Moya F, Grannum P, Pinto K, Bracken M, Kadar N, Hobbins J C
Obstet Gynecol. 1985 Mar;65(3):319-22.
The use of ultrasound to identify the fetus at risk for postmaturity among postterm pregnancies was evaluated. The ultrasound findings in 85 postterm pregnancies were reviewed. No grade 0 or grade 1 placentas were observed and grade 2 and 3 placentas were found with similar frequency. The incidence of advanced postmaturity was 12.9%. Advanced postmaturity was found with grade 2 and 3 placentas. Oligohydramnios was very common (81.8%) among pregnancies resulting in postmaturity. The neonatal ponderal index was higher with grade 2 placentas than with grade 3 placentas. The presence of immature placentas (grade 0 or 1) is rare after 42 weeks of gestation. Placental grading cannot be used to predict postmaturity.
评估了使用超声识别过期妊娠中存在过期产风险胎儿的情况。回顾了85例过期妊娠的超声检查结果。未观察到0级或1级胎盘，2级和3级胎盘的发现频率相似。过期产的发生率为12.9%。2级和3级胎盘均出现过期产。羊水过少在导致过期产的妊娠中非常常见（81.8%）。2级胎盘的新生儿体重指数高于3级胎盘。妊娠42周后未成熟胎盘（0级或1级）很少见。胎盘分级不能用于预测过期产。
