Cardiac Spiral Wave Reentry

FitzHugh-Nagumo model of excitable cardiac tissue
∂u/∂t = D∇²u + u(u−a)(1−u) − v (activator: membrane voltage)
∂v/∂t = ε(u − γv) (inhibitor: gating variable)
Spiral wave reentry → ventricular fibrillation. Breakup → multiple wavelets → chaos. Click canvas to apply S2 stimulus (cross-field protocol initiates spiral).
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Click canvas to apply local depolarization stimulus