Relation between choice of prostheses and late outcome in double-valve replacement

Area of Science:

• Cardiovascular Surgery
• Biomedical Engineering
• Clinical Outcomes Research

Background:

• Combined aortic and mitral valve replacement is a complex procedure.
• The choice between mechanical and bioprosthetic valves impacts long-term patient management.
• Understanding late morbidity and mortality is crucial for optimizing valve selection.

Purpose of the Study:

• To compare late morbidity and mortality in patients undergoing combined aortic and mitral valve replacement.
• To evaluate outcomes for dual mechanical valves versus dual bioprosthetic valves versus a combination of both.
• To assess the influence of valve type on survival and reoperation rates.

Main Methods:

• Retrospective review of 89 hospital survivors of combined aortic and mitral valve replacement.
• Mean follow-up of 6.6 years (583 total years, 98% complete).
• Analysis of actuarial survival, freedom from reoperation, and freedom from thromboembolism/hemorrhage.

Main Results:

• No significant difference in overall survival at 15 years across dual mechanical, dual bioprosthetic, or combined valve groups.
• Dual mechanical valves showed a lower reoperation rate compared to dual bioprosthetic or combined valves.
• Increased number of mechanical valves correlated with higher risk of thromboembolism and anticoagulant-related hemorrhage.

Conclusions:

• Valve type in combined aortic and mitral replacement does not affect 15-year survival.
• Mechanical valves may offer an advantage in reducing reoperation rates.
• The choice of valve prosthesis should balance reoperation risk against thromboembolic and hemorrhage risks.