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
妇子宫胎
床螺旋
指数（PI），阻力指数（RI），预妊高征的发生、发展及预后。
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