This article summarizes the findings contained in the 2005 registry of the Spanish Society of Cardiology Working Group on Cardiac Catheterization and Interventional Cardiology. Data were obtained from 128 centers, which comprise almost all cardiac catheterization laboratories in Spain. Of these, 118 performed catheterizations mainly in adults, while 10 carried out procedures in only pediatric patients. In 2005, 117,245 diagnostic catheterization procedures were performed, including 103,646 coronary angiograms, which was 5.9% more than in 2004. The population-adjusted rate was 2326 coronary angiograms per million inhabitants. A total of 51,689 coronary interventions were performed, which is 13.6% more than in 2004 and which corresponds to a rate of 1161 per million inhabitants. Coronary stents were used in 96% of procedures. Of the 80,569 stents implanted, 41,352 (51.3%) were drugeluting stents. Some 8341 percutaneous coronary interventions were carried out in patients with acute myocardial infarction, which is 13.8% more than in 2004. They accounted for 16.1% of all such interventions. Among the non-coronary interventions recorded, the number of percutaneous mitral valvuloplasties decreased by 7%. The number of procedures carried out to close atrial septal defects increased by 40% compared with 2004. The number of pediatric interventions increased by 1.7%. Finally, it is important to note that a large proportion of laboratories reported results, which helped to ensure that the data summarized here are highly representative of the work carried out at cardiac catheterization laboratories in Spain.