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Purpose: Male slings have emerged as a popular and efficacious treatment for men with post-prostatectomy stress urinary incontinence. Traditionally slings have been used with caution or avoided in men with impaired detrusor contractility or Valsalva voiding because of concern that patients will not be able to overcome the fixed resistance of a sling during micturition. We propose that men with post-prostatectomy urinary incontinence who have impaired contractility and/or void with abdominal straining for urodynamics can be safely treated with slings. Materials and Methods: A retrospective review of patients with post-prostatectomy urinary incontinence who underwent an initial sling procedure between January 2004 and January 2010 was conducted at a single institution. Preoperative urodynamic characteristics, and postoperative Patient Global Impression of Improvement, post-void residual and noninvasive uroflow data were examined. Patients were grouped by poor bladder contractility or Valsalva voiding status. Exclusion criteria were lack of preoperative urodynamics and/or postoperative post-void residual. A total of 92 patients were analyzed. The variables were compared using the Student t test and the chi-square test. Results: No statistically significant difference was shown in postoperative post-void residual (mean 4 months postoperatively) or urinary retention when comparing by bladder contractility or Valsalva voiding. In the subset of patients with available postoperative uroflow data, there were no differences in postoperative maximum flow rate or voided volume. Conclusions: Men with post-prostatectomy urinary incontinence with urodynamic findings suggesting impaired contractility or Valsalva voiding can be safely treated with sling surgery if they have normal preoperative emptying. [Copyright &y& Elsevier]