The electrodiagnosis of Guillain-Barré syndrome subtypes: Where do we stand?
To date there is no electrophysiological gold standard in defining the subtypes of GBS. Recovery of abnormal CMAP amplitude reduction and of conduction slowing, without development of temporal dispersion, has been described in AMAN and AMSAN and is considered related to the impairment of nodes of Ranvier, leading to a transient dysfunction of excitability.
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