Background: Prognosis of the patients with AMI largely depends on the time-delay before revascularization. Time-delays in AMI occur during 3 intervals: from onset of symptoms to patient recognition (SxToMed), during out-of-hospital transport (TransDelay), and during in-hospital evaluation, so called door-to-needle or door-to-balloon time (DtoB). In these days, many hospitals are trying to ���Revascularize��� the patients ���in time���, but the effort to improve the pre-hospital factors is relatively scarce. In this study, we tried to elucidate the importance of pre-hospital delay for the total time delay in AMI patients. Methods: We enrolled 1992 patients from the 8567 patients of 1st KAMIR study. Eligible study subjects were patients who contacted medical system within 12 hours after the onset of symptom, had final diagnosis of ST elevation MI(STEMI) and underwent PCI after admission. Results: Among the 1992 subjects, 1509(75.79%) were male. 893(44.9%), 482(24.2%), 121(6.1%) and 128(6.5%) subjects had hypertension, diabetes, dyslipidemia and family history of ischemic heart disease. We divided these patients into 4 groups according to transfer status and use of ���119 system���: Direct119, DirectNon119, Transfer119 and TransferNon119. The mean and standard error of the time values (min) were presented in Table 1. Majority of the STEMI patients, who were eligible for revascularization, visited primary medical centers which were not able to definitive care (1279/1992,64.2%). This false choice of primary medical center cost the time delay for inter-hospital transfer, whose mean value was 157.9짹4.4 min. Conclusion: Pre-hospital time delay was significant in patients with STEMI, who are eligible for revascularization, in Korea. More efforts are needed to reduce the pre-hospital time delay.