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  • About
  • The Global ETD Search service is a free service for researchers to find electronic theses and dissertations. This service is provided by the Networked Digital Library of Theses and Dissertations.
    Our metadata is collected from universities around the world. If you manage a university/consortium/country archive and want to be added, details can be found on the NDLTD website.
1

Proposed improvements in cardioplegia

King, Linda Mary 06 April 2017 (has links)
No description available.
2

Endothelium-dependent hyperpolarization and relaxation of coronary circulationg during cardioplegic arrest of the heart

Ge, Zhidong. January 2000 (has links)
Thesis (Ph. D.)--University of Hong Kong, 2001. / Includes bibliographical references (leaves 209-255).
3

Endothelium-dependent hyperpolarization and relaxation of coronary circulationg during cardioplegic arrest of the heart

葛志東, Ge, Zhidong. January 2000 (has links)
published_or_final_version / Surgery / Doctoral / Doctor of Philosophy
4

Efeito protetor de nova solução cardioplégica com histidinatriptofano- glutamato em coração isolado de ratos

Oliveira, Marcos Aurélio Barboza de 09 December 2014 (has links)
Submitted by Fabíola Silva (fabiola.silva@famerp.br) on 2016-09-27T15:19:20Z No. of bitstreams: 1 marcosaureliobdeoliveira_tese.pdf: 6679652 bytes, checksum: cda6b164bdebbe6a1f4cfdb403d7ea04 (MD5) / Made available in DSpace on 2016-09-27T15:19:20Z (GMT). No. of bitstreams: 1 marcosaureliobdeoliveira_tese.pdf: 6679652 bytes, checksum: cda6b164bdebbe6a1f4cfdb403d7ea04 (MD5) Previous issue date: 2014-12-09 / Introduction: Solutions that cause elective cardiac arrest are often evolving, but the ideal compound has not yet been found. The authors compare a new cardioplegic solution with histidine-tryptophan-glutamate (HTG) with histidine-tryptophan-acetoglutarato (HTK) in a model of isolated rat heart. Objective: Benchmarking HTK and HTG solutions regarding the activity of caspase, KI -67, IL - 8, Shannon entropy and fractal dimension. Materials and Methods: Twenty male rats, Wistar race, were analyzed and heparinized. The chest was opened, held and cardiectomia infused 40 mL/kg of appropriate cardioplegia. The hearts were kept for 2 hours at 4°C in the same solution, and afterwards placed in the Langendorff apparatus for 30 min with Ringer-Locke solution. The immunohistochemical analyses were performed for caspase, IL-8, KI-67, Shannon entropy and fractal dimension. Results: The concentration of caspase was lower in group 2, and KI-67 was higher in group 2, both P<0.05. There was no statistical difference between the values of IL-8 between the groups. Both the Shannon entropy and the fractal dimension were not different in the two groups. Conclusions: The HTG solution was better than with HTK because they had reduced caspase (apoptosis) increased KI-67 (cell proliferation), they did not show different values of IL-8 (inflammation, necrosis). Additionally they did not show change in amount or distribution of the information (observed by the Shannon entropy and fractal dimension) in histological slices. / Introdução: As soluções que provocam parada cardíaca eletiva estão em constante evolução, porém o composto ideal ainda não foi encontrado. Os autores comparam uma nova solução cardioplégica com histidina-triptofano-glutamato (HTG) com histidinatriptofano- acetoglutarato (HTK) em modelo de coração isolado de rato. Objetivo: Avaliar comparativamente as soluções HTK e HTG no que se refere à atividade de caspase, KI-67, IL-8, entropia de Shannon e dimensão fractal. Materiais e Métodos: Vinte ratos machos de raça Wistar foram anestesiados e heparinizados. O tórax foi aberto, realizada cardiectomia e infundido 40 mL/Kg de solução cardioplégica apropriada. Os corações foram mantidos por 2 horas na mesma solução a 4oC e, após esse período, colocados em aparato de Langendorff por 30 minutos com solução de Ringer Locke. Foram feitas análises imuno-histoquímicas para caspase, IL-8, KI-67, entropia de Shannon e dimensão fractal. Resultados: A concentração de caspase estava menor no grupo 2, e da KI-67 estava mais elevada no grupo 2, ambos com P<0,05. Não houve diferença estatística entre os valores de IL-8 entre os grupos. Tanto a entropia de Shannon quanto a dimensão fractal não foram diferentes nos dois grupos. Conclusões: A solução com HTG foi mais eficaz que a com HTK, pois reduziu a caspase (apoptose), aumentou o KI-67 (proliferação celular); não apresentou valores diferentes de IL-8 (inflamação e necrose) que no grupo 1 e não apresentou alteração da quantidade ou distribuição das informações (observadas pela entropia de Shannon e dimensão fractal) nas lâminas histológicas.

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