Risk stratificaion for sudden cardiac death in postmyocardial infarction(PMI) patients is essential for the successful prophylactic therapy. Noninvasive risk stratification is one of important methods used. It is our presumption that arrhythmic events occur lesser in Korean PMI patients than the Caucasian. We have no available Korean data in the era of primary prevention of sudden cardiac death in myocardial infarction patients. Methods: This retrospective study include 152 unselected postMI survivors(male 124, 60짹11 years) who underwent SAECG, echocardiographic examination and Holter ECG before discharge. The incidence of noninvasive risk markers, including the presence of abnormal SAECG, PVC counts(>10/hr), nonsustained VT(VT) and LV ejection fraction, were studied. Mean follow-up period was 19.4 months. The arrhythmic adverse events were defined as the occurrence of ventricular tachycardia, ventricular fibrillation and/or sudden cardiac death. Results: Percentage of patients who have abnormal SAECG was 15.8%(24/151). Patients who has more than 10 PVCs/hour on Holer ECG was 14.8%(17/115) and NSVT 3.5%(4/115). Patients who have lower LVEF(<45%) was 52.6%(70/133). The arrhythmic adverse events were occurred in 6.6%(10/152) during 19.4 months follow-up period. The incidence of arrhythmic events were lower compared with those of Caucasian study. Of the 24 patients who showed abnormal SAECG, 5 suffered from arrhythmic events(20.8%). Arrhythmic events occurred in 2/17(11.8%), 6/70(8.6%) patients who has frequent(>10/hr) PVCs and lower LVEF(<45%) respectively(p=0.01) Conclusion : The incidence of risk markers were comparable to those of Caucasian, but arrhythmic adverse events occurred less frequently in Korean PMI patients. This might explain our presumption.