Zanke S
Geburtshilfe Frauenheilkd. 1985 Oct;45(10):710-3. doi: 10.1055/s-2008-1036121.
The incidence of early placenta previa amounted to 4 per cent in 4142 ultrasonic screening examinations at 16-20 weeks of gestation. The displacement of the placental edge away from the internal cervical os (migration) was observed in 90 per cent of 158 early placenta previa by prospective study. 86 per cent of the migrations terminated at 28th gestational week. An individual prognostic assessment on the basis of the primary ultrasonic findings cannot be given. The risk of a late abortion was increased (4 per cent). After the migration the rate of the perinatal complications did not change. A second ultrasonic screening scan has already been suggested in the 28th gestational week to select the late migrating and persistent cases and for well-timed performance of preventive treatment. The methodic aspects are discussed. The term placental migration should be used in the ultrasonic nomenclature.
在4142例妊娠16 - 20周的超声筛查中，前置胎盘早期发生率为4%。通过前瞻性研究，在158例前置胎盘早期病例中，90%观察到胎盘边缘远离宫颈内口（迁移）。86%的迁移在妊娠第28周终止。无法根据初次超声检查结果进行个体预后评估。晚期流产风险增加（4%）。迁移后围产期并发症发生率未改变。已建议在妊娠第28周进行第二次超声筛查扫描，以筛选出迁移较晚和持续存在的病例，并及时进行预防性治疗。文中讨论了方法学方面的问题。超声术语中应使用“胎盘迁移”一词。
