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Related Experiment Videos

Stroke-related EEG changes during carotid surgery.

J M Krul1, R G Ackerstaff, B C Eikelboom

  • 1Department of Clinical Neurophysiology, St. Antonius Hospital, Nieuwegein, The Netherlands.

European Journal of Vascular Surgery
|October 1, 1989
PubMed
Summary

Persistent EEG asymmetry during carotid endarterectomy indicates major intraoperative stroke, though minor strokes remain undetected. This finding aids in understanding EEG changes and stroke risk during the procedure.

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Area of Science:

  • Neurology
  • Neurosurgery
  • Medical Monitoring

Background:

  • Carotid endarterectomy is a common procedure to prevent stroke.
  • Intraoperative stroke remains a significant risk during carotid endarterectomy.
  • Electroencephalography (EEG) is used to monitor brain activity during surgery.

Purpose of the Study:

  • To determine the relationship between EEG changes and intraoperative stroke during carotid endarterectomy.
  • To evaluate the diagnostic accuracy of EEG monitoring for detecting stroke.
  • To understand the origin of major strokes identified by EEG.

Main Methods:

  • Review of EEG recordings from 230 carotid endarterectomies using an automated EEG monitoring system.
  • Selective shunting of patients based on EEG changes after carotid cross-clamping.

Related Experiment Videos

  • Analysis of EEG asymmetry patterns and their correlation with intraoperative stroke events.

    • Main Results:

    • Transient EEG asymmetry did not correlate with intraoperative stroke.
    • Persisting EEG asymmetry was associated with major intraoperative stroke (PPV 0.50, Specificity 0.99, Sensitivity 0.80).
    • Minor strokes were not detectable by EEG monitoring; analysis suggested a thrombo-embolic origin for most major strokes.

    Conclusions:

    • Persisting EEG asymmetry is a specific indicator of major intraoperative stroke during carotid endarterectomy.
    • EEG monitoring can help identify patients at high risk for major stroke, guiding surgical decisions.
    • Current EEG monitoring systems have limitations in detecting minor strokes and require further refinement.