Establishment of methods for evaluating impaired laryngeal closure during throat clearing using high-speed digital imaging and electroglottography

2016 Fiscal Year Final Research Report

• Project/Area Number: 26462604
• Research Category: Grant-in-Aid for Scientific Research (C)
• Allocation Type: Multi-year Fund
• Section: 一般
• Research Field: Otorhinolaryngology
• Research Institution: Osaka University
• Principal Investigator: Ogawa Makoto 大阪大学, 医学系研究科, 准教授 (80403179)
• Research Collaborator: IWAHASHI Toshihiko ; KATO Chieri
• Project Period (FY): 2014-04-01 – 2017-03-31
• Keywords: 咳払い / 発声 / 呼吸機能 / 誤嚥 / 高速度画像 / 電気声門図 / ハミング / 声帯傷害

Outline of Final Research Achievements

The laryngeal high-speed movies during throat clearing (TC) and sustained vowel phonation were analyzed for the angle between the bilateral vocal folds and the angular velocity of the vocal fold adduction. The results showed that the angular velocity accelerated continuously during TC followed by a sudden decrease to zero, whereas the angular velocity once accelerated, and decelerated to zero during vowel phonation. Furthermore, we found that the maximum frequency of the fluctuation of electrographic (EGG) signals observed during the expiratory phase of TC was demonstrated to be moderately correlated with the value of peak expiratory air flow in the whole group consisting of normal subjects and patients with unilateral vocal fold paralysis (UVFP), and that the correlation became stronger in the male-healthy and -UVFP subgroups. These results may allow the development of a new device for real-time monitoring of the cough efficiency during vocal and swallowing rehabilitation.

Free Research Field

発声・咳払い・嚥下時の喉頭閉鎖調節について