Criteria for failed labor induction: prospective evaluation of a standardized protocol

Of 509 women treated, 25% of nulliparas and 9% of parous women underwent cesarean delivery.

• After 6 hours of oxytocin and ruptured membranes, 14% of nulliparas remained in the latent phase, with a vaginal delivery rate of 39%.
• At 9 hours, 7% of nulliparas remained in the latent phase, resulting in a vaginal delivery rate of 28%.
• Only 4% of nulliparas were still in the latent phase after 12 hours, with a vaginal delivery rate of 13%.
• Among parous women, only 3% remained in the latent phase after 6 hours, and none stayed in that phase for 12 hours, all delivering vaginally.
• No serious complications were reported, and severe neonatal morbidities were infrequent and unrelated to the duration of the latent phase.

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