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Aims: We have shown that autologous transplant of CD34+-enriched peripheral-blood mononuclear cells (PBMSC) could restore depressed myocardial function, and sustain adequate myocardial function 12 months after surgery in patients with old (>one year-old) myocardial infarction. Our aim is to report the long-term morbidity and mortality efficacy of this procedure. Methods and results: Seventy patients with an old anteroseptal myocardial infarction were followed for 2 to 7 years, 35 had a revascularization procedure and received an intra-myocardial injection of autologous CD34+-enriched PBMSC (8 × 108 mononuclear cells/ml including 3 × 107 CD34+ cells/ml)(Group A). Group B patients only had the revascularization. Abnormal pre-surgical values of LVEF (33.2% ± 4.8%), LVDV (178 ± 13.7 ml), LVSV (120 ± 16 m), LVDD (58.9 ± 3.84 mm), E and A waves without contractility in infarction area in group A patients improved to approximate normal values (50% ± 3% for LVEF; 90 ± 9.3 ml for LVDV; 80 ± 9.9 ml for LVSV; 55.3 ± 3 mm for LVDD; 5.2 ± 0.5 cm/s for E wave and 4.18 ± 0.3 cm/s for A wave) 1 year after the procedure and have remained unaltered for all the follow-up period. All the patients remain alive. Only seven patients have been readmitted to the hospital for non-myocardial related events. Group B only 11 patients continued alive to 5 years after surgery and LEVF never increased more than 6%, all of them with many hospitalizations (n ≥ 10) by heart failure events. Conclusion: Intramyocardial injection of CD34+ highly enriched PBSC represent an encouraging alternative for patients with severely scarred and dysfunctional myocardium

Efficacy and long-term evaluation of intramyocardial injection of autologous CD34-enriched PBMSC in old myocardial infarction