The correlation between ultrasound monitoring parameters of uterine artery blood flow in early pregnancy and placental position in normal pregnancy
正常妊娠孕早期子宫动脉血流超声监测参数与胎盘位置的相关性

摘要

目的 探究正常妊娠孕早期子宫动脉血流速率波形与胎盘位置的相关性。方法 自2024年2月起，本院开始收集妇产科正常妊娠孕早期进行检查的孕妇资料，至2025年8月止共纳入55例，按照胎盘位置分组：右侧胎盘组、左侧胎盘组、居中胎盘（前、后壁胎盘）组。检测孕妇双侧子宫动脉血流速率波形，包括阻力指数（英简RI）、搏动指数（英简PI）、收缩期峰值流速与舒张末期流速的比值（英简S/D），并分析子宫胎盘血流速率波形与胎盘位置的相关性。结果 左侧胎盘组孕妇右侧子宫动脉PI明显高于居中胎盘组（P<0.05）；PI、RI、S/D明显高于右侧胎盘组（P<0.05）。左侧胎盘组孕妇左侧子宫动脉PI、RI、S/D明显低于右侧胎盘组（P<0.05）。结论 正常妊娠孕早期子宫动脉血流速率波形与胎盘位置具有相关性，且存在一定特征，能够为临床早期诊断提供有力的参考。

Abstract

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.