Prompt treatment of initial acute rejection episodes may improve long-term graft outcome

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Abstract
Acute rejection episodes have been cited as a major immunological risk factor for the development of chronic rejection. To examine the influence of a single rejection event on ultimate graft outcome, acutely rejection rat kidney grafts were retransplanted sequentially into syngeneic rats and their functional and structural behavior assessed over time Early structural changes (days 3 and 4) were completely reversible, while signs of chronic rejection did become obvious during the long-term follow up. More advanced deteriorated grafts (days 5 and 7) were irreversibly damaged and the rats died shortly after retransplantation. Those results indicate the critical impact of acute rejection episodes on chronic graft rejection. Immediate and aggressive treatment of acute rejection episodes may remove this event as a risk factor for late deteriorating changes.

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