心肌可激媒质中一对螺旋波的碰撞湮灭的数值实验研究

Numerical experimental study of collision-annihilate of pair of spiral waves in cardiac excitable media

利用FHN模型,我们研究了二维心肌可激媒质系统中一对螺旋波,在均匀的周期小电流驱动下,碰撞湮灭条件。发现:(1)驱动电流的初位相决定螺旋波漂移初始方向;两个螺旋波靠近时,它们之间引起排斥作用;(2)在较大的强度驱动时,适当的位相条件下,一对反向的螺旋波将被驱除边界或碰撞湮灭;(3)在共振驱动时,一对反向的螺旋波较易碰撞湮灭。

we studied the collision and annihilation of counter-rotating spiral waves in 2D cardiac excitable media drived by uniform periodic small current with near-resonant freguency. These results are based on the modified FHN model. We find (1) initial phase of drive current decide the drifting direction of pair of spiral waves; they give rise to repelling action when a pair of spiral waves close. (2) And find that when near-resonance driving stronger and shitable phase, a pair of spiral waves can collides and annihilate each other. (3) When resonance driving, the pair of spiral waves collides and annihilate easily each other That supply a method of subthreshold defibrillation of heart.