Electrophysiological evaluation of conduction in the most proximal motor root segment.
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.
Inaba
Akira
A
Department of Neurology, Tokyo Medical and Dental University, 5-45, Yushima 1-chome, Bunkyo-ku, Tokyo, 113-8519 Japan.
Yokota
Takanori
T
Otagiri
Asuka
A
Nishimura
Tomoko
T
Saito
Yukinobu
Y
Ichikawa
Tadashi
T
Mizusawa
Hidehiro
H
D000200:Action Potentials / Q000502:physiology; D000293:Adolescent; D000328:Adult; D000368:Aged; D000690:Amyotrophic Lateral Sclerosis / Q000175:diagnosis / Q000503:physiopathology*; D000870:Anterior Horn Cells / Q000473:pathology / Q000503:physiopathology*; D002574:Cervical Vertebrae; D004185:Disability Evaluation; D004558:Electric Stimulation; D005260:Female; D020275:Guillain-Barre Syndrome / Q000175:diagnosis / Q000503:physiopathology*; D006801:Humans; D008280:Magnetics; D008297:Male; D008875:Middle Aged; D009431:Neural Conduction / Q000502:physiology*; D020277:Polyradiculoneuropathy, Chronic Inflammatory Demyelinating / Q000175:diagnosis / Q000503:physiopathology*; D011930:Reaction Time / Q000502:physiology; D020127:Recovery of Function / Q000502:physiology; D013126:Spinal Nerve Roots / Q000473:pathology / Q000503:physiopathology*