2Michael JC,Phillip OB.Neural blockade in clinical anesthesia and management of pain.2nd ed.JB Lippincottco,1987,539
3Douglas MJ,weeks SB,Gambling DR,et al.Adouble-blind comparison between epidural ropivacaine 0.25% and bupivacaine 0.25% for the relief of pain during childbirth:report of amulticentre study.Reg Anesth,1994,19(supple2s):52
4James CF.Pain management for labor and delivery in the 90s.J Fla Med Assoc,1997,84(1):28
5Stienstra R,Jonker T,Bourdrez P,et al.Ropivacaine 0.25% versus bupivacaine 0.25% for continuous epidural analgesia in labor:a double-blind comparison.Obstet Aneath,1995,80(4):285
6Chestnut DH,Gibbs CP.Obstetric anesthesia.In:Gabbe SG,Niebyl JR,Simpson JL,Obstetrics Normal & Problem Pregnancies.2 nd ed.New York:churchill Livingstone,1991,496
7Alexander JM.The course of labor with and without epidural analgesia.Am J,Obstet Gynecol,1998,178(3):516
8Chetnet DH.Does epidural analgesia during labor affect the insidence of cesarean delivery.Reg Anesth,1997,22(6):495
