Mapping Results
The AT mapping results are shown in Table 2. A total of 21 sustained ATs were mapped in the 8 patients. Four patients presented 2 different ATs during ablation, 3 patients presented 3 different ATs during ablation, and 1 patient presented 4 different ATs during ablation. In 7 patients, every AT converted to another one after ablation, and each one was shown to be a new kind of AT. The ATs in one patient (the 7th patient) were suspected to be related to VOM. The different activation mapping results were suspicious due to the activation direction changes by the block of ablation lines and perhaps represented the same reentry through different activation modes. The final entrainment mapping features and ablation site termination AT coincided with VOM-related AT, as previously described (Fig. 3).6,7 In the first mapping, 4 patients showed the type of localized ATs related to scars, 3 patients showed MAT perimitral, and 1 patient showed CTI-dependent AT. In the second type of AT, 3 patients showed localized ATs related to scars, 4 patients showed MAT, and 1 patient showed focal AT-related scars. Four patients had the third AT, 1 had localized ATs, 2 had RMAT and 1 had focal AT.