McMahon M J, Kuller J A, Yankowitz J
University of North Carolina at Chapel Hill School of Medicine, USA.
Am Fam Physician. 1996 Aug;54(2):631-6, 641-2.
A post-term pregnancy is one that lasts beyond 42 weeks of confirmed gestational age. The goal of management in the post-term pregnancy is to avoid stillbirth, meconium aspiration and neonatal death. Ultrasonography obtained at term does not accurately predict gestational age. In pregnancies that progress beyond 41 weeks of confirmed gestational age, fetal well-being has been assessed by ultrasound evaluation of amniotic fluid volume, fetal breathing, fetal tone and fetal movement, in addition to nonstress testing. A definitive assessment plan for the post-term pregnancy should reduce the risk of maternal, fetal and neonatal morbidity.
过期妊娠是指妊娠持续超过已确认的孕周42周。过期妊娠管理的目标是避免死产、胎粪吸入和新生儿死亡。足月时进行的超声检查不能准确预测孕周。在已确认孕周超过41周的妊娠中，除无应激试验外，还通过超声评估羊水量、胎儿呼吸、胎儿肌张力和胎儿运动来评估胎儿健康状况。一个明确的过期妊娠评估方案应降低孕产妇、胎儿和新生儿发病的风险。
