Abstract: AIM:To evaluate the left ventricular long axis systolic displacement in myocardial infarction patients with real-time triplane tissue tracking imaging. METHODS: Fifty-nine patients with myocardial infarction were divided by coronary artery angiography into three groups: group B of 17 patients with single left anterior descending (LAD) coronary artery stenosis, group C of 19 patients with left circumflex coronary artery or/and right coronary artery stenosis and group D of 23 patients with double or triple coronary arteries stenosis with LAD. Twenty-five healthy subjects were selected as group A of normal control group. Systolic atrial ventricular plane displacement (AVPD) and the systolic maximum displacement (Dmax) of left ventricular segmental movement were measured by triplane-TTI. RESULTS: The average AVPD in group B, group C and group D (especially that of group D) decreased significantly compared with that in group A (P<0.05). The AVPD of posterior, inferior and posteroseptal sites in group B and of anteroseptal and anterior sites in group C were not significantly different from those in group A. In group A, the Dmax was the basal segment > the middle segment>the apical segment, with no significant difference in the same level segment. In group B, group C and group D, the Dmax significantly decreased in segments compared with that in group A (all P<0.05). The decrease of AVPD and Dmax was in compliance with the area where infarction coronary blood supplies. CONCLUSION: Evaluation of AVPD in many sites could prevent over- or undervaluation and Dmax could objectively and accurately reflect left ventricular regional systolic functions in patients with myocardial infarction.