Botulinum Toxin Applications in the Larynx

The primary function of the larynx is protection of the lower respiratory system and, in addition, it facilitates respiration and phonation. Hypertonicity and/or spasm of the laryngeal muscles due to several reasons can cause abnormalities in respiration, digestion and voice. Botulinum toxin has been used successfully in the treatment of adductor spasmodic dysphonia (laryngeal dystonia) for several years. Cricopharyngeal dysphagia, laryngeal tics, laryngeal granulomas and paradoxical vocal cord motions are the other areas, where botulinum toxin can be used. Because of its reversible effects, botulinum toxin is superior to the destructive surgical techniques. In this article, the anatomy and physiology of the larynx is described briefly and botulinum toxin applications in the larynx are discussed. (Archives of Neuropsychiatry 2010; 47 Supplement: 30-4