4[1]Lifschitz R. Spinal epidural anesthesia. A new combination system. Anaesthesia, 1992, 47: 503-505.
5[2]Greene NM:Physiology of Spinal Anesthesia, 3rd ed.Baltimore: Williams & Wilkins, 1981.
6[3]Cameron AE,Arnold RW, Ghoris MW, et al. Spinal analgesia using bupivacaine 0.5% plain: Variation in the extent of the block with patient age. Anaesthesia, 1981,36: 318-319.
7[4]Kety SS, King BD, Horvath SM, et al. The effect of an acut reduction in blood pressure by means of differential spinal sympathetic block on the cerebral circulation of hypertensive patients. J Clin Invest, 1950, 29: 403-405.
8[5]Hackel DB, Sancetta S, Kleinerman J. Effect pf hypotension due to spinal anesthesia on coronary blood flow and myocardical metabolism in man. Circulation,1956,13:92-94.
9[6]Hogan Q, Amuzu J, Bosnjak ZJ, et al. Hypoxia during epidural anesthesia results in apnea in rabbits. Reg Anesth, 1997,22: S2.
10Denotschman CS,Harris AP,FleisherLA.changes in heart rate variability under propofol anesthesia:a possible explanation for propofol induced brady caridia[J].Aresth Araly,1994,79:373～377.
