BACKGROUND: With recent advances in technology and experience, the primary success rate of percutaneous coronary intervention (PCI) of chronic total occlusion (CTO) is much improved. In the several reports, patients with failed recanalization of CTO had significantly worse overall and cardiac survival. OBJECTIVES: The aim of this study is to review the outcomes of PCI of CTO in Dongsan medical center. METHODS: Since January 2002 to December 2003, 79 patients (male 42, 55.7%) with CTO intervention were analyzed. Patients with totally occluded coronary artery were included if the event causative for the occlusion occurred at least 3 months earlier, and excluded with acute myocardial infarction. RESULTS: The patient���s age was 61.8 짹 8.8 years. Diabetes was in 26.6%, hypertension in 50.6%, hypercholesterolemia in 27.8%, smoking in 49.4%. 77 (97.5%) patients were tried coronary intervention, and 64 (81%) patients were successfully recanalized. In the success cases, Judkin guiding catheter was used in 67.1%, Ampulatz in 17.7%, XB in 15.2%. Implanted stent size ��� 3.00mm was in 69.4%. Stent length ��� 20mm was in 69.4%. Clinical follow-up data was available in 74 patients (93.7%). Recurrent angina developed in 10 patients (12.7%). At 6 month follow-up angiogram was done in 31 patients (40.3%), angiographic restenosis (diameter stenosis ��� 50%) in 12 patients (38.7%). Among the 12 patients, 7 patients underwent repeat PCI, 2 patients were done bypass surgery and 3 patients changed medication. 1 patient with failed PCI underwent emergency bypass surgery but died several days later. CONCLUSIONS: In our data, Immediate success rate of PCI of CTO was high (81%). But, relatively high angiographic restenosis rate (38.7%) was shown.