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A Comparative Study

Hans Lueders, MD; Dudley S. Dinner, MD; Ronald P. Lesser, MD; George Klem, REEGT

Arch Neurol. 1983;40(2):93-97.

Abstract
• Posterior tibial nerve (PTN) evoked potentials (EPs) at the lumbar—low thoracic level have waveforms similar to median nerve (MN) EPs at the cervical level. They consist of a short-duration negativity (N18 and N10, respectively), which reflects the afferent volley before it enters the spinal canal, and a longer-duration, later negativity (N20 and N12, respectively), which consists mainly of slow frequencies and most probably is a postsynaptic dorsal cord potential. At the neck-scalp derivation the MN EP consists of two near-field negativities (N10 and N12) that are recorded from the neck electrode and two far-field positivities (P11 and P13) that are recorded from the scalp electrode. The neck-scalp response to PTN stimulation consists of a near field potential N24 that is followed by a far-field potential P27.

Author Affiliations
From the Section of Electroencephalography and Clinical Neurophysiology, Department of Neurology, Cleveland Clinic.

Footnotes
Accepted for publication May 21, 1982.

Reprint requests to Department of Neurology, Cleveland Clinic Foundation, 9500 Euclid Ave, Cleveland, OH 44106 (Dr Lueders).

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ABSTRACT