The effect of discontinuing long-term beta-blockers following acute myocardial infarction in optimally treated, stable patients without heart failure - a Danish, nationwide cohort study

Abstract

Abstract Aims We studied the effect of discontinuing beta-blockers following myocardial infarction in optimally treated, stable patients without heart failure. Methods and results Using nationwide registers, we identified first-time myocardial infarction patients treated with beta-blockers following percutaneous coronary intervention or coronary angiography. The analysis was based on landmarks selected as 1, 2, 3, 4, and 5 years after the first redeemed beta-blocker prescription date. The outcomes included all-cause death, cardiovascular death, recurrent myocardial infarction, and a composite outcome of cardiovascular events and procedures. We used logistic regression and reported standardized absolute 5-year risks and risk differences at each landmark year. Among 21,220 first-time myocardial infarction patients, beta-blocker discontinuation was not associated with an increased risk of all-cause death, cardiovascular death, or recurrent myocardial infarction compared with patients continuing beta-blockers (landmark year 5; absolute risk difference [95% confidence interval]), correspondingly; -4.19% [-8.95%; 0.57%], -1.18% [-4.11%; 1.75%], and -0.37% [-4.56%; 3.82%]). Further, beta-blocker discontinuation within two years after myocardial infarction was associated with increased risk of the composite outcome but there was no risk difference associated with discontinuation hereafter. Conclusion Discontinuation of beta-blockers one year or later after myocardial infarction without heart failure was not associated with increased serious adverse events.