Abstract
Two botulinum toxins A have been evaluated for the treatment of refractory neurogenic detrusor overactivity (NDO) in humans: Dysport (abobotulinumtoxinA) and Botox (onabotulinumtoxinA). However, these two distinct commercialized products have different potency units and are not interchangeable. Assessment of the dose response and determination of minimal effective dose (MED) for Dysport and Botox in spinal cord-injured (SCI) rats with NDO. Female, adult, Sprague-Dawley rats (n=98) underwent T8-T9 spinal cord transection. Nineteen days after spinal cord injury, rats received intradetrusor injections (25μl injected, eight sites) of vehicle (V); Dysport 2, 5, 7.5, 10, and 12.5 U; and Botox 0.8, 2, 5, 7.5, and 10 U. Two days after injection, continuous cystometry was performed in conscious rats. Voiding contractions (VC) were assessed by duration of VC, intercontraction interval, voided volume, maximal pressure, pressure threshold change, and intravesical baseline pressure (BP), while nonvoiding contractions (NVC) were evaluated by amplitude, frequency, and volume threshold to elicit NVC. MEDs for Dysport and Botox were determined by analysis of variance step-down trend test. MEDs for Dysport and Botox were 10 U and 7.5 U, respecti...Continue Reading
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