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Japanese

Initial Positive Deflection of the Compound Muscle Action Potential in the Median Nerve Conduction Studies can be Originated from Lumbrical Muscles in Patients with Carpal Tunnel Syndrome Shunsuke Matsumoto 1 , Osamu Hasegawa 2 1Department of Neurology, Kawanami Hospital 2Department of Neurology, Yokohama City University School of Medicine Keyword: initial positive wave , carpal tunnel syndrome , median nerve , lumbrical muscles , volume conduction pp.404-406
Published Date 2000/5/1
DOI https://doi.org/10.11477/mf.1406901595
  • Abstract
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In motor nerve conduction studies we sometimes encounter a small initial positive deflection (IPD) of the compound muscle action potential (CMAP) . This potential represents a volume conduction from nearby muscles other than the objective muscle. We demon-strated recordings of motor nerve conduction studies from two patients with carpal tunnel syndrome (CTS). In patients with CTS IPDs can be recorded from a surface electrode above the abductor pollicis brevis when intense stimuli to the median nerve provoked a stimulus spread to the ulnar nerve.


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電子版ISSN 2185-405X 印刷版ISSN 0006-8969 医学書院

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