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前置胎盘是中晚期妊娠阴道出血的最常见原因,如不能早期发现和及时治疗,常引致大量出血而危及生命。超声检查是目前胎盘定位的首选方法。某作者通过超声诊断确定完全性前置胎盘6例,部分性前置胎盘8例,边缘性前置胎盘5例,低置胎盘10例,共计29例。经孕妇分娩后证实为前置胎盘者28例,超声诊断前置胎盘的符合率为96.6％;1例为先兆流产,超声诊断前置胎盘的误诊率为3.4％。
Placenta previa is the most common cause of vaginal bleeding in late pregnancy, such as early detection and timely treatment, often lead to massive bleeding and life-threatening. Ultrasonography is the preferred method of placental localization. One author identified 6 cases of complete placenta previa by ultrasound diagnosis, 8 cases of partial placenta previa, 5 cases of marginal placenta previa and 10 cases of placenta accreta, a total of 29 cases. Twenty-eight cases were diagnosed as placenta previa after delivery. The coincidence rate of ultrasonic diagnosis of placenta previa was 96.6%. One case was threatened abortion. The misdiagnosis rate of placenta accreta was 3.4%.