2Samuel C II. Subrachnoid and epidural analgesics in obstetrics. ASA Anual Refresher Course Lectures,1986;154:1.
3Beth Glostein, Pain relief for laboring patient: current techniques. ASA. Anual Refresher Course Lectures, 1995;153:1.
4Xiangmo Yan. Pain management in Chinese medicine. Management of chronic pain. The Second East - west International Conference on Pain Management,1995:310.
5Michael J C, Phillip OB. Neural blockade in clinical anesthesia and management of pain.second edition.JB Lippincott co,1987:593
7Meister 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
8Gaiser 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
9Fischer 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
10Campbell DC,Zwack R M,Crone LL,et al.Ambulatory labor epidural analgesia: bupivacaine versus ropivacaine[].Anesthesia and Analgesia.2000