OBJECTIVE: The purpose of this study was to determine whether an occiput posterior (OP) fetal head position increases the risk for anal sphincter injury when compared with an occiput anterior (OA) position in vacuum-assisted deliveries. STUDY DESIGN: We conducted a retrospective cohort study of 393 vacuum-assisted singleton vaginal deliveries. Maternal demographics and obstetric and neonatal data were collected from an obstetric database and chart review. RESULTS: Within the OP group, 41.7% developed a third- or fourth-degree laceration compared with 22.0% in the OA group (OR 2.5, 95% CI 1.4-4.7). In a logistic regression model that controlled for BMI, race, nulliparity, length of second stage, episiotomy, birth weight, head circumference, and fetal head position, OP position was 4.0 times (95% CI 1.7-9.6) more likely to be associated with an anal sphincter injury than OA position. CONCLUSION: Among vacuum deliveries, an OP head position confers an incrementally increased risk for anal sphincter injury over an OA position.
OBJECTIVE: The purpose of this study was to determine whether an occiput posterior (OP) fetal head position increases the risk for anal sphincter injury when compared with an occiput anterior (OA) position in vacuum-assisted deliveries. STUDY DESIGN: We conducted a retrospective cohort study of 393 vacuum-assisted singleton vaginal deliveries. Maternal demographics and obstetric and neonatal data were collected from an obstetric database and chart review. RESULTS: Within the OP group, 41.7% developed a third- or fourth-degree laceration compared with 22.0% in the OA group (OR 2.5, 95% CI 1.4-4.7). In a logistic regression model that controlled for BMI, race, nulliparity, length of second stage, episiotomy, birth weight, head circumference, and fetal head position, OP position was 4.0 times (95% CI 1.7-9.6) more likely to be associated with an anal sphincter injury than OA position. CONCLUSION: Among vacuum deliveries, an OP head position confers an incrementally increased risk for anal sphincter injury over an OA position.
Authors: Pai-Jong Stacy Tsai; Ian A Oyama; Mark Hiraoka; Steven Minaglia; Jennifer Thomas; Bliss Kaneshiro Journal: Female Pelvic Med Reconstr Surg Date: 2012 May-Jun Impact factor: 2.091
Authors: Marija Simic; Sven Cnattingius; Gunnar Petersson; Anna Sandström; Olof Stephansson Journal: BMC Pregnancy Childbirth Date: 2017-02-21 Impact factor: 3.007