Objective To compare the analgesic effect and motor block of Ropivacaine Mesilate with bupivacaine at low concentration in laboring parturient using patient-controlled epidural analgesia(PCEA).

• 目的：对低浓度布比卡因和甲磺酸罗哌卡因自控硬膜外分娩镇痛的效果。