title: [Changes in the obturating elements of heart valve prostheses in the process of long-term functioning].
mesh_terms: D001021:Aortic Valve; D055598:Chemical Phenomena; D002627:Chemistry, Physical; D002855:Chromatography, Thin Layer; D005500:Follow-Up Studies; D006350:Heart Valve Prosthesis; D006801:Humans; D008854:Microscopy, Electron; D008943:Mitral Valve; D013997:Time Factors; D014961:X-Ray Diffraction
vernacular_title: Izmeneniia zapiratel'nykh élementov protezov klapanov serdtsa v protsesse dlitel'noĭ funktsii.