Major Patterns of Laryngeal Electromyography and Their Clinical Application

Yin, Shengguang S.; Qiu, William W.; Stucker, Fred J.

doi:10.1097/00005537-199701000-00024

Cited by 62 publications

(54 citation statements)

References 18 publications

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“…Normal recruitment pattern of LEMG is most commonly found in arytenoid dislocation (9) and also may appear in a patient with prolonged intubation (10). LEMG findings in our case concurrently revealed neuropathic (denervation or partial denervation) patterns in bilateral thyroarytenoid and cricothyroid muscles.…”

Section: Discussionsupporting

confidence: 62%

Isolated bilateral vocal cord paralysis with intermediate syndrome after organophosphate poisoning

Jin

Jeong

Lee

2008

Clinical Toxicology

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Introduction. Muscular weakness affecting predominantly the proximal limb muscles and neck flexors is the cardinal feature of intermediate syndrome with cranial nerve palsies occasionally accompanied. Following acute cholinergic phase of organophosphate poisoning (OPP), only a few isolated cases of vocal cord paralysis have been reported in the past. We describe a case of bilateral vocal cord paralysis which occurred in the wake of a clinical recovery from acute cholinergic crisis in OPP. Case report. A 32-year-old woman presented with severe cholinergic crisis after ingestion of an unknown amount of dichlorvos in a suicide attempt. The patient was improved from cholinergic crisis by administration of antidotes. On day 4, she complained of progressive dyspnea and dysphonia after removal of the endotracheal tube. Needle electromyography for neuromuscular confirmation was normal. However, laryngeal electromyography (LEMG) findings were consistent with bilateral laryngeal paralysis suggesting the vagus nerve involvement. Her vocal cord movements were restored to near normal with time and she was discharged on the 20th day after admission. Conclusions. Physicians should account for the neurotoxic effects of organophosphate poisoning during the first line management of exposed patients. Isolated bilateral vocal cord paralysis (BVCP) should be excluded as a cause, if dysphonia or respiratory distress occurs after extubation in patients with intermediate syndrome. LEMG in such cases can be an important diagnostic adjunct.

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Section: Discussionsupporting

confidence: 62%

Isolated bilateral vocal cord paralysis with intermediate syndrome after organophosphate poisoning

Jin

Jeong

Lee

2008

Clinical Toxicology

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“…It was included as a diagnostic and therapeutic tool for laryngeal and voice disorders in the late 1980s. 2,3 There are few references about the use of this method for studying laryngeal muscles in patients with Parkinson's disease. These studies have assumed that voice dysfunction was caused by the motor control peculiarities of this disease.…”

Section: Introductionmentioning

confidence: 99%

Eletromiografia laríngea e análise vocal em pacientes com Mal de Parkinson: estudo comparativo

Zarzur

Duarte²,

Gonçalves

et al. 2010

Braz. j. otorhinolaryngol. (Impr.)

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Parki nson's disease (PD) involves a progressive depletionof dopamine in the basal ganglia leading to motor alterations. Oral communication impairment occurs in 75% to 90% of patients and has been poorly studied. Aim: to asses laryngeal electromyography (LEMG) patterns and correlate them to vocal analysis in patients with Parkinson's disease. Materials and Methods: This is a prospective study. Twenty six adults with PD underwent laryngeal electromyography. Rest and phonation potentials were analyzed. VOXMETRIA® and GRAM 5.1.6. ® were used in acoustic analysis. Results: The main electromyographic pattern observed in the PD group was rest hypertonicity meaning that patients with PD presented with spontaneous intrinsic laryngeal muscle activity during voice rest, which occurred in 73% of the individuals. Not a case of laryngeal tremor was detected by electromyography, although vocal tremor was detected by VOXMETRIA in 69.5% of the individuals and in 61% of them by perceptive-auditive analysis. Conclusion: Vocal tremor was the main acoustic change in the PD group, with no correlation to LEMG findings.

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“…The production of sound requires fine and precise motor synchronism of the laryngeal muscles; this is often affected in movement disorder patients 1 . Laryngeal electromyography (LEMG) is a useful diagnostic method for motor unit disorders [2][3][4][5][6][7][8] ; it can be used to establish the cause of laryngeal immobility [9][10][11] and help guide the needle to the correct location for botulinum toxin administration in laryngeal hyperkinetic movement disorder patients [12][13][14] . We describe preliminary LEMG pattern data from 25 patients complaining of dysphonia attending UNICAMP movement disorders ambulatory whose clinical examinations and laryngeal endoscopies suggested vocal fold hyperkinetic movement disorders.…”

mentioning

confidence: 99%

Laryngeal electromyography in movement disorders: preliminary data

Kimaid¹,

Quagliato²,

Crespo

et al. 2004

Arq. Neuro-Psiquiatr.

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-This study describes preliminary laryngeal electromyography (LEMG) data and botulinum toxin treatment in patients with dysphonia due to movement disorders. Twenty-five patients who had been clinically selected for botulinum toxin administration were examined, 19 with suspected laryngeal dystonia or spasmodic dysphonia (SD), 5 with vocal tremor, and 1 with Gilles de la Tourette syndrome (GTS). LEMG evaluations were performed before botulinum toxin administration using monopolar electrodes. Electromyography was consistent with dystonia in 14 patients and normal in 5, and differences in frequency suggesting essential tremor in 3 and Parkinson tremors in 2. The different LEMG patterns and significant improvement in our patients from botulinum toxin therapy has led us to perform laryngeal electromyography as a routine in UNICAMP movement disorders ambulatory.

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Major Patterns of Laryngeal Electromyography and Their Clinical Application

Cited by 62 publications

References 18 publications

Isolated bilateral vocal cord paralysis with intermediate syndrome after organophosphate poisoning

Isolated bilateral vocal cord paralysis with intermediate syndrome after organophosphate poisoning

Eletromiografia laríngea e análise vocal em pacientes com Mal de Parkinson: estudo comparativo

Laryngeal electromyography in movement disorders: preliminary data

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