Challenges and practical considerations in delivering botulinum neurotoxin to adults with congenital neurogenic lower urinary tract dysfunction with history of genitourinary reconstruction

Abstract

Purpose:While intradetrusor botulinum neurotoxin (BoNT) injection is a well-established treatment of neurogenic detrusor overactivity, its administration in individuals with complex genitourinary (GU) reconstruction can be difficult. The objective of this report is to highlight our institution’s experience with challenges and practical solutions in delivering BoNT to this unique patient population. Materials and Methods:We performed a retrospective review of our institution’s database of adults with congenital neurogenic lower urinary tract dysfunction (NLUTD) with history of complex GU reconstruction who received intradetrusor BoNT injections performed by a single surgeon between 2016 and 2023. In patients with multiple injections, the most recent procedure was used as the index case for analysis. Results:A total of 17 patients were included, with a mean age of 27 years (range 21–46). The most common diagnosis was myelomeningocele (n=13), followed by sacral agenesis (n=2), Williams syndrome (n=1), and urethral atresia (n=1). The most common GU reconstruction was augmentation cystoplasty (n=11). 75% (12/16) of the patients had a continent catheterizable channel (CCC) and 31% (5/16) had undergone prior bladder neck reconstruction or closure. Conclusion:Additional considerations and instruments are required for safe and effective BoNT injections in individuals with congenital NLUTD and reconstruction. Adequate preparation by the staff and the provider may be needed. Our recommendation generally favors the utilization of a flexible cystoscope or a rigid scope with a smaller sheath size to minimize trauma to the CCC, bladder neck, or urethra. Additionally, it is advisable to consider reconstituting BoNT in higher concentrations to enable the administration of fewer injections. Furthermore, performing these procedures in the operating room under anesthesia allows for the development of a well-considered strategy prior to any attempts in the office setting We hope that this manuscript sparks discussion between pediatric urologists and adult urologist to expand our knowledge on strategies needed for delivering BoNT to individuals with complex and restricting GU surgeries.