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Figure 4 Core size calculation in figure-eight and single RWF VT. Panels A–G, example of a figure-eight pattern, where the core of the right-most reentrant circuit is formed by the obstacle (8-mm diameter). In the left, the RWF rotates counterclockwise. By consecutively joining the red dots, the core of this RWF can be delineated. In panel G, numbers show the location of the channels whose local electrograms are selected for demonstration in panel I. Also shown are the conduction velocities that are uniform around the obstacle but slowest in regions of increased curvature around the PM. Panels J–R, on a different tissue, the same method applied to a case of single RWF rotating clockwise. The core of this rotation is formed in part by the hole. However, when the activation proceeds inferior to the hole, it goes downward, where the PM was located (panels K, L and M). In panel M, the activation again contacts the hole’s boundaries. By joining the red dots, the area surrounded by the activation next to the hole can be identified (the PM insertion) and its area calculated. The summation of this area and the area of the hole is considered the core size. Panel P shows selected channels whose electrograms are shown in panel R, and conduction time longer around the PM. Panels H and Q are mirror-images of the respective tissues.
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