The Effect of General and Epidural Anesthesia in Women undergoing Cesarean Section on Power Spectral Components of Heart Rate Variability: Clinical Study / 대한마취과학회지

ABSTRACT

BACKGROUND: The analysis of beat-to-beat heart rate variability has become a method of assessing the state and health of the autonomic nervous system. Power spectral analysis(PSA) has become one of the most widely used techniques to describe heart rate variability. METHODS: We analyzed the heart rate variability using PSA before and during general and epidural anesthesia in cesarean section. We anesthetized 12 patients by enflurane, and 15 patients by 2% lidocaine via epidural catheter. Automatic computer analysis provided PSA. The PSA contained two major components, a low frequency(LF) at 0.04~0.15 Hz, and a high frequency(HF) at 0.15-0.50 Hz. RESULTS: Before anesthesia, P(LF)(spectral power of LF-unit; sec2/Hz) is 0.06(0.03, 0.34) {median(5 percentile, 95 percentile)}, P(HF), 0.83(0.22, 1.68), total spectral power(Ps), 1.98(O.86, 3.88), and P(LF)/P(HF), 0.67(0.17,1.67) in general anesthesia group. During anesthesia, P(LF) is 0.06(0.03, 0.34), P(HF), 0.12(0.04, 0.76), Ps, 0.43(0.24, 1.71), P(LF)/P(HF), 0.70(0.24, 2.59). In epidural group, before anesthesia, P(LF) is 0.30(0.11, 1.94), P(HF), 0.78(0.14, 1.94), Ps, 1.81(0.58, 5.23), P(LF)/P(HF) 0.47(0.25, 1.34). During anesthesia, P(LF). is 0.14(0.05, 0.41), P(HF), 0.33(0.07, 0.80), Ps, 0.81(0.34, 1.58), P(LF)/P(HF), 0.58(0.22, 1.08). CONCLUSIONS: In general anesthesia, P(LF) P(HF) and Ps during anesthesia showed significant decrease than pre-anesthetic period, but P(LF)/P(HF) did not change. In epidural anesthesia, P(LF)/P(HF) and Ps during anesthesia also decreased, but P(LF)/P(HF) did not change. There were significant differences in degree of decrease in Ps and P(HF) between general and epidural anesthesia, but no differences in and P(LF)/P(HF).