Bower S, Vyas S, Campbell S, Nicolaides K H
Department of Obstetrics and Gynaecology, King's College Hospital, London, UK.
Ultrasound Obstet Gynecol. 1992 Jul 1;2(4):261-5. doi: 10.1046/j.1469-0705.1992.02040261.x.
In a cross-sectional study of 215 healthy women with singleton pregnancies at 18-42 weeks' gestation, color Doppler imaging was used to identify the main uterine arteries for subsequent pulsed Doppler studies. Flow velocity waveforms were obtained and indices of impedance, mean blood velocity and vessel diameter were measured, and the total volume of blood flow to the uterus was calculated. Impedance to flow decreased, I whereas blood velocity and volume flow increased significantly with gestation. Furthermore, impedance to flow was lower and velocity higher in the placental uterine artery, i.e. closest to the main bulk of the placenta, than in the non-placental artery.
在一项针对215名妊娠18至42周的单胎健康孕妇的横断面研究中，使用彩色多普勒成像来识别主要子宫动脉，以便后续进行脉冲多普勒研究。获取血流速度波形，测量阻抗指数、平均血流速度和血管直径，并计算子宫的总血流量。随着孕周增加，血流阻抗降低，而血流速度和血流量显著增加。此外，胎盘子宫动脉（即最靠近胎盘主体的动脉）的血流阻抗低于非胎盘动脉，血流速度则更高。
