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Sputtering positive potentials in the EMG

An artifact resembling positive waves

Department of Neurology, University of California, San Francisco.

Sputtering positive potentials (SPPs) in the electromyogram are small, irregularly occurring waveforms recorded in normal distal muscles. They represent cannula-recorded "nerve" potentials, but may be mistaken for the positive waves seen in denervation. Differences in amplitude, regularity, and duration help in distinguishing SPPs.

Address correspondence and reprint requests to Dr. Pickett, Department of Neurology, University of California, San Francisco, CA 94143.

Accepted for publication, June 13, 1979.

Presented in part at the annual meeting of the American Association of Electromyography and Electrodiagnosis, Salt Lake City, Utah, September 30 October 1, 1977.

This article has been cited by other articles:

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