Photoelectric measurement of laryngeal paralyses correlated with videostroboscopy

Abstract

Photoglottography and electroglottography are relatively noninvasive techniques that provide detailed information about vocal fold vibration. However, few significant clinical applications have been made by correlating photoelectric waveforms to specific pathologic changes in laryngeal vibration. Videostroboscopy has recently been used to document vibratory patterns of laryngeal paralyses in a canine model of phonation. A study of PGG and EGG waveforms correlated with videostroboscopy in an in-vivo canine model of phonation with simulated unilateral recurrent or superior laryngeal nerve paralysis is presented. The shift quotient--a new glottographic parameter which identifies flaccid laryngeal paralyses--is presented.

Videostrobokymography: A New Method for the Quantitative Analysis of Vocal Fold Vibration

“…Many techniques have been developed to study the vibration of the vocal folds, such as stroboscopy, high‐speed photography, electroglottography, photoglottography, and videokymography 1‐3,6,8 …”

“…When the pressure exceeds the resistance of the vocal folds, mucosal waves propagate from the anterior to posterior, as well as inferior to superior, margins of the vocal folds. Because the mucosal vibration is the final determinant of the quality of voice, various tools have been developed to evaluate the vibratory movement of the vocal folds 1‐3 …”

Electroglottographic measurements of glottal function in vocal fold paralysis in women

“…It can thus supplement the data obtained from other techniques with information important for physicians and voice therapists. Electroglottography has been used to examine the function of the glottis since the 1960s 1–4 . Electroglottography was first described by Fabre in 1959.…”

“…First, it required individual adjustment of the settings for each patient and second, slight displacements of electrodes could cause variability in results. In the early years of electroglottography there were difficulties in interpreting recordings and ascribing waveform abnormalities to particular pathological conditions of the vocal folds 4 . In recent years, electroglottography has been used to assess the function of the larynx, both in examining its physiology and various abnormalities 1,2, 4,6–8 …”

Electroglottography in Elderly Patients with Vocal-Fold Palsy

“…4 EGG technique was first described by Fabre in 1959 and has since been used to supplement the data obtained from other techniques with information about vocal-fold contact, important for physicians and voice therapists. [4][5][6][7] The modern EGG system, called ''laryngograph,'' eliminates the necessity of individual adjustment of the settings for each patient and makes the results independent of electrode displacements during the examination. [8][9][10][11] The purpose of the current study was to determine:…”