反回神経麻痺患者の発声機能:発声時声門面積が及ぼす影響

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This study reports the relationship between the glottal space during phonation and subjective and objective measurements of vocal function of fifty subjects with recurrent laryngeal nerve paralysis who were seen at the voice clinic at the University of Wisconsin. Three types of data were collected: 1) GRBAS values of perceptual voice judgments,2) vocal function examination values, and 3) glottal area to vocal cord length ratio. Measurements to determine the glottal area and vocal cord length were computed on a video image of the larynx. The glottal area was defined as the area at the onset of phonation enclosed by a line drawn from the right to the left vocal process and from the anterior commissure to the vocal process along the median side of each vocal cord. The distance between the vocal process and the anterior commissure at rest was defined as the vocal cord length. The glottal area to vocal cord length ratio was then computed. Results demonstrated relations between the glottal area to vocal cord length ratio and other examinations: in the subjects where the grade or breathiness in GRBAS values was high, the glottal area to vocal cord length ratio was high; there were negative relationships between this ratio and the sound pressure level, the maximum phonation time or the intensity range.
耳鼻咽喉科臨床学会の論文