Dynamic Changes of the Genital Hiatus at the Time of Prolapse Surgery: 1-Year Follow-Up Study.

Importance: The genital hiatus (GH) has been identified as a predictor of pelvic organ prolapse. An enlarged preoperative GH is a risk factor for recurrent prolapse after surgery.

Objective: The objective of this study was to determine the changes in preoperative and postoperative GH size compared with the intraoperative resting GH at 6 weeks and 12 months after native-tissue pelvic organ prolapse surgery.

Study Design: This was a descriptive analysis of a prospective cohort study of women undergoing native-tissue prolapse repair with apical suspension. Resting GH was obtained at the start and conclusion of surgery. Measurements were obtained preoperatively, and 6 weeks and 12 months postoperatively under Valsalva maneuver. Comparisons were made using paired t tests for the following time points: (1) preoperative measurements under Valsalva maneuver to resting presurgery measurements under anesthesia, and (2) resting postsurgery measurements under anesthesia to 6 weeks and 12 months postoperatively under Valsalva maneuver.

Results: Sixty-seven patients were included, with a median age of 66 years and median body mass index (calculated as weight in kilograms divided by height in meters squared) of 29.1. There was no significant difference in GH when measured preoperatively to resting presurgical measurements under anesthesia ( P = 0.60). For all, the median GH was 3.0 cm at the conclusion of surgery and remained at 3.0 cm at 6 weeks and 12 months postoperatively. In patients who had a concurrent posterior colporrhaphy, the median resting postsurgery GH was 3.0 cm, then decreased to 2.5 cm at 6 weeks then 3.5 cm at 12 months under Valsalva.

Conclusions: Preoperative GH size under Valsalva maneuver and resting under anesthesia were comparable. For all patients undergoing native-tissue pelvic organ prolapse repair, the genital hiatus size remains the same from the intraoperative final resting measurements to the 6-week and 12-month measurements under Valsalva maneuver.