L-Hydro treated homologous pulmonary graft vs. pulmonary homograft fresco: an experimental, comparative study / Estudo experimental comparativo do enxerto homólogo pulmonar tratado pelo processo L-Hydro com o homoenxerto pulmonar a fresco

AUTOR(ES)
DATA DE PUBLICAÇÃO

2008

RESUMO

Valve substitutes are highly important in account of their frequent use and since the success of a surgical procedure depends on their good performance. A variety of valve substitutes have been used, all presenting complications pertaining to their materials, such as thrombosis, calcification, degeneration, sterilization difficulties, cost, production complexity, etc. In an effort to make available homografts preserved in a simpler and less costly way, we evaluated a new preservation form using polyethyleneglycol, the LHydro method. This method consists in the controlled extraction of antigenic substances and the incorporation of an anti-inflammatory and anti-thrombotic agent. We substituted the pulmonary trunk in ten ovines, seven received LHydro treated pulmonary homografts and three received pulmonary homografts fresco, orthotopically implanted and followed-up for 320 days. Ovines where evaluated by means of laboratory tests and echocardiographic exams. At the end of the 320 days, they were euthanized, and hemodynamic, radiology, macroscopic, optic and electronic microscopic, scanning and 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 Fischer exact test for categorical data. We couldnt establish relevant differences in clinical evolution and laboratory tests between both groups. Echocardiogram revealed a difference in the pulmonary medium gradient, which was significant at the 10 months followup, higher in the control group than in the L-Hydro group. Radiologic and macroscopic evaluations didnt established differences. In the optic and 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 in the homograft fresco group. In conclusion, these data indicate that both groups presented similar clinical and hemodynamic performances. The L-Hydro groups echocardiogram presented a better performance. It also presented histological evidences of interstitial and endothelial cell repopulation. In the macro and optic and electronic microscopic analysis, group L-Hydro presented macroscopy, histological structure and ultra-structural similar to the homograft fresco group, with the exception of nodules with higher interstitial cellularity, present only in the homograft fresco group.

ASSUNTO(S)

ovinos polyethylene glycols transplante homólogo polietilenoglicóis transplantation homologous valvas cardíacas sheep heart valves

ACESSO AO ARTIGO

Documentos Relacionados