The present invention provides a method for repairing damaged myocardium. The method comprises using a combination of cellular cardiomyoplasty and electrostimulation for myogenic predifferentiation of stem cells and to synchronize the contractions of the transplanted cells with the cardiac cells. The method comprises the steps of obtaining stem or myogenic cells from a donor, culturing and electrostimulating the isolated cells in vitro, and implanting the cells into the damaged myocardium.