shorter HF duration and non-ischemic etiology with reduced myocardial scar may be key to improved cardiac function following catheter ablation. 2 In the study of Yazaki et al, some patients underwent multiple catheter ablations to treat recurrent atrial tachyarrhythmia. 3 The next concern is whether such interventions could also ameliorate cardiac function, as well as clinical outcomes, following recovery to sinus rhythm. DisclosuresT.I. receives grant support from JSPS KAKENHI (No. JP20K17143).

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