Methods:
We retrospectively recruited non-valvular AF (NVAF) patients with mildly impaired renal function admitted for catheter ablation and readmitted due to recurrence of AF. The estimated glomerular filtration rate (eGFR) was calculated before the index procedure and during readmission. eGFR was defined as the difference between eGFRreadmission and eGFRbaseline. The same calculation applied for CHA2DS2-VASc score. The primary endpoint was improved renal function ( eGFR > 0) after AF catheter ablation in patients with atrial arrhythmia recurrence.