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Figure 3 Electrocardiographic and intracardiac tracings of (A) atypical AFL and (B) "organized" AF, each showing atypical and varying F waves. (Middle panels) correlation series of each template to its ECG. (Bottom panels) spectra from 213 points (4 s shown) show a dominant peak (A) at 3.2 Hz that is narrow, with area ratio of 0.48 (2.5-Hz bandwidth), and tall (relative height 9.2 dB), suggesting a single AFL circuit; (B) at 6.07 Hz (3- to 10-Hz window) that is broader (area ratio 0.33) and shorter (3.7 dB), suggesting multiple AF wave fronts with mean pulmonary vein (PV) cycle length (CL) predicted by ECG-derived frequency of 6.07 Hz. Other abbreviations as in Figures 1 and 2.
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