Patient selection
We conducted a single-center, retrospective cohort study comprised of patients enrolled in an IRB-approved, prospectively populated clinical database of AF ablation patients. The included study patients were at least 75 years of age and underwent their index AF ablation using either RF or CB ablation technique at our center between January 2010 and March 2019. The demographics, clinical history, procedural data, complications, and outcomes were recorded for each case. Patients were excluded if they had prior CA of AF, LA thrombus detected on pre-procedural transesophageal echocardiography (TEE) or computed tomography (CT) scan, and advanced comorbidities and frailty precluding CA.