Botulinum toxin (OnabotulinumtoxinA) in the male non-neurogenic overactive bladder: clinical and quality of life outcomes

Objective

To assess the efficacy of OnabotulinumtoxinA (BTXA) injections in men with drug-refractory non-neurogenic overactive bladder (NNOAB).

Patients and Methods

A total of 43 men received BTXA injections for NNOAB from 2004 to 2012. Patient Global Impression of Improvement (PGI-I) score was obtained. For men with wet NNOAB, change in number of pads per day was also assessed.

Results

Forty-three men with a mean age of 69 (range 37-85) received at least one injection. Of the 43 men, 20 (47%) had prior prostate surgery: 11 had radical prostatectomy (RP) and nine had transurethral resection of prostate (TURP). Overall, average PGI-I score was 2.7. Comparing PGI-I score in men who had prior prostate surgery with men who have not: 2.6 ± 0.5 vs 2.8 ± 0.5 respectively (average ± 95% CI), P = 0.6. Comparing PGI-I score in men who had previous TURP with men who had previous RP: PGI-I score: 3.3 ± 0.8 vs 2.0 ± 0.5 respectively, P < 0.05. Men who had RP experienced a reduction in pad use (from 3.5 ± 1.7 to 1.6 ± 0.9 pads/day, P < 0.05) while this was not the case amongst men who had TURP (from 1.7 ± 1.5 to 1.4 ± 1.5 pads/day, P = 0.4).

Conclusion

Overall, BTXA injection in men with drug-refractory NNOAB does provide a symptomatic benefit. Amongst men who have had prior prostate surgery, men who have had RP experience a greater benefit than men who have had TURP, both in regards to PGI-I score and pad use.