Key result
Optimized electrode placement and timing increases controlled simulated Purkinje fiber length ~2-fold vs previous methods.
Why the study?
Controllability limitations cause failure of previous cardiac alternans control methods in longer Purkinje fibers, necessitating optimized electrode placement and timing.
Optimizing electrode location and feedback timing in simulated Purkinje fibers doubles the length of fibers where cardiac alternans can be controlled.
Localized control limits in fiber models warrant caution; leaves open experimental validation before any clinical translation.
This paper describes a systematic approach to suppressing cardiac alternans in simulated Purkinje fibers using localized current injections. We investigate the controllability and observability of the periodically paced Noble model for different locations of the recording and control electrodes. In particular, we show that the loss of controllability causes the failure of the control approach introduced by Echebarria and Karma [Chaos 12, 923 (2002)] for longer fiber lengths. Furthermore, we explain how the optimal locations for the recording and control electrodes and the timing of the feedback current can be selected, accounting for both linear and nonlinear effects, effectively doubling the length of fibers that can be controlled with previous methods.
No takes yet. Share an insight, caveat, or question.
Garzón et al. (2011) studied Cardiac alternans. Localized current injections (model-based control) vs. Previous methods (Echebarria and Karma) was evaluated on Length of fibers that can be controlled. Optimal selection of recording and control electrode locations and feedback current timing effectively doubled the length of simulated Purkinje fibers that can be controlled compared to previous methods.
Synapse has enriched 5 closely related papers on similar clinical questions. Consider them for comparative context: