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宫胎盘
动脉搏动指数（PI），阻力指数（RI），
测妊高征的发生、发展及
。
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宫胎盘动脉搏动指数（PI），阻力指数（RI），测妊高征的发生、发展及。
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