Abstract
Electroencephalographic (EEG) monitoring was one of the first neurophysiologic techniques to be used in the operating room. EEG helps assess cerebral function during surgical procedures. It is different than evoked potential monitoring in the operating room as there is no stimulus used to elicit the waveforms, rather ongoing “spontaneous” activity is assessed. One of the earliest applications of EEG in the operating room was to determine adequacy of cerebral perfusion during carotid endarterectomy surgery. Subsequently, many other uses have been realized for EEG monitoring. In this presentation, the specifics of EEG recording techniques in the operating room will be discussed. Anesthetics can greatly affect the EEG, and these effects will be reviewed. How and why the EEG changes during surgery will be discussed as well. Finally, the clinical applications for EEG monitoring will be reviewed.
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