Pathological analysis of myocardial cell under ventricular tachycardia andfibrillation based on symbolic dynamics

Ventricular fibrillation (VF) is one of the most,serious malignant arrhythm ias usually resulting from immediate degeneration of ventricular tachycardi a (VT). In order to analyse the nonlinear dynamics of the cardiac micro-mec hanism under VT and VF rhythm, at the cellular level, myocardial cell actio n potentials are investigated tinder different rhythm, normal sinus rhythm, VT and VF. On the basis of nonlinear chaotic theory and symbolic dynamics, we put forward new definitions, complexity rate, etc, and obtained some us eful properties for cellular electrophysiological analysis. The results of the experiments and computation show that the myocardial cellular signals u nder VT and VF rhythm are different kinds of chaotic signals in that the ca rdiac chaos attractor under VF is higher than that under VT. The analytical complexity theory has been promising in the clinical application.