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Figure 1 Complete cavotricuspid isthmus block during coronary sinus (CS) pacing after ablation. (A) After ablation, the activation wavefront originated in the CS ostium region blocked at the ablation line and propagated upward the septal wall. (B) The activation wavefront activated the roof and crossed the top of the crista terminalis. (C) The activation wavefront activated the high anterolateral wall and propagated downward. (D) The activation wavefront activated the low anterolateral wall and ended at the ablation line. The second component of virtual electrograms (virtual 6 to 10) at the ablation line showed an Rs pattern.
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