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Cervical balloon catheters are effective for inducing labor, but the benefits of single-balloon versus double-balloon catheters are unconfirmed. Investigators randomized 293 pregnant women who were admitted for labor induction to undergo insertion of single-balloon (group 1) or double-balloon (group 2) catheters. Single-balloon 24-French Foley catheters were filled with 60-mL saline and tension was applied; double-balloon catheters (a balloon on either side of the cervical os) were filled with 80-mL saline in each balloon without tension. Catheter removal was planned for 12 hours after insertion if spontaneous expulsion had not already occurred. The primary outcome was duration from catheter insertion to delivery.
Spontaneous expulsion occur…