Estimation of Cardiac Excitation on the Basis of Stimulus Response Functions and Epicardial Activation Isochrones
At a given instant the potential distribution on the body surface is produced by the cells just being depolarized. Even presuming the full knowledge of the body surface potential field it is difficult to retrace the activation process, because this is characterized by the resultant of wave-fronts propagating from different focuses. The interpretation is usually easier if the distribution of the potential and/or current fields on the epicardium are known. The fields generated by the separated wavefronts are superimposed here as well, but their contributions are weighted differently. Though the knowledge of the epicardial fields enables us to obtain exact information on the epicardial activation, the excitation of the deeper layers — especially that of the septum — remains more or less unknown (Taccardi et al., 1972).
KeywordsFiber Orientation Stimulus Response Function Cardiac Excitation Epicardial Activation Chest Surface
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