病的声帯における喉頭調節に関する研究 : 生犬を用いた基礎的検討

概要

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Phonodynamic studies were carried out on live canine larynges with normal or pathological vocal folds. Experimental phonation was achieved by air flow blown through a cut-end of the trachea. Prior to the experiment, bilateral vocal folds were sutured at the cartilaginous portion. In addition, bilateral recurrent laryngeal nerves were prepared for stimulation to drive the thyroarytenoid muscles after severance of the PCA branches.Experimental data obtained were as follows; 1) subglottic pressure, 2) sound intensity, 3) air flow rate, 4) fundamental frequency, and 5) vibratory pattern photographed by an ultra high-speed camera.From results obtained, we concluded as follows; bilateral stimulation of the RLNs resulted in increase in intensity of the sound and subglottic pressure ane decrease in fundamental frequency of the sound. In addition, a better glottic closure with quasi-regular vibratory pattern was obtained by bilateral RLNs stimulation. These facts indicated that better vocal efficiency was obtained.These results were discussed mainly from the view point of phonodynamics and their implication for phonosurgery.
社団法人日本耳鼻咽喉科学会の論文