Pain and Regional Anesthesia Determination of the Full Dose-Response Relation of Intrathecal Bupivacaine, Levobupivacaine, and Ropivacaine, Combined with Sufentanil, for Labor Analgesia.

• 评价分娩镇痛时鞘内注射布比卡因,左旋布比卡因,和罗哌卡因,复合苏芬太尼的剂量-效应关系。