Heart Rate and Cardiovascular Outcomes in Post-Myocardial Infarction Patients Treated by β-Blockers: A Secondary Analysis of the ABYSS Trial.

Higher heart rates above 50 bpm in stable post-myocardial infarction patients are linked to increased adverse cardiovascular events and mortality, even in the modern reperfusion era.

• Why it matters: Understanding the prognostic significance of heart rate after MI is crucial for optimizing treatment strategies, especially as the relevance of HR in the era of reperfusion therapy remains unclear.
• What they did: The study analyzed 3,698 stable post-MI patients with preserved ejection fraction from the ABYSS trial, examining the effects of baseline HR and β-blocker interruption on cardiovascular outcomes.
• The result: Findings show that interrupting β-blockers raises HR and worsens outcomes regardless of initial HR, emphasizing the importance of continuing β-blocker therapy to improve prognosis.