SIGNIFICANCE OF THE STUDY: Acute myocardial infarction (AMI) is a major cause of death. Most of the deaths from AMI, if diagnosed and treated early enough, can be prevented. Delay in treatment may cause unnecessary exacerbation of the disease and even death in AMI patients. PURPOSE OF THE STUDY: A retrospective survey was conducted to (1) investigate the delay time in AMI patients' seeking treatment from symptom onset to arrival at the first hospital (overall pre-hospital delay), the length of time taken for decision-making (patients' delay) and transport (transportation time); (2) to identify factors associated with delay times; (3) to compare delay times between the group who called 119 and the group who did not. RESULTS: The mean of overall pre-hospital delay time was 17.42 (+/-24.03) hours and it was consisted of patients' delay, 17.07(+/-24.45), and transportation time, .84 (+/-2.34). None of socio-demographic variables such as age, sex, marital status, monthly income, education, and living environment was associated with either the patients' delay or the overall delay time. Living rural area (F=4.483, p=.016), having previous MI (F=35.252, p=.000), and other heart disease (F=69.435, p=.000) decreased transportation time; having previous heart disease decreased overall pre-hospital delay(F=4.489, p=.039); and having angina (F=92.907, p=.000) and CAD (F=9.724, p=.003) increased transportation time. Place of symptom attack, bystander, whether patients or bystander called 119, modes of transportation, intensity of pain, presence of typical chest pain and anxiety perceived by patients were not associated with any of delay times. No significant differences appeared between the group who called 119 and the group who did not in any of delay times. CONCLUSION AND SUGGESTIONS: Although number of patients who arrive at the hospital early enough for treatment tend to be increasing, considerable number of patients still delayed longer than desired when they experienced symptoms of AMI, and calling 119 did not diminish this delay because patients delayed mostly before they decided to call. Living urban area, having previous MI, and heart disease decreased transportation time whereas having previous heart disease decreased the overall pre-hospital delay time and having previous angina and CAD increased transportation time. Further studies to identify reasons for real late arrivals as well as public campaigns to reduce delay time in treatment are needed.