Figure 3 Ablation strategies in mirror detrocardia. A) Intracavitary electrograms suggest that coronary sinus 7-8 activations is the earliest. B) Right atrial excitation mapping suggests that the earliest activation point is referenced 38 ms in advance. C) Non-coronary sinus excitation mapping suggests that the earliest excitation point is referenced 73 ms in advance. D) Atrial tachycardia terminated in 2s after radiofrequency was started in Non-coronary sinus.