The clinical value of laryngeal electromyography in laryngeal immobility. 2011

Fabiano Bleggi Gavazzoni, and Rosana Herminia Scola, and Paulo José Lorenzoni, and Cláudia Suemi Kamoi Kay, and Lineu Cesar Werneck
Electromyography Unit, Division of Neurology, Department of Internal Medicine, Hospital de Clínicas da Universidade Federal do Paraná (UFPR), Rua General Carneiro 181, Curitiba PR 80060-900, Brazil.

Although laryngeal electromyography (LEMG) is commonly performed, there are no data confirming its efficacy. We evaluated 40 patients with a laryngoscopic diagnosis of unilateral vocal-fold immobility who underwent LEMG of the thyroarytenoid (TA) and cricothyroid (CT) muscle, with the immobile side of each muscle being compared to the normal side. The immobile side compared to the normal side showed more fibrillation potentials and positive sharp waves for the TA (p=0.04), longer MUAP duration for the TA (p=0.04) and CT (p=0.01), more polyphasic potentials for the TA (p=0.002), and more frequent decreased recruitment for the TA (p<0.01) and CT (p=0.008). Specificity and positive predictive value were around 90%. Sensitivity, negative predictive value and accuracy were around 50%. These results suggest that altered LEMG findings are reliable and they can be used to determine the innervation status of an immobile muscle. Conversely, when the LEMG is normal, the results should be reviewed.

UI MeSH Term Description Entries
D007821 Laryngeal Muscles The striated muscle groups which move the LARYNX as a whole or its parts, such as altering tension of the VOCAL CORDS, or size of the slit (RIMA GLOTTIDIS). Cricothyroid Muscles,Aryepiglottic Muscle,Arytenoid Muscle,Cricoarytenoid Muscles,Thyroarytenoid Muscles,Thyroepiglottic Muscle,Vocal Muscle,Vocalis Muscle,Aryepiglottic Muscles,Arytenoid Muscles,Cricoarytenoid Muscle,Cricothyroid Muscle,Laryngeal Muscle,Muscle, Aryepiglottic,Muscle, Arytenoid,Muscle, Cricoarytenoid,Muscle, Cricothyroid,Muscle, Laryngeal,Muscle, Thyroarytenoid,Muscle, Thyroepiglottic,Muscle, Vocal,Muscle, Vocalis,Muscles, Aryepiglottic,Muscles, Arytenoid,Muscles, Cricoarytenoid,Muscles, Cricothyroid,Muscles, Laryngeal,Muscles, Thyroarytenoid,Muscles, Thyroepiglottic,Muscles, Vocal,Muscles, Vocalis,Thyroarytenoid Muscle,Thyroepiglottic Muscles,Vocal Muscles,Vocalis Muscles
D008297 Male Males
D008875 Middle Aged An adult aged 45 - 64 years. Middle Age
D004576 Electromyography Recording of the changes in electric potential of muscle by means of surface or needle electrodes. Electromyogram,Surface Electromyography,Electromyograms,Electromyographies,Electromyographies, Surface,Electromyography, Surface,Surface Electromyographies
D005260 Female Females
D006801 Humans Members of the species Homo sapiens. Homo sapiens,Man (Taxonomy),Human,Man, Modern,Modern Man
D012680 Sensitivity and Specificity Binary classification measures to assess test results. Sensitivity or recall rate is the proportion of true positives. Specificity is the probability of correctly determining the absence of a condition. (From Last, Dictionary of Epidemiology, 2d ed) Specificity,Sensitivity,Specificity and Sensitivity
D014826 Vocal Cord Paralysis Congenital or acquired paralysis of one or both VOCAL CORDS. This condition is caused by defects in the CENTRAL NERVOUS SYSTEM, the VAGUS NERVE and branches of LARYNGEAL NERVES. Common symptoms are VOICE DISORDERS including HOARSENESS or APHONIA. Laryngeal Nerve Palsy, Recurrent,Laryngeal Paralysis,Acquired Vocal Cord Palsy,Bilateral Vocal Cord Paresis,Congenital Vocal Cord Palsy,Paralysis, Unilateral, Vocal Cord,Paralysis, Vocal Cord, Unilateral,Partial Paralysis (Paresis) Vocal Cords,Recurrent Laryngeal Nerve Palsy,Total Vocal Cord Paralysis,Unilateral Paralysis, Vocal Cord,Unilateral Vocal Cord Paralysis,Unilateral Vocal Cord Paresis,Vocal Cord Palsy,Vocal Cord Palsy, Congenital,Vocal Cord Paralysis, Unilateral,Vocal Cord Paresis,Vocal Fold Palsy,Laryngeal Paralyses,Palsies, Vocal Cord,Palsies, Vocal Fold,Palsy, Vocal Cord,Palsy, Vocal Fold,Paralyses, Laryngeal,Paralyses, Vocal Cord,Paralysis, Laryngeal,Paralysis, Vocal Cord,Pareses, Vocal Cord,Paresis, Vocal Cord,Vocal Cord Palsies,Vocal Cord Paralyses,Vocal Cord Pareses,Vocal Fold Palsies

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