Background: There is a paucity of Canadian studies using patient-level data to analyze the costs of catheter ablation (CA) for atrial fi brillation (AF). We sought to identify the health care resource use, costs, and cost predictors of CA. Methods: A cost analysis was performed in a population of AF patients treated with CA in Central Zone Nova Scotia from 2010 to 2018. Costs were compared 2 years before ablation (pre-CA) with costs 2 years