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Intracranial electroencephalographic changes in deep anesthesia.

H Karasawa1, K Sakaida, S Noguchi

  • 1Department of Neurosurgery, Funabashi Municipal Medical Center, 1-21-1, Kanasugi, Funabashi-shi, 273-8588, Chiba, Japan. karasawa@ya2.so-net.ne.jp

Clinical Neurophysiology : Official Journal of the International Federation of Clinical Neurophysiology
|January 4, 2001
PubMed
Summary
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Intracranial electroencephalograms (EEGs) reveal brain activity during deep anesthesia, unlike scalp EEGs. This new monitoring system detects subtle signs of brain revival when standard EEGs show silence.

Area of Science:

  • Neuroscience
  • Anesthesiology
  • Medical Devices

Background:

  • Scalp electroencephalograms (EEGs) are known to show electrical silence during deep anesthesia and brain death.
  • Previous studies have not reported on intracranial EEG changes specifically within the context of deep anesthesia.

Purpose of the Study:

  • To report the first findings on intracranial EEG activity during deep anesthesia.
  • To investigate the utility of a novel direct brain monitoring system for intracranial EEG recordings.

Main Methods:

  • Development of a new direct brain monitoring system for intracranial EEGs.
  • Inclusion of 13 patients with head trauma or cerebrovascular accident undergoing deep anesthesia.
  • Recording intracranial EEGs and comparing them with scalp EEGs.

Related Experiment Videos

Main Results:

  • Intracranial EEGs demonstrated distinct wave activity patterns at brain depth compared to the cortical surface.
  • Scalp EEGs showed flat tracings in some cases at 2.0-2.5% isoflurane, with concurrent electrical silence in intracranial EEGs.
  • Decreasing isoflurane revealed 'revival' theta waves and burst-wave activity in intracranial EEGs, indicating brain activity not visible on scalp recordings.

Conclusions:

  • Intracranial EEGs reveal brain wave activity differences in the brain's depth that are undetectable by scalp EEGs.
  • Intracranial EEGs can identify early indicators of brain revival following periods of near-flat tracing during deep anesthesia.