title: [Experimental study of canine tracheal allotransplantation].
abstract: OBJECTIVE
  To detect the factors relevant to stenosis of tracheal graft and to find feasible methods to solve this problem.
  
  
  METHODS
  Sixteen mongrel dogs were divided into groups A and B randomly and equally. Five-ring-length tracheal segments were allotransplanted. All grafts and anastomotic sites were covered with omental pedicles. In group A, no immunosuppressant was given and in group B, the recipients were treated with cyclosporine. The animals were sacrificed 4 weeks after operation, and their postmortem specimens were examined grossly and histologically. All allografts were assessed by percent patency. Epithelial regeneration and morphology of the cartilage were semiquantitatively evaluated.
  
  
  RESULTS
  Structural integrity of the allografts were maintained better in group B than in group A. Tracheal stenosis was found to be more serious in group A. The scores of epithelial regeneration and cartilage morphology were higher in group B than in group A, and in each group positive correlation was found between the percent patency and the score of epithelial regeneration or cartilage morphology.
  
  
  CONCLUSIONS
  Immunosuppressive drugs are necessary to maintain the structure of allografts. Tracheal stenosis is correlated closely with epithelial regeneration and morphological maintenance of the cartilage.
authors.affiliation: Department of Thoracic Surgery, Tangdu Hospital, Fourth Military Medical University, Xi'an 710038, China.
authors.forename: Tao
authors.initials: T
authors.lastname: Zhang
authors.forename: Xiao-fei
authors.initials: XF
authors.lastname: Li
authors.forename: Dao-xi
authors.initials: DX
authors.lastname: Wang
authors.forename: Qing-shu
authors.initials: QS
authors.lastname: Cheng
authors.forename: Kun
authors.initials: K
authors.lastname: Liu
mesh_terms: D000818:Animals; D004285:Dogs; D007166:Immunosuppressive Agents / Q000494:pharmacology; D008297:Male; D014132:Trachea / Q000473:pathology / Q000637:transplantation*; D014184:Transplantation, Homologous
chemical_list: D007166:Immunosuppressive Agents