Rappel Wouter-Jan
Department of Physics, University of California, San Diego, La Jolla, California 92093.
Chaos. 2001 Mar;11(1):71-80. doi: 10.1063/1.1338128.
The role of cardiac tissue anisotropy in the breakup of vortex filaments is studied using two detailed cardiac models. In the Beeler-Reuter model, modified to produce stable spiral waves in two dimensions, we find that anisotropy can destabilize a vortex filament in a parallelepipedal slab of tissue. The mechanisms of the instability are similar to the ones reported in previous work on a simplified cardiac model by Fenton and Karma [Chaos 8, 20 (1998)]. In the Luo-Rudy model, also modified to produce stable spiral waves in two dimensions, we find that anisotropy does not destabilize filaments. A possible explanation for this model-dependent behavior based on spiral tip trajectories is offered. (c) 2001 American Institute of Physics.
利用两个详细的心脏模型研究了心脏组织各向异性在涡旋丝破裂中的作用。在经过修改以在二维中产生稳定螺旋波的比勒 - 罗伊特模型中，我们发现各向异性会使平行六面体组织平板中的涡旋丝失稳。这种不稳定性机制与芬顿和卡尔马先前在一个简化心脏模型上的工作中所报道的机制相似[《混沌》8, 20 (1998)]。在同样经过修改以在二维中产生稳定螺旋波的罗 - 鲁迪模型中，我们发现各向异性不会使丝失稳。基于螺旋尖端轨迹为这种模型依赖行为提供了一种可能的解释。(c) 2001美国物理研究所。
