title: Latent labor with an unknown uterine scar.
abstract: 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%).
  
  
  CONCLUSIONS
  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.
authors: Department of Obstetrics and Gynecology, University of Southern California, Los Angeles, USA.
authors: D K
authors: DK
authors: Grubb
authors: S L
authors: SL
authors: Kjos
authors: R H
authors: RH
authors: Paul
mesh_terms: D000328:Adult; D002585:Cesarean Section / Q000706:statistics & numerical data; D005260:Female; D005323:Fetal Monitoring; D006801:Humans; D007747:Labor Stage, First; D010120:Oxytocics; D010121:Oxytocin; D011247:Pregnancy; D012307:Risk Factors; D014219:Trial of Labor; D014597:Uterine Rupture / Q000453:epidemiology*; D016064:Vaginal Birth after Cesarean
chemical_list: D010120:Oxytocics; D010121:Oxytocin