Limitations:
Our study has several limitations. First, this is a retrospective study that does not consider the implication of LAA ostial changes on clinical outcomes. Therefore, we are currently following our patients’ s cohort prospectively to assess for stroke incidence and rates of other complications. Second, only 37 patients in the cohort underwent post-ablation CMR studies and were thus used to calculate changes in LAA ostial size following catheter ablation. However, the reduction in ostial size was nevertheless significant in this subgroup.