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. ).