The results of the Spanish Registry of Hemodynamic and Interventional Cardiology in 1997 are presented. The Registry collects the activity of 83 centers which constitute all the cardiac catheterization laboratories in Spain. The main activity was adult cardiac catheterization in 75 centers and exclusively pediatric cardiac catheterization in 8. A total of 72,370 diagnostic catheterization procedures, 80% coronary angiographies (57,960; 1,462 per million inhabitants), were performed which represents a 13% total increase compared to 1996. Coronary intervention increased by 23% compared to 1996, for a total number of 18,545 procedures. The ratio of coronary interventions per million inhabitants was 468. Success rates of coronary interventions (91.3%) and complications (3.7%) were similar to those registered in previous years. In the specific field of revascularization devices, there has been a dramatic increase in the use of stents. In 1997, coronary stents were employed in 11,417 cases (a 61% increase compared to 1996) which represents 61.5% of all coronary revascularizations procedures. A total of 14,170 prosthesis were implanted, 72% in a elective way, with a low rate of complications (0.95% subacute closure; 1.45% myocardial infarction and 0.75% mortality). Compared to 1996, directional coronary atherectomy (92 procedures) showed a slight decrease, whereas rotational atherectomy (554 procedures) increased by 49% with double the number of centers performing this technique. As in previous years, a slight decrease (7% compared to 1996) in adult valvuloplasties (559 vs 599) was noted. Pediatric interventional procedures decreased by 17% (465 vs 558 procedures) compared to the 1996 Registry.