Electrophysiological evaluation of conduction in the most proximal motor root segment
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Updated: Oct 1, 2026
The Preparation of Oblique Spinal Cord Slices for Ventral Root Stimulation
Published on: October 13, 2016
Akira Inaba1, Takanori Yokota, Asuka Otagiri
1Department of Neurology, Tokyo Medical and Dental University, 5-45, Yushima 1-chome, Bunkyo-ku, Tokyo, 113-8519 Japan.
Abstract:
Root conduction time (RCT), defined as the time difference between M-wave latency by cervical magnetic stimulation (CMS) and the total peripheral motor conduction time calculated from the shortest F-wave latency, was investigated in patients with inflammatory demyelinating neuropathies (IDP) and amyotrophic lateral sclerosis (ALS). The minimal threshold for CMS also was studied. In the IDP patients, conduction in the proximal motor root segment was considered abnormal in 52% by the RCT and in 47% by the minimal threshold for CMS, whereas both were normal in 85% of the ALS patients. These findings suggest that the RCT and minimal threshold for CMS might be additional parameters for evaluating motor nerve conduction in IDP.
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