Le Huong Lam, Nguyen Huy Vu Quoc, Le Tam Minh, Vo Lam Hoang
Hue University Hue University of Medicine and Pharmacy Department of Obstetrics and Gynecology Hue Vietnam Department of Obstetrics and Gynecology, Hue University of Medicine and Pharmacy, Hue University, Hue, Vietnam.
Rev Bras Ginecol Obstet. 2025 Mar 17;47. doi: 10.61622/rbgo/2025rbgo5. eCollection 2025.
To determine the validity of the angle of progression (AoP) in predicting delivery mode among women in the second stage of labor.
This prospective cohort study was conducted at the Obstetrics and Gynecology unit (OBGYN) of two hospitals in Vietnam. Transperineal ultrasound was performed for each woman to measure the progression angle in the second phase of labor. .
A total of 725 women with singleton pregnancies with cephalic presentation at term.
Transperineal ultrasound was used to measure the angle of progression in the second labor phase and to identify the delivery method.
The rate of vaginal birth in women with an AoP ≥ 120° on transperineal ultrasound was 70.2%. The optimal cutoff point of AOP ≥122° with sensitivity and specificity for vaginal birth were 87.8% and 80.7%, respectively the area under the ROC curve of 0.887 (p<0.0001). The study's sample size was restricted owing to deficiencies in resources and time.
The likelihood of achieving spontaneous vaginal delivery can be predicted by the angle of progression measured with transperineal intrapartum ultrasonography during the second stage of labor in women.
确定产程角度（AoP）在预测第二产程女性分娩方式方面的有效性。
这项前瞻性队列研究在越南两家医院的妇产科进行。对每位女性进行经会阴超声检查，以测量第二产程的进展角度。
共有725名单胎足月头位妊娠女性。
采用经会阴超声测量第二产程的进展角度并确定分娩方式。
经会阴超声检查显示AoP≥120°的女性阴道分娩率为70.2%。AoP≥122°作为阴道分娩的最佳截断点，敏感性和特异性分别为87.8%和80.7%，ROC曲线下面积为0.887（p<0.0001）。由于资源和时间不足，该研究的样本量受到限制。
在女性第二产程中，经会阴产时超声测量的进展角度可预测自然阴道分娩的可能性。
