Sand H
Acta Obstet Gynecol Scand. 1977;56(2):109-13. doi: 10.3109/00016347709158351.
741 women suspected of placenta praevia were submitted to ultrasonic scanning during the second and/or third trimesterr of pregnancy. In 61 an abnormal placental site was diagnosed. During Caesarean section, carried out in 46 of these cases, the location was compared with the ultrasound findings. The scanning diagnosis during the last trimester correlated with the findings at delivery. At scanning after the 35th week the diagnosis differed in only 4 cases. In all 4 there was a question of a low-lying placenta versus partial placenta praevia. During the second trimester diagnosis of low-lying placenta were revised in several cases at later scans. It is discussed whether these early diagnoses of an abnormal placental site, which later becomes normal, indicate a migrating placenta and/or an uncertainty of the scanning method. Early diagnosis of low-lying placentae should be checked by repeat scans.
741名疑似前置胎盘的女性在妊娠中期和/或晚期接受了超声扫描。其中61例被诊断为胎盘位置异常。在这61例中的46例进行剖宫产时，将胎盘位置与超声检查结果进行了对比。妊娠晚期的扫描诊断与分娩时的结果相符。在第35周后进行扫描时，诊断仅在4例中存在差异。在这4例中，均存在低置胎盘与部分前置胎盘的疑问。在妊娠中期诊断为低置胎盘的几例患者，在后来的扫描中诊断被修正。文中讨论了这些早期诊断为胎盘位置异常但后来变为正常的情况，是否表明胎盘迁移和/或扫描方法存在不确定性。前置胎盘的早期诊断应通过重复扫描进行核实。
