Does new atrial fibrillation increase mortality in patients with myocardial infarction?
New-onset atrial fibrillation during a myocardial infarction is a severe event independently associated with increased mortality.
Atrial fibrillation is associated with increased risk of mortality in MI patients. New AF with no history of AF before MI remained associated with an increased risk of mortality even after adjustment for several important AF risk factors. These subsequent increases in mortality suggest that AF can no longer be considered a nonsevere event during MI.
Jabre et al. (2011) studied this question.