With the development of immunosuppressive drugs and technology, heart transplantation has achieved a great success in the treatment of patients with end-stage heart failure or very complicated congenital heart disease. Early results of heart transplantation are satisfacfactory, but the long-term results are not so optimistic. Because all coronary blood vessels will develop myointimal hyperplagia progressively, causing varies degree of luminal stenosis or even complete obstruction, called cardiac allograft v...