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Figure 1 Three-dimensional electroanatomic activation map (CARTO) of the right atrium showing the ability to tag anatomical structure relevant to the ablation procedure. (A) Right anterior oblique view of the right atrium during inappropriate sinus tachycardia. The gray tags represent sites where pacing was able to stimulate the phrenic nerve. Green tags reproduce the course of the crista terminalis. (B) The same activation map as in A, but in a more posteriorly rotated view. (C) The caudal shift of the earliest activation site following sinus node modification.