材料与方法：应用彩色多普勒超声对32例胎心异常及49例胎心正常者进行了大脑中动脉、脐动脉的PI比值的对比分析。
Methods:By color Doppler ultrasound, we contrast the MCAPI/UAPI of the 32 cases which heart rate is abnormal with what of the 49 cases which heart rate is normal.
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.
脐动脉血流PI值异常组中围产儿预后不良的发生率显著高于正常组，其中异常组中小于胎龄儿的发生率显著高于正常组（P< 0 .0 5 ）。
The rates of adverse perinatal outcome, SGA in abnormal umbilical artery PI group were significantly higher than those in normal umbilical artery PI group ( P< 0.05 ).
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