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Figure 3 Complete cavotricuspid isthmus (CTI) block and transcristal conduction during coronary sinus pacing after ablation. (A) The activation wavefront originated in the coronary sinus ostium (CSO) region and split into two wavefronts. (B) One wavefront propagated upward in the septal wall to the roof, and the other wavefront crossed the gap of the crista terminalis. (C) The upper wavefront crossed over the top of crista terminalis, and the lower wavefront activated the CTI opposite the pacing site. (D) The upper wavefront propagated downward in the anterolateral wall. The second component of virtual electrograms (virtual 10 to 12) showed an rSR pattern.
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