Abstract
Background: In this study, a distribute characteristics on the bispectral coupling of EEG were examined according to the depth of anesthesia by using bispectum analysis a type of nonlinear signal processing. Methods: 25 patients during the general anesthesia were studied. In the preprocess, base line correction and linear detrend was used. During the awakening state, preoperatively and postoperatively, appearance rate of bispectral coupling was observed that a strong appearance rate was represented in major frequency zone such as (15, 15) Hz but weak appearance rate investigated in the other minor frequency zone. Whilst anesthetized, a strong appearance rate revealed the low frequency range below (10, 10) Hz and a weak appearance rate viewed in the other frequency range. As such was compared with the delta ratio and spectrum edge frequency (SEF). Results: The delta ratio showed significantly lower values at induction (3.60 0.98) and during the maintenance (5.0P1.74) of anaesthesia than preoperatively (10.30 2.44) and postoperatively (13.03 2.29)(P 1.22) and postoperatively (12.20 L 1.53) than preoperatively (22.50 1.75) and at the induction (22.40 1.18) of anesthesia(P
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