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以往由于缺少非侵入血管性诊断方法,故难于研究,胎儿胎盘循环。近有非侵入性超声多普勒测定各种胎儿血管内血流情况的报道,测定脐血流速率及收缩期至扩张期末峰值比率(S/D)已被用来估价胎盘血管阻力。S/D 比率上升与小于胎龄儿、双胎间输血、先兆子瘸等不良国产结果的增加有关。最近的报道指出,它既可作为产前胎儿监护的辅助诊断,又可作为一种基础的监护方法,传统的非应激试验(NST)、宫缩激惹试验(CST)和生物物理指标作为正常健康胎儿良好的预测方法,但对预测已有病理情况的胎儿效果很差,具有30～70％的假阳性。
In the past because of the lack of non-invasive vascular diagnostic methods, it is difficult to study, fetal placental circulation. Nearly noninvasive ultrasound Doppler measurements of intravascular blood flow in a variety of reports, the determination of umbilical blood flow rate and systolic to end of the peak expiratory expansion ratio (S / D) has been used to assess the resistance of placental blood vessels. The increase in S / D ratio is associated with an increase in poor domestic outcomes such as less than gestational age, twins transfusion, and preeclampsia. Recent reports point out that it can serve both as an adjunct to prenatal fetal monitoring and as a basis for custody, traditional non-stress test (NST), contractile provocation test (CST) and biophysical indicators Normal and healthy fetuses have good predictive methods, but they have poor prognosis for fetuses with predicted pathology, with 30-70% false positives.