CCR2 and myocardial infarction: M2 macrophage‐derived small extracellular vesicles (M2EV) regulated metabolic reprogramming of CC chemokine receptor 2 (CCR2)+ macrophages by delivery of miR‐181b‐5p, which in turn prevented the CCR2+ > CCR2− macrophage imbalance observed after ischemic‐reperfusion (I/R) injury induced myocardial infarction.