Björn R, Nissinen M, Lehto J, et al. - Given that atrial fibrillation (AF) represents a common complication post-cardiac surgery, and more insight is required regarding the long-term AF recurrence and adverse results associated with new-onset atrial fibrillation (NOAF) during the index hospitalization, so, researchers addressed this topic herein by analyzing 529 patients in the bioprosthetic and 253 patients in the mechanical valve prosthesis cohort in this study population of patients who had isolated surgical aortic valve replacement (SAVR) at the four participating hospitals (2002–2014). They found a 2–4-fold risk of later AF as well as 1.6–2.0-fold risk of all-cause mortality, after both mechanical and bioprosthetic SAVR, in relation to NOAF during the index hospitalization.