| Objective: To investigate the risk factors affecting the degree of invasive placenta previa(Pernicious Placenta Previa,PPP)implantation,the effectiveness of color Doppler ultrasound in prenatal diagnosis of PPP and the predictive value of ultrasound for PPP placenta accreta.Methods :87 PPP patients who gave birth in obstetrics department of the first clinical medical school of xinjiang medical university from october 2018 to october 2019 were selected as the research subjects.The patients were divided into A groups PPP placenta accreta group,B group and placenta group.Adhesion group.Multivariate Logistic regression analysis was carried out to find out the risk factors or predictors of PPP degree of placenta accreta and to calculate the prenatal diagnostic efficacy of color Doppler ultrasound for PPP.Results :1.The proportion of cesarean section ? 2 times in A group,the amount of postpartum hemorrhage,the rate of blood transfusion,and the rate of preoperative interventional surgery were higher than those in B group.2.comparison between the two groups of newborns in the neonatal intensive care unit(Neonatal Intensive Care Unit,NICU),premature delivery rate,hysterectomy rate,bladder rupture,hemorrhagic shock rate,etc.The difference was not statistically significant.3.multivariate Logistic regression analysis found that placental myometrial blood flow signal and placental posterior blood flow signal were predictors of PPP with placenta accreta.the sensitivity and specificity of 4.color doppler ultrasound diagnostic PPP were80.7% and 83.3%,respectively;the area under the ROC curve(Area under the Curve of ROC,AUC)was 0.820.The diagnostic efficacy of the combined prediction index of 5.color Doppler ultrasound for PPP was:sensitivity :94.7%;specificity :93.3;AUC :0.938.Conclusion :1.The number of cesarean section is a risk factor affecting the degree of PPP placenta accreta.2.PPP the deeper the degree of implantation,the higher the intraoperative blood loss,blood transfusion rate and preoperative interventional surgery rate.3.placental myometrial blood flow signal and placental posterior blood flow signal were used as predictors of PPP with placenta accreta.4.color doppler ultrasound combined with predictive indicators can improve the effectiveness of prenatal diagnosis of PPP. |
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