Botulinum Toxin-A Dosing Trends for Adductor Spasmodic Dysphonia at a Single Institution Over 10 Years

Academic Article


  • Objectives This study aimed to identify the changes in dosing of botulinum toxin-A for adductor spasmodic dysphonia (ADSD) over a prolonged period. Study Design This is a retrospective chart review. Methods One hundred thirteen subjects treated for ADSD from 2003 to 2013 were identified from a clinical database. Subject age, gender, and total injection dose amount were all recorded for all subjects who had at least 10 injections. Results Fifty-four subjects met criteria for inclusion. There were no age or gender differences in the starting dose for subjects. Dosing decreased significantly compared with the second dose (5.05 ± 1.623 Units), by the sixth dose (4.26 ± 1.698 Units), and continued through the 10th dose (4.08 ± 2.019 Units) (P < 0.005 for all). Conclusions Botulinum toxin-A dosing for ADSD decreases consistently over subsequent injections after the initial two dose titrations.
  • Authors

    Published In

  • Journal of Voice  Journal
  • Digital Object Identifier (doi)

    Author List

  • Bradley JP; Barrow EM; Hapner ER; Klein AM; Johns MM
  • Start Page

  • 363
  • End Page

  • 365
  • Volume

  • 31
  • Issue

  • 3