Electrophysiological evaluation of conduction in the most proximal motor root segment |
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Authors: | Inaba Akira Yokota Takanori Otagiri Asuka Nishimura Tomoko Saito Yukinobu Ichikawa Tadashi Mizusawa Hidehiro |
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Affiliation: | Department of Neurology, Tokyo Medical and Dental University, 5-45, Yushima 1-chome, Bunkyo-ku, Tokyo, 113-8519 Japan. |
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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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Keywords: | amyotrophic lateral sclerosis cervical magnetic stimulation inflammatory demyelinating neuropathies root conduction time threshold |
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