Different Routes of Misoprostol for Same-Day Cervical Priming Prior to Operative Hysteroscopy: A Randomized Blinded Trial

Abstract Study Objective To compare the effectiveness of and patient satisfaction with different routes of misoprostol administration for short-term cervical priming before operative hysteroscopy. Design Randomized blinded trial (Canadian Task Force classification I). Setting University hospital. Patients One hundred and twenty patients undergoing operative hysteroscopy. Interventions Patients were randomly assigned to receive 400 μg of misoprostol administered orally (n = 40), vaginally (n = 40), or sublingually (n = 40) for cervical priming at 1.5 to 4 hours before undergoing operative hysteroscopy. Measurements and Main Results The primary outcome was preoperative cervical dilatation. Secondary outcomes included cervical consistency, ease of dilation and time of dilation, patient discomfort, and side effects. No differences were noted among the 3 groups in terms of patient age, parity, previous vaginal delivery, menopausal status, and time interval from preparation to procedure. Patients in the 3 groups reported similar discomfort and side effects. Initial mean cervical dilatation was 6.1 ± 2.0 mm in the oral group, 6.4 ± 2.1 in the vaginal group, and 6.4 ± 1.8 mm in the sublingual group (p = .75). Cervical consistency and ease of dilation were similar among the groups. The mean time of dilation was 37.2 ± 30.6 seconds in the oral group, 31.7 ± 29.0 seconds in the vaginal group, and 31.5 ± 21.7 seconds in the sublingual group (p = .59). Additional subanalyses according to menopausal status and parity did not demonstrate any differences among the groups. Conclusion Same-day cervical priming for operative hysteroscopy is achieved equally with all routes of misoprostol administration, with similar patient satisfaction and side effects.