Changes of Power Spectrum of R-R Interval Variability during Recovery from Anesthesia - Preliminary report / 대한마취과학회지

ABSTRACT

Changes of power spectrum of R-R interval variabilty during recovery from N2O-O2 - halothane anesthesia have been studied in 20 patients. Power spectral analysis of R-R intervals during awake period and recovery period have been performed with newly developed R-R interval variability, we compared the power of each frequency range(low 0.04-0.08 Hz, middle 0.10-0.15 Hz, high above 0.3 Hz) between awake period and recovery period. There was no difference between awake period and recovery period in the power of low and high frequency ranges, but there was remarkable difference in power of midfrequency range. During awake period the power of midfrequency range changed with cyclic pattern, but there was no cyclic change during recovery period even after the regain of consciounss(30+/-3.2 min.). The power of midfrequency range during recovery period began to change with cyclic pattern only after 45 minutes. It is concluded that the power of midfrequency range is useful index of recovery from N2O-O2 -halothane anesthesia.