Heart failure after myocardial infarction significantly increases mortality risk regardless of ejection fraction, though overall post-MI mortality has declined over time due to improved heart failure survival.
HF markedly increases the risk of death after MI. This excess risk is similar regardless of ejection fraction but greater for delayed- versus early-onset HF. Mortality after MI declined over time, primarily as a result of improved HF survival.
Gerber et al. (Thu,) studied this question.