Muscle channelopathies: the nondystrophic myotonias and periodic paralyses.

Abstract excerpt

PURPOSE OF REVIEW: The muscle channelopathies are a group of rare inherited diseases caused by mutations in muscle ion channels. Mutations cause an increase or decrease in muscle membrane excitability, leading to a spectrum of related clinical disorders: the nondystrophic myotonias are characterized by delayed relaxation after muscle contraction, causing muscle stiffness and pain; the periodic paralyses are...

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