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过期妊娠是近年来产科临床逐渐受到重视的问题,因其对母婴可能产生不良影响,所以也是围产期医学上的一个问题。过期妊娠存在生理和病理两种情况,后者往往危及胎儿生命,主要由于胎盘老化导致胎盘功能不全所致,故有胎盘功能不全综合征之称。在初产妇,过期妊娠是造成围产期死亡的仅次于早产的主要原因之一。过期妊娠的定义至今尚不能统一。国内外多数学者认为,凡月经周期正常的孕妇,妊娠超过预产期2周尚未分娩者(从末次月经的开始日算起、超过294天),称为过期妊娠。其发生率在6.5～11%之间。
Obstetrics and gynecology clinics in recent years, the gradual attention to the problem, because of its possible adverse effects on mothers and babies, it is also a perinatal medical problem. Exposed pregnancy there are two physiological and pathological conditions, the latter often endanger the life of the fetus, mainly due to placental aging caused by incomplete placental insufficiency, it is placental dysfunction syndrome. In primipara, one of the major causes of perinatal death is second only to preterm birth. The definition of overdue pregnancy so far can not be unified. Most scholars at home and abroad that pregnant women with normal menstrual cycle, pregnancy more than expected delivery period of 2 weeks have not delivered (from the beginning of the last menstrual period, more than 294 days), known as expired pregnancy. The incidence of 6.5 to 11%.