4Reiz S, Haggmark S,Johansson G,et al. Cardiotoxicity of ropivacaine:new amide local anaesthetic agent. Acta Anaesthesiol Scand, 1989,39: 93-98.
5Zaric D, Nydahl DA, Philipson L, et al. The effect of continuous lumbar epidural infusion of ropivacaine (0. 1%,0. 2% and 0. 3%)and 0. 25% bupivacaine on sensory and motor block in volunteers. Reg Anesth, 1996,21:14-25.
6Porter J, Bonello E, Reynolds F, et al. Effect of epidural fentanyl on neonatal respiration. Anesthesiology, 1998,89:79-85.
7Cascio MG, Gaiser RR, Camann WR, et al. Comparative evaluation of four different infusion rates of ropivacaine for epidural labor analgesia. Reg Anesth Pain Med, 1998,23:548-553.
8Benhamou D, Hamza J, Eledjam J J, et al. Continuous extradural infusion of ropivacaine 2 mg/ml for pain relief during labour. Br J Anaesth, 1997,78 : 748-750.
9Peach MJ. Patient-cotrolled epidural analgesia in labourisa continuous infusion of benefit? Anaesth Intens Care1992,20:15-20.