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Figure 3 Inter- and intracycle atrial temporospatial loops. Plotting correlation (‘r’) values each time point between axes yields XY, YZ, and XZ atrial and ventricular loops. (A) Isthmus-dependent atrial flutter. Atrial loops approach the (1,1) coordinate, are reproducible, and have excursion from origin, R = 1.51 ± 0.03 (i.e., spatially coherent). (B) Non-isthmus-dependent atrial flutter. Loops do not approach (1,1) (R = 0.92 ± 0.08) and are irreproducible, showing atrial wavefront variability amplified by this analysis.