The Use of Anesthesia and Brain Activity Monitor

Abstract

ABM has been recently accepted as an anesthesia depth monitor, which is estimated by EMG, EEG, NMT, expiratory CO₂ and blood pressure. We used ABM during high dose fentanyl, GOE and GO plus epidural anesthesia. There were only small changes in EMG activity during the operation, but EEG was changed in its frequency and amplitude according to the kind of anesthetic agents, and depth of anesthesia. NMT was not reliable to decide the time of the additional administration of muscle relaxants. The depth of anesthesia has been inspected by anesthetic agents, blood pressure, heart rate, the size of pupil, mevements to surgical stimulations, et al.
ABM seems to give us useful information about the anesthetic depth.