[Modeling of disturbances in electrical and mechanical function of cardiomyocytes under acute ischemia].
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 inward rectifier potassium current I(K1) with increased extracellular potassium concentration has most essential contribution to the changes in the action potential duration under ischemia.
N A
NA
Vikulova
A D
AD
Vasil'eva
D É
DÉ
Zamaraev
O É
OÉ
Solov'eva
V S
VS
Markhasin
D000200:Action Potentials; D000251:Adenosine Triphosphatases / Q000378:metabolism; D000255:Adenosine Triphosphate / Q000378:metabolism; D000818:Animals; D027682:Cation Transport Proteins / Q000378:metabolism; D015687:Cell Hypoxia; D006801:Humans; D017136:Ion Transport; D007700:Kinetics; D008955:Models, Cardiovascular; D009200:Myocardial Contraction; D017202:Myocardial Ischemia / Q000378:metabolism* / Q000473:pathology / Q000503:physiopathology*; D032383:Myocytes, Cardiac / Q000378:metabolism* / Q000473:pathology; D011188:Potassium / Q000378:metabolism
D027682:Cation Transport Proteins; D000255:Adenosine Triphosphate; D000251:Adenosine Triphosphatases; C022761:potassium transporting ATPase; D011188:Potassium