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Far-field potentials from peripheral nerve

Generated at sites of muscle mass change

Vancouver General Hospital, Vancouver, BC, Canada.

Using a forearm-sternal referential recording montage, three peripheral nerve far-field potentials, P4, P7, and P9, were elicited by median nerve stimulation. The latencies correlated with the distances between the stimulating cathode at the wrist and the proximal forearm, mid-upper arm, and the shoulder, respectively. At these sites, the electrophysical characteristics of the surrounding volume conductor suddenly changes. Altered girth of muscle mass seemed to be a factor.

Address correspondence and reprint requests to Dr. Eisen, Electromyography, The Vancouver General Hospital, 855 West 12th Avenue, Vancouver, BC, V5Z 1M9, Canada.

Supported by The Medical Research Council of Canada (MA-8712).

Accepted for publication October 1, 1985.

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