超声诊断前置胎盘移位及其意义

A Study of Placenta Previa Migration by Ultrasonography

应用超声显像动态观察了468例孕妇,这些病饲在孕16～27周时胎盘均有不同程度前置,分娩时初孕组仅11.5％前置,经孕组为42.6％,说明妊娠过程中胎盘有移位情况存在。观察结果还表明:初孕组胎盘移位率(88.5％)显著高于经孕组(54.5％),两组病例后壁胎盘移位率(81.8％,45.8％)均显著低于前壁胎盘(96.2％,74.5％)(P<0.01)。本文还讨论了两组病例胎盘移位率差异的原因及B超定位诊断前置胎盘的时间问题。

468 pregnant women with placenta previa were observed by ultra-sonography during 16-27 weeks' gestation. In these cases, the primigravida women with placenta previa constituted 11.5%, and the multigravida women 42.6% during delivery. It was found that placenta migrated during pregnancy, and that primigravida group had higher proportion of placenta migration (88.5 %) than multigravida group (54.5 %). In these two groups, patients with posterior placenta had lower proportion of placenta migration (81.8 %, 45.8 %) than those with anterior placenta (96.2 %, 74.5 %) (P<0.01). In addition, we analyzed the cause of lower placenta migration in multigravida group and posterior placenta group, and ascertained the optimal time for diagnosing placenta previa.