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凡以往月经规则,末次经期准确,在这之前3个月未服避孕药而妊娠超过42周(294天)者称为过期妊娠。发生率约占妊娠总数的2.5～16%。一、原因过期妊娠的原因不明。一般认为年龄、产次与过期妊娠无关,但也有认为初孕妇的发生率较经产妇为多。有人提出与孕妇体质、遗传、孕激素过多、雌激素过少、代谢异常、维生素E 过多及胎儿有先天性畸形等有关。Nwosu 提到胎儿肾上腺皮质功能不
Where the previous menstrual rules, the last menstrual period accurate, in the previous 3 months without taking birth control pills and pregnancy more than 42 weeks (294 days) were referred to as expired pregnancy. The incidence of pregnancy accounted for about 2.5 to 16% of the total. First, the reason unexplained pregnancy. Generally believed that age, parity and pregnancy has nothing to do, but there are also believed that the incidence of early pregnant women than mothers. Some people put forward and pregnant women physical, genetic, progesterone too much, too little estrogen, metabolic abnormalities, excessive vitamin E and fetal congenital malformations and so on. Nwosu mentions fetal adrenal insufficiency