LEVEL OF EVIDENCE: III
In 2006, labor induction was utilized in 22.5% of U.S. births.1 Despite this high rate, and despite the fact that among nulliparas, laborinduction is associated with a doubling of the cesarean rate even after controlling for maternal demographic characteristics, medical risk, and pregnancy complications,2 there is no commonly accepted definition of “failed labor induction.” Specifically, neither of the two major obstetric textbooks currently in use in the United States,3,4 nor the American College of Obstetricians and Gynecologists (ACOG) practice bulletin5 on labor induction includes an explicit definition, although the latter acknowledges that “allowing at least 12–18 hours of latent labor before diagnosing a failed induction may reduce the risk of cesarean delivery.”
Previously, in a single-center prospective study, the utility of a definition of failed labor induction was evaluated.6 By protocol, the administration of oxytocin for 12 hours after membrane rupture with no progress into the active phase of labor was required before induction could be deemed to have failed. This requirement allowed parturients who remained in the latent phase for up to 12 hours to achieve vaginal deliveries that they otherwise would not have. The utility of this approach was subsequently confirmed in a retrospective study, also single-centered, in which the majority of women with latent-phase durations of up to 18 hours were delivered vaginally.7 In both of these studies, longer latent phases were not associated with an increased risk of adverse neonatal outcome.
In the present investigation, we took advantage of data collected as part of a multi-centered fetal pulse oximetry trial8 to evaluate the associated benefits and risks of progressively longer latent-phase durations among nulliparas undergoing labor induction at or beyond 36 weeks of gestation.
LEVEL OF EVIDENCE: IIIIn 2006, labor induction was utilized in 22.5% of U.S. births.1 Despite this high rate, and despite the fact that among nulliparas, laborinduction is associated with a doubling of the cesarean rate even after controlling for maternal demographic characteristics, medical risk, and pregnancy complications,2 there is no commonly accepted definition of “failed labor induction.” Specifically, neither of the two major obstetric textbooks currently in use in the United States,3,4 nor the American College of Obstetricians and Gynecologists (ACOG) practice bulletin5 on labor induction includes an explicit definition, although the latter acknowledges that “allowing at least 12–18 hours of latent labor before diagnosing a failed induction may reduce the risk of cesarean delivery.”Previously, in a single-center prospective study, the utility of a definition of failed labor induction was evaluated.6 By protocol, the administration of oxytocin for 12 hours after membrane rupture with no progress into the active phase of labor was required before induction could be deemed to have failed. This requirement allowed parturients who remained in the latent phase for up to 12 hours to achieve vaginal deliveries that they otherwise would not have. The utility of this approach was subsequently confirmed in a retrospective study, also single-centered, in which the majority of women with latent-phase durations of up to 18 hours were delivered vaginally.7 In both of these studies, longer latent phases were not associated with an increased risk of adverse neonatal outcome.In the present investigation, we took advantage of data collected as part of a multi-centered fetal pulse oximetry trial8 to evaluate the associated benefits and risks of progressively longer latent-phase durations among nulliparas undergoing labor induction at or beyond 36 weeks of gestation.
การแปล กรุณารอสักครู่..