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.
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。
The stillbirth group(delete those with placental abruption)was significantly higher in umbilical cord blood S/D value and lower blood pressure(P0.01).
死胎组（删除胎盘早剥者）脐动脉S/D值高于对照组，血压低于对照组（P值均〈0.01）。
The stillbirth group(delete those with placental abruption)was significantly higher in umbilical cord blood S/D value and lower blood pressure(P0.01).
死胎组（删除胎盘早剥者）脐动脉S/D值高于对照组，血压低于对照组（P值均〈0.01）。
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