Multiple intravesical instillation of low‐dose resiniferatoxin is effective in the treatment of detrusor overactivity refractory to anticholinergics

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Abstract
OBJECTIVE: To examine the effectiveness and tolerability of multiple intravesical instillations of 10 nmol/L resiniferatoxin in patients with detrusor overactivity (DO) refractory to anticholinergic agents, as not all these patients are successfully treated by one such instillation.PATIENTS AND METHODS: The study included 53 patients with DO from neurogenic (NDO, 10), previous bladder outlet obstruction (BOO, 20) or idiopathic cause (IDO, 23) and who were refractory to anticholinergic agents. Patients received three to four instillations of 10 nmol/L resiniferatoxin, as outpatients. The International Prostate Symptom Score and quality‐of‐life index were recorded, and a video‐urodynamic study conducted at baseline and 3 months after treatment. The therapeutic results and urodynamic variables were compared among patients with different causes of DO.RESULTS: Four patients withdrew from the study after the first instillation because of urinary tract infection or severe pain on urination, leaving 49 who completed at least three instillations. The overall results were an excellent response in 17 patients (35%), improvement in 13 (27%) and failure in 19 (39%); the treatment was deemed a success (excellent or improved) in 16 of 20 with previous BOO, 11 of 19 with IDO, and only three of 10 with NDO (P = 0.011). Patients had significant improvements in the storage symptom score, total symptom score and quality‐of‐life index after treatment. The cystometric capacity and the postvoid residual were significantly greater and voiding efficiency significantly less after treatment. DO during the urodynamic study was absent in 12 patients after treatment.CONCLUSIONS: Multiple intravesical instillations of 10 nmol/L resiniferatoxin are effective in treating patients with DO refractory to anticholinergics.

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