Intradetrusor botox injection and augmentation cystoplasty trends among spina bifida patients at US freestanding children's hospitals.

INTRODUCTION: Intra-detrusor botulinum toxin (Botox) injection is a minimally invasive alternative to augmentation cystoplasty in patients with refractory neurogenic bladder. Botox was first used for neurogenic bladder children two decades ago. However, there are no existing guidelines on indications or use among patients with spina bifida. Furthermore, there are little data regarding its use relative to bladder augmentation and patient volume on a national scale.

OBJECTIVE: We sought to investigate the contemporary trends of intra-detrusor Botox injection and augment cystoplasty in free-standing children's hospitals.

STUDY DESIGN: We queried the Pediatric Health Information System database to identify spina bifida patients from 2016 to 2019 who underwent intra-detrusor Botox injection and augment cystoplasty based on CPT and ICD-10 codes. Total spina bifida population under care in the free-standing children's hospitals was estimated by all inpatient and ambulatory surgery encounters as denominators to calculate frequency by time for both intra-detrusor Botox injections and augmentation cystoplasty.

RESULTS: In total, we included 1924 intra-detrusor Botox injections and 842 augmentation cystoplasties. 1413 (51.1%) patients were female. Median age at surgery was 10.0 (interquartile range 6.98-13.5) years. There was a significant increase in intra-detrusor Botox injection frequency (p < 0.001). While there was an overall decreasing, but not significant, trend for augmentation cystoplasty, there was a significant increase in this procedure during the summer months compared to the rest of the year (p < 0.001, Figure 1). Sensitivity analysis using only first intra-detrusor Botox injection per patient demonstrated similarly significant increasing trend.

DISCUSSION: Use of intra-detrusor Botox injection for the management of neurogenic bladder has significantly increased among patients with spina bifida while augmentation cystoplasty has slightly decreased, but not significantly.

CONCLUSIONS: Over time, practice patterns for the treatments of neurogenic bladder among spina bifida children have favored minimally invasive Botox injections while augmentation cystoplasty use has not significantly changed.