Follow-up
All patients were evaluated at the clinic every 1-3 months using a 12-lead ECG, 24-h Holter monitor, and portable electrocardiograph when patients complained of palpitations; thereafter, they were followed-up annually. Patients whose symptoms recurred were evaluated immediately. Recurrence of tachycardia and complications after CA were confirmed by outpatient medical records, event monitors, and follow-up via telephone. Recurrence was defined as sustained AT or AF lasting over 1 min.