The indexes in different time during perioperation were recorded which included heart rate(HR),heart rate variation(HRV),the total power of heart rate variation(TP),low frequency(LF),high frequency(HF),et al.

• 观察围手术期不同时点心率(HR)和心率变异(HRV)、心率变异总功率(TP)、低频(LF)、高频(HF)、LF/HF、uHF(HF/TP)等各项指标的变化。