Brachial plexus neuropathy. An electrophysiologic evaluation.

Electromyographic data were analyzed in a retrospective study of 16 patients with idiopathic brachial plexus neuropathy (BPN) and 15 patients with secondary BPN. In both groups, abnormalities on sensory and musculocutaneous motor conduction studies and lack of paraspinal fibrillation potentials on needle examination seemed most helpful in localizing a lesion to the brachial plexus. Routine motor conduction studies (distal and proximal ulnar and median) and F-wave latencies were less helpful.