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Background Because radiofrequency catheter ablation of macroreentrant atrial tachycardia (AT) following cardiac surgery of structural heart disease had a low successful rate and a high recurrence, we aimed to explore a successful method to solve this problem.This study was to investigate the electrophysiological mechanisms and radiofrequency catheter ablation of macro-reentrant atrial tachycardia (AT) following cardiac surgery of structural heart disease, and to test the success rate by using CARTO electroanatomic mapping.