The effect of liquid nitrogen submersion on cryopreserved human heart valves
| Autor: | Perry Lange, Jian Fei Hu, Lloyd Wolfinbarger, Mike Adam |
|---|---|
| Rok vydání: | 1989 |
| Předmět: |
Cryopreservation
Materials science Nitrogen Vapor phase Human heart Organ Preservation Anatomy General Medicine In Vitro Techniques Liquid nitrogen Heart Valves General Biochemistry Genetics and Molecular Biology medicine.anatomical_structure Microscopy Electron Scanning medicine Humans Heart valve General Agricultural and Biological Sciences Biomedical engineering |
| Zdroj: | Cryobiology. 26:578 |
| ISSN: | 0011-2240 |
| DOI: | 10.1016/0011-2240(89)90200-9 |
| Popis: | Cryopreservation and storage of human heart valves have become an accepted means of maintaining a usable supply of heart valves for outflow track reconstructive surgery. Valves are typically stored at the vapor phase temperature of liquid nitrogen, -130 degrees C and below, to reduce the chance of recrystallization within the tissues. Concern over the effects of submersion of the valves in liquid nitrogen, i.e., plunging to -196 degrees C, prompted this study. Cryopreserved valves were plunged into liquid nitrogen, held for 5 min, and then processed (thawed) by standardized protocols. The thawed valves were then assessed using scanning electron microscopy and the more traditional histology at the light microscope level. Cuspal tissues plunged into liquid nitrogen appear to have numerous microfractures over both surfaces of the tissue, penetrating into the collagen/proteoglycan matrix. Control cryopreserved valves do not exhibit these microfractures. Histologically, the submerged valves appear normal. The clinical use of valves which have been submerged in liquid nitrogen is discussed. |
| Databáze: | OpenAIRE |
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