The use of biomarkers such as a persistently low peripheral blood eosinophil count post-MI may therefore provide a means to direct IL-4 therapy to patients who might gain the most benefit from it.PerspectivesCOMPETENCY IN MEDICAL KNOWLEDGE: Formation of a stable scar and resolution of inflammation are central features of successful infarct repair following myocardial infarction. This evidence concerns the gene IL4 and myocardial infarction.