Key result
Near-threshold diastolic stimulation resulted in break excitation originating from virtual anodes, whereas strong stimuli (x5 threshold) resulted in make excitation starting from virtual cathodes.
The study demonstrates that near-threshold diastolic stimulation causes break excitation from virtual anodes, providing mechanistic insights into cardiac pacing and arrhythmogenesis.
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No immediate changes to clinical pacing; hypothesis-generating for virtual electrode effects in arrhythmogenesis.
Nikolski et al. (2002) studied Cardiac excitation mechanisms (n=12). Anodal and cathodal 2-ms stimuli vs. Strong stimuli (x5 threshold) was evaluated on Excitation wavefront origin (make vs break excitation). Near-threshold diastolic stimulation resulted in break excitation originating from virtual anodes, whereas strong stimuli (x5 threshold) resulted in make excitation starting from virtual cathodes.
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