Chemical and structural composition study through transmission and reflection electron microscopy and X-ray microanalysis of damaged duramater cardiac valves
Description
Ten malfunctioning durameter aortic prosthesis, excised surgically after 44 to 54 months of implantation were studied through transmission and reflection electron microscopy and X-ray microanalysis. Duramater extracted at necropsy but not used for valve prosthesis and duramater aortic prosthesis not implanted in patients were used as controls. It was concluded that homologous duramater valves present subcellular changes following implantation, with degenerating and proliferating areas which could correspond either to normal adaptation or consequence of degeneration - rebuilding which begins with implantation; it is also emphazised the need for ultramicroscopic studies in evaluating biological tissues and establishing its applicability in cardiac surgery. (M.A.C.)
Abstract (Portuguese)
Estuda-se atraves de microscopia eletronica de transmissao (TEM), de reflexao (SEM) e atraves de microanalise de raios X, dez valvulas aorticas de dura-mater lesadas e recuperadas cirurgicamente 44 a 54 meses apos implantacao. Dura-mater nao utilizada na feitura de valvulas e valvulas aorticas de dura-mater nao implantadas, serviram de controle. Demonstrou-se que valvulas de dura-mater homologas apresentam modificacoes estruturais subcelulares com areas de degeneracao e proliferacao que poderiam corresponder ao mecanismo normal de restauracao ou a uma sequencia degenerativa restauradora que se inicia no momento da implantacao. Conclui-se a necessidade do estudo eletromicroscopico na avaliacao da condicao dos tecidos biologicos para se estabelecer a conveniencia da sua utilizacao em cirurgia cardiaca. (M.A.C.)Additional details
Additional titles
- Original title (Portuguese)
- Pesquisa sobre a composicao estrutural e quimica da dura-mater de valvulas cardiacas lesadas, pela microscopia eletronica de reflexao ou varredura pela microscopia eletronica de transmissao e pela microanalise de raios-X
Publishing Information
- Journal Title
- Arq. Brasil. Cardiol.
- Journal Volume
- 38
- Journal Issue
- 6
- Series
- Arq. Brasil. Cardiol.
- Journal Page Range
- 465-470
- ISSN
- 0066-782X
INIS
- Country of Publication
- Brazil
- Country of Input or Organization
- Brazil
- INIS RN
- 16024003
- Subject category
- S62: RADIOLOGY AND NUCLEAR MEDICINE;
- Descriptors DEI
- AORTA; PROSTHESES; SCANNING ELECTRON MICROSCOPY; STRUCTURAL CHEMICAL ANALYSIS; TRANSMISSION ELECTRON MICROSCO; ULTRASTRUCTURAL CHANGES; X RADIATION
- Descriptors DEC
- ARTERIES; BLOOD VESSELS; BODY; CARDIOVASCULAR SYSTEM; ELECTROMAGNETIC RADIATION; ELECTRON MICROSCOPY; IONIZING RADIATIONS; MEDICAL SUPPLIES; MICROSCOPY; MORPHOLOGICAL CHANGES; ORGANS; RADIATIONS