Resumo

HERNANDEZ TORANZO, Rebeca; CHARROO RUIZ, Lidia; SANCHEZ GUILLAUME, Jorge Luis  e  BROWN MARTINEZ, Marta. Nervous conduction blockade: criteria and difficulties for its diagnosis. Rev Cubana Invest Bioméd [online]. 2005, vol.24, n.1, pp. 39-46. ISSN 1561-3011.

A review of the electrophysiological concept of nervous conduction blockade was made. In the diagnostic evaluation of neuropathies is very important to know the results of the studies of peripheral nervous conduction and, within them, it is well known the usefulness of electrophysiological variables, such as latency, velocity of conduction and amplitude; however, in the neuropathies there is a group (acquired demyelinizating) in which for their diagnosis it is important to define the presence or not of nervous conduction blockade. To define this process, other parameters of more recent introduction in the interpretation of these techniques, such as the percentage of fall of area and amplitude, respectively, and dispersion, should be taken into account. The variables that should be considered to define it, as well as the difficulties in its confirmation, were discussed. Its physiopathology was described, and the electrophysiological criteria accepted by the American Academy of Neurology for the diagnosis of chronic inflammatory demyelinizating polyradiculoneuropathy were presented

Palavras-chave : Nervous conduction blockade; compound muscular action potential; motor unit potentials.

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