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Acoustic and surface EMG diagnosis of pediatric muscle disease

✍ Scribed by Dr. Daniel T. Barry; Dr. Kevin E. Gordon; George G. Hinton

Publisher
John Wiley and Sons
Year
1990
Tongue
English
Weight
369 KB
Volume
13
Category
Article
ISSN
0148-639X

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✦ Synopsis

Abstract

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 > 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.

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