New-onset atrial fibrillation may be a more important predictor of cardiac mortality in acute myocardial infarction patients than preexisting atrial fibrillation. (6th May 2015) - Morishima, Itsuro; Tomomatsu, Toshiro; Okumura, Kenji; Sone, Takahito; Tsuboi, Hideyuki; Morita, Yasuhiro; Inoue, Yosuke; Yoshida, Ruka; Yura, Yoshimitsu; Murohara, Toyoaki