Giving beta-blockers within 8 hours of presentation with acute coronary syndrome (ACS) does not reduce in-hospital mortality, a meta-analysis has shown.
Beta-blockers reduce cardiac workload and limit ischemic injury, and professional guidelines support their early use in acute or suspected myocardial infarction (MI). The authors of the meta-analysis point out, however, that these agents also have the potential to depress cardiac output to the point of cardiogenic shock.