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Abstract To analyze the change of ultrasonic blood flow parameters of pregnant women with placental implantation, and to study its correlation with their disease severity. Methods: 97 pregnant women with placental implantation treated were selected in observation group and 94 healthy pregnant women were selected in control group from January 2018 to may 2019. Color Doppler ultrasound was used to measure the blood flow index (FI), vascularization index (VI), vascularization flow index (VFI), blood flow pulsatility index (PI), resistance index (RI), and systolic and diastolic velocity ratio (S/D) of the women in the two groups. The value of the combined FI, VI, VFI, PI, RI, and S/D of the women for predicting their placental implantation was analyzed by logistic regression model. The correlation test was conducted by Spearman correlation detection. Receiver operator characteristic curve (ROC) was used to analyze the diagnostic efficiency of FI, VI, VFI, PI, RI, and S/D of the women for their placental implantation. Results: The values of the blood flow parameters, such as FI, VI, VFI, PI, RI, and S/D, of the women in the observation group were significantly higher than those of the women in the control group, and which of the women with severe placenta accreta were significantly higher than those of the women with adhesive placenta accreta. The values of FI, VI, VFI, PI, RI, and S/D of the women were positively correlated with their severity of the disease (all P＜ 0.05). The model of value of the combined detection of FI, VI, VFI, PI, RI and S/D of the women for predicting their placenta accreta was Log(P)=0.603×FI+0.677×VI+0.701×VFI+0.695×PI+0.626×RI+0.633×S/D+1.201, and the value of which for diagnosing placenta accreta had increased significantly (P＜0.05), with the area under the curve of 0.974, the sensitivity of 96.9%, and the specificity of 96.8%. Conclusion: The values of FI, VI, VFI, PI, RI, and S/D of the women with placental implantation are positively correlated with their severity of the disease, and the combined detection of which had higher efficacy for diagnosing the placental implantation.
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