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Heart valve bioprostheses: antimineralization.
1Department of Pathology, Brigham and Women's Hospital, Boston, Mass.
Summary
Bioprosthetic valve calcification involves host, implant, and biomechanical factors. Preventing this mineralization requires addressing cellular calcium handling and phosphorus interactions, with strategies needing demonstrated efficacy, mechanisms, and safety.
Area of Science:
- Biomaterials science
- Cardiovascular research
- Tissue engineering
Background:
- Bioprosthetic valve calcification is a multifactorial process.
- Mineral deposits initially occur in connective tissue cells, followed by collagen involvement.
- Aldehyde cross-linking impairs cellular calcium removal mechanisms.
Purpose of the Study:
- To elucidate the mechanisms of bioprosthetic valve calcification.
- To identify key factors influencing mineralization.
- To outline strategies for preventing bioprosthetic tissue mineralization.
Main Methods:
- Review of clinical and experimental studies.
- Analysis of cellular calcium and phosphorus dynamics.
- Evaluation of factors affecting bioprosthetic tissue mineralization.
Main Results:
- Calcification is influenced by host, implant, and biomechanical factors.
- Dysfunctional calcium removal and phosphorus interactions contribute to apatite formation.
- Early mineral deposits are localized to transplanted connective tissue cells.
Conclusions:
- Preventing bioprosthetic valve calcification requires modifying valve preparation or the local implant environment.
- Any antimineralization strategy must demonstrate efficacy, elucidate mechanisms, and ensure safety.