2.4 Definitions
Paroxysmal AF was defined as AF which self-terminates within seven days, and non-paroxysmal AF as AF lasting for more than seven days or requiring direct-current cardioversion for termination. In the current study, atrial tachyarrhythmia consisted of both AF and atrial tachycardia. Late recurrence was defined as any atrial tachyarrhythmia lasting for more than 30 seconds 90 days after RFCA. A single strip (10 seconds) of 12-lead surface electrocardiography showing atrial tachyarrhythmia was also classified as recurrence. Routine Holter monitoring was performed three, six, nine, and 12 months after RFCA. Additional Holter monitoring and portable event recorder evaluation were done whenever needed.