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• W4313485089 abstract "Life-threatening cardiac arrhythmias require immediate defibrillation. For state-of-the-art shock treatments, a high field strength is required to achieve a sufficient success rate for terminating the complex spiral wave (rotor) dynamics underlying cardiac fibrillation. However, such high energy shocks have many adverse side effects due to the large electric currents applied. In this study, we show, using 2D simulations based on the Fenton-Karma model, that also pulses of relatively low energy may terminate the chaotic activity if applied at the right moment in time. In our simplified model for defibrillation, complex spiral waves are terminated by local perturbations corresponding to conductance heterogeneities acting as virtual electrodes in the presence of an external electric field. We demonstrate that time series of the success rate for low energy shocks exhibit pronounced peaks which correspond to short intervals in time during which perturbations aiming at terminating the chaotic fibrillation state are (much) more successful. Thus, the low energy shock regime, although yielding very low temporal average success rates, exhibits moments in time for which success rates are significantly higher than the average value shown in dose-response curves. This feature might be exploited in future defibrillation protocols for achieving high termination success rates with low or medium pulse energies." @default.
• W4313485089 created "2023-01-06" @default.
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• W4313485089 date "2023-01-04" @default.
• W4313485089 modified "2023-10-18" @default.
• W4313485089 title "The role of pulse timing in cardiac defibrillation" @default.
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• W4313485089 doi "https://doi.org/10.3389/fnetp.2022.1007585" @default.
• W4313485089 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/36926106" @default.
• W4313485089 hasPublicationYear "2023" @default.
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