EP17.13: Prediction of the second stage of labor duration using prelabor ultrasound markers
Year: 2026
Type: conference-abstract
Abstract: Objectives: To evaluate the association between sonographic pelvic angles-Angle of Progression (AOP) and Pubic Arch Angle (PAA)-measured at the time of rupture of membranes, and subsequent labor progression and mode of delivery, with the aim of assessing their potential role as objective parameters for early labor assessment.Methods: This prospective study included 65 women with singleton term pregnancies (37-42 weeks) presenting with prelabor rupture of membranes, including 38 nulliparous and 27 multiparous women.Transperineal ultrasound was performed shortly after rupture of membranes and prior to active labor to measure AOP and PAA using standardized acquisition techniques.Clinical outcomes included time to full cervical dilation, duration of the second stage of labor, and mode of delivery (spontaneous vaginal delivery, vacuum extraction, or Cesarean section).Subgroup analyses were performed according to parity.Results: AOP was associated with second-stage duration across the cohort (p = 0.044).Among nulliparous women, an AOP <98 • was associated with operative delivery (15.8%, p = 0.052).Maternal age was associated with PAA measurements, with narrower angles observed at higher maternal age (p = 0.021).In multiparous women, wider PAA values were associated with shorter time to full dilation (p = 0.011).Conclusions: Sonographic assessment of pelvic angles at the time of rupture of membranes provides measurable parameters associated with labor progression and delivery outcomes, supporting their role in early labor evaluation.
Language: English
Subfield: Obstetrics and Gynecology
Field: Medicine
Domain: Health Sciences
Open Access status: bronze
OpenAlex ID: W7204774797