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.