Publication details

Ionic concentration changes in the tubular system of rat ventricular cardiac cell model

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Year of publication 2004
Type Article in Proceedings
Conference Engineering Mechanics 2004
MU Faculty or unit

Faculty of Medicine

Field Biophysics
Keywords cardiac cell; tubular system; quantitative modelling
Description We present a design of a model of rat ventricular cardiomyocyte with transverse-axial tubular system and the results of the first simulations of tubular ionic concentration changes at different stimulation rates. The morphology of tubular system and the distribution of ionic channels in tubular membrane were described to meet the recent data of Soeller and Cannell (1999) and of Orchard's group in Leeds. Exploration of activity-dependent changes in tubular ionic concentrations revealed an increase in relative Ca2+ depletion from 7.3 % to 14 % when increasing the stimulation frequency from 1 Hz to 5 Hz. Meanwhile, relative K+ accumulation decreased from 4.3 % to 3 %. These effects led to a limitation of intracellular Ca2+ overload.
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