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Latent Labor With an Unknown Uterine Scar

Obstetrics & Gynecology: September 1996
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Objective To determine if avoiding the augmentation of ineffective contractions in women with unknown uterine scars would decrease the risk of cesarean for protraction disorders, compared with awaiting the onset of spontaneous labor.

Methods Term gravidas with one or two unknown uterine scars in early labor were randomized to nonintervention (N = 101) and intervention (N = 96) groups. Nonintervention subjects were discharged if cervical change did not occur within 4 hours. Intervention subjects were admitted. Contractions that persisted for 4 hours without cervical change were augmented with oxytocin.

Results Intervention subjects received oxytocin significantly more often (82 versus 55%, P < .001) and had a statistically significantly higher rate of uterine scar separation (5 versus 0%, P = .03). There was no difference between the two groups in length of active labor (4.0 versus 4.25 hours) or incidence of cesarean delivery (16 versus 17%).

Conclusion The augmentation of ineffective contractions during latent labor in gravidas with an unknown uterine scar does not increase the rate of cesarean delivery, but it is significantly more likely to result in uterine scar separations.

Reprints are not available.

© 1996 The American College of Obstetricians and Gynecologists

Augmentation of nonprogressive latent labor in women with unknown uterine scars does not increase the cesarean rate but does increase the rate of scar separation.