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以往常认为不可能在胎膜自然破裂、阴道出血、严重胎儿窘迫等症状出现前诊断前置血管。作者报道以实时超声显像术产前诊断前置血管。病例报道:患者29岁,G_3P_2,1983年11月因诊断前置胎盘住院,预产期1984年2月6日。妊娠中期曾有阴道出血,卧床休息后止。超声检查显示后壁边缘性前置胎盘,随胎儿生长转为低置性。但在内口上方出现一低回声区,似为副胎盘。实时超声检查显示一条与脐带一致的搏动区。Doppler检查进一步证实。此种搏动区不随胎母体位变化而改变。超声随访,此种搏动之血管直接在内口上方与副胎盘相连接。诊断为前置血管,并在剖宫产时证实。切开子宫,见脐血管呈帆状,血管由胎盘向副胎盘伸展,途中横过内口。母子预后良好。讨论:1979年虽有文章提出以超声显像诊断前
It was previously thought impossible to diagnose pre-vasculature before the natural rupture of membranes, vaginal bleeding, severe fetal distress and other symptoms appeared. The authors report prenatal diagnosis of prevascular blood by real-time ultrasound imaging. Case Report: Patient 29 years old, G_3P_2, November 1983 hospitalized for diagnosis of placenta previa, expected date of February 6, 1984. Have had vaginal bleeding in the second trimester of pregnancy, bed rest only. Ultrasound examination revealed a posterior wall marginal placenta previa, with the fetus to low-sexual growth. However, there is a hypoechoic area above the mouth, it seems to be the secondary placenta. Real-time ultrasonography showed a beat zone consistent with the umbilical cord. Doppler examination further confirmed. Such beating zone does not change with the fetal body position change. Ultrasound follow-up, such pulsating blood vessels directly above the mouth and vice-placenta connected. Diagnosis of pre-vascular, and confirmed at cesarean section. Cut the uterus, umbilical vessels were seen sails, blood vessels from the placenta to the paracentral extension, the way across the mouth. Mother and child prognosis is good. Discussion: Although there are articles made in 1979 before the diagnosis of ultrasound imaging