Key result
Glutaraldehyde-preserved kangaroo aortic wall tissue was significantly less calcified than porcine tissue at 8 weeks (26.67 vs 41.959 microg/mg tissue; p<0.01) in a subcutaneous rat model.
Why the study?
Does glutaraldehyde-fixed kangaroo aortic wall tissue reduce calcification compared to porcine tissue in a subcutaneous rat model?
Does glutaraldehyde-fixed kangaroo aortic wall tissue reduce calcification compared to porcine tissue in a subcutaneous rat model?
Kangaroo aortic wall tissue demonstrates reduced calcification potential compared to porcine tissue in a rat model, suggesting potential for improved durability as a bioprosthesis.
Answers are grounded in this paper and cite their sources.
May warrant preclinical testing of kangaroo tissue; leaves open any durability benefit in human bioprostheses.
Stentless aortic heart valve substitutes, manufactured from biological tissues, are fixed with glutaraldehyde to cross-link collagen, reduce antigenicity, and sterilize the tissue. Despite improved cross linking, reduced antigenicity, and various anticalcification measures, the aortic wall tissue present in these prostheses tends to calcify. The aim of this study was to assess the morphology, collagen cross-link stability, and calcification potential of glutaraldehyde-preserved kangaroo aortic wall tissue as opposed to porcine aortic wall tissue. Porcine and kangaroo aortic wall tissues were fixed in 0.625% buffered glutaraldehyde. Histology and cross-link stability were examined. Calcification potential was determined in the subcutaneous rat model. Kangaroo aortic wall tissue was significantly (p < 0.01) less calcified than porcine aortic wall tissue (26.67 +/- 6.53 versus 41.959 +/- 2.75 microg/mg tissue) at 8 weeks. In conclusion, the histological differences between kangaroo and porcine aortic wall tissue correlate well with the reduced calcification potential of kangaroo aortic wall tissue. The reduced calcification potential could result in improved long-term durability of stentless kangaroo heart valves as bioprostheses.
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Neethling et al. (2003) studied Calcification of bioprosthetic heart valves. Glutaraldehyde-preserved kangaroo aortic wall tissue vs. Glutaraldehyde-preserved porcine aortic wall tissue was evaluated on Calcification potential in a subcutaneous rat model (p=<0.01). Glutaraldehyde-preserved kangaroo aortic wall tissue was significantly less calcified than porcine tissue at 8 weeks (26.67 vs 41.959 microg/mg tissue; p<0.01) in a subcutaneous rat model.
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