Background:
Newer pacemakers have data storage capabilities that permit detection of multiple episodes of atrial fibrillations (AF). The aim of the study was to document frequency, time to first AF detection after implantation, risk factors for symptomatic episodes and to determine the prevalence and predictors of pacemaker-detected AF

Material and methods:
Patients (n=62) implanted pacemaker automatically recorded the cumulative daily AF burden were included in the analysis. Diagnostic information with AF burden measurements was collected and presence of symptoms was noted at every follow-up visit. In every one pts confirmation of AF with intracardiac electrocardiogram (IEGM).

Results:
During 12 months follow up AF was detected by the pacemaker in 11 of 61 (18%) patients – in 5pts with SSS and in 6 with AVblock. The average time to detection of AF episodes was 2.3 ± 4.3 months from the beginning of the follow-up. Majority of AT/AF burden was detected after 3 months - in 5 (45%) out of 11 patients. Next 4 cases (36%) of AT/AF burden were detected at 6 month follow up. Multivariate analysis showed that clinical factors was statistically nonsignificant, as risk factors for AF. In every one pts with AF detected high CHA2DS2-VASc score was ≥3 was found.

Conclusions:
Pacemaker-detection of AF is often first paroxysmal atrial tachyarrhythmia diagnosis in asymptomatic patients. This suggest that atrial tachyarrhythmia data, collected from capable pacemakers, which will be frequent reviewed can lead to newly diagnosis and early treatment in that group of patients, which could influence mortality and morbidity.