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中期妊娠引产（中孕引产）是临床常用的一项终止妊娠的措施。具体方法很多，其中水囊引产法是较常用和有效的方法之一。进一步提高中孕水囊引产的效果，减少副作用具有较大的临床意义。米非司酮（nil．pristone）作为一种抗早孕药物试用于！de床，巳有大量研究，在中孕和晚孕期
Induction of labor in the second trimester (miscarriage) is a common clinical termination of pregnancy measures. Many specific methods, including water bag induction method is one of the more common and effective method. Further improve the effect of induction of labor in the second trimester sac, reduce side effects have great clinical significance. Nifepristone (nil.pristone) as an anti-pregnancy drug trial! There has been a large body of research, both in the first trimester and in the second trimester