2Mousa WF, A1-Metwalli R, Mostafa M. Epidural analgesia during labor vs no analgesia A comparative study[J]. Saudi J Anaesth, 2012, 6(1) 36-40.
3Purdie NL, Mc Grady EM. Comparison of patient-controlled epidural bolus administration of O. % ropivacaine and O. 1% levobupivacaine, both with O. 0002 fentanyl,for analgesia during labour[J]. Anaes-thesia,2004,59(2):133 137.
4Knudsen K, Beckman Suurkiila M, Blomberg S, et al. Cent ral nervous and cardiovascular effects of i.v. infusions of ropivacaine, bupivacaine and placebo in volunteers[J]. Br J Anaesth, 1997,78(5) : 507 514.
5Higgins J,Green S. Cochrane handbook for systematic reviews of in- terventions version 5. 0. 0 [ M]. The Cochrane Collaboration: Jolm Wiley Sons, 2008 42-47.
6Reynolds F, Sharma FK, Seed PT. Analgesia in labor and fetal addbase balance: A metanalysis comparing epidural with systemic opioid analysia[J] BJOG,2003,109(12) :1344-1353.
7Halpem SH, Walsh V. Epidural ropivacaine versus bupivacaine for la bor A mata-analysis[J]. Anesth Analg, 2003,96(5) ： 1473-1479.
8Yamashita A, Matsumoto M, Matsumoto S, et al. A comparison of the neurotoxic effects on the spinal cord of tetracaine,lidocaine, bupiv aine, and ropivacaine administered intrathecaUy in rabbits[J]. Anesth Analg,2003,97(2) : 512-519.
