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Related Experiment Videos

Venous allografts for vascular reconstructions.

F Vermassen1, N Degrieck, L De Kock

  • 1Department of Vascular Surgery, University Hospital Ghent, Belgium.

The Journal of Cardiovascular Surgery
|November 1, 1992
PubMed
Summary

Evaluating venous allograft preservation methods in dogs revealed that cryopreservation in Hanks-solution with DMSO yielded the best results. However, allografts did not outperform synthetic grafts, suggesting limited use for venous allografts without further research.

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Area of Science:

  • Vascular Surgery
  • Biomaterials Science
  • Immunology

Background:

  • Venous allografts are crucial for arterial reconstruction but their long-term patency is limited by preservation methods and rejection.
  • Various preservation techniques, including synthetic grafts, fresh venous grafts, and preserved veins, were compared to assess their efficacy.

Purpose of the Study:

  • To evaluate the 6-month patency rates of different venous allograft preservation protocols.
  • To compare the performance of preserved venous allografts with synthetic grafts and fresh autografts.

Main Methods:

  • 162 arterial reconstructions were performed in mongrel dogs using various graft types and preservation methods.
  • Grafts included synthetic (Dacron, PTFE), fresh venous (autografts, allografts), and preserved venous grafts (saline, glutaraldehyde, Hanks-solution with DMSO).

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  • Patency was assessed weekly via palpation and regular angiography over 6 months.

    • Main Results:

    • Fresh venous autografts showed 100% patency, while fresh allografts had 37% patency.
    • Cryopreservation in Hanks-solution with 15% DMSO yielded the highest allograft patency (35%) among preserved veins.
    • Synthetic grafts (Dacron 48%, PTFE 53%) and some preserved allografts had comparable or superior patency to fresh allografts.
    • Preservation methods significantly impacted patency, and rejection was a factor in synthetic and cryopreserved grafts.

    Conclusions:

    • Venous allograft preservation protocols significantly influence graft patency.
    • Current allograft preservation methods do not consistently outperform synthetic grafts.
    • Further research involving immunosuppression and antigenic matching is needed to improve viable venous allograft outcomes.