An organized activation during atrial fibrillation with a predominant craniocaudal direction on the trabeculated right atrium is frequently present and influences the appearance of "coarse" or "fine" atrial fibrillation as well as F wave polarity on the surface ECG.
In a previous study we have shown that the QRS integral morphology of a 62-lead ECG can be used as a means to localize ectopic activation. Ventricular Tachycardia (VT) with frequencies < 200 beats per minute have clearly distinguisable 'isoelectrical' intervals, whereas rapid VT ( > 250 beats per minute) have not. This could be a serious problem when attempting to localize rapid VT. Choosing two specific instants as zero and linear interpolation of other instants (baseline correction) introduces a (possibly large) error.With increasing frequency the correlation of any single time instant during the heart cycle and the QRS integral approaches 1 or -1. This implies that any error generated by a baseline correction has the same morphology as the QRS integral and will thus not cause niorphological changes in body surface maps of rapid C'T. Therefore baseline correction does not appear to be a very critical procedure for rapid VT.
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