Advances in electronics in the past 20 years have added many new capabilities to diagnostic medicine. Electromyography and motor and sensory nerve conduction studies are results of this progress. These studies have been found to be of value in the diagnosis and management of some of the collagen diseases and their complications. In myopathies, such as polymyositis and dermatomyositis, electromyography is useful in ascertaining the presence of primary muscle degeneration and can be of assistance in choosing a site for muscle biopsy. Motor and sensory nerve conduction studies provide an objective measure of peripheral nerve function and thereby enable the physician to delineate the presence of peripheral and entrapment neuropathies.
Christopher RP. Electromyography in Collagen Disease. JAMA. 1968;204(10):913–915. doi:10.1001/jama.1968.03140230071012
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