Impact of Obstructive Sleep Apnea Syndrome on Time to Complete Recovery of Continence After Robot-Assisted Radical Prostatectomy: A Propensity Score Matching Analysis.

Postoperative urinary incontinence after robot-assisted radical prostatectomy (RARP) represents a bothersome side effect, which may permanently affect patient's quality of life. Several studies have demonstrated that obstructive sleep apnea syndrome (OSAS) is associated with urinary symptoms such as urge incontinence, overactive bladder, and nocturia. In this study, we sought to further explore the effect of OSAS on urinary continence after RARP. We queried our prospectively collected institutional RARP database and identified 82 patients with OSAS and 131 controls, which were matched for age and body mass index (BMI), with available follow-up data for continence. To minimize selection bias, we conducted a propensity score-matched analysis. Patient's characteristics and urinary continence outcomes were compared between the two groups before and after propensity-score matching. Kaplan-Meier curves were constructed to assess the difference in continence between the two groups. Results are presented as means with standard deviations and percentages with 95% confidence intervals (CIs). A total of 213 patients were included in the analysis, of whom 82 with OSAS and 131 with non-OSAS (control group). The mean age of the total cohort was 61.7 ± 6.96 years, the mean BMI was 30.4 ± 5.36, and 52% of the cohort were classified as obese (BMI ≥30). In post-propensity score-matched analyses, there was no significant difference in baseline demographics and tumor characteristics between the two groups (included 82 cases in each group). The median time to continence was 6.6 months for the control group as compared with 13.0 months for the OSAS group ( < 0.001). At 12 months the continence rate for the OSAS group was 41.2% (95% CI: 28.9%-51.4%) as compared with 61.7% (95% CI: 28.5%-71.5%) for the control group. At 24 months the continence rate for the OSAS group was 68.7% (95% CI: 56%-77.7%) as compared with 90.8% (95% CI: 79%-96%) for the control group. On matched analysis, we found that patients with OSAS tended to demonstrate worse urinary continence recovery as compared with patients without OSAS. Additional investigation will be necessary to confirm these initial findings.