title: Comparative experimental study between L-Hydro treated pulmonary homograft and fresh pulmonary homograft.
abstract: OBJECTIVE
  In an effort to make available homografts preserved in a simpler and less costly way, we evaluated the polyethyleneglycol, L-Hydro (LH) method, that consists in the controlled extraction of antigenic substances and the incorporation of anti-inflammatory and anti-thrombotic agent.
  
  
  METHODS
  We substituted the pulmonary trunk in ten ovines, seven received LH treated pulmonary homografts and three, fresh pulmonary homografts, orthotopically implanted and followed-up for 320 days. Ovines where evaluated by means of laboratory tests, echocardiographic exams. At the 320 days, were euthanized, hemodynamic, radiology, macroscopic, optic/electronic microscopic, scanning/transmission evaluations were performed. Results were analyzed by Student t test of independent samples for continuous data, by variance analysis of repeated measures, and by Fisher exact test for categorical data.
  
  
  RESULTS
  We couldn't establish relevant differences in clinical evolution and laboratory tests between groups. Echocardiogram revealed difference in pulmonary medium gradient, which was significant 10 months follow-up, higher in the control group. Radiologic and macroscopic evaluations didn't established differences. In the optic/electronic microscopic evaluation, liner and interstitial cells were equally found in both groups. The cell liner percent calculated in both groups was similar. Cellularity nodules were observed only infresh homograft group.
  
  
  CONCLUSIONS
  These data indicate that both groups presented similar clinical/hemodynamic performances. The LH group's echocardiogram presented a better performance. It also presented histological evidences of interstitial and endothelial cell repopulation. In the macro/optic and electronic microscopic analysis, group L-H presented macroscopy/histological structure and ultra-structural similar to the fresh group, with the exception of nodules with higher interstitial cellularity, present only in the fresh homograft group.
authors: University of São Paulo Faculty of Medicine, São Paulo, SP, Brazil. neiarey@yahoo.com
authors: Nei Antônio
authors: NA
authors: Rey
authors: Luiz Felipe Pinho
authors: LF
authors: Moreira
authors: David T
authors: DT
authors: Cheung
authors: Ivan Sérgio Joviano
authors: IS
authors: Casagrande
authors: Luiz Alberto
authors: LA
authors: Benvenuti
authors: Noedir Antonio Groppo
authors: NA
authors: Stolf
mesh_terms: D000818:Animals; D015925:Cryopreservation; D004452:Echocardiography; D006439:Hemodynamics; D011092:Polyethylene Glycols; D011664:Pulmonary Valve / Q000473:pathology / Q000637:transplantation* / Q000648:ultrastructure; D012756:Sheep; D014021:Tissue Preservation / Q000379:methods*; D014184:Transplantation, Homologous
chemical_list: D011092:Polyethylene Glycols