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采用脉冲式多普勒测定１０１例高危妊娠的脐动脉（ＵｍＡ）收缩期最大血流速度（Ｓ）与舒张末期速度（Ｄ）的比值（ＵｍＡＳ／Ｄ）；制作受试者工作曲线（ＲＯＣ曲线）；并对高危妊娠１９例，正常妊娠１０例妇女（Ａ组）进行ＵｍＡＳ／Ｄ值与胎盘病理检查。结果显示：ＵｍＡＳ／Ｄ值为２．８作为最佳临界点；该点预测高危妊娠不良结局的敏感性为７０．６％，特异性为９７．６％；高危妊娠妇女中，ＵｍＡＳ／Ｄ＜２．８者９例（Ｂ组），Ｓ／Ｄ≥２．８者１０例（Ｃ组）；Ｃ组胎盘三级绒毛于中的平均肌性小动脉数明显少于Ｂ组及Ａ组。揭示：ＵｍＡＳ／Ｄ值与胎盘三级绒毛干中的肌性小动脉数有明显关系。
The UmAS / D ratio of maximum systolic velocity (S) to diastolic velocity (D) was measured by pulsed Doppler in 101 high-risk pregnancies. The receiver operating curve (ROC curve ). UmAS / D and placental pathology were also performed in 19 high-risk pregnancies and 10 normal pregnant women (group A). The results showed that the UmAS / D value was 2.8 as the best cut-off point. The sensitivity and specificity of this point to predict the adverse outcome of high-risk pregnancy were 70.6% and 97.6% respectively. Among the high-risk pregnant women, UmAS / D < 2.8 in 9 cases (group B), 10 cases in group S (S / D≥2.8) (group C). The average number of muscular small arteries in group C was significantly less than those in group B and group A. Revealed: UmAS / D values and placental third level fluff dry muscle in a significant relationship between the number of arterioles.