8Soni AK,Miller CG,Pratt SD. Low dose intratheeal roPivaeaine with or with out sufentanil Provides effeetive analgesia and dose not impair motor strength during labor:a pilot study[J].Canadian Journal of Anesthesia,2001,(07):677-680.
9Owen MD,Thomas JA,smith T. Ropivacaine 0.075% and bupivaeaine 0.075 % with feniangl 2mierog/ml are equivalent for labor epidural analgesia[J].Anesthesia and Analgesia,2002,(01):179-183.