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过期妊娠的定义,发生率及其原因:一般从末次月经的开始日算起,超过42周(294日)者称为过期妊娠。但对这一问题的看法,目前也还有争论,因此,除详细了解孕妇的末次月经,月经周期外,尚需注意胎儿的大小以及发现胎心和胎动的时期,用以校正依 Naegele 公式计算的予产期。过期妊娠的发生率,资料报道很多,但差异较大,由3. 2%(真柄)至16%(小畑)不等。作者在分析妊娠29周后分娩的1900例中,妊娠超过42周者共99例,占5. 2%。
The definition, incidence and reasons of overdue pregnancy: Generally, the period from the start of the last menstrual period, more than 42 weeks (294 days) are referred to as expired pregnancy. However, there is still controversy on this issue. Therefore, in addition to knowing the last menstrual cycle and the menstrual cycle of pregnant women, it is necessary to pay attention to the size of the fetus and the period of detecting the fetal heart rate and fetal movement to correct Naegele’s formula The pre-term. The incidence of overdue pregnancy, the information reported a lot, but the difference is large, from 3.2% (true handle) to 16% (small 畑) range. The authors in the analysis of 29 weeks after delivery of 1900 cases of pregnancy, a total of 99 cases of pregnancy over 42 weeks, accounting for 5.2%.