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The Journal of Thoracic and Cardiovascular Surgery, Vol 103, 671-677, Copyright © 1992 by The American Association for Thoracic Surgery and The Western Thoracic Surgical Association

ARTICLES

Qualitative microscopy of implanted vein grafts. Effects of graft integrity on morphologic fate

WC Quist, CC Haudenschild and FW LoGerfo
Division of Vascular Surgery, Harvard Medical School, New England Deaconess Hospital, Boston, Mass. 02215.

This is an investigation of the relationship between graft preparation techniques and the subsequent fate of vein grafts. Vein grafts intentionally injured by warm saline storage demonstrated endothelial and smooth muscle cell damage. In the acute postimplantation period, platelet adhesion/activation and white cell infiltration were present. By 7 days the endothelium had "healed," but the underlying smooth muscle cells had modulated and were of the synthetic phenotype. This persisted at 30 days, but by 60 days the graft wall remodeled with smooth muscle cells that were of the contractile phenotype, with an organized extracellular matrix. None of these injurious responses were noted in optimally prepared papaverine-treated vein grafts. Optimal preparation of vein grafts is effective in minimizing endothelial and smooth muscle cell injury before and after arterial reconstruction. Prevention of vein graft injury during harvesting prevents the morphologic changes characteristic of the "arterialization response."

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