title: Intraoperative EEG monitoring: (I). Parametric representation of processed EEG during anesthesia.
abstract: One of the most common techniques of EEG monitoring during operations is to produce a three dimensional image by displaying the frequency distributions with respect to time as in compressed spectral array (CSA) and density-modulated spectral array (DSA). In order to characterize these images by numerical parameters, we defined two parameters; the percent spectral edge frequency as the frequency at which the one-sided-power sum reaches the designated percentage of the total; and the mean frequency as the power-weighted mean within the interval that includes a dominant spectrum in the frequency distribution. These parameters were superimposed on displays to characterize EEG changes, and they proved to be a very powerful tool to quantitate variations in data among anesthetic techniques and thus efficiently control the depth and duration of anesthesia. We report a number of actual cases.
authors.affiliation: Department of Anesthesiology, School of Medicine, Tokai University, Kanagawa, Japan.
authors.forename: Y
authors.initials: Y
authors.lastname: Kinefuchi
authors.forename: H
authors.initials: H
authors.lastname: Katoh
authors.forename: I
authors.initials: I
authors.lastname: Ohtani
authors.forename: T
authors.initials: T
authors.lastname: Iga
authors.forename: K
authors.initials: K
authors.lastname: Shirakura
authors.forename: Y
authors.initials: Y
authors.lastname: Yamasaki
mesh_terms: D000328:Adult; D000758:Anesthesia; D002047:Buprenorphine; D004569:Electroencephalography / Q000295:instrumentation; D004737:Enflurane; D005283:Fentanyl; D006801:Humans; D007091:Image Processing, Computer-Assisted; D007432:Intraoperative Period; D007649:Ketamine; D008875:Middle Aged; D009020:Morphine; D013514:Surgical Procedures, Operative
chemical_list: D002047:Buprenorphine; D007649:Ketamine; D009020:Morphine; D004737:Enflurane; D005283:Fentanyl