Abstract
BackgroundThe 90% effective dose (ED90) of oxytocin infusion has been previously estimated to be 16.2 IU h− 1. However, bolus administration of oxytocin prior to the infusion may decrease the infusion dose required. The aim of this study was to estimate the ED95 for oxytocin infusion after a bolus at elective caesarean delivery (CD) in nonlaboring parturients.MethodsWe performed a randomized, triple blinded study in 150 healthy termparturients scheduled for elective CD under epidural anaesthesia. After delivery of the infant and i.v. administration of 1 IU oxytocin as a bolus, Participants were randomized to receive oxytocin infusion at a rate of 0, 1, 2, 3, 5, or 8 IU h− 1, to be given for a total of 1 h. Uterine tone assessed by the blinded obstetrician as either adequate or inadequate. Secondary outcomes included estimated blood loss (EBL), requirement for supplemental uterotonic agents, and development of side effects.ResultsThe 95% effective dose (ED95) of oxytocin infusion was estimated to be 7.72 IU h− 1 (95% confidence interval 5.80–12.67 IU h− 1). With increasing oxytocin infusion rate, the proportion of parturients who needed rescue oxytocin bolus or secondary uterotonic agents decreased. No significant among-group differences in the EBL and oxytocin-related side effects were observed.ConclusionsIn parturients who receive a 1 IU bolus of oxytocin during elective cesarean delivery, an infusion rate of oxytocin at 7.72 IU h− 1 will produce adequate uterine tone in 95% of parturients. These results suggest that the total dose of oxytocin administered in the postpartum period can be decreased when administered as an infusion after oxytocin bolus.
Highlights
The 90% effective dose (ED90) of oxytocin infusion has been previously estimated to be 16.2 IU h− 1
In parturients who receive a 1 IU bolus of oxytocin during elective cesarean delivery, an infusion rate of oxytocin at 7.72 IU h− 1 will produce adequate uterine tone in 95% of parturients. These results suggest that the total dose of oxytocin administered in the postpartum period can be decreased when administered as an infusion after oxytocin bolus
The dose-response curve was plotted (Fig. 3) from which we estimated the ED50 to be 0.05 IU h− 1 (95% confidence interval [CI] -2.51 to 1.25 IU h− 1) and the ED95 to be 7.72 IU h− 1
Summary
The 90% effective dose (ED90) of oxytocin infusion has been previously estimated to be 16.2 IU h− 1. The aim of this study was to estimate the ED95 for oxytocin infusion after a bolus at elective caesarean delivery (CD) in nonlaboring parturients. When administered as an infusion, Lavoie et al estimated the ED90 of oxytocin during elective CD in nonlaboring women to be 16.2 IU h− 1 [5]. While this approach is effective, it exposes patients to significant amounts of oxytocin in the postpartum period. The aim of this study was to estimate the ED95 (the minimum effective dose (ED) of oxytocin bolus to result in adequate tone in 95% of parturients) for oxytocin infusion after a bolus at elective CD in nonlaboring parturients. Our hypothesis was that the ED95 of the infusion would be lower than in previous studies that did not administer a bolus prior to the infusion
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