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The incidence and outcomes of urodynamic stress urinary incontinence in female patients with urethral diverticulum.

AIMS: To assess the incidence and management of urodynamic stress urinary incontinence (USUI) in women undergoing transvaginal excision of a urethral diverticulum (UD) at our institution.

METHODS: A prospective database, capturing patients undergoing urethral diverticulectomy over a 9-year period (May 2007 to August 2016), was reviewed focusing on USUI and subsequent management.

RESULTS: One hundred patients underwent UD excision (with modified Martius labial fat-pad flap interposition). Preoperative magnetic resonance imaging data, available in 90 patients, demonstrated that 80% had complex diverticula. Complete urodynamic data were available for 93 patients. Preoperatively, 27 patients (29%) had USUI of which 16 patients resolved with either UD excision alone (n = 8) or 3 months of pelvic floor muscle therapy (PFMT) (n = 8). All 11 with persistent postoperative USUI had video urodynamics (VUDs) confirming Blaivas type 3 USUI. Six patients had a rectus fascial pubovaginal sling (RFPVS) with success in five (83.3%) while five had a mid-urethral obturator tape (MUT-O) with 100% success. Sixteen patients developed de novo stress urinary incontinence (SUI) postoperatively, with resolution after PFMT in 12 (75%). VUDS identified USUI (Blaivas type 3) in two (of the remaining four) patients, managed successfully with MUT-O (n = 1) and RFPVS (n = 1).

CONCLUSION: Preoperative USUI is present in 29% with UD. Postoperatively, 35.5% (n = 33) have pre-existing (19) or de novo (14) SUI, of which 60.6% (n = 20) resolves after 12 months of conservative management. Surgery for USUI is required in 13 (13.9%), with cure in 92.3%. This supports our practice to excise UD primarily and delay USUI surgery, therefore, avoiding overtreatment for the majority.

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