role of videokimography in evaluation of vocal fold vibrations in functional dysphonia

ABSTRACT

15 patients with different types of functional dysphonia were examined using the newly developed videokymographic system. This high speed imaging technique produces a time history representing successive glottal cycles within one image, which allows direct observation of vocal fold motion. All patients underwent indirect laryngo-videostroboscopic examination, which revealed mild stroboscopic deviations in only 2 patients. Videokymographic examination revealed variable vibratory pattern deviations in all of the patients, in the form of asymmetry in phase, asymmetry in amplitude, phase differences between the right and left vocal folds and aperiodicity. This study concluded that videokymography is a powerful tool which enables the precise evaluation of vocal fold vibration patterns in functional dysphonia patients, providing a more accurate diagnosis of this voice entity, while it is not costly or time consuming