1Scott DA, Blake D, Buckland M, et al. A comparison of epidural ropivacaine infusion alone and in combination with 1, 2, and 4μ g/ml fentanyl for 72 hours of postoperative analgesia after major abdominal surgery[J]. Anesth Analg, 1999, 88: 857-864.
2Whiteside R, Jones D, Bignell S, et al. Epidural ropivacaine with fentanyl following major gynaecological surgery: the effect of volume and concentration of pain relief and motor impairment[J]. Br J Anaesth, 2000, 84: 720-724.
3Feldman HS. Toxicity of local anaesthetics agents. In: Rice SA,Fish, KJ, eds. Local anesthesic toxicity[M]. New York: Raven Press, 1994: 107.