Objective To observe pulsative index (PI), resistant index (RI) of placental helicine arteries by colour Doppler, analyses relation between PI, RI and developing of pregnant hypertension.
目的本研究采用彩色多普勒检测孕妇子
床螺旋动脉搏动指数（PI），阻力指数（RI），预测妊
征的发生、发展及预后。
Objective To observe pulsative index (PI), resistant index (RI) of placental helicine arteries by colour Doppler, analyses relation between PI, RI and developing of pregnant hypertension.
目的本研究采用彩色多普勒检测孕妇子床螺旋动脉搏动指数（PI），阻力指数（RI），预测妊征的发生、发展及预后。
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