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当非计划妊娠错过了早期人工流产的时机,产前诊断中发现胎儿有遗传性疾病,B 超检查显示胎儿有先天性畸形以及孕妇合并某些内科疾患,不宜继续妊娠时,均需行中期引产以终止妊娠。但在妊娠中期,由于孕酮对子宫的抑制作用,宫缩难于发动;同时由于胎盘及胎儿骨骼已经形成,欲使胎儿娩出需要使宫颈有充分的扩张,而此时宫颈又不成熟。因此,中期引产较困难,合并症亦较多,如感染、出血、胎盘胎膜残留、宫颈裂伤、子宫破裂等。甚至曾有因中期引产造成羊水栓塞、过敏性休克或急性肾衰死亡的病例报道。为避免中期引产并发症的发生,对施行各种中期
When unplanned pregnancy missed the timing of early induced abortion, prenatal diagnosis of fetus with genetic disease, B-ultrasound showed that the fetus has congenital malformations and pregnant women with some medical conditions, should not continue with pregnancy, are required mid-term labor To terminate the pregnancy. However, in the second trimester, uterine inhibition of progesterone, uterine difficult to mobilize; the same time as the placenta and fetal bones have been formed, to make the fetus required to make the cervix have adequate expansion, and at this time the cervix is immature. Therefore, the mid-term more difficult to induce labor, complications are more, such as infection, bleeding, residual fetal placenta, cervical laceration, uterine rupture. There have even been cases of death from amniotic fluid embolism, anaphylactic shock or acute renal failure caused by mid-term induction of labor. In order to avoid the occurrence of mid-term labor induced complications, the implementation of a variety of medium-term