The results of primary percutane coronary angioplasty in acute myocardial infarction were studied and compared to international standards. We tried to develop new quality indicators for objective comparison. Seventy nine patients with acute myocardial infarction were included in the study, 47 of them from the pre-stent, and 32 from the stent era. The primary success rate was 91.5 and 81 per cent, respectively. Six months event free period was achieved in 74 and in 69 per cent. The mortality reduced from 10.6 per cent to 3.1 per cent. No emergency by-pass operation was needed in the stent group.