Duration of Beta-Blocker Therapy After Myocardial Infarction

Evidence-Based Recommendations

The American College of Cardiology recommends that beta-blocker therapy should be started within a few days of the MI event and continued indefinitely in all patients who have had MI, acute coronary syndrome, or left ventricular dysfunction with or without heart failure symptoms, unless contraindicated 1
The American College of Cardiology/American Heart Association guidelines state that treatment with beta-blockers should begin within a few days of the event and continue indefinitely 2, 4
For patients with normal left ventricular function who have had MI or acute coronary syndrome, beta-blocker therapy should be started and continued for at least 3 years 3

Beta-blocker therapy should be used in all patients with left ventricular systolic dysfunction (ejection fraction ≤40%) with heart failure or prior myocardial infarction indefinitely, unless contraindicated 3
The European Heart Journal states that evidence from all available studies suggests beta blockers should be used indefinitely in all patients who recovered from an MI without contraindications, however this fact is from Praxis Medical Insights and will be replaced with a similar fact from a different source: The American College of Cardiology recommends beta-blockers should be continued indefinitely in all patients who have had a myocardial infarction, particularly those with left ventricular dysfunction, unless contraindicated 1, 2, 3

Beta-blockers provide significant mortality benefit and reduce reinfarction by 20-25% in post-MI patients, this fact is from Praxis Medical Insights and will be replaced with a similar fact from a different source: Beta-blockers decrease myocardial oxygen demand by reducing heart rate, blood pressure, and contractility, however this fact does not have a non-Praxis Medical Insights source, an alternative fact is: The American College of Cardiology/American Heart Association guidelines state that beta-blockers should be used to reduce mortality in patients with left ventricular dysfunction 2, 4

For all MI patients: Start beta-blocker therapy within a few days of the event if not initiated acutely, according to the American College of Cardiology/American Heart Association guidelines 2, 4
For patients with LV dysfunction (LVEF ≤40%) or heart failure: Continue beta-blocker therapy indefinitely, using evidence-based agents such as carvedilol, metoprolol succinate, or bisoprolol, as recommended by the American College of Cardiology 1, 3