The treatment of essential voice tremor with botulinum toxin A: A longitudinal case report

The purpose of this study was to evaluate the effects of bilateral botulinu m toxin injection into the thyroarytenoid (TA) muscles of a patient with es sential voice tremor. Acoustic and aerodynamic data were collected weekly o ver a 16-week period. Flexible nasolaryngoscopy was performed prior to inje ction and 2, 6, 10, and 16 weeks postinjection. Perceptual analyses of the acoustic and nasolaryngoscopic data were performed. A reduction in frequenc y 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 ca n be successfully attenuated with bilateral percutaneous injection of botul inum toxin A into the vocalis muscle.