The treatment of essential voice tremor with botulinum toxin A: A longitudinal case report |
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Authors: | Paul Warrick Christopher Dromey Jonathan Irish Lisa Durkin |
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Affiliation: | Department of Otolaryngology, Toronto General Hospital, University of Toronto, Ontario, Canada. |
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Abstract: | The purpose of this study was to evaluate the effects of bilateral botulinum toxin injection into the thyroarytenoid (TA) muscles of a patient with essential voice tremor. Acoustic and aerodynamic data were collected weekly over a 16-week period. Flexible nasolaryngoscopy was performed prior to injection and 2, 6, 10, and 16 weeks postinjection. Perceptual analyses of the acoustic and nasolaryngoscopic data were performed. A reduction in frequency tremor and, to a lesser extent, amplitude tremor was observed during the 1-10 week period. Estimated laryngeal resistance decreased after injection and was accompanied in perceptual measures by a reduction in vocal effort, laryngeal tremor, and supraglottic hyperfunction. Essential voice tremor can be successfully attenuated with bilateral percutaneous injection of botulinum toxin A into the vocalis muscle. |
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Keywords: | Essential voice tremor Botulinum toxin A |
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