[Aortic valve replacement with homografts. An overview]

Abstract

The implantation of fresh or cryopreserved human heart valves (homografts) in aortic position is a tool in cardiac surgery since 30 years. Homografts are attractive alternatives to the implantation of mechanical or xenobiological prostheses, because anticoagulation can be avoided and a near normal anatomy can be restored. Physicians should know about the several kinds of grafts and operative techniques to adequately take care of the patients in follow-up. This overview on the literature covers methods of harvesting, preparation and conservation of homografts according to standard protocols of the European Homograft Bank in Brussels. Their use in the therapy of human valvular disease is discussed with special emphasis to operative techniques (subcoronary, root) and the Ross procedure and in pediatric surgery. Complications and aspects of postoperative care are discussed including immunologic phenomena. Homografts are useful tools for aortic valve replacement, especially in juveniles, in the presence of contraindications for anticoagulation and in endocarditis. Whereas aortic homografts have excellent long-term results, pulmonic homografts show a significant rate of malfunction. Further studies should be performed to clarify the role of the Ross operation or stentless xenografts compared to homografts in aortic position. In pediatric cardiac surgery homografts are of value especially for the reconstruction of the right ventricular outflow tract. Homografts in mitral position show disappointing results up to now. The major limitation in the use of homografts is the mismatch of availability and request, therefore homografts can only be used for the above mentioned special indications.