KMID : 1004320190300010028
|
|
Journal of the Korean Society of Logopedics and Phoniatrics 2019 Volume.30 No. 1 p.28 ~ p.33
|
|
Quantitative Measurement of Laryngeal Electromyography Using Motor Unit Action Potential in Unilateral Vocal Cord Paralysis
|
|
Ha Ryun
Kim Dong-Young Kim Dong-Hyun Woo Joo-Hyun
|
|
Abstract
|
|
|
Background and Objectives: Laryngeal electromyography (LEMG) is valuable to evaluate the innervation status of the laryngeal muscles and the prognosis of vocal fold paralysis (VFP). However, there is a lack of agreement on quantitative interpretation of LEMG. The aim of this study is to measure the motor unit action potentials (MUAP) quantitatively in order to find cut-off values of amplitude, duration, phase for unilateral vocal fold paralysis patients.
Materials and Method: Retrospective chart review was performed for the unilateral VFP patients who underwent LEMG from March 2016 to May 2018. Patient¡¯s demography, cause of VFP, vocal cord mobility, and LEMG finding were analyzed. The difference between normal and paralyzed vocal folds and cut-off values of duration, amplitude, and phase in MUAP were evaluated.
Results: Thirty-six patients were enrolled in this study. Paralyzed vocal fold had significantly longer duration (p=0.021), lower amplitude (p=0.000), and smaller phase (p=0.012) than the normal. The cut-off values of duration, amplitude, and phase in MUAP for unilateral VFP were 5.15 ms, 68.35 ¥ìV, and 1.85 respectively.
Conclusion: An analysis of MUAP successfully provided quantitative differences between normal and paralyzed vocal folds. But, additional research is needed to get more available cut-off value which is helpful to evaluate the status of laryngeal innervations.
|
|
KEYWORD
|
|
Electromyography, Motor unit action potential, Vocal fold paralysis
|
|
FullTexts / Linksout information
|
|
|
|
Listed journal information
|
|
|
|