Study population
This study included NVAF patients with mildly impaired renal function who were admitted to the First Affiliated Hospital of Nanjing Medical University for AF catheter ablation and readmitted due to recurrence of AF between January 2012 and June 2019. The exclusion criteria were as follows: less than 3 months between the two admissions, and diagnosis of chronic kidney disease before the index AF catheter ablation.
All clinical characteristics before the index procedure and during readmission were collected. The Chronic Kidney Disease Epidemiology Collaboration (CKD-EPI) equation was used to calculate the eGFR to assess renal function.23