Acoustical evaluation of Issiki type III thyroplasty in a patient with mutational voice disorder

Abstract

We performed an Issiki type III thyroplasty on a patient with mutational voice disorder and evaluated the acoustical differences between the pre and post-surgical voice. The results were that the fundamental frequency (Fo), shimmer parameter (SP), and normalized noise energy b (NNEb) decreased after the operation. Since this procedure was effective not only for lowering vocal pitch, but also for improving hoarseness, it might be a good choice for treatment of patients with mutational voice disorders, especially those with laryngeal noise.