嚥下音の産生部位と音響特性の検討 : 健常成人を対象として  [in Japanese] Evaluation of the Sites Where Swallowing Sound Produces and the Acoustic Characteristic of Swallowing Sound in Healthy Adults  [in Japanese]

Access this Article

Search this Article

Author(s)

    • 中山 裕司 NAKAYAMA Hiroshi
    • 昭和大学歯学部顎口腔疾患制御外科学教室 Department of Oral and Maxillofacial Surgery, Showa University School of Dentistry
    • 高橋 浩二 TAKAHASHI Koji
    • 昭和大学歯学部口腔リハビリテーション科 Department of Oral Rehabilitation, Showa University School of Dentistry
    • 宇山 理紗 UYAMA Risa
    • 昭和大学歯学部口腔リハビリテーション科 Department of Oral Rehabilitation, Showa University School of Dentistry
    • 平野 薫 HIRANO Kaoru
    • 昭和大学歯学部口腔リハビリテーション科 Department of Oral Rehabilitation, Showa University School of Dentistry
    • 深澤 美樹 FUKASAWA Miki
    • 昭和大学歯学部顎口腔疾患制御外科学教室 Department of Oral and Maxillofacial Surgery, Showa University School of Dentistry
    • 南雲 正男 NAGUMO Masao
    • 昭和大学歯学部顎口腔疾患制御外科学教室 Department of Oral and Maxillofacial Surgery, Showa University School of Dentistry

Abstract

音響特性による嚥下障害診断の重要な手掛かりとなる嚥下音について, その産生部位や部位に対応した音響特性は明らかとされていない.そこで嚥下音の産生部位と音響特性を明らかにする目的で, 画像・音響分析プログラムを新たに構築し, 健常者を対象として嚥下音産生時の造影画像と嚥下音音響信号データの同期解析を行った.対象は健常成人12名で, 各被験者8嚥下ずっ計96嚥下にっいて食塊通過時間の測定, 食塊通過音の識別と出現頻度の解析, および最大ピーク周波数の評価を行った.食塊通過時間は喉頭蓋通過時間 (121.7±92.4msec), 舌根部通過時間 (184.8±70.6msec), 食道入口部通過時間 (342.9±61.1msec) の順で長くなり, 舌根部通過音, 喉頭蓋通過音, 食道入口部通過開始音, 食道入口部通過途中音および食道入口部通過終了音が識別された.このうち喉頭蓋通過音が最も出現頻度が高く (96嚥下中94嚥下), 嚥下ごとの通過音の出現状況では舌根部通過音, 喉頭蓋通過音, 食道入口部通過開始音, 食道入口部通過途中音の4音が出現するパターンが96嚥下中22嚥下 (22.9%) と最も多くみられた.また最大ピーク周波数の平均値の比較では食道入口部通過開始音 (370.7±222.2Hz) が最も高く, 続いて食道入口部通過途中音 (349.1±205.4Hz), 舌根部通過音 (341.2±191.3Hz), 喉頭蓋通過音 (258.6±208.2Hz), 食道入口部通過終了音 (231.2±149.8Hz) の順であった.本研究により嚥下音の産生部位と産生喜附に対応した音響特性が明らかとなった.

Site where the swallowing sound is produced and acoustic characteristics of the swallowing sound in each site are unknown, although the swallowing sound is an important clue to diagnose acoustically dysphagia. Synchronized analyses of swallowing sound signals and VF images of swallowing events were done using new sound-image analyzing system to verify sites where the swallowing sounds are produced and acoustic characteristics of the swallowing sound in each site. Twelve healthy volunteers served as subjects. Ninety six swallows (8 swallows per each subject) were analyzed to measure bolus passing time, to identify bolus passing sound, to confirm the frequency of appeared passing sound, and to assess the maximum peak frequency.<BR>Epiglottis passing time (121.7±92.4 msec) was the shortest, tongue base passing time (184.8±70.6 msec) was second, and upper esophageal sphincter (UES) passing time (342.9±61.1 msec) was the longest. Tongue base passing sound, epiglottis passing sound, initial UES passing sound, middle UES passing sound and final UES passing sound were identified. Frequency of epiglottis passing sound was the highest (94/96). Patterns of the appearance of passing sounds in each swallow were investigated. The appearance of four passing sounds (base of tongue passing sound, epiglottis passing sound, initial UES passing sound, and middle UES passing sound) in a swallow was the most dominant (22/96).<BR>In assessing the averaged maximum peak frequency, initial UES passing sound (370.7±222.2 Hz) was the highest, middle UES passing sound (349.1±205.4 Hz) was second, tongue base passing sound (341.2±191.3 Hz) was third, v epiglottis passing sound (258.6 ± 208.2 Hz) forth, final UES passing sound (231.2±149.8 Hz) was fifth respectively. This study revealed site where the swallowing sound is produced and acoustic characteristics of the swallowing sound in each site.

Journal

  • The Journal of Showa University Dental Society

    The Journal of Showa University Dental Society 26(2), 163-174, 2006-06-30

    Showa University Dental Society

References:  23

Cited by:  1

Codes

Page Top