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Introduction
The gain‐of‐function mutations that underlie sodium channel myotonia (SCM) and paramyotonia congenital (PMC) produce differing clinical phenotypes. We used muscle velocity recovery cycles (MVRCs) to investigate membrane properties.
Methods
MVRCs and responses to trains of stimuli were compared in patients with SCM (n = 9), PMC (n = 8), and normal controls (n = 26).
Results
The muscle...
Introduction: Chloride conductance disturbances contribute to sarcolemmal dysfunction in myotonic dystrophy type 1 (DM1) and type 2 (DM2). Studies using muscle velocity recovery cycles (MVRCs) suggest Na+/K+‐adenosine triphosphatase activation becomes defective in advanced DM1. We used MVRCs to investigate muscle excitability in DM1 and DM2. Methods: MVRCs were measured for patients with mild (n =...
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