Comparison of Efficacy of Vaginal Misoprostol versus a Synthetic Osmotic Dilator (Dilapan-S) for Cervical Preparation before Operative Hysteroscopy: A Randomized Controlled Study.

Objectives: To compare the need for mechanical cervical dilatation following vaginal misoprostol or synthetic osmotic dilator (Dilapan-S) usage for cervical preparation before operative hysteroscopy.

Materials and methods: Fifty-five premenopausal women scheduled for operative hysteroscopic procedures with a 26 Fr resectoscope were included in this randomized, controlled clinical trial. After randomization, either 400 μg of vaginal misoprostol or intracervical synthetic osmotic dilator (Dilapan-S) was inserted 12 h before operative hysteroscopy. The need for additional mechanical cervical dilatation before insertion of the resectoscope was compared between the two groups. Initial cervical diameter before mechanical dilatation, intraoperative complications (cervical tears, creation of a false passage), and ease of dilatation were also compared between the two groups.

Results: In the misoprostol group, 92% of women required additional mechanical cervical dilatation, whereas only 36% of women in the Dilapan-S group required additional dilatation (P < 0.05). The median initial cervical diameter achieved with Dilapan was 9 mm (Q1: 7 mm; Q3: 10 mm), and with misoprostol, it was 6 mm (Q1: 4.5 mm; Q3: 8 mm) (P < 0.05). There was no significant difference in other outcome parameters between the two groups.

Conclusion: Synthetic osmotic dilator (Dilapan-S) is more efficacious than vaginal misoprostol at ripening the cervix before operative hysteroscopy.