia patients may retain awareness despite lacking behavioral responses.
  • Connected consciousness describes the state where external stimuli can be perceived internally, even without outward reaction.

Purpose of the Study:

  • To investigate the efficacy of electroencephalography (EEG) based brain decoding in identifying connected consciousness during propofol-induced anesthesia.
  • To determine if EEG can detect awareness in patients unable to exhibit behavioral responses.

Main Methods:

  • Trained an EEG-based brain decoding model on auditory stimuli discrimination tasks in an awake state.
  • Tested the model on 14 subjects undergoing ultraslow propofol infusion, assessing performance during behavioral responsiveness and unresponsiveness.
  • Monitored changes in classification accuracy with varying propofol concentrations and after drug cessation.

Main Results:

  • The brain decoding model achieved high accuracy when subjects could respond to stimuli.
  • Accuracy significantly decreased when subjects lost the ability to respond behaviorally.
  • EEG decoding accuracy showed a gradual decline with increasing propofol dosage and rebounded upon drug cessation, preceding full consciousness recovery.

Conclusions:

  • Loss of consciousness during anesthesia is a gradual continuum, progressing through stages of full, connected, and disconnected consciousness.
  • EEG-based brain decoding offers a potential method for assessing awareness in unresponsive anesthetized patients.
  • This research challenges the notion of abrupt loss of consciousness under anesthesia.