结果 1、DMl视网膜中央动脉（CRA）的收缩期峰值血流速度（PSV）较对照组明显减低，D暾2舒张末期流速（EDV）减低，DM4以后，平均血流速度（MV）、搏动指数 （PI）、阻力指数（RI）的改变与对照组比较有显著性差异（P（0，05）：视网膜中央...
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舒张末期流速餐前和餐后各时点比较差异有统计学意义（P<0.01），餐后各时点比较差异无统计学意义（P>0.05）。
Significant difference was found between fasting EDV value and postprandial values(P<0.01), but no difference was found among values at various postprandial time points(P>0.05).
目的探讨脐动脉收缩期血流峰值（S）与舒张末期血流速度（D）的比值（S/D）对预测胎儿宫内缺氧的临床价值。
Objective This paper is to investigate the ratio of the systolic peak value and the end-diastolic velocity of blood flow (S/D value) and its clinical value, which can predict fetal anoxia.
目的评价肝素对改善妊娠中晚期脐动脉收缩期最大血流速度（S）与舒张末期血流速度（D）的比值异常的临床效果。
ObjectiveTo evaluate the efficiency of heparin on the ratio of peak systolic to least diastolic flow velocity (S/D) of umbilical artery flow velocity waveforms at second-trimester pregnancies.
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