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Transoral Electromyographic Recordings in Botulinum Toxin—Injected Rat Larynges

1997; SAGE Publishing; Volume: 106; Issue: 11 Linguagem: Inglês

10.1177/000348949710601112

1943-572X

Katsuhide Inagi, Charles N. Ford, Arthur A. Rodriquez, Dennis M. Heisey,

Salivary Gland Tumors Diagnosis and Treatment

Objective assessment of muscle function following botulinum toxin injections in laryngeal muscles is difficult in human subjects. We developed a rat laryngeal model for the study of botulinum toxin injection. A new laryngoscopic technique has made it possible to observe the rat larynx endoscopically and to obtain electromyographic measurements during and after injection of toxin. The electromyographic interference pattern, fibrillation potentials, and vocal fold movement were used for analyzing dose and volume effects of injected toxin. We conclude that the lowest dosage able to produce the maximal duration of functional laryngeal impairment is 0.07 U in a volume of 0.4 μL. This model will enable us to obtain physiologic and histologic parameters that can be used to assess the selection of optimal treatment regimens with botulinum toxin for the treatment of patients with spasmodic dysphonia.