Balloon ripening appears reasonable after cesarean

Balloon-based induction after prior cesarean was not linked to higher complete uterine rupture than spontaneous labor or oxytocin.
*Systematic review/meta-analysis of cohort studies; Level 2 (OCEBM).

Citation

Balayla J, Engo A, Dahdouh EM. Transcervical Balloon Cervical Ripening and Risk of Uterine Rupture After Previous Cesarean Delivery: A Systematic Review and Meta-analysis. American Journal of Obstetrics and Gynecology. 2026. doi:10.1016/j.ajog.2026.09.037

Background

Inducing labor after a previous cesarean can increase the rare but serious risk of uterine rupture. Prostaglandins are generally avoided in this setting; mechanical balloon ripening may be a safer option, but prior evidence was fragmented.

Patients

Women attempting labor after a prior low-transverse cesarean, generally at term with singleton head-down pregnancies. Exclusions included classical or T-shaped scars, second-trimester induction, nonseparable balloon exposure, and unclear rupture outcomes.

Intervention

Foley, single-balloon, or double-balloon cervical ripening, usually followed by breaking the water, oxytocin, or both.

Control

Spontaneous labor, oxytocin-based induction, prostaglandin ripening, or elective repeat cesarean.

Outcome

Complete uterine rupture, uterine dehiscence, and selected maternal and newborn outcomes.

Follow-up Period

During labor and delivery.

Results

Twenty studies included 28,035 study observations and 5,516 balloon exposures. Primary complete-rupture analyses used observational cohorts.

Outcome Comparison Significant finding Absolute effect
Complete uterine rupture (primary) Balloon vs prostaglandins Odds ratio 0.43 (95% confidence interval 0.26 to 0.72) 19 fewer per 1,000; number needed to treat 53
Uterine dehiscence (secondary, exploratory) Balloon vs mixed comparators Odds ratio 1.86 (95% confidence interval 1.06 to 3.29) 10 more per 1,000; number needed to harm about 100

Versus oxytocin alone or spontaneous labor, balloon ripening showed no statistically detectable difference in complete rupture. Evidence certainty was very low throughout. The prostaglandin result was driven mainly by one large registry.

Limitations

Most evidence was observational, with likely differences in patient risk, cervix readiness, prior vaginal birth, and hospital practice. Balloon use was rarely isolated from later oxytocin or water-breaking, so results apply to a balloon-based strategy, not the catheter alone. Uterine rupture was rare, making estimates imprecise.

Funding

None declared; no reported conflicts.

Clinical Application

When induction is indicated after prior low-transverse cesarean, consider balloon ripening over prostaglandins, with counseling, monitoring, and immediate surgical readiness.