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孕妇自然流产分早期(<12周)流产和晚期流产。凡是16周以前发生者,大多数与胎儿染色体异常有关,而17周以后流产的胎儿本身大多正常,及时有效地治疗可以预防流产发生。在实际生活中,不少生育期的女性曾有过流产史。据报道,这些妇女一次流产者约15％,两次流产者约4％,三次流产者约3％。如果连续三次以上流产,则称为习惯性流产。从女性怀孕时的年龄来看,年龄越大越易发生流产。20—34岁妊娠者发生率为12％,而35—44岁妊娠者发生率高达31％。 妊娠后为什么会自然流产呢?这是因为人类妊娠受多方面的影响,当某些因素发生改变时,胎儿随时可能发生意外,出现流产。目前,已知的因素可分为如下几种:
Pregnant women spontaneous abortion early (<12 weeks) abortion and late abortion. All occurred 16 weeks ago, most of the fetal chromosomal abnormalities, and 17 weeks after the abortion of the fetus itself is mostly normal, timely and effective treatment can prevent miscarriage. In real life, many women during their reproductive years had history of abortion. It is reported that these women are about 15% of the first abortion, about 4% of the two abortions and about 3% of the three abortions. If more than three consecutive abortion, then known as habitual abortion. From the age of women when pregnant, the older the more prone to miscarriage. The incidence of pregnancy at 20-34 years is 12%, while the incidence of pregnancy at 35-44 is as high as 31%. Why after pregnancy spontaneous abortion it? This is because many aspects of human pregnancy, when certain factors change, the fetus may be unexpected at any time, abortion. At present, the known factors can be divided into the following categories: