The therapeutic recourse for end-stage heart disease is currently limi
ted to cardiac transplantation. The ability to augment cardiomyocyte n
umber in ali end-stage heart might facilitate myocardial function. Aug
mentation of cardiomyocyte number may be achievable by the targeted ex
pression of cell cycle regulatory genes to the myocardium. Alternative
ly, intracardiac grafting of exogenous cardiomyocytes might also provi
de a viable approach to augment cardiomyocyte number. Potential strate
gies for heart muscle regeneration via gene therapy and cellular trans
plantation are discussed.