A cross sectional transvaginal color Doppler study of the uteroplacental circulation was performed on 105 pregnant women with normal intrauterine pregnancy. Gestational age was ranged from 4 to 12 weeks. The blood flow velocity waveforms were obtained from four separate parts of the uteroplacental circulation: uterine, arcuate, radial, and spiral arteries. The resistance index (RI) and peak systolic velocity (PSV) were analyzed. The RI significantly decreased and PSV increased with advancing gestation in uterine artery and its branches (P<0 05). The RI gradully decreased from uterine artery through arcuate, radial to spiral arteries (P<0 05). At the same time, the PSV decreased from uterine artery then arcuate to radial artery, but PSV in spiral arteries were higher than that in radial artery (P<0 05). The results showed that transvaginal color Dopper ultrasonography was a simple, reliable method to assess the uteroplacental circulation in the early pregnancy; the detection of PSV was useful parameter for better understanding of physiological and pathophysiological hemodynamic changes as well as RI.
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