Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
8460446 | Annals of Anatomy - Anatomischer Anzeiger | 2017 | 17 Pages |
Abstract
Human cryopreserved allografts of pulmonary and aortic heart valves, aortas and pulmonary trunks are used for valve replacement. However, it is unknown how the composition of these allografts relate to their mechanical properties. Our aims were to correlate the histological compositions and passive mechanical properties of aortic and pulmonary valves and to observe the microcracks of aortas and pulmonary trunks. The following parameters were quantified: ultimate stress; ultimate strain; Young's modulus of elasticity; valve cusp wall thickness; pulmonary and aortic intima-media thickness; area fraction of elastin, collagen and calcification; and length density of elastic fibres. The propagation of experimentally induced microcracks avoided elastic fibres. Ultimate strain was negatively correlated with the area fraction of calcification (r = â0.4) in aortas. Ultimate stress (r = 0.27) and Young's modulus in small deformation (r = 0.29) and in large deformation (r = 0.32) correlated with wall thickness in valve cusps. Young's modulus (r = 0.34) and ultimate strain (r = 0.31) correlated with intima-media thickness. Ultimate strain correlated with the area fraction of elastin (r = â0.40) and collagen in the arteries (r = 0.31). As conventional histology does not fully explain the mechanical properties of cryopreserved grafts, both morphological and biomechanical tests should be used complementarily when characterizing the ageing of the grafts.
Related Topics
Life Sciences
Biochemistry, Genetics and Molecular Biology
Cell Biology
Authors
Tereza KubÃková, Petra Kochová, Jan Brázdil, Jaroslav Å patenka, Jan Burkert, Milena KrálÃÄková, ZbynÄk Tonar,