Acoustic and surface EMG diagnosis of pediatric muscle disease

The ratio of acoustic myography (AMG) amplitude to surface electromyography (EMG) amplitude is proposed as a measure of mechanical output compared with electrical activity of the contractile system. AMG to EMG ratios were measured from 16 children with muscle disease diagnosed by clinical criteria,...

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Bibliographic Details
Published in:	Muscle & nerve Vol. 13; no. 4; p. 286
Main Authors:	Barry, D T, Gordon, K E, Hinton, G G
Format:	Journal Article
Language:	English
Published:	United States 01-04-1990
Subjects:	Adolescent Child Electromyography Female Humans Male Muscle Contraction - physiology Muscular Dystrophies - physiopathology Neuromuscular Diseases - physiopathology Sound
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Summary:	The ratio of acoustic myography (AMG) amplitude to surface electromyography (EMG) amplitude is proposed as a measure of mechanical output compared with electrical activity of the contractile system. AMG to EMG ratios were measured from 16 children with muscle disease diagnosed by clinical criteria, EMG, and/or muscle biopsy. These were compared with the ratios from 11 normal volunteers spanning the same age range (7-16 years). AMG to EMG ratios were significantly (P less than 0.01) different for the two populations. Using a linear discriminant function to define the normal range for AMG to EMG ratios yielded a sensitivity of 82% (13 of 16 abnormals diagnosed) and a specificity of 91% (10 of 11 normals). These findings suggest that surface recordings may provide significant diagnostic information in muscle disease. The accuracy may be improved further by using additional muscles (e.g., paraspinals) and evoked twitches.
ISSN:	0148-639X
DOI:	10.1002/mus.880130403