Figure 3.

Computation of reentry vulnerability index (RVI) and spatial activation-repolarization metrics. Left:Red dot represents a cardiac site P for which RVI is measured. Black dots represent neighboring cardiac sites within a searching radius R. As shown in the example in the box, RVI is the shortest interval between AT at neighboring sites and RT at site P (RT_P-AT_D). Right: Formula for RVI and local gradients measurement. Local gradients of ARI and RT are measured in the same way. Bottom right: Criteria for identifying vulnerable sites to reentry. Abbreviations as in Figure 1, Figure 2.