Observational, cross-sectional study on 30 patients with STEMI treated with thrombectomy and PCI with stent implantation. Composition and characteristics of the coronary thrombi with respect to cell types, genetic expression and presence of specific markers of inflammation, platelet activity, endothelial activation, coagulation and fibrinolysis will be investigated in relation to the levels of these markers in the general circulation, and specifically related to the time axis from symptom to PCI, as well as to the degree of myocardial necrosis.