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Figure 4 Isochronal map showing type II figure-of-eight re-entry in the right posterior oblique view. The activation wave front propagated through the channel between two central obstacles. One is located in the crista terminalis (virtual 10 to 13), and the other is located in the anterolateral wall combined with the right atrial appendage (virtual 14 to 17). The counterclockwise wave front rotated around the anterior free-wall obstacle, whereas the clockwise wave front rotated around the crista terminalis. IVC = inferior vena cava; RAA = right atrial appendage; SVC = superior vena cava; TV= tricuspid valve.
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