Spatiotemporal chaos due to spiral waves core expansion and its elimination in excitable media
In the framework of the FitzHugh-Nagumo kinetics and the oscillatory recovery in excitable media, we present a new type of meandering of the spiral waves, which leads to spiral break up and spatiotemporal chaos. The tip of the spiral follows an outward spiral-like trajectory and the spiral core expands in time. This type of destabilization of simple rotation is attributed to the effects of curvature and the wave-fronts interactions in the case of oscillatory damped recovery to the rest state. This model offers a new route to and caricature for cardiac fibrillation, and when we apply the feedback resonant drift method, for defibrillation all wave activity gets eliminated at the unexcitable boundaries. CYBERNETICS AND PHYSICS, Vol. 1, No. 3, 2012 , 198–203.