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KMID : 0361019950380050732
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Korean Journal of Otolaryngology - Head and Neck Surgery
1995 Volume.38 No. 5 p.732 ~ p.738
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A Clinical Study of an Objective Assessment of Laryngeal Function Using the phonatory Function Analyzer: Measuring the Air Flow Rate During the Phonation of /pa/
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Abstract
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Evaluation of aerodynamic conditions within the glottis is very important to the study of physiology and patho9logy of voice production. Among the diagnostic modalities currently available, measuring the mean air flow rate (MAFR) is the most
widely
used
method. However, measuring MAFR is not a quite objective method due to its dependency on the sound intensity during the pronounciation of vowels. In order to obtain a more objective air flow rate, in this study the phonation of /pa/ using the
phonatory
function analyzer was performed three times each to twenty-five patients with voice disorders and twenty-five control groups. And the ratio of maximum air flow rate between /a/ and /p/ (AC/DC ratio) was calculated and analyzed for each group. The
results showed that there were differences of AC/DC ratio between groups of voice disorders and control, and between groups of vocal polyp and vocal cord palsy.
In conclusion, AC/DC ratio obtained during the phonation of /pa/ using the phonatory function analyzer can be useful in differentiating the abnormal phonation among the patients with hoarseness as well as in predicting the treatment result of the
postoperative voice disorder patients by comparing the preoperative and the postopertive AC/DC ratio. (Korean J Otolaryngol 38:5, 1995)
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