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KMID : 0921420090140020212
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Korean Journal of Communication Disorders
2009 Volume.14 No. 2 p.212 ~ p.222
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Breathing Characteristics of Adults with Unilateral Vocal Fold Palsy
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Choi Yae-Lin
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Abstract
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Background & Objectives: Patients with unilateral vocal fold palsy (UVFP) suffer from incomplete glottal closure and irregular vocal fold vibration, which interrupts the airflow needed for efficient voice production. This study investigated adult patients with UVFP, compared them to adult controls, and evaluated the differences between the two groups in the characteristics of glottal area waveform and phonation, as well as the relationship between glottal area waveform and respiratory and vocal function.
Methods: Twenty control subjects and 20 adults with UVFP were studied. Respiratory and aerodynamic analysis and glottal area waveform (GAW) studies were performed.
Results: There were no significant differences in respiratory function between the two groups. Subjects with UVFP had significantly shorter maximum phonation times (MPT) and fewer syllables per breath in a reading passage task than did control subjects. The frequency of inspiration, subglottic pressure (Psub), and mean airflow rate (MFR) were significantly higher in patients with UVFP than in control subjects. Multiple regression analysis was employed to examine the relationship between number of syllables per breath and four independent factors: MPT, Psub, MFR, and reading rate. Multiple regression analysis revealed that the number of syllables per breath was significantly influenced by MPT.
Discussion & Conclusion: The results suggest that MPT, number of syllables per breath, and frequency of inspiration may be useful parameters in evaluating respiratory function in patients with UVFP.
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KEYWORD
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unilateral vocal fold palsy, vital capacity, glottal area waveform, mean airflow rate, maximum phonation time (MPT), syllables per second, syllables per breath, frequency of inspiration
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