Suppressions of spiral waves and spatiotemporal chaos in cardiac tissue
心脏中的螺旋波和时空混沌的抑制研究

Suppressions of spiral waves and spatiotemporal chaos in cardiac tissue are investigated by using the Luo-Rudy phase I model. Two control methods are proposed.(Ⅰ) A planar wave is generated by alternately changing the extracellular potassium ion concentration, and then a weak external electric field is used to help plane wave to suppress spiral waves and spatiotemporal chaos.(Ⅱ) The extracellular potassium ion concentration is first enhanced.Planar waves are then generated by the wave emission induced by an external electric field.We use the planar waves to suppress the spiral waves and spatiotemporal chaos.The results show that the control methods can effectively suppress spiral waves and spatiotemporal chaos when relevant parameters are appropriately chosen.When regional myocardial ischemia occurs,high extracellular potassium ion concentration will appear where myocardial ischemia occurs. The methods of wave emission can be used to suppress spiral waves and spatiotemporal chaos in heart in this case.The advantages and mechanism of the control methods are explained.