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Electrodiagnosis in compression neuropathies of the upper extremities.

Compression neuropathies may occur at several points along the course of a nerve. Electrodiagnostic studies are helpful in the evaluation of nerve compression. Nerve conduction studies are the most useful of these techniques in determining the site of compression. Compression neuropathies of the upper extremities are common, and a well planned study is important to localize the site of involvement and the severity of the nerve damage.