6Ledowski T,Bein B,Hanss R,et al.Neuroendocrine stress response and heart rate variability:a comparison of total intravenous versus balanced anesthesia[J].Anesth Analg,2005,101(6):1700-1705.
7Kanaya N,Hirata N,Kurosawa S,et al.Differential effects of propofol and sevoflurane on heart rate variability[J].Anesthesiology,2003,98(1):34-40.
8Deutschman CS,Harris AP,Fleisher LA.Changes in heart rate variability under propofol anesthesia:A possible explanation for propofol-induced bradycardia[J].Anesth Analg,1994,79(2):373-377.
9Huang HH,Chan HL,Lin PL,et al.Time-frenquency spectral analysis of heart rate variability during induction of general anaesthesia[J].Br J Anaesth,1997,79(6):754-758.
10Pomfrett CJ.Heart rate variability,BIS and'depth of anaesthesia'[J].Br J Anaesth,1999,82(5):659-662.