Value of Urinary Brain-Derived Neurotrophic Factor Levels on the Assessment of Botulinum Toxin Type A Treatment for Neurogenic Detrusor Overactivity in Children with Myelodysplasia.

[PURPOSE] Urinary cytokines are proposed to predict urodynamic findings and outcome of intradetrusor botulinum neurotoxin type A injection in children with myelodysplasia. The relationship between urinary brain-derived neurotrophic factor and neurogenic and nonneurogenic detrusor overactivity has been shown as well. We prospectively investigated the effect of intradetrusor botulinum neurotoxin type A injection on urine brain-derived neurotrophic factor levels in children with nonneurogenic detrusor overactivity due to myelodysplasia.

[MATERIALS AND METHODS] Urine samples of 23 children with nonneurogenic detrusor overactivity due to myelodysplasia were collected and analyzed before and 1 and 3 months after intradetrusor botulinum neurotoxin type A injection, and urodynamics were performed before and 6 weeks after injection. Brain-derived neurotrophic factor levels and urodynamic findings were analyzed and statistical comparisons were done.

[RESULTS] Mean ± SD age was 100.0 ± 34.5 months. Ratio of girls to boys was 2.8. Brain-derived neurotrophic factor levels significantly decreased (p <0.006), and maximum cystometric capacity and maximum detrusor pressure improved significantly following intradetrusor botulinum neurotoxin type A injection compared to preoperatively (p <0.001). No statistical correlations were determined between brain-derived neurotrophic factor levels and urodynamics. Of all analyses only bladder compliance 5 ml/cm H2O or less vs greater than 5 ml/cm H2O at postoperative urodynamics was associated with statistically increased urine brain-derived neurotrophic factor levels, suggesting that increased urine brain-derived neurotrophic factor predicts treatment failure.

[CONCLUSIONS] The present study does not suggest that urine brain-derived neurotrophic factor is a reliable followup marker in children with nonneurogenic detrusor overactivity due to myelodysplasia. However, this factor may have a role in treatment planning, which needs to be established in future large prospective studies.