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妊娠过期对母婴的危害尚未普遍重视。Ballantyne1902年即描述孕过期可发生死胎、产时窒息和产伤。1952年Clifford详述孕过期的子宫胎盘功能不全的危险及子宫胎盘损害程度增加可导致进行性胎儿丢失及围产期死亡。McClure-Browne的16,986例妊娠资料表明孕42周后围产期病率增加,认为此时常规引产对病率无改善。另有研究由于产前监护的发展常规引产有效。目前研究宫颈成熟剂和改进产前测验,希望能进一步减少过期妊娠引起的病率。一、定义、发生率和过期妊娠的影响大多数学者认为从末次月经起超过42周
The dangers of maternal and infant pregnancy have not been generally valued. In Ballantyne’s 1992 constitutional manifestations, there have been a number of births and deaths, asphyxia and birth trauma during labor. Clifford in 1952 details the risk of uterine placenta infertility and increased uterine placental damage can lead to progressive fetal loss and perinatal death. The 16,986 pregnancies in McClure-Browne indicate an increase in perinatal morbidity after 42 weeks of gestation, suggesting no improvement in prevalence at this time. Another study due to the development of prenatal care routine induced labor effective. The current study of cervical ripening agents and improve the prenatal test, hoping to further reduce the incidence of pregnancy caused by obesity. First, the definition, the incidence and the impact of overdue pregnancy Most scholars believe that from the last menstrual period over 42 weeks