Results:The basal characteristics were similar between the 2 groups. Bishop score evaluated by the attending physician blinded to the procedure followed had a significantly higher value in the ultrasonographic group (5 versus 3 p = 0.001) and lower was the requirement of prostaglandin as a second ripening tool (20% versus 43% p = 0.01). No differences were evidenced in the other variables tested. Conclusions: Ultrasound-guided CRB placement induces a better ripening of the cervix resulting in a reduced requirement of using a secondary method of IOL.

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