Temporal changes of noninvasive electrocardiographic risk factors for sudden cardiac death in post‐myocardial infarction patients with preserved ejection fraction: Insights from the PRESERVE‐EF study

Background Several noninvasive risk factors (NIRFs) have been proposed for sudden cardiac death risk stratification in post‐myocardial infarction (post‐MI) patients with preserved ejection fraction (EF). However, it remains unclear if these factors change over time. Methods We evaluated seven electrocardiographic NIRFs as they were described in the PRESERVE‐EF trial in 80 post‐MI patients with EF ≥ 40%, at least 40 days after revascularization...