Valve replacement with bioprostheses for non-ischaemic mitral insufficiency

Area of Science:

• Cardiology
• Cardiac Surgery
• Biomaterials Science

Background:

• Non-ischaemic mitral insufficiency is a significant clinical challenge.
• Bioprosthetic valves have been utilized for mitral valve replacement.
• Understanding long-term outcomes is crucial for patient management.

Purpose of the Study:

• To evaluate the long-term survival and valve-related complications of isolated mitral valve replacement using bioprostheses.
• To assess the functional status of patients post-operation.
• To inform the selective use of tissue valves in mitral valve disease.

Main Methods:

• Retrospective analysis of 122 patients undergoing isolated mitral valve replacement with a bioprosthesis between 1976 and 1989.
• Follow-up averaged 78 months, totaling 763 patient-years.
• Assessment of valve-related complications, survival rates, and functional class.

Main Results:

• Early mortality was 3.3%, with a 10-year survival of 65%.
• Major valve-related complications included thromboembolism (2.1% pt-yr) and reoperations (2.6% pt-yr), primarily due to tissue valve deterioration.
• Significant functional improvement was observed, with 89% of survivors in functional class I or II post-operation.

Conclusions:

• Bioprosthetic mitral valve replacement provides excellent short-to-mid-term survival and functional outcomes.
• Limited durability beyond 10 years is a concern, with intrinsic structural deterioration being a major cause of morbidity.
• Selective use of tissue valves is recommended due to long-term durability limitations.