Influenza infection increases the risk of cardiovascular complications and mortality in patients with heart disease. In patients with coronary artery disease influenza vaccination has been shown to reduce cardiovascular mortality, but high-quality evidence was missing. New trial data from a RCT in patients shortly after myocardial infarction has confirmed the significant reduction of the risk of major adverse cardiovascular events (MACE) and cardiovascular death after influenza vaccination. Also in patients with heart failure the first published RCT in heart failure shows a clinical benefit of influenza vaccination versus placebo during the influenza season, confirming preceding observational studies. Meta-analyses from the study data estimate that after influenza vaccination a risk reduction of MACE of at least 25% is possible in patients with heart disease. The current underutilization of influenza vaccines in heart patients should be addressed because influenza vaccination has proven to be an effective and safe instrument for secondary prevention.
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