Retrospective observational study, multicenter. The study population will consist of 20 cases of PCI per center (then about 400 PCI in total) selected randomly within the center of the case studies in the previous approval of the study. Of these 16 will be patients with stable coronary artery disease (including 8 with diabetes mellitus in medical therapy) and 4 will be patients with NSTE-ACS (4: 1 ratio).