Vaginal birth after caesarean section (VBAC) in women with spontaneous labour: predictors of success

We evaluated the predictors of VBAC success in Jordanian women with a single previous low transverse caesarean section of a gestational age of at least 28 weeks, followed by a trial of spontaneous labour at two tertiary hospitals between January 2008 and February 2010. Among 207 women, 117 (57%) women achieved a successful VBAC. Multivariate analysis showed that a cervical dilatation of ≥ 7 cm at the time of previous caesarean section was an independent predictor of successful VBAC (with a success rate of 80%). Parity of ≥ 2 was significantly associated with increased odds of success (OR = 2.7, 95% CI: 1.2, 6.2). Compared with women who had no previous VBAC, those with previous VBAC had higher odds of success (OR = 3.8 (95% CI: 1.5, 9.5). We concluded that women with a previous caesarean section who achieved a cervical dilatation of ≥ 7 cm before caesarean, had a previous history of successful VBAC and had parity of ≥ 2, have the greatest likelihood of successful VBAC.