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Vortex Cordis as a Mechanism of Postshock Activation:

Introduction: The ventricular apex has a helical arrangement of myocardial fibers called the “vortex cordis.” Experimental studies have demonstrated that the first postshock activation originates from the ventricular apex, regardless of the electrical shock outcome; however, the related underlying mechanism is unclear. We hypothesized that the vortex cordis contributes to the initiation of postshock activation. To clarify this issue, we numerically studied the transmembrane potential distribution produced by various electrical shocks.