Criteria of conduction block:introduction of AAEM criteria Katsumi Kurokawa 1 , Masahiro Sonoo 2 1Department of Neurology, Kawasaki Medical School 2Department of Neurology, Teikyo University School of Medicine Keyword: 伝導ブロック , temporal dispersion , 判定基準 , 慢性炎症性脱髄性多発根ニューロパチー , CIDP pp.492-500
Published Date 2003/8/10
DOI https://doi.org/10.11477/mf.1431100332
  • Abstract
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 Conduction block(CB)is an important finding to diagnose demyelinating neuropathies. Several different criteria of CB have been proposed so far, bringing about significant confusion to diagnose CB. “Consensus criteria for the diagnosis of partial conduction block” was proposed by the American Association of Electrodiagnostic Medicine(AAEM)in 1999. Here we introduce these consensus criteria, because they should be the standard criteria on CB hereafter. They establish different limit-values for different nerve-segments, and for different degree of temporal dispersion(TD). Finally they provide standards to diagnose definite CB or probable CB. Many technical factors and pitfalls should be fully considered for making a diagnosis of CB correctly. Several of them are mentioned in these criteria, to which we add some issues in the present article. Decrement of amplitude or area of the compound muscle action potentials exceeding the normal range does not constitute a sufficient condition for the diagnosis of CB, especially in chronic diseases such as chronic inflammatory demyelinating polyneuropathy. It is important to distinguish true CB from findings which can be observed for chronic axonal loss or for TD alone.

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