[Electrophysiological signs of muscle channelopathies by causal mutation].

Abstract excerpt

Nondystrophic myotonias and familial periodic paralyses are disorders of muscle excitability caused by mutations in genes coding for voltage-gated ion channels. Electromyographic (EMG) diagnosis of these diseases is based on needle searching of myotonic discharges and on several exercise tests, performed by surface recording of compound muscle action potential (CMAP) before and after voluntary contractions of...

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