Abstract：Objective To analyze the effect of prenatal three-dimensional power Doppler ultrasound in evaluating the severity of placental implantation. Methods Through the convenient sampling method, 100 pregnant women with placenta previa and placenta accreta treated in Jiangxi Maternal and Child Health Hospital from January 2017 to December 2020 were selected as the research objects. According to the severity of placenta implantation, the patients were divided into severe group (placenta attached to lower uterine scar site, 32 cases) and mild to moderate group (placenta not attached to lower uterine scar site, 68 cases). Another 100 normal women with placenta in the anterior wall were selected as the control group. All maternal antenatal achieved three-dimensional power doppler ultrasound and cesarean section surgery and the postoperative pathological results as the gold standard. The placental flow index (FI), vascular flow index (VFI) and peak blood flow velocity (PSV) were compared among the three groups, and the diagnostic efficacy of FI, VFI and PSV for severe placental implantation was analyzed. Results FI, VFI and PSV of the severe group and mild-moderate group were higher than those of the control group, and FI, VFI and PSV of the severe group were higher than those of the mild-moderate group, and the differences were statistically significant (P<0.05). The sensitivity, specificity, Youden index and area under curve (AUC) of VFI in the diagnosis of severe placental implantation were higher than those of FI and PSV. Conclusion Three dimensional power Doppler ultrasound is an effective way to diagnose placental implantation. It has high application value in evaluating the severity of placental implantation and is worthy of clinical attention.
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