Perinatal outcomes: intravenous patient-controlled fentanyl versus no analgesia in labor.

Aim To investigate perinatal outcomes, the analgesic efficacy and maternal satisfaction in nulliparous women receiving fentanyl intravenous patient-controlled analgesia (i.v.-PCA). Material and Methods A total of 1401 nulliparous women with a singleton pregnancy who received fentanyl i.v.-PCA (i.v.-PCA group, n=290) or no analgesia (control group, n=1111) in labor between 2005 and 2010 were reviewed. Fentanyl i.v.-PCA was implemented on maternal request during the first stage of labor over 35 weeks of gestation, and discontinued at full cervical dilatation. Perinatal outcomes were compared between the i.v.-PCA and the control groups. The numerical rating scale (NRS) levels during labor were also examined in the i.v.-PCA group. Additionally, parturients received fentanyl i.v.-PCA in 2010 (n=73) were asked about overall satisfaction using a scale poor, moderate, good and excellent on postpartum day 03. Results Women receiving i.v.-PCA showed significantly longer labor and more need of oxytocin augmentation, compared with the control. Cesarean section was significantly less frequent in the i.v.-PCA group compared with the control (11.0% v.s. 24.1%, respectively), with the vacuum-assisted delivery rate comparable between groups. Neonatal outcomes (i.e. Apgar score <7 at 1min or 5min, umbilical artery pH <7.20) were comparable between groups, irrespective of mode of delivery. Significant reduction of NRS levels was noted until 3h after induction of i.v.-PCA, compared to the baseline. Of the women who expressed their satisfaction, 72% (48/67) exhibited excellent' or good' for pain relief by i.v.-PCA. Conclusion Fentanyl i.v.-PCA could be a useful approach for labor pain relief in nulliparas when regional blocks are unavailable.