Inclusion Criteria:  Patients with persistent, long persistent or paroxysmal AF undergone AF cryoablation from 2016 onwards Age >18 Patient does not meet exclusion criteria -  Exclusion Criteria:  Patients whose records cannot be obtained Patients with persistent, long persistent or paroxysmal AF undergone AF ablation prior to 2016 Patients with no documented ECG in sinus rhythm prior to ablation Patients not undergoing cryoablation for AF -