Objectives The aim of this study was to use an 'one-stop' non-invasive imaging examination-MRI to evaluate the feasibility and safety of aBM-MNC transplantation in patients with acute myocardial infarction (AMI) undergoing percutaneous coronary intervention. Methods We did a randomised, double-blind, placebo-controlled study in 60 patients (male=43, female=17, age 52.18±4.98 years) with AMI. The patients were randomly divided into 2 groups (group A: PCI+ aBM-MNC, group B: PCI only).

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... global left ventricular functions and scar tissue were measured by MRI. The therapeutic effects were assessed by MRI 6-month after aBM-MNC transplantation. Results ALL the patients were treated without major complications. There is no evidence of new ventricular arrhythmia or neoplasia. The LVEF was improved 28.5% in group A, while 18.4% in group B ( p<0.01), LVEDV/m2 and LVESV/m2 were decreased by 21.15±3.96 ml/m 2 and 27.14±4.48, respectively, which were significantly different from that in group B (5.85±6.18 ml ( p=0.08) and 9.18±4.84 ( p=0.04)). The cardiac output (CO), cardiac index (CI) and cardiac mass (CM) didn't show significant difference between the two groups. Compared with group B, aBM-MNC group was associated with no significant reduction in myocardial infarct size (15.3% vs 12.7%, p=0.51). Conclusions Comprehensive in vivo CMR reveals reversed remodelling and improved systolic function and scar characteristics after aBM-MNC transplantation. PCI+aBM-MNC transplantation can lead to comparable improvements of left ventricle in acute myocardial infraction. E172 Heart 2012;98(Suppl 2): E1-E319