5Meister GC,Angelo RD,Owen M,et al.A comparison of epidural analgesia with 0. 125% ropivacaine with fentanil versus 0. 125%bupivacain with fentanyl during labor[].Anesthesia and Analgesia.2000
6Gaiser RR,Venkateswaren P,Cheek TG,et al.Comparison of 0.25 % ropivacaine and bupivacaine for epidural analgesia for labor and vaginal delivery[].Journal of Clinical Anesthesia.1997
7Fischer C,Blanie P,Jaouen E,et al.Ropivacaine, 0. 1%, plus sufentanil, 0. 5μg ml versus bupivacaine, 0. 1% , plus sufentanil 0. 5μg ml, using patient-controlled epidural analgersia for labor: a double-blind comparison[].Anesthesiology.2000
8Campbell DC,Zwack R M,Crone LL,et al.Ambulatory labor epidural analgesia: bupivacaine versus ropivacaine[].Anesthesia and Analgesia.2000
9Macarthur A,Macarthur C,Weeks S,et al.Epidural anaesthesia and low back pain after delivery: a prospective cohort study[].British Medical Journal.1995
10Benhamou D,Hamza J,Eledjam JJ,et al.Continuous extradural infusion of ropivacaine 2mg.ml ’ for pain relief during labor[].British Journal of Anaesthesia.1997
