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Venous prostheses: improved patency with external stents.

R J Robison, P S Peigh, A C Fiore

    The Journal of Surgical Research
    |April 1, 1984
    PubMed
    Summary
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    External stents significantly improve the patency of polytetrafluoroethylene (PTFE) grafts in the infrarenal vena cava. This finding supports the clinical use of stented PTFE for venous system replacements.

    Area of Science:

    • Vascular Surgery
    • Biomaterials Science
    • Medical Device Engineering

    Background:

    • Vascular prostheses for venous system replacement have historically faced challenges with long-term patency.
    • Polytetrafluoroethylene (PTFE) grafts are commonly used but can suffer from collapse or thrombosis in venous applications.
    • Developing successful venous prostheses remains a critical unmet need in reconstructive surgery.

    Purpose of the Study:

    • To evaluate the impact of external stenting on the patency rates of polytetrafluoroethylene (PTFE) grafts placed in the infrarenal vena cava.
    • To compare the performance of stented PTFE grafts versus non-stented PTFE grafts in a canine model.
    • To determine if external support enhances the durability of PTFE grafts in a high-flow venous environment.

    Main Methods:

    Related Experiment Videos

    • A comparative study involving 21 mongrel dogs undergoing infrarenal vena cava replacement.
    • Grafts consisted of 8 cm X 10 mm polytetrafluoroethylene (PTFE) segments, either with external stenting (12 dogs) or without (9 dogs).
    • Graft patency was assessed using contrast venography at 7, 30, and 90 days post-implantation.

    Main Results:

    • Stented PTFE grafts demonstrated superior patency rates compared to non-stented grafts at all time points.
    • Specifically, 7-, 30-, and 90-day patency for stented grafts was 100%, 83%, and 75% respectively, versus 67%, 22%, and 22% for non-stented grafts.
    • The difference in patency between the stented and non-stented groups at 30 and 90 days was statistically significant (P < 0.05).

    Conclusions:

    • External stenting significantly enhances the early patency of polytetrafluoroethylene (PTFE) grafts in the infrarenal vena cava.
    • The findings suggest that externally stented PTFE prostheses are a promising option for venous system reconstruction.
    • Clinical consideration of externally stented PTFE grafts is warranted for required venous prosthetic replacements.