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  • Title: Spectral analysis of EEG during carotid endarterectomy.
    Author: Ivanovic LV, Rosenberg RS, Towle VL, Graham AM, Gewertz BL, Zarins C, Spire JP.
    Journal: Ann Vasc Surg; 1986 May; 1(1):112-7. PubMed ID: 3504678.
    Abstract:
    Spectral analysis of the electroencephalogram (EEG) was monitored during 105 carotid endarterectomies. Seventy-eight percent of the patients showed no significant change in EEG spectral power as a result of clamping of the internal carotid artery. Two patterns of change were observed in the remaining 22% of patients: partial reduction (significant decrease of power in one or two of three frequency bands) and global reduction (significant decrease of power in all three frequency bands). High frequencies (over 10.5 Hz) changed more frequently with clamping than did low frequencies (less than 6 Hz), but reduction of high frequencies alone was tolerated with no postoperative deficits. The only non-shunted patient demonstrating global EEG reduction for the duration of carotid clamping suffered a transient hemiparesis.
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