Subcoronary Allograft Aortic Valve Replacement: Parametric Risk-Hazard Outcome Analysis to a Minimum of 20 Years

Edward Hickey, Stephen M. Langley, Oliver Allemby-Smith, Steven A. Livesey, James L. Monro

    Research output: Contribution to journalArticle

    11 Scopus citations

    Abstract

    Background: Differences in sterilization, preservation, and implantation have been implicated in aortic allograft longevity. We report follow-up to 30 years of patients from a single unit who underwent aortic valve replacement with aortic allografts sterilized in antibiotics and refrigerated at 4°C. Methods: Two hundred consecutive patients underwent subcoronary allograft aortic valve replacement and have been followed up to a minimum of 20 and maximum of 30 years. Follow-up was 96% complete. Parametric hazard phase modeling was used to identify incremental predictors of time-related risk. Results: Early mortality was 1.5%. Kaplan-Meier actuarial survival, including early death, was 81.2% ± 2.8% (mean ± standard error of the mean), 58.0% ± 3.7%, and 52% ± 5.1% at 10, 20, and 25 years, respectively. Freedom from reoperation for any reason was 86.4% ± 2.6%, 39.6% ± 5.2%, and 35.0% ± 5.4% at 10, 20, and 25 years, respectively. Larger implanted valve, reexploration for bleeding, previous cardiac surgery, and operative rank were independent risks for reoperation. Early mortality in reoperations was 5.1%. Allograft endocarditis has occurred in 6 patients, giving an overall freedom of 94% at 25 years. Seven patients of the original cohort are known to be alive with their original allograft valve in situ, and of these the longest follow-up period is 29.8 years. Conclusions: The use of antibiotic-sterilized allografts for subcoronary aortic valve replacement confers low operative mortality and excellent long-term survival with durability matching any other nonmechanical device. Significantly reduced time-related risk of reoperation and excellent internal to external diameter ratio renders allograft aortic valve replacement especially ideal for smaller roots.

    Original languageEnglish (US)
    Pages (from-to)1564-1570
    Number of pages7
    JournalAnnals of Thoracic Surgery
    Volume84
    Issue number5
    DOIs
    StatePublished - Nov 1 2007

    ASJC Scopus subject areas

    • Surgery
    • Pulmonary and Respiratory Medicine
    • Cardiology and Cardiovascular Medicine

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