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Related Experiment Videos

Thromboembolic and bleeding complications after mitral valve replacement.

U Eberlein1, J von der Emde, J Rein

  • 1Department of Cardiac Surgery, University of Erlangen-Nürnberg, FRG.

European Journal of Cardio-Thoracic Surgery : Official Journal of the European Association for Cardio-Thoracic Surgery
|January 1, 1990
PubMed
Summary

Mitral valve replacement surgery carries risks of thromboembolism and bleeding, with higher thromboembolic risk in the first year post-surgery. Inadequate anticoagulation and prior embolism history increase these risks.

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Area of Science:

  • Cardiovascular Surgery
  • Biomaterials Science
  • Clinical Epidemiology

Background:

  • Mitral valve replacement (MVR) is a critical procedure for patients with severe mitral valve disease.
  • Various prosthetic valves, including mechanical (Starr-Edwards, Bjørk-Shiley, St. Jude Medical) and bioprosthetic (Carpentier-Edwards), are used.
  • Understanding the long-term complication rates, such as thromboembolism and hemorrhage, is crucial for patient management.

Purpose of the Study:

  • To retrospectively evaluate the rates of thromboembolism and major hemorrhage after isolated mitral valve replacement.
  • To identify risk factors associated with these complications.
  • To compare complication rates across different types of prosthetic valves.

Main Methods:

  • Retrospective analysis of 1,668 consecutive patients who underwent isolated mitral valve replacement between 1963 and 1984.

Related Experiment Videos

  • Calculation of linearized rates for thromboembolism and hemorrhage per patient-year (PY).
  • Statistical analysis to identify significant differences and risk factors, including prothrombin time (PT) and preoperative history.

    • Main Results:

    • Thromboembolism rates ranged from 2.4% to 3.4%/PY across different valve types, with no significant differences.
    • Smaller St. Jude Medical valve sizes showed a significantly higher incidence of thromboembolism.
    • Major hemorrhage occurred at a linearized rate of 1.6%/PY. Thromboembolism risk was higher in the first postoperative year, while bleeding occurred at a constant rate.
    • Inadequate anticoagulation (PT outside therapeutic range) and a preoperative history of embolism were significant risk factors for thromboembolism.
    • Low PT (<15%) was noted in 30% of hemorrhage events.

    Conclusions:

    • While overall complication rates were similar across valve types, specific factors like valve size and anticoagulation control significantly impact outcomes.
    • Thromboembolism is a time-dependent risk, particularly elevated in the first postoperative year.
    • Patient-specific factors, such as a history of embolism, and management factors, like anticoagulation adequacy, are critical for minimizing complications after MVR.