22 aortic allografts were included in the research. After sterilisation allografts were cryopreserved to the temperature -80°C. We used two storage regimens: at -196°C (n=10) and at -150°C (n=12). After defrosting we performed visual inspection of allografts, as well as hydraulic and histological tests. Our results show that optimal storage regimen for aortic allografts is in pairs of liquid nitrogen at temperature -150°C. Such regimen provides allograft integrity, durability and preservation of its histological structure. At the same time, storage of aortic allografts by immersing them in liquid nitrogen provides allograft integrity and durability, but negatively influence on its histological structure, which can affect long-term durability.
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