title: Cervical dilatation at the time of cesarean section may affect the success of a subsequent vaginal delivery.
abstract: OBJECTIVE
  To evaluate the effect of labor progress prior to cesarean delivery on the outcome of vaginal birth after cesarean delivery (VBAC).
  
  
  METHODS
  The medical records of women attempting VBAC between January 2000 and February 2008 were reviewed. All women had only one previous cesarean and underwent spontaneous labor.
  
  
  RESULTS
  Among 1148 enrolled women, 956 (83.3%) achieved a successful VBAC. Birth weight, previous indication for cesarean delivery and oxytocin augmentation were significantly associated with VBAC outcome. By multivariate analysis, a cervical dilatation >or=8 cm at previous cesarean was independently predictive of successful VBAC in women with a previous cesarean for non-recurrent indications (p = 0.046), yielding a VBAC success rate of 93.1%, whereas the extent of cervical dilatation at the previous cesarean did not affect the outcome of subsequent delivery in women with a previous cesarean for recurrent indications.
  
  
  CONCLUSIONS
  Women with cesarean for non-recurrent indications who achieved a cervical dilatation >or=8 cm may be the best candidates for VBAC, with the greatest likelihood of a successful VBAC. Labor progress at previous cesarean can serve as a valuable indicator for VBAC outcome in women with a previous cesarean for non-recurrent indications, and therefore should be discussed as part of preconception counseling.
authors.affiliation: Department of Obstetrics and Gynecology, College of Medicine, The Catholic University of Korea, Seoul, Korea.
authors.forename: Ji Young
authors.initials: JY
authors.lastname: Kwon
authors.forename: Yun Sung
authors.initials: YS
authors.lastname: Jo
authors.forename: Gui Se Ra
authors.initials: GS
authors.lastname: Lee
authors.forename: Sa Jin
authors.initials: SJ
authors.lastname: Kim
authors.forename: Jong Chul
authors.initials: JC
authors.lastname: Shin
authors.forename: Young
authors.initials: Y
authors.lastname: Lee
mesh_terms: D000328:Adult; D001724:Birth Weight; D002585:Cesarean Section; D005260:Female; D006801:Humans; D007231:Infant, Newborn; D007747:Labor Stage, First; D007751:Labor, Induced / Q000706:statistics & numerical data; D011247:Pregnancy; D014219:Trial of Labor; D016064:Vaginal Birth after Cesarean / Q000706:statistics & numerical data*