喉頭
Online ISSN : 2185-4696
Print ISSN : 0915-6127
ISSN-L : 0915-6127
原著
外転型痙攣性発声障害の治療経験:甲状軟骨形成術Ⅲ型を行った2症例と長期経過
三枝 英人門園 修前田 恭世田邉 愛弓伊藤 裕之山口 智小町 太郎中村 毅愛野 威一郎熊田 政信
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ジャーナル フリー

2018 年 30 巻 1 号 p. 4-12

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Abductor spasmodic dysphonia (AbSD) is characterized by voice breaks, an involuntary breathy voice quality and difficulty coordinating respiration with phonation. The phenomenon is caused by the involuntary abduction of the bilateral vocal folds with inadequate and excessive activity of the bilateral posterior cricoarytenoid muscle (PCA). We herein report 2 patients (a 29- and 39-year-old woman) with AbSD whose condition was improved surgically by hemilateral thyroplasty type III (shortening of the thyroid lamina and rendering the vocal folds relaxed). The effects of the surgery on their voice quality were conserved for a long time (2 years in the 29-year-old and 5.5 years in the 39-year-old). Shortening the vocal fold through this surgery might suppress the excessive sensitivity of the muscle spindles of the PCA, thereby enabling control of the abnormal abductor movement of the vocal folds during speech.

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