Karapet Davtyan1, Akop Brutian1,

1National Research Centre for Therapy and Preventive Medicine, Moscow, Russia

Early arrhythmia recurrences after pulmonary vein (PV) radiofrequency ablation (RFA) are due non-homogenous tissue lesion and therefore 90 day blanking period is recommended. Data are limited on appropriate blanking period after PV cryoballoon ablation.

to evaluate the duration of blanking period for PV CBA using loop recorder data.

We conducted a continuous cardiac rhythm monitoring in 100 patients (52 males, Median age 59) with drug resistant paroxysmal (n=89) and persistent (n11) atrial fibrillation (AF) after PV CBA using second generation cryoballoon. The duration of follow up was 12 months with scheduled visits at 3, 6 and 12 months.

Patient’s compliance rate to follow up was 99%. AF relapse in blanking period was observed in 31 patients: in all patients AF recurrence happened before 45-th day. 26 patients from 31 (83,8 %) with earlier arrhythmia recurrence have had AF episodes during entire 12-month follow up (HR 1.86;CI 0.83-4.17).

Early recurrences after PV CBA are associated with ablation procedure failure.