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Related Experiment Videos

Cardiac valve replacement (1963-1979).

H M Windsor, M X Shanahan, V P Chang

    The Medical Journal of Australia
    |July 28, 1979
    PubMed
    Summary
    This summary is machine-generated.

    Cardiac valve replacement outcomes show bioprostheses are now preferred over mechanical valves due to better survival rates, despite mechanical valves offering longer durability. Long-term survival data is presented for various prosthetic types.

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    Area of Science:

    • Cardiovascular Surgery
    • Biomedical Engineering
    • Prosthetic Devices

    Background:

    • A 15-year retrospective study analyzed cardiac valve replacement outcomes.
    • Evaluated mechanical prosthetic valves (caged ball, tilting disc) and bioprostheses (porcine xenografts).
    • Compared survival rates across different valve types and replacement scenarios.

    Purpose of the Study:

    • To report long-term survival rates for mechanical and bioprosthetic cardiac valves.
    • To compare the efficacy of different prosthetic valve types in cardiac valve replacement.
    • To establish current preferences for cardiac valve prostheses based on historical data.

    Main Methods:

    • Actuarial survival analysis was performed on patient data from 1963-1978.
    • Survival rates were calculated for mitral and aortic valve replacements.

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  • Outcomes for single, double, and triple valve replacements were analyzed.

    • Main Results:

    • Caged ball mitral valve replacement (Starr-Edwards) showed 42% survival at 12 years.
    • Tilting disc mitral valve replacement (Björk-Shiley, Lillehei-Kaster) showed 74% survival at 6-7 years.
    • Bioprostheses showed no late deaths in 121 implants since 1977, but are less durable and carry thromboembolism risk.

    Conclusions:

    • Bioprostheses are now the preferred choice for cardiac valve replacement.
    • While less thrombogenic, bioprostheses have reduced durability compared to mechanical valves.
    • Mechanical valves demonstrate varying long-term survival rates depending on type and position.