Cable parameters, sodium, potassium, chloride, and water content, and potassium efflux in isolated external intercostal muscle of normal volunteers and patients with myotonia congenita

Abstract

A B S T R A C T In isolated fiber bundles of external intercostal muscle from each of 13 normal volunteers and each of 6 patients with myotonia congenita, some or all of the following were measured: concentrations of Na+, K+, and Cl-, extracellular volume, water content, K+ efflux, fiber size, fiber cable parameters, and fiber resting potentials.