A. PA projection. Qualitative analysis after setting 0.05-0.5 mV voltage range. Bipolar maps in along and across configurations showed LV in the PW, which we considered compatible with patchy fibrosis (set of different colors), while in the IW only normal tissue (purple color) was observed in the along configuration and partially patchy fibrosis in the across configuration. Finally, omnipolar maps in the HD-wave configuration showed normal tissue in both the PW and IW. Note the gray color in the bipolar map, which demonstrates isolation of pulmonary veins, and the red color in the omnipolar map, which seems not to completely prove PVI. B. Re-evaluation after setting 0.5-1.0 mV voltage range. The along and across bipolar HD maps showed an LV increase, with a shift to gray (transformation from potential patchy fibrosis into scar). The HD-wave map also showed an LV increase, but with a shift from purple to a set of different colors (transformation from normal tissue to potential patchy fibrosis). Note that pulmonary veins are isolated in both bipolar and HD-wave maps (gray color in both).
Fig. 4. Choice of the optimal range within which to identify potential patchy fibrosis