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We report a young wheelchair-dependent patient with an unclear proximal myopathy and a heterozygous, de-novo Cav1.1-R1239G mutation suggesting hypokalemic periodic paralysis (HypoPP). Sonography showed a loss of the pennate pattern indicative of an edema, whereas fatty degeneration was excluded. Within 7 days of therapy with spironolactone, potassium and physical therapy, muscle strength almost completely...
Fast and slow inactivation (FI, SI) of the voltage-gated Na + channel are two kinetically distinct and structurally dissociated processes. The voltage sensor IV/S4 and the intracellular IV/S4-S5 loop have been shown to play an important role in FI mediating the coupling between activation and inactivation. Two mutations in IV/S4-S5 of the human muscle Na + channel, L1482C/A, disrupt...
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