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Related Experiment Videos

Biological vs. mechanical aortic root replacement.

John G Byrne1, Tomas Gudbjartsson, Alexandros N Karavas

  • 1Division of Cardiac Surgery, Brigham and Women's Hospital, 75 Francis Street, Boston, MA 02115, USA. jbyrne@partners.org

European Journal of Cardio-Thoracic Surgery : Official Journal of the European Association for Cardio-Thoracic Surgery
|March 5, 2003
PubMed
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This study found no significant difference in early or mid-term outcomes between biological (BIO) and mechanical (MECH) aortic root prostheses. Further long-term evaluation is needed to determine the advantages of each type of valve replacement.

Area of Science:

  • Cardiovascular Surgery
  • Biomaterials Science
  • Prosthetic Valve Technology

Background:

  • Aortic root replacement involves choosing between biological (BIO) and mechanical (MECH) prostheses.
  • Age and coronary disease influence valve choice in simple aortic valve replacement.
  • Selection criteria for aortic root prosthesis type are not well-documented.

Purpose of the Study:

  • To compare the outcomes of biological versus mechanical aortic root replacement.
  • To investigate the selection criteria for BIO vs. MECH aortic root prostheses.

Main Methods:

  • A retrospective analysis of 221 patients undergoing elective aortic root replacement with BIO (n=136) or MECH (n=85) grafts.
  • Median follow-up of 39-42 months for mortality and morbidity.

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  • Analysis of patient demographics, etiologies, concomitant procedures, and outcomes.

    • Main Results:

    • Operative mortality was low and similar between BIO (1.5%) and MECH (2.4%) groups.
    • Five-year survival showed a trend favoring BIO (92.4% vs. 88.2%, P=0.068).
    • Five-year freedom from valve-related complications was comparable (BIO=93% vs. MECH=86%, P=0.5).

    Conclusions:

    • Elective aortic root replacement is a safe procedure with no meaningful early or mid-term differences between BIO and MECH prostheses.
    • Independent predictors of late death include increasing age, previous valve replacement, concomitant CABG, and perioperative stroke.
    • Long-term follow-up is necessary to ascertain definitive advantages of one prosthesis type over the other.