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Related Experiment Video

Updated: Apr 14, 2026

Use of a Wireless Video-EEG System to Monitor Epileptiform Discharges Following Lateral Fluid-Percussion Induced Traumatic Brain Injury
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Phase-Specific Electroencephalography Monitoring: A Dynamic Approach to Predict Postoperative Delirium During Aortic

Young Song1, Hye S Lee2, Dong W Han1

  • 1Department of Anaesthesiology and Pain Medicine, Anaesthesia and Pain Research Institute.

Journal of Neurosurgical Anesthesiology
|April 13, 2026
PubMed
Summary

Dynamic electroencephalography (EEG) monitoring during aortic arch surgery effectively predicts postoperative delirium (POD). Key EEG predictors like alpha and delta power vary across surgical phases, aiding risk stratification.

Keywords:
aortic surgerycardiopulmonary bypassdeliriumelectroencephalography

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Area of Science:

  • Neuroscience
  • Cardiovascular Surgery
  • Anesthesiology

Background:

  • Static or averaged electroencephalography (EEG) metrics may not reflect dynamic cerebral changes during complex surgeries.
  • Aortic arch surgery with cardiopulmonary bypass (CPB) and total circulatory arrest (TCA) poses risks for neurological complications like postoperative delirium (POD).

Purpose of the Study:

  • To assess intraoperative EEG features during aortic arch surgery.
  • To identify key EEG predictors of POD in patients undergoing CPB and TCA.
  • To develop phase-specific EEG models for predicting POD.

Main Methods:

  • Retrospective analysis of intraoperative EEG data from 233 patients.
  • EEG data analyzed across five distinct surgical phases: pre-CPB, CPB initiation, TCA, post-TCA, and post-CPB.
  • Logistic regression and phase-specific nomogram models used to assess predictive potential.

Main Results:

  • Postoperative delirium (POD) occurred in 44.8% of patients.
  • Reduced alpha power post-CPB and lower delta power during TCA were independent predictors of POD.
  • Elevated BSR during CPB initiation and post-TCA predicted increased POD incidence.
  • Phase-specific models demonstrated high predictive performance with strong calibration.

Conclusions:

  • Phase-specific EEG monitoring reliably predicts POD during aortic arch surgery.
  • Predictive EEG factors are dynamic and vary across intraoperative phases.
  • Comprehensive, phase-specific EEG assessment can enhance perioperative risk stratification and management.