The Predictive Value Of Anterior Uterocervical Angle And Cervix Length Measured By Transvaginal Ultrasound In Twin Preterm Delivery

Purpose: To investigate the value of transvaginal ultrasonography measuring anterior uterocervical angle(ACA)and cervical length(CL)in predicting premature delivery of twin pregnancies.Methods:A total of 75 pregnant women aged 20-35 years who underwent prenatal ultrasound cervical examination for twin pregnancy in our hospital were collected.The pregnancy methods included natural conception and artificial insemination.ACA and CL were measured by transvaginal ultrasound in the third trimester(28-32 weeks of gestation),and the measurement results were recorded.The basic clinical data of pregnant women were collected and their pregnancy outcomes were tracked.According to the occurrence of preterm birth,the preterm birth group and term birth group were divided into two groups.ACA and CL were compared between the two groups to analyze the value of ACA and CL in predicting preterm birth and the clinical value of the combination of ACA and CL in predicting preterm birth.Results: Seventy-five twin-pregnancy women were included in this study,32 cases(43%)in the preterm group and 43 cases(57%)in the full-term group.ACA and CL in preterm delivery group were(115.06±13.84)° and(26.33±7.98)mm,while ACA and CL in term delivery group were(92.90±12.89)° and(33.68±5.61)mm.There were statistically significant differences in ACA and CL between the two groups(P <0.05).ROC curve showed that the area below the line of ACA and CL were 0.898 and0.795,respectively,corresponding to the optimal critical value of 104.31° and 28.35 mm,respectively.The sensitivity and specificity of ACA for predicting premature birth were 87.5% and 88.4%,respectively.The sensitivity and specificity of CL in predicting preterm birth were 71.9% and 90.7%,respectively.The area under ROC curve of ACA and CL combined was 0.903,and the sensitivity and specificity of ACA and CL combined in predicting preterm birth were 87.5% and 90.7%,respectively.Conclusion : Both ACA and CL measured by transvaginal ultrasound in the late trimester are effective indicators for predicting twin preterm birth,and the predictive value of ACA is better than CL measured at the same time.The combination of the two can improve the clinical value of predicting twin preterm birth.