Pap G, Fügedi L
Zentralbl Gynakol. 1980;102(10):557-64.
The "Vidoson 635-S" high-speed ultrasonographic unit was used by the authors to examine 465 women pregnant in the second and third trimenons for the occurrence of bleeding. The following findings were obtained: NAD (no abnormality discovered), Placenta praevia totalis, Placenta praevia partialis lateralis, Placenta praevia partialis marginalis, deep adherence of placenta, early detachment of placenta, and uterus rupture. - Placental displacement was observed by repeated checking in 57 of 196 placentas with pathological findings. Placental prolapse observed between the twelfth and 20th weeks of pregnancy was defined as "early" Placenta praevia, and the birth canal was left in about 50 per cent of those cases. The authors' view about such phenomenon was that while the point of placental adherence was unchanged, some change was undergone by the uterus wall of which that part changed position to which the placenta adhered, the latter dislocation being caused by enlargement of the upper third of the passive uterus region and its part in the formation of the uterus cavity.
作者使用“Vidoson 635 - S”型高速超声诊断仪对465例妊娠中晚期妇女进行出血情况检查。结果如下：未发现异常（NAD）、完全性前置胎盘、部分性边缘前置胎盘、部分性侧方前置胎盘、胎盘植入、胎盘早剥及子宫破裂。对196例有病理发现的胎盘进行反复检查，发现57例有胎盘移位。妊娠12至20周间观察到的胎盘脱垂被定义为“早期”前置胎盘，约50%的此类病例保留产道。作者对这种现象的看法是，虽然胎盘附着点未变，但胎盘所附着部位的子宫壁发生了某种变化，子宫壁位置改变是由被动子宫区域上三分之一及其在子宫腔形成中的部分增大所致。
