[Effects of persistent occiput posterior presentation on mode of delivery].

In this study of 2437 deliveries, 119 (4.9%) took place in the occiput posterior position (OP). Only 33.9% of these did not require any operative intervention, versus 82% in the occiput anterior group (OA). The total duration of labor and the duration of the second stage were significantly longer in the OP group. The Apgar scores of the newborns at 1 minute and 5 minutes were significantly lower in the OP group. Episiotomies and perineal tears were more frequent in the OP group, but the difference was not significant.