Is There Any Correlation between Aerodynamic and Vocal Cord Vibration Parameters

Objectives:Investigate the correlation between vocal cord vibration parameters and aerodynamic parameters.Methods:We examined 13 patients with various voice disorders. Using the phonatory function analyzer PS77E, we measured sound pressure level (SPL), mean flow rate (MFR), expiratory lung pressure (EP), and airway resistance (EP/MFR). We used a high-speed video (HSV) system to observe the vocal cord vibration. We obtained the image data at a speed of 2000 frames/sec, while each subject was vocalizing the vowel sound /a/. We analyzed the predetermined area using Kay Image Processing Software (KIPS) with regard to the following: 1) maximum or minimum area, maximum or minimum opening at the midpoint of the glottis from a montage with glottal area waveform (GAW) analysis, and 2) maximum or minimum opening of the glottis, dominant amplitude or frequency of the opening variation of the vocal fold, and ratio of time of glottal total closure to the entire time domain in the calculation using kymograph edge analy...