[Xenotransplantation from the ethical viewpoint. An outline].

The duty to save and to preserve lives on one hand, and the scarcity of human donor organs on the other hand call for a search for new organ sources, including xenogenic ones. Xenotransplantation, however, is not only in need of medical research, but also of ethical analysis. The latter is not to be considered a substitute for moral intuition, but rather a foundation of it by way of a critical evaluation of the ethical principles and reasons involved. This basically demands an analysis of the legitimacy of the aims and of the acceptability of the means for xenotransplantation. It includes safeguarding informed consent; risk assessment and the protection of not only the recipient, but also others; the question of limitation of personal rights; allocation problems; and last but not least animal protection. The aim is to clarify the ethical status of xenotransplantation in general and the question of a moratorium regarding clinical trials due to unsolved problems of infectivity and immunosuppression in particular by way of an integrative approach to both scientific developments and ethical analysis.