Wellens' syndrome: recognizing the risks Summary Acute myocardial infarction is the leading cause of death worldwide.Dedicated management guidelines indicate urgent invasive study in cases of infarction with ST elevation or new left bundle branch block.Electrocardiographic patterns when present in the clinical setting of unstable angina or myocardial infarction predict the presence of severe coronary disease that can lead to death.The recognition of these patterns is very important to take management decisions.A description of Wellens' syndrome as part of these high-risk predictors is offered.