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This is a Quantitative Study study.

Alterations in the Collagen Fiber Architecture of Porcine Bioprosthetic Heart Valve Leaflets due to Accelerated Testing

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Quantitative analysis reveals changes in collagen fibers and mechanical properties of bioprosthetic heart valves after accelerated testing.

Microstructural changes in collagen fibers affect the mechanical properties of bioprosthetic heart valves, suggesting reduced long-term durability.
Previous findings indicate leaflet collagen fibers in porcine bioprosthetic heart valves are stretched by 35% of their pre-implant length during testing.
This study utilized the SALS technique to quantify alterations in collagen fiber architecture in heart valve leaflets due to accelerated testing.
Understanding these microstructural changes is critical for improving the durability and performance of bioprosthetic heart valves.

Sacks et al. (1995) studied this question.

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Quantitative analysis reveals changes in collagen fibers and mechanical properties of bioprosthetic heart valves after accelerated testing.