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Introduction: Previous data have shown that about 25% of pts receiving CRT have atrial fibrillation (AF) but AF pts have been underrepresented in randomized CRT trials. The ESC/EHRA CRT Survey II collected data on current CRT implantation practice in 42 European countries. This analysis focuses on CRT implantation practice with regard to the presence of AF. Methods and Results: Between October 2015 and January 2017, 11.088 patients (pts) with an initial implant or upgrade from a previous device were included in the Survey. We analyzed 10843 pts with available data on AF presence. Overall, 4582 pts (42.2%) had AF. Permanent AF was present in 1889 pts. (42.4% of all AF pts), persistent AF in 994 (22.3%) and paroxysmal AF in 1548 pts (34.7%). AF pts. were older, had more advanced HF stage and more co-morbidities than pts. without AF (see table). There were also differences with regard to pacemaker dependency, CRT indication and device type implanted. Perioperative bleeding occurred slightly more often in AF pts. (1.3 vs. 0.8%, p=0.002) but the overall complication rate was not increased (5.2 vs. 5.8%, p=n.s.). Adverse events until discharge were more frequent in AF pts (5.4 vs. 4.3%, p=0.01), mostly due to increases in infections, worsening renal function and arrhythmias, but did not more often necessitate re-intervention (4.0 vs. 4.1%). Conclusion: The percentage of pts currently receiving CRT with concomitant AF is higher than previously reported. AF pts are older and sicker than pts receiving CRT without AF. Assuming a worse prognosis in the AF population, there is need for more prospective data on these pts. [ABSTRACT FROM AUTHOR]