International Journal of Clinical Research

Objective To investigate the correlation between the waveform of uterine artery blood flow velocity and placental position in early pregnancy. Methods Starting from February 2024, our hospital began collecting data from pregnant women who underwent early pregnancy examinations in obstetrics and gynecology. By August 2025, a total of 55 cases were included and divided into three groups based on placental position: right placenta group, left placenta group, and center placenta (anterior and posterior wall placenta) group. Detect the blood flow velocity waveform of bilateral uterine arteries in pregnant women, including resistance index (RI), pulsatility index (PI), and the ratio of peak systolic flow velocity to end diastolic flow velocity (S/D), and analyze the correlation between uterine placental blood flow velocity waveform and placental position. Results The PI of the right uterine artery in the left placenta group was significantly higher than that in the center placenta group (P<0.05); PI, RI, and S/D were significantly higher than those in the right placenta group (P<0.05). The PI, RI, and S/D of the left uterine artery in pregnant women with the left placenta group were significantly lower than those in the right placenta group (P<0.05). Conclusion The waveform of uterine artery blood flow rate in early pregnancy is correlated with placental position and has certain characteristics, which can provide strong reference for early clinical diagnosis.

Normal pregnancy; Early pregnancy; Uterine placental blood flow velocity waveform; Placental position; Relevance