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Physiologic electroencephalography (EEG) monitors designed for continuous intraoperative measurement of the brain activity and the translation and display of its value as a numerical index (i.e., the level of consciousness). They may also process and display EEG waveforms and/or density spectral arrays. These monitors include a central computerized module with electronic circuits that can process the signal, a display, and a patient cable with disposable EEG electrodes. Level of consciousness monitors are mostly intended to help in the evaluation of the brain state changes (e.g., depth of anesthesia) in response to drug dose during surgery; their use may reduce the quantity of anesthetic agents required and accelerate the release of patients from the post anesthesia care units.
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