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After myocardial infarction (MI) the risk of sudden cardiac death due to arrhythmias is substantial.

The purpose of this study was to investigate if new-onset atrial fibrillation (AF) is associated with development of potential malignant brady- and tachyarrhythmias after an acute MI.

The study included 277 post-MI patients from the CARISMA study with left ventricular ejection fraction ≤40%, New York Heart Association class I, II, or III and no history of AF. All patients were implanted with an implantable cardiac monitor within 4 to 27 days after an acute MI and followed every 3 months for 2 years. Time-dependent association between new-onset AF >30 s and the development of bradyarrhythmias and/or ventricular tachyarrhythmias were investigated using Cox proportional hazard regressions.

New-onset AF was associated with an increased risk of bradyarrhythmias when adjusting for …