Coronary angiograms will be obtained with the aim of facilitating angiographic analyses (long acquisition without magnification). All CDs of primary PCI will be sent to the coordinator center where they will be processed by extrapolating the images regarding baseline, thrombus aspiration, diver reintroduction in the culprit lesion beyond the occlusion site and the post-PCI view. The core laboratory for centralized, blind analyses will be the Catholic University of Rome. For each patient coronary angiograms will be analyzed to assess the following: