Akihito Yamauchi1, Hisayuki Yokonishi2, Hiroshi Imagawa3, Ken-Ichi Sakakibara4, Takaharu Nito3, Niro Tayama5. 1. The Department of Otolaryngology, The University of Tokyo Hospital, 3-7-1, Hongo, Bunkyo-Ku, Tokyo 113-8655, Japan. Electronic address: drachilles23@yahoo.co.jp. 2. The Department of Otolaryngology, The Tokyo Metropolitan Police Hospital, 4-22-1, Nakano, Nakano-Ku, Tokyo 164-8541, Japan. 3. The Department of Otolaryngology, The University of Tokyo Hospital, 3-7-1, Hongo, Bunkyo-Ku, Tokyo 113-8655, Japan. 4. The Department of Communication Disorders, The Health Sciences University of Hokkaido, 1757, Ataribetsucho-Kanazawa, Ishikari-Gun, Hokkaido 061-0293, Japan. 5. The Department of Otolaryngology and Tracheo-esophagology, The National Center for Global Health and Medicine, 1-21-1, Toyama, Shinjuku-Ku, Tokyo 162-8655, Japan.
Abstract
INTRODUCTION: The goal of this work was to objectively elucidate the vibratory characteristics of vocal fold paralysis (VFP) using high-speed digital imaging (HSDI). METHODS: HSDI was performed in 29 vocally healthy subjects (12 women and 17 men) and in 107 patients with VFP (40 women and 67 men). Then, the HSDI data were evaluated by visual-perceptual rating, single-line kymography, multiline kymography, laryngotopography, and glottal area waveform analysis. RESULTS: Patients with VFP compared with vocally healthy subjects revealed more frequent incomplete glottal closure, greater asymmetry in amplitude, mucosal wave, frequency, and phase, as well as larger open quotient, smaller speed index, larger maximal and minimal glottal area, and smaller glottal area difference. Paralyzed vocal folds in VFP revealed reduced mucosal wave than nonparalyzed vocal folds in VFP or in intact vocal folds in vocally healthy subjects. CONCLUSIONS: HSDI was effective in documenting the characteristics of vocal fold vibrations in patients with VFP and in exploring the vibratory disturbance for estimating the severity of dysphonia. Copyright Â
INTRODUCTION: The goal of this work was to objectively elucidate the vibratory characteristics of vocal fold paralysis (VFP) using high-speed digital imaging (HSDI). METHODS: HSDI was performed in 29 vocally healthy subjects (12 women and 17 men) and in 107 patients with VFP (40 women and 67 men). Then, the HSDI data were evaluated by visual-perceptual rating, single-line kymography, multiline kymography, laryngotopography, and glottal area waveform analysis. RESULTS:Patients with VFP compared with vocally healthy subjects revealed more frequent incomplete glottal closure, greater asymmetry in amplitude, mucosal wave, frequency, and phase, as well as larger open quotient, smaller speed index, larger maximal and minimal glottal area, and smaller glottal area difference. Paralyzed vocal folds in VFP revealed reduced mucosal wave than nonparalyzed vocal folds in VFP or in intact vocal folds in vocally healthy subjects. CONCLUSIONS: HSDI was effective in documenting the characteristics of vocal fold vibrations in patients with VFP and in exploring the vibratory disturbance for estimating the severity of dysphonia. Copyright Â
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