Effects of Intracoronary Stem Cell Transplantation in Patients With Dilated Cardiomyopathy

Background: We investigated clinical effects of intracoronary transplantation of CD34+ cells in patients with dilated cardiomyopathy (DCM). Methods: Of 55 patients with DCM, 28 were randomized to CD34+ transplantation (SC group), and 27 patients did not receive stem cell therapy (controls). In the SC group, peripheral blood CD34+ cells were mobilized by granulocyte-colony stimulating factor and collected via apheresis. Patients underwent myocardial scintigraphy and CD34+ cells were injected in the coronary artery supplying the segments with reduced viability. Results: At baseline, the 2 groups did not differ in age, gender, left ventricular ejection fraction (LVEF), or NT-proBNP levels. At I year, stem cell therapy was associated with an increase in LVEF (from 25.5 11 +/- 7.5% to 30.1 +/- 6.7%; P = .03), an increase in 6-minute walk distance (from 359 +/- 104 m to 485 +/- 127 m; P = .001), and a decrease in NT-proBNP (from 2069 +/- 1996 pg/mL to 1037 +/- 950 pg/mL; P = .01). The secondary endpoint of 1-year mortality or heart transplantation was lower in patients receiving SC therapy (2/28, 7%) than in controls (8/27, 30%) (P = .03), and SC therapy was the only independent predictor of outcome on multivariable analysis (P = .04). Conclusions: Intracoronary stem cell transplantation could lead to improved ventricular remodeling, better exercise tolerance and potentially improved survival in patients with DCM. (J Cardiac Fail 2011:17:272-281)