Modeling of disturbances in electrical and mechanical function of cardiomyocytes under acute ischemia

Autor: Vladimir S. Markhasin, D. E. Zamaraev, Olga Solovyova, N. A. Vikulova, A. D. Vasilyeva
Rok vydání: 2014
Předmět:
Zdroj: Biophysics. 59:791-799
ISSN: 1555-6654
0006-3509
DOI: 10.1134/s0006350914050297
Popis: The effect of acute myocardial ischemia on the electrical and mechanical function of cardiomyocytes was studied in the framework of a mathematical model of a single cardiomyocyte. Acute ischemia consequences were simulated via a combination of two factors — a reduction of intracellular ATP concentration and an increase in extracellular potassium concentration, which affect the kinetics of ATP-sensitive potassium current and other potassium currents. In accord with experimental data, ischemic models produce action potential shortening and diastolic depolarization, which reduce contractile ability of cardiomyocytes. Utilizing a ‘difference-current integral’ approach, we assessed quantitative contribution of ionic currents to changes in the action potential generation during ischemic injuries. It has been shown that an increase in the amplitude of outward rectifier potassium current I K1 with increased extracellular potassium concentration has most essential contribution to the changes in the action potential duration under ischemia.
Databáze: OpenAIRE
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