Predictive urodynamic factors for de novo stress urinary incontinence after laparoscopic sacrocolpopexy for pelvic organ prolapse

Objectives Laparoscopic sacrocolpopexy is often performed to treat pelvic organ prolapse. Preoperative stress urinary incontinence (SUI) can improve after laparoscopic sacrocolpopexy. In contrast, some patients without incontinence preoperatively develop SUI after pelvic organ prolapse repair (ie, de novo SUI). This study aimed to identify the preoperative predictive factors of de novo SUI after laparoscopic sacrocolpopexy. Methods A total of 858 patients underwent laparoscopic sacrocolpopexy between January 2013 and November 2017 at Kameda Medical Center. Urodynamic studies were performed pre- and postoperatively on 75 patients. This retrospective study included 43 of 75 patients who did not have SUI preoperatively. We assessed urethral function according to functional profile length and maximum urethral closure pressure. We evaluated voiding function in terms of maximum flow rate, detrusor pressure at maximum flow rate, and postvoid residual volume. Furthermore, each factor was compared between de novo SUI-positive and SUI-negative groups. Results After laparoscopic sacrocolpopexy, 30 (69.8%) patients presented with SUI. The preoperative maximum urethral closure pressure was significantly lower in the de novo SUI-positive group (36.0 cmH(2)O) than in the de novo SUI-negative group (50.5 cmH(2)O, P = .020). More patients with maximum urethral closure pressure <40 cmH(2)O had de novo SUI than patients with maximum urethral closure pressure >= 40 cmH(2)O (P = .004). There were no significant differences between preoperative maximum urethral closure pressure and postoperative maximum urethral closure pressure in either group. Conclusions Low preoperative maximum urethral closure pressure, particularly maximum urethral closure pressure <40 cmH(2)O, is a predictor of de novo SUI after laparoscopic sacrocolpopexy.