title: The use of arterial allografts for vascular reconstruction in patients receiving immunosuppression for organ transplantation.
abstract: OBJECTIVE
  This study was undertaken to assess the biologic behavior of arterial allografts used for vascular reconstruction in patients undergoing immunosuppression therapy because of a previously transplanted organ.
  
  
  METHODS
  Thirteen patients with a transplanted kidney and receiving azathioprine, cyclosporine, and prednisone therapy, received 16 ABO-compatible arterial allografts to treat vascular complications of the kidney transplantation, popliteal aneurysms, and chronic or critical ischemia of the lower extremities. One aortoiliac, one iliorenal, two iliofemoral, three femorofemoral, one femoroperoneal, and eight femoropopliteal grafts were used in this particular group of patients. The arteries were retrieved from a donor whose diagnosis was cerebral death and, after careful preliminary studies, were stored cold, with use of liquid nitroxide vapor.
  
  
  RESULTS
  The patients were monitored up to 45 months, mean 20 months. Graft tolerance was good, there were no signs or symptoms of acute rejection, and there was no perturbation of the immunologic tolerance of the transplanted kidney. During the follow-up period, two grafts occluded. On the basis of the histologic studies, it was not possible to relate the occlusion to rejection.
  
  
  CONCLUSIONS
  This clinical study, undertaken for the first time in human beings, seems to confirm that immunosuppression modifies host tolerance to arterial allografts, improving their biologic behavior, a fact that was already documented in animal experimentation.
authors.affiliation: Santa Maria Hospital, Lisboa, Portugal.
authors.forename: A D
authors.initials: AD
authors.lastname: da Gama
authors.forename: C
authors.initials: C
authors.lastname: Sarmento
authors.forename: T
authors.initials: T
authors.lastname: Vieira
authors.forename: G X
authors.initials: GX
authors.lastname: do Carmo
mesh_terms: D000328:Adult; D000368:Aged; D001157:Arterial Occlusive Diseases / Q000601:surgery*; D001158:Arteries / Q000637:transplantation*; D005260:Female; D006084:Graft Rejection / Q000517:prevention & control; D006801:Humans; D007166:Immunosuppressive Agents / Q000627:therapeutic use*; D016030:Kidney Transplantation / Q000276:immunology*; D008297:Male; D008875:Middle Aged; D014184:Transplantation, Homologous
chemical_list: D007166:Immunosuppressive Agents