P Blanc-Petitjean1, C Le Ray2, F Lepleux3, A De La Calle4, M Dreyfus5, A A Chantry6. 1. Inserm UMR 1153, Obstetrical, Perinatal and Pediatric Epidemiology Research Team (EPOPé), centre for epidemiology and statistics Sorbonne Paris Cité (CRESS), DHU Risks in pregnancy, Paris-Descartes university, 75014 Paris, France; Department of obstetrics and gynecology, hôpital Louis Mourier, DHU Risks in pregnancy, Paris-Descartes university, 92700 Colombes, France. Electronic address: pauline.blanc-petitjean@inserm.fr. 2. Inserm UMR 1153, Obstetrical, Perinatal and Pediatric Epidemiology Research Team (EPOPé), centre for epidemiology and statistics Sorbonne Paris Cité (CRESS), DHU Risks in pregnancy, Paris-Descartes university, 75014 Paris, France; Port-Royal maternity unit, hôpital Cochin, Assistance Publique-Hôpitaux de Paris, DHU Risks in pregnancy, Paris-Descartes university, 75014 Paris, France. 3. Department of obstetrics, gynecology and reproductive medicine, CHU de Caen, 14000 Caen, France. 4. Port-Royal maternity unit, hôpital Cochin, Assistance Publique-Hôpitaux de Paris, DHU Risks in pregnancy, Paris-Descartes university, 75014 Paris, France. 5. Department of obstetrics, gynecology and reproductive medicine, CHU de Caen, 14000 Caen, France; University of Caen (Normandy), medical school, 14000 Caen, France. 6. Inserm UMR 1153, Obstetrical, Perinatal and Pediatric Epidemiology Research Team (EPOPé), centre for epidemiology and statistics Sorbonne Paris Cité (CRESS), DHU Risks in pregnancy, Paris-Descartes university, 75014 Paris, France; Midwifery school of Baudelocque, Assistance Publique-Hôpitaux de Paris, DHU Risks in pregnancy, Paris-Descartes university, 75014 Paris, France.
Abstract
INTRODUCTION:Fetal occiput posterior (OP) positions account for 15 to 20% of cephalic presentations and are associated with poorer maternal and neonatal outcomes than occiput anterior (OA) positions. The aim of this study was to identify maternal, neonatal and obstetric factors associated with rotation from OP to OA position during the first stage of labor. MATERIAL AND METHODS: This secondary analysis of a multicenter randomized controlled trial (EVADELA) included 285 laboring women with ruptured membranes and a term fetus in OP position. After excluding women with cesarean deliveries before full dilatation, we compared two groups according to fetal head position at the end of the first stage of labor: those with and without rotation from OP to OA position. Factors associated with rotation were assessed with univariate and multivariate analyses using multilevel logistic regression models. RESULTS: The rate of anterior rotation during the first stage was 49.1%. Rotation of the fetal head was negatively associated with excessive gestational weight gain (adjusted odds ratio [aOR]: 0.37, 95% confidence interval [CI]: 0.17-0.80), macrosomia (aOR: 0.35, 95% CI: 0.14-0.90), direct OP position (aOR: 0.24, 95% CI: 0.09-0.65), and prelabor rupture of membranes (aOR: 0.40, 95% CI: 0.19-0.86). Oxytocin administration was the only factor positively associated with fetal head rotation (aOR: 2.17, 95% CI: 1.20-3.91). DISCUSSION: Oxytocin administration may affect rotation of OP positions during the first stage of labor. Further studies should be performed to assess the risks and benefits of its utilization for managing labor with a fetus in OP position.
RCT Entities:
INTRODUCTION: Fetal occiput posterior (OP) positions account for 15 to 20% of cephalic presentations and are associated with poorer maternal and neonatal outcomes than occiput anterior (OA) positions. The aim of this study was to identify maternal, neonatal and obstetric factors associated with rotation from OP to OA position during the first stage of labor. MATERIAL AND METHODS: This secondary analysis of a multicenter randomized controlled trial (EVADELA) included 285 laboring women with ruptured membranes and a term fetus in OP position. After excluding women with cesarean deliveries before full dilatation, we compared two groups according to fetal head position at the end of the first stage of labor: those with and without rotation from OP to OA position. Factors associated with rotation were assessed with univariate and multivariate analyses using multilevel logistic regression models. RESULTS: The rate of anterior rotation during the first stage was 49.1%. Rotation of the fetal head was negatively associated with excessive gestational weight gain (adjusted odds ratio [aOR]: 0.37, 95% confidence interval [CI]: 0.17-0.80), macrosomia (aOR: 0.35, 95% CI: 0.14-0.90), direct OP position (aOR: 0.24, 95% CI: 0.09-0.65), and prelabor rupture of membranes (aOR: 0.40, 95% CI: 0.19-0.86). Oxytocin administration was the only factor positively associated with fetal head rotation (aOR: 2.17, 95% CI: 1.20-3.91). DISCUSSION: Oxytocin administration may affect rotation of OP positions during the first stage of labor. Further studies should be performed to assess the risks and benefits of its utilization for managing labor with a fetus in OP position.