5Riley ET, Cohen SE, RtJbenstein AJ, et al. Prevention of hypotinsion after spinal anesthesia for cesarean section:six percent Hetastarch versus lac- tated Ringe' s solution[J]. Anesth Analg, 1995,81 (4) : 838-842.
6Rosenberg PH,Kytta J,Alila A. Absorption of bup ivacaine,etidocaine, lignocaine and top ivacaine into N2hep tane,rat sciatic nerve and huma- nextradural and subcutaneous fat[J].Br J Anaesth, 1986,58(3) : 510-314.
7Camorcia M, Capogna G, Lyons G, et al. The relative motor blocking po- tencies of intrathecal rop ivacaine:effects of concentration[J]. Anesth Analg, 2004,98(6) : 1779-1782.