Laryngeal Electromyography: Are the Results Reproducible?

Crespo, Agrício Nubiato; Kimaid, Paulo André Teixeira; Júnior, Almiro José Machado; Wolf, Aline Epiphanio

doi:10.1016/j.jvoice.2014.09.009

Cited by 6 publications

(7 citation statements)

References 13 publications

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“…Laryngeal electromyography (LEMG) is an important diagnostic tool to confirm recurrent laryngeal nerve injury and predict recovery of vocal fold motion in patients with vocal fold paralysis (VFP). [1][2][3] Whereas laryngoscopy reveals vocal fold mobility deficits, LEMG confirms or refutes a neurogenic etiology. 4,5 LEMG findings can predict recovery of vocal fold motion with high degrees of accuracy using motor unit recruitment and morphology, spontaneous activity and intralaryngeal muscle synkinesis.…”

Section: Introductionmentioning

confidence: 93%

Vocal fold injection material does not preclude interpretation of laryngeal electromyography

et al. 2021

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Introduction/Aims: Temporary vocal fold injection (VFI) is a common treatment for acute and subacute vocal fold paralysis (VFP). Laryngeal electromyography (LEMG) is useful for diagnosing neurogenic causes of VFP. This study evaluated whether the presence of VFI material prevents interpretation of LEMG in patients with acute and subacute VFP.Methods: Patients with acute and subacute unilateral VFP (onset ≤6 mo) who underwent temporary VFI within 3 mo preceding LEMG were evaluated. A matched control group that did not undergo VFI was also studied. The LEMG team (laryngologist and electromyographer) performed and interpreted LEMG using a pre-specified protocol, including qualitative and quantitative motor unit analysis.Results: Eighteen patients with VFI underwent LEMG successfully with interpretation of spontaneous activity and motor unit recruitment. Fourteen patients were seen in follow-up to determine accuracy of established LEMG prognosis. Seven of seven subjects with poor LEMG prognosis did not recover vocal fold motion. Five of 104 BELSKY ET AL.

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Section: Introductionmentioning

confidence: 93%

Vocal fold injection material does not preclude interpretation of laryngeal electromyography

et al. 2021

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“…Brought to you by | MIT Libraries Authenticated Download Date | 5/13/18 9:42 AM models of needle electrodes used and the different approaches of analysing the records lead to different results among physicians and researchers 4 . In 2010, a working group of neurolaryngologists was created to reach a consensus regarding the guidelines for LEMG performance: indications, technique, interpretation of records and clinical application 5 .…”

Section: Abstract: Electromyography Neurolaryngology Larynx Recurrmentioning

confidence: 99%

Clinical application of laryngeal electromyography – a point of view

Pasu

2017

Romanian Journal of Rhinology

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In recent years, the clinical importance of laryngeal electromyography (LEMG) has been recognized. This method of investigation proved itself to be a valuable and indispensable tool regarding voice disorder management and requires multidisciplinary approach. In this article, we focus on the clinical usefulness of LEMG to assess inferior and superior motor neuron integrity by recording action potentials generated by muscle fibers of the larynx in the new field known as neurolaryngology. To facilitate the clinical application of this electrophysiologic test, we present a detailed description of LEMG techniques, which were applied for simultaneous bilateral recordings of the thyroarytenoid, cricothyroid and posterior cricoarytenoid muscles. Also, we analysed and measured the following electrophysiological parameters: 1) insertional activity; 2) spontaneous activity; 3) recruitment; 4) morphology of waveform. From a practical point of view, in our country, LEMG performance is still not a routine procedure in ENT and Phoniatric Departments. The difficulty of practical use of LEMG in Romania consists in technical limitations and it depends on the physician’s experience regarding the examination technique and also the interpretation of electrophysiological results. Our current clinical experience shows that the use of LEMG contributes especially to the diagnosis, prognosis and treatment of patients with neurolaryngological disorders.

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“…Laryngeal electromyography (EMG) is a well‐established means to evaluate the neuromuscular activity of both intrinsic and extrinsic laryngeal musculature . Two modalities of EMG have emerged over decades of electrophysiologic inquiry: invasive needle‐based electromyography (nEMG) and surface electromyography (sEMG).…”

Section: Introductionmentioning

confidence: 99%

“…nEMG is an invasive test, potentially uncomfortable for patients, and requires technical skill for placement of electrodes and interpretation of tracings. In most cases, the duration of inquiry is also limited due to the necessity of clinical and/or lab settings for needles or hook wires to collect electrophysiologic signal . It is, however, an excellent test for identifying morphological characteristics of the motor unit signal and has applicability in numerous clinical scenarios .…”

Section: Introductionmentioning

confidence: 99%

“…The placement of needle electrodes directly into target tissues by experienced operators affords confidence that the signal obtained is reflective of the interrogated target muscle. Practical concordance between nEMG signals of the same laryngeal muscle have been found to be 95% in experienced hands . Although extremely informative, it is not practical for widespread use due to the aforementioned limitations.…”

Section: Introductionmentioning

confidence: 99%

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High‐density surface electromyography: A visualization method of laryngeal muscle activity

et al. 2019

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Objectives/Hypothesis Laryngeal muscle activation is a complex and dynamic process. Current evaluation methods include needle and surface electromyography (sEMG). Limitations of needle electromyography include patient discomfort, interpretive complexity, and limited duration of recording. sEMG demonstrates interpretive challenges given loss of spatial selectivity. Application of high‐density sEMG (HD sEMG) arrays were evaluated for potential to compensate for spatial selectivity loss while retaining benefits of noninvasive monitoring. Study Design Basic science. Methods Ten adults performed phonatory tasks while a 20‐channel array recorded spatiotemporal data of the anterior neck. Data were processed to provide average spectral power of each electrode. Comparison was made between rest, low‐, and high‐pitch phonation. Two‐dimensional (2D) spectral energy maps were created to evaluate use in gross identification of muscle location. Results Three phonatory tasks yielded spectral power measures across the HD sEMG array. Each electrode within the array demonstrated unique power values across all subjects (P < .001). Comparison of each electrode to itself across phonatory tasks yielded differences in all subjects during rest versus low versus high, rest versus low, and rest versus high and in 9/10 subjects (P < .001) for low versus high phonation. Symmetry of HD sEMG signal was noted. Review of 2D coronal energy maps allowed for gross identification of cricothyroid muscle amidst anterior strap musculature. Conclusions HD sEMG can be used to identify differences in anterior neck muscle activity between rest, low‐, and high‐pitch phonation. HD sEMG of the anterior neck holds potential to enhance diagnostic and therapeutic monitoring for pathologies of laryngeal function. Level of Evidence NA Laryngoscope, 129:2347–2353, 2019

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Laryngeal Electromyography: Are the Results Reproducible?

Cited by 6 publications

References 13 publications

Vocal fold injection material does not preclude interpretation of laryngeal electromyography

Vocal fold injection material does not preclude interpretation of laryngeal electromyography

Clinical application of laryngeal electromyography – a point of view

High‐density surface electromyography: A visualization method of laryngeal muscle activity

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