Respiration and Phonation

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Abstract
Ninety patients with different laryngeal diseases were subjected to phonatory and respiratory function studies. These studies included simultaneous registration of air flow rate, air volume and voice during sustained phonation, and splrometric investigations. Three physiologic criteria are recommended to establish an objective evaluation of laryngeal function under clinical conditions-the mean flow rate, the phonation time ratio, and the ratio between phonation volume and vital capacity. The physiologic significance of these 3 criteria are discussed, and the resulting data are related to the major factors of glottal resistance and subglottic power in the production of voice. The studies confirm the clinical importance of objective and quantitative measures of laryngeal function.

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