CFTR and atrial fibrillation: Therefore, index and repeat ablation procedures as well as ablation within healthy compared to impaired myocardium need to be distinguished when evaluating LI and CF dynamics: In our analysis, baseline LI was lower compared to previous results on index AF procedures, but LI correlated better with ∆LI compared to CF which is in line with published data (Szegedi et al., 2021; Ikenouchi et al., 2022; Solimene et al., 2022; Yasumoto et al., 2022).