Statistical analysis
Continuous variables are expressed as the mean±SD or median and interquartile range (IQR) if nonnormally distributed. Categorial variables are presented as numbers (percentages). eGFR at baseline and after readmission were compared using paired t tests. Comparisons of the changes in eGFR between recurrent arrhythmia groups were tested by one-way ANOVA. A Cox regression was used to identify possible factors predicting an improvement in eGFR after AF catheter ablation in patients with atrial arrhythmia recurrence. The duration between the two admissions was used as the time scale in the Cox model. Variables with aP value < 0.05 in the univariate analysis and age were included in the multivariate model. All data were analyzed by SPSS Statistics version 25.0 (IBM Corp. in Armonk, NY. ).