To evaluate the depth of enflurane anesthesia, spectrum analysis of rat EEG was used.
Bipolar EEG was recorded through one lead form rat scalp during inhalation with 1, 2, 3 and 4% of enflurane, and analysed to prduce the spectrum from which the density of each band (delta 1-3.25 Hz, theta 3.5-7.75 Hz, alpha 8-12.75 Hz, beta 1
13-17.75
Hz, beta 2 18-20.75 Hz, and beta 3 21-31.75Hz) and total density, and median power frequency were calculated.
Differences among the EEG patterns, which were represented by F values through discriminant analysis of those 8 variables, in each level of anesthesia were significant among all concentrations except between 1% and 2% enflurane administration.
The results suggest that the discriminant analysis for the Eeg parameters derived from power spectrum analysis can apply to determine the level of enflurane anesthesia.
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