Is there an association between sonographically determined occipito-transverse position in the second stage of labor and operative delivery?

Objective: To evaluate if ultrasound-determined occipito-transverse position early in the second stage of labor is associated with operative delivery.

Design: Retrospective review of two prospective cohort studies.

Setting: An Australian tertiary referral hospital.

Does occiput posterior position in the second stage of labour increase the operative delivery rate?

Objectives: To assess the impact of occipito-posterior position in the second stage of labour on operative delivery.

Methods: Double-blinded prospective cohort study of ultrasound determined occiput-posterior position during the second stage of labour compared with occiput-anterior position. The primary outcome was operative (caesarean section, forceps or vacuum) delivery.