[Heart transplantation in the dog. One case of survival for 7 years]

A survival of 7 years was obtained in a dog cardiac transplant, treatment having been stopped one year after operation. Morphological study of the graft showed the existence of a fibrous type rejection reaction, involving the vessel walls and the autonomic nervous system areas of the graft, resulting in episodes of ventricular tachycardia. This case shows that a rejection reaction may progress slowly and inexorably for several years whilst long term tolerance of the graft may nevertheless be obtained, perhaps by induction due to transfusion during the operation of blood of the donor to the recipient.