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Predictors of successful vaginal birth after cesarean without an epidural among women with no prior vaginal delivery.

BACKGROUND
Data are scarce on predictors for success of labor after cesarean (LAC) among women delivering without epidural anesthesia (EA). We aimed to study the predictors for success of LAC among women with no prior vaginal delivery that did not use EA.


METHODS
A retrospective study including all women undergoing LAC between 3/2011 and 1/2021 with no prior vaginal delivery that did not use EA. Factors associated with successful vaginal birth after cesarean were examined using multivariable analysis.


RESULTS
Of the 466 no EA LAC, 339 (72.7%) delivered vaginally. Women in the successful LAC group had lower pregestational and predelivery BMI as compared to those who had a repeat cesarean [odds ratio (OR) 95% confidence interval (CI) 0.90 (0.85-0.94), P < 0.001, and 0.89 (0.85-0.93), P < 0.001, respectively]. The rate of labor dystocia in previous cesarean was lower in the LAC success group [92 (27.1%) vs 50 (39.4%), OR 95% CI 0.57 (0.37-0.88)]. Mean gestational age at LAC was lower in the LAC success group (385/7  ± 25/7 vs 395/7  ± 15/7 , P = 0.014). In a multivariable logistic regression analysis, the following factors were negatively and independently associated with LAC success: higher predelivery BMI [adjusted odds ratio (aOR) 95% CI 0.90 (0.86-0.95)], higher gestational age at previous cesarean and at LAC [aOR 95% CI 0.81 (0.70-0.93) and 0.97 (0.94-0.98), respectively], induction of labor [aOR 95% CI 0.08 (0.03-0.25)], and duration of ruptured membranes [aOR 95% CI 0.97 (0.96-0.99)].


CONCLUSIONS
We have identified that lower BMI, lower gestational age, shorter ruptured membranes duration, and spontaneous labor are associated with successful LAC among nonusers of EA with no prior vaginal delivery at one tertiary care facility in Israel.