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NEUROLOGY 1987;37:410
© 1987 American Academy of Neurology

Bipolar recording of short-latency somatosensory evoked potentials after median nerve stimulation

Ryuji Kaji, MD and Austin J. Sumner, MD

Department of Neurology, University of Pennsylvania, Philadelphia, PA.

Generators of median short-latency somatosensory evoked potentials were studied with three orthodiagonal pairs of bipolar electrodes. N11 was attributed to the dorsal root and dorsal column volleys. N13 had at least two subcomponents, generator dipoles of which are directed horizontally (N13a) and axially (N13b). N13a was generated in the lower cervical cord. N13b (bipolar) and P14 far-field (noncephalic reference) appeared to originate in the cuneate nucleus or spino-cerebellar tracts as well as in the medial lemniscus. Bipolar recordings were useful in localizing cervical cord lesions, which was impossible in conventional monopolar recordings.

Address correspondence and reprint requests to Dr. Kaji, Department of Neurology, Hospital of the University of Pennsylvania, 3400 Spruce Street, Philadelphia, PA 19104.

Received February 14, 1986. Accepted for publication in final form June 24, 1986.






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