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Figure 3 Isochronal map showing type I figure-of-eight re-entry in the right posterior oblique view. The activation wave front propagated through the conduction gap in the crista terminalis (CT) and separated into two wave fronts. The counterclockwise wave front (virtual 8 to 13) rotated around the superior vena cava (SVC) and upper CT, and the clockwise wave front (virtual 14 to 18) rotated around the inferior vena cava (IVC) and lower CT. The virtual electrogram 9 at the CT gap showed low amplitude potential between double potentials, representing slow conduction. RAA = right atrial appendage.