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Does occiput posterior position in the second stage of labour increase the operative delivery rate?
Wendy J Carseldine1, Hala Phipps, Shannon F Zawada
1Maternity and Gynaecology Department, John Hunter Hospital, Newcastle, Australia. wendy.carseldine@hotmail.com
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.
Results:
A total of 68% (13/19) women in the occiput-posterior group, and 27% (39/141) in the occiput-anterior group had an operative delivery (unadjusted: P < 0.001). Caesarean section was performed in 37% and 5%, respectively (P < 0.001). The occiput-posterior group had a longer second stage (mean 2 h 59 minutes vs 1 h 54 minutes; P = 0.001) and larger infants (mean 3723 g vs 3480 g, P = 0.024). In the logistic regression, occiput-posterior position, nulliparity, abnormal second stage cardiotocograph and epidural analgesia were independent predictors for operative delivery.
Conclusions:
Occiput-posterior position early in the second stage of labour is strongly associated with operative delivery. There is potential to explore interventions such as manual rotation.
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