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Pathological considerations in cryopreserved allograft heart valves
F J Schoen1, R N Mitchell, R A Jonas
1Department of Pathology, Brigham and Women's Hospital, Boston, MA 02115, USA.
The Journal of Heart Valve Disease
|July 1, 1995
Summary
Cryopreserved allograft heart valves lose cellular viability and structure after implantation. Their function relies on the preserved collagen matrix, not living cells.
Area of Science:
- Cardiovascular Surgery
- Tissue Engineering
- Immunology
Background:
- Structure-function relationships of cryopreserved allograft heart valves are not well-established.
- Understanding valve degeneration is crucial for improving long-term outcomes.
Purpose of the Study:
- To investigate the structural and cellular changes in cryopreserved allograft heart valves after implantation.
- To compare explanted allografts with native aortic valves from transplanted hearts.
Main Methods:
- Analysis of 20 explanted cryopreserved allograft heart valves (implanted for hours to 9 years).
- Examination of 16 aortic valves from transplanted allografts (autopsy or retransplantation).
- Utilized gross inspection, radiography, light and electron microscopy, and immunohistochemistry.
Main Results:
- Implanted cryopreserved allografts showed progressive structural degradation and loss of cellularity, including endothelium.
- Explanted valves lacked viable cells, but the collagen matrix was preserved.
- Aortic valves from transplanted hearts maintained structural integrity and cellularity.
Conclusions:
- Cryopreserved allograft heart valves are morphologically non-viable after implantation.
- Valve function appears to depend on the preserved collagenous matrix.
- Transplanted aortic valves demonstrate superior structural preservation compared to cryopreserved allografts.