Background: N-terminal-proBNP (NT-proBNP) is an useful biomarker in the diagnosis and prediction of the prognosis in patients with heart failure or left ventricular dysfunction. The aim of this study was to evaluate the correlation between NT-proBNP levels and echocardiographic parameters and contributing factors for high NT-proBNP level in post-myocardial infarction (MI) patients. Method: NT-proBNP was measured in patients who visited for the follow up coronary angiography at 6 months after percutaneneous coronary intervention (PCI) associated with myocardial infarction and angina (as a control). Cardiac function was evaluated by echocardiography before PCI and after 6 months. Results; NT-proBNP was higher in patients with MI than angina (177짹198 vs 63짹54 pg/ml, p=0.004). NT-proBNP was correlated with left ventricular ejection fraction (LVEF) (r=-.436, p<0.001), wall motion score index (WMSI) (r=.440, p<0.001), left ventricular end-diastolic dimension (LVEDD) (r=.306, p=0.015) and left ventricular end-systolic dimension (LVESD) (r=.394, p=0.001). For the detection of LVEF<50% with NT-proBNP>200 ng/dl, positive predictive and negative predictive values were 57% and 83% respectively. On multivariate regression analysis, age, ST-elevated MI, WMSI and LVEF were associated with NT-proBNP higher than 200 ng/dl. Conclusions: NT-proBNP is a useful biomarker reflecting cardiac function and remodeling parameters in post-MI patients.