Results There were no difference between two groups in visual analog scale, umbilical arteial blood pH, PCO2, PO2, apgar score , the first stage birth weight and postpartum hemorrhage (P>0. 05).

• 2组产妇血压、脉搏、活跃期时间、血气分析、胎心率、新生儿Apgar评分、胎儿体重及产后2h出血量差异均无显著性(P>0.；05)。