Prenatal Ultrasound Instrument Score and Clinical Significance of Central Placenta Previa Combined with Placenta Implantation
Objective:To investigate the clinical value of prenatal ultrasonography in the diagnosis of dangerous placenta previa with placenta accreta.Methods:75 patients with dangerous placenta previa admitted to our hospital from January 2019 to February 2023 were selected as the research objects,all of whom underwent prenatal ultrasound examination.Then,the results of postpartum pathological examination were taken as the basic basis,and they were divided into placenta implantation group and non-implantation group,and the detection rate of ultrasonic diagnosis was observed.The pregnancy outcome,the number of cesarean sections,age and imaging characteristics of the implanted group and the non-implanted group were compared and analyzed.Results:Among the 75 patients in this group,ultrasound prediction combined with implantation in 40 cases,no implantation in 35 cases,surgical pathological diagnosis combined with placenta implantation in 30 cases,45 cases without placenta implantation,there was no significant difference between ultrasound score and pathology(P>0.05).Postplacental space disappearance,placental thickening,cervical enlargement and myometrium <2mm in the implantation group were higher than those in the non-implantation group(P<0.05).The number of cesarean section ≥2,hysterectomy,age ≥35 years and postpartum hemorrhage rate in the implantation group were higher than those in the non-implantation group(P<0.05).ROC curve analysis showed that the best dividing point of ultrasonic sign score was 6 points,and the area under ROC curve(AUC)and 95%CI of ultrasonic sign score for the diagnosis of placenta implantation were 0.862 and 0.806-0.918,respectively.Conclusion:In the clinical diagnosis of patients with dangerous placenta previa complicated with placenta accreta,ultrasonic examination has high accuracy,non-invasive,cheap and reproducible,and can be used as a safe and effective examination method.