为防止延期妊娠和过期妊娠，降低围产儿窒息率及病死率，对妊娠合并某些疾病以及孕周超过４０周的孕妇给予适时引产是产科常见的治疗措施，而宫颈条件则是引产成功的关键。引产成功率与宫颈成熟有关，宫颈不成熟者，引产失败率高达５０％［１］。我们通过随机对照研究，观... To prevent postponement of pregnancy and expired pregnancy, reduce perinatal asphyxia and mortality, the timely treatment of pregnant women with certain diseases and gestational weeks more than 40 weeks pregnant induction is a common obstetric treatment, and cervical conditions is the key to successful induction of labor . The success rate of induction of labor and cervical maturity, cervical immature, induction failure rate as high as 50% [1]. We pass the randomized controlled study, view ...