TNFSF10 and atrial fibrillation: Then, we assessed the dynamics of changes in concentration of both markers in two subgroups separately and we observed important increase in TRAIL concentration in subgroup with SR return (visit I versus visit II: 94.11 ± 29.46 versus 111.39 ± 30.23 pg/mL; p = 0.002) and no significant changes in the group of AF maintenance (88.49 ± 40.65 versus 83.03 ± 28.25 pg/mL; NS).