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Long-term outcome after mitral valve replacement using biological versus mechanical valves
Ayse Cetinkaya1, Julia Poggenpohl1, Karin Bramlage2
1Department of Cardiac Surgery, Kerckhoff-Heart Center Bad Nauheim, 61231, Bad Nauheim, Germany.
Journal of Cardiothoracic Surgery
|June 30, 2019
Summary
Mechanical mitral valve replacement (MVR) increases bleeding risk, while biological MVR shows early survival benefits that diminish over 10 years. Long-term survival rates become comparable between both valve types.
Area of Science:
- Cardiovascular Surgery
- Biomaterials Science
- Clinical Outcomes Research
Background:
- Mitral valve replacement (MVR) is necessary when repair is not feasible.
- Comparing long-term outcomes of biological versus mechanical MVR is crucial for patient management.
- This study addresses the need for evidence-based selection of prosthetic valves.
Purpose of the Study:
- To compare the long-term clinical outcomes of biological and mechanical mitral valve replacement.
- To evaluate differences in mortality, morbidity, and survival rates between the two valve types.
- To inform clinical decision-making regarding mitral valve prostheses.
Main Methods:
- A single-center registry of 324 patients undergoing MVR between 2005 and 2015 was analyzed.
- Patients received either biological (n=265) or mechanical (n=59) valves.
- Thirty-day and long-term outcomes, including mortality, stroke, renal failure, and re-thoracotomy, were compared.
Main Results:
- Immediate procedural mortality occurred only in the biological valve group (1.9%).
- Mechanical valves were associated with a significantly higher rate of bleeding complications (p=0.009).
- While biological valves showed a trend towards better early survival, 10-year survival rates were similar (62.4% biological vs. 77.1% mechanical; p=0.769).
Conclusions:
- Mechanical valve implantation is linked to an increased risk of bleeding complications.
- Biological valves may offer a transient survival advantage in the initial years post-surgery.
- Long-term survival differences between biological and mechanical mitral valves become insignificant after 10 years.
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