David S. Campion, M.D.

Myopathy

In myopathy, a disease of the muscle rather than the nerves, there is usually a great variation in the size of the muscle fibers. As a consequence the rate at which the individual muscle fibers conduct their signal varies considerably and the electrical signal picked up by the EMG needle is fragmented and reduced in size. The body tries to compensate for the weakness by firing the nerve signals faster and consequently the hallmark of myopathy is small, short, fast firing motor units.

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Electro Diagnostic Medicine

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Clinic (24-12-2020)
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