Using transperineal ultrasound to predict labor onset

Area of Science:

• Obstetrics and Gynecology
• Diagnostic Imaging
• Maternal-Fetal Medicine

Background:

• Accurate diagnosis of labor onset is crucial for managing elective labor induction.
• Predicting spontaneous labor timing is essential for optimal obstetric care.

Purpose of the Study:

• To evaluate transperineal ultrasound's efficacy in predicting spontaneous labor onset at term.
• To assess if ultrasound parameters improve counseling for labor induction.

Main Methods:

• Retrospective review of singleton pregnancies after 39 weeks gestation.
• Analysis of transperineal ultrasound parameters: progression distance (PD), angle of progression (AoP), subpubic arch angle (SPA), and width of symphysis pubis (WSP).

Main Results:

• All measured ultrasound parameters demonstrated high inter-observer reproducibility (ICC > 0.76).
• Width of symphysis pubis (WSP) correlated with spontaneous labor timing before 40 weeks (r=0.33, P<0.05).
• Subpubic arch angle (SPA) correlated with spontaneous labor timing in all women (r=0.31, P<0.05).

Conclusions:

• Antepartum transperineal ultrasound is a simple, objective method for assessing labor initiation.
• WSP and SPA measurements can predict labor onset, aiding in counseling for elective labor induction.