[Investigate of three-dimensional power Doppler ultrasound used in placental perfusion assessment in pre-eclampsia pregnancies].

(1) Placental blood flow perfusion of the severe pre-eclampsia and pre-eclampsia with chronic hypertension of pregnancy decreased resulting in clinically lower placental weight, birth weight and gestational age at delivery, but there were no obvious differences in umbilical blood flow S/D values. (2) The investigation was helpful to clinical diagnosis in the placenta perfusion of pre-eclampsia by three-dimensional power Doppler ultrasound.