Tissue valve prosthesis implantation in 801 cases.

Area of Science:

• Cardiovascular Surgery
• Biomaterials Science
• Clinical Outcomes Research

Background:

• Heart valve replacement is a common surgical procedure.
• Tissue valve prostheses and mechanical valve prostheses are primary options.
• Long-term outcomes and complications influence prosthesis selection.

Purpose of the Study:

• To evaluate the long-term outcomes and complication rates of tissue valve prostheses.
• To compare the performance of bioprostheses in aortic versus mitral positions.
• To identify patient factors influencing bioprosthetic valve durability.

Main Methods:

• Retrospective analysis of 1,017 tissue valve prostheses implanted between 1976 and 1989.
• Comparison with 1,321 mechanical valve prostheses implanted during the same period.
• Assessment of reoperation rates, mortality, and specific complications like calcification and degeneration.

Main Results:

• Hospital mortality was 8.1%. Reoperation was required for 14.5% of bioprostheses (14.1% of patients).
• No significant mortality difference between first and second operations.
• Higher incidence of calcification and degeneration in mitral (15.5%) vs. aortic (12.4%) bioprostheses, and in younger patients. Reoperations peaked at 7 years post-implantation.

Conclusions:

• Tissue valve prostheses, particularly mitral bioprostheses, are prone to earlier calcification and degeneration, especially in younger patients.
• While mortality rates are similar for initial and replacement surgeries, reoperation rates highlight potential long-term limitations of bioprosthetic valves.
• Further research into improved bioprosthetic materials and patient selection is warranted to enhance long-term valve durability.