Abstract
(1) Background: Laryngeal electromyography (LEMG) plays a key role in classifying the severity of nerve damage and determining the prognosis of the nerve recovery. LEMG is primarily a qualitative study, without a standardized approach to interpretation. The development of qualitative and quantitative analysis would situate LEMG in the gold standard of modern neurolaryngologic diagnostics. The aim of this study was to quantitatively evaluate laryngeal electromyography recorded in patients with vocal fold immobility or dysmobility. (2) Methods: The electromyographic material comprised 84 thyroarytenoid muscles recordings of 42 patients. (3) Results: In our study, we observed significant differences between EMG characteristics of healthy and paralyzed VF. Our study showed that recording laryngeal muscle activity during successive phases of breathing provides additional valuable information. We noticed that the frequency and amplitude of motor unit potentials correlates with the return of vocal fold functionality. (4) Conclusions: Laryngeal EMG guides the clinician on the best course of treatment for the patient. It is therefore important to develop an effective methodology and consensus on the quantitative interpretation of the record. Amplitude and frequency parameters are valuable in predicting neural recovery and in the return of vocal fold mobility.
Highlights
Laryngeal electromyography (LEMG) plays a key role in classifying the severity of nerve damage and determining the prognosis of the nerve recovery [1]
The material of the present study showed that iatrogenic causes are still the most common cause of vocal fold paralysis
Laryngeal electromyography is a unique test among EMG
Summary
Laryngeal electromyography (LEMG) plays a key role in classifying the severity of nerve damage and determining the prognosis of the nerve recovery [1]. In studies of the larynx, near normal voluntary motor unit potentials and recruitment without spontaneous activity, according to the Seddon classification, are indicative of neuropraxia, which may have a good prognosis. The absence of voluntary motor units and spontaneous activities, such as fibrillation potentials, reflects axonotmesis or neurotmesis, which indicates a poor prognosis for laryngeal recovery [5]. Seddon’s characterization principles may not fully correspond to the larynx, due to the low number and size of fibers per motor unit (MU) within the laryngeal muscles [2,6]. UFcoerpsaervamereatlryiceeavrsa,luleaatidoinngofoLtoElMarGyn. Tgohleodgeicvaellorepsmeaerncth ouf nqiutsalhitaavteivbeeaenndwqouraknintigtattoivinetarnodaluycseispwaroaumldetsriitcueavtealtuhaetiLoEnMofGLiEnMthGe. gTohleddsetavneldoaprmd eonft moof dqeuranlintaetuivroelaanrydnqguoalongtiictadtiivaegnaonsatliycss.is would situate the LEMG in the gold standard of modTehrne aniemuroofltahriysnsgtuoldoygiwc adsiatognqousatnictsit.atively evaluate laryngeal electromyography rec-.
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