**4.6 Serum creatinine levels**

Our 82-patient study on postprocedural ablation predictors of AF recurrence showed no correlation between serum creatinine levels and AF recurrence after ablation. Watanabe et al. similarly stated that creatinine clearance <50 mL/min was not a predictive factor for AF recurrence. Therefore, serum creatinine level is not a prognostic or predictive factor for AF recurrence.
