Journal of the Korean Society of Laryngology, Phoniatrics and Logopedics (대한후두음성언어의학회지)

The Korean Society of Laryngology, Phoniatrics and Logopedics. (대한후두음성언어의학회)
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Quantitative Measurement of Laryngeal Electromyography Using Motor Unit Action Potential in Unilateral Vocal Cord Paralysis

일측성 성대 마비에서 운동단위 활동전위를 이용한 정량적 후두 근전도 분석

  • Ha, Ryun (Department of Otorhinolaryngology Head and Neck Surgery, School of Medicine, Gachon University, Gil Medical Center) ;
  • Kim, Dong Young (Department of Otorhinolaryngology Head and Neck Surgery, School of Medicine, Gachon University, Gil Medical Center) ;
  • Kim, Dong Hyun (Department of Otorhinolaryngology Head and Neck Surgery, School of Medicine, Gachon University, Gil Medical Center) ;
  • Woo, Joo Hyun (Department of Otorhinolaryngology Head and Neck Surgery, School of Medicine, Gachon University, Gil Medical Center)
  • 하륜 (가천대학교 의과대학 길병원 이비인후과학교실) ;
  • 김동영 (가천대학교 의과대학 길병원 이비인후과학교실) ;
  • 김동현 (가천대학교 의과대학 길병원 이비인후과학교실) ;
  • 우주현 (가천대학교 의과대학 길병원 이비인후과학교실)
  • Received : 2019.05.17
  • Accepted : 2019.06.04
  • Published : 2019.06.30
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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, $68.35{\mu}V$, 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.

Keywords

References

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