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- W2024340007 abstract "High-energy electrical ablation is a new experimental approach to control arrhythmias. In this study, the cellular electrophysiologic effects of high-energy shocks (5 to 40 J) delivered in vitro to 14 epicardial tissues from 11 dogs were studied in an attempt to understand the nature and extent of injury as well as potential arrhythmogenic mechanisms. In addition, this preparation was used to test the importance of cathode-anode configuration, current density, and fiber orientation in the induction of tissue injury in vitro. Electrophysiologic abnormalities were noted up to 10 mm from the electrode wall, and their extent was determined in part by current density and the cathode-anode orientation. A decrease in resting membrane potential, action potential amplitude, and dV/dT occurred in all tissues after high-energy shocks, which was worst nearest the cathode and of graded severity at increasing distances from the cathode. The most severe effects were noted with high current densities and in tissues located between the cathode and anode. In addition, impaired impulse conduction and abnormal repolarization were documented. Histologic study demonstrated contraction band necrosis immediately after delivery of high-energy shocks. The extent and distribution of the contraction bands was in part dependent on the energy delivered and the cathode-anode configuration. These findings suggest potential mechanisms for arrhythmogenesis and altered regional hemodynamic abnormalities that occur in vivo." @default.
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- W2024340007 date "1986-04-01" @default.
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- W2024340007 title "The cellular electrophysiologic changes induced by high-energy electrical ablation in canine myocardium." @default.
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- W2024340007 doi "https://doi.org/10.1161/01.cir.73.4.818" @default.
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