Patients with a history of coronary artery bypass are excluded. The series will consist of patients in whom the procedure was carried out in the previous year to a declaration of participation in the survey and in any case after the publication of the document. There have been no previous analysis of this type in Italy and is therefore not known what is the rate of inappropriateness for PCI procedures in stable patients. It is not possible therefore to perform a calculation of sample size. However, the investigators believes that for a pilot analysis, an initial sample of 400 PCI procedures, analytically considered, is sufficient to verify the magnitude of the problem in the Italian Catheterization Laboratories.