Fig. 1.

Histogram of AF burden, episode duration and frequency with quartiles (Q1-Q4) outlined. The figure demonstrates a histogram of the AF characteristics for the whole study population of 150 patients, with the quartiles outlined. In 52 patients the median duration of AF episodes was 6 min (Q1) and hence Q2 included 23 patients, Q3 included 23 patients and Q4 included 25 patients. In both AF burden and frequency, Q1, Q2 and Q3 included 36 patients while Q4 included 35 patients. AF = Atrial fibrillation; AF burden = % of time spent in AF;