The location of the touch up sites in the SVCI
Miyazaki et al. reported that conduction gaps were located on the
anterolateral wall of the SVCI in the majority of cases (15). Our study
also revealed that touch up ablation was needed in the anterior and
lateral areas. The median value of the AI in the anterior and lateral
areas was relatively lower than that in the posterior and septal areas.
The ablation of the anterior or lateral area had a potential risk of
sinus node or phrenic nerve complications. As a result of the fact that
the operators worried about these complications, the AI value may have
been lower than that of the other areas. The lower AI value in the
anterior and lateral areas resulted in a higher incidence of touch up
ablation in those areas.