Intravesical Botulinum Toxin for Overactive Bladder Syndrome without Detrusor Overactivity

Abstract

Objective:

To report our experience of intravesical botulinum toxin for idiopathic overactive bladder syndrome (OAB) without detrusor overactivity (DOA) on urodynamic assessment.

Patients and methods:

Data regarding presentation, diagnosis, urodynamic findings, date and dose of treatment, and outcomes were recorded prospectively for 94 patients undergoing intravesical botulinum toxin injection for idiopathic overactive bladder syndrome at our institution. The cohort included 19 patients without DOA on urodynamics. A positive response to treatment was defined as patient-reported improvement without the need for further treatment. ICIQ-OAB and UI scores, and bladder diary parameters were also recorded. Rates of urinary retention requiring intermittent or indwelling catheterisation were noted.

Results:

The overall response rate to treatment was 82% (n = 94). Patients without DOA (n = 19) had a response rate of 89%, which compared favourably with a response rate of 81% in patients with DOA (n = 75). Overall, 29% of patients who were voiding normally prior to treatment required intermittent self-catheterisation after the procedure. The requirement for self-catheterisation did not appear to be influenced by urodynamic findings.

Conclusion:

These preliminary, non-randomised data suggest that intravesical botulinum toxin injection may be efficacious in patients with OAB symptoms without DOA. Further evaluation by means of a randomised, controlled trial is suggested.