| Abstract: | ![]()
Correlations among parameters indicating air usage during phonation were investigated in 60 normal subjects and 1,545 voice patients. The parameters examined were maximum phonation time (MPT), mean air flow rate for maximum sustained phonation (MFRm), mean air flow rate for comfortable phonation (MFRc), and phonation quotient (PQ). In normal subjects, correlations among MPT, MFRm, and PQ were high, but those between MFRc and the others were moderate. In cases of paralysis and hypofunctional dysphonia, all correlations between the four parameters were high. In the cases of polyp, nodule, epithelial hyperplasia, glottic carcinoma, and hyperfunctional dysphonia, the correlation between MPT and MFRc was moderate or not significant. The low correlation between these parameters was associated with the variations in flow rate differences between maximum and comfortable phonations. The results suggest that measurement of all four parameters is not necessary in routine tests and that MPT and MFRc should be measured in most voice patients. |
