Effect of different periods of hyperbaric oxygen on ischemia-reperfusion injury of rat small bowel
dc.contributor.author | Bertoletto, Paulo Roberto | |
dc.contributor.author | Chaves, José Carlos | |
dc.contributor.author | Fagundes, Anna Tereza Negrini | |
dc.contributor.author | Simões, Ricardo Santos [UNIFESP] | |
dc.contributor.author | Oshima, Celina Tizuko Fujiyama [UNIFESP] | |
dc.contributor.author | Simões, Manuel de Jesus [UNIFESP] | |
dc.contributor.author | Fagundes, Djalma José [UNIFESP] | |
dc.contributor.institution | University of Grande Dourados | |
dc.contributor.institution | Santo Amaro University Medical School | |
dc.contributor.institution | Universidade Federal de São Paulo (UNIFESP) | |
dc.date.accessioned | 2015-06-14T13:38:21Z | |
dc.date.available | 2015-06-14T13:38:21Z | |
dc.date.issued | 2008-02-01 | |
dc.description.abstract | PURPOSE: To determine whether hyperbaric oxygen (HBO) could effectively protect the small intestine mucosa against an ischemic insult, according to different periods of application. METHODS: The gut of 32 male rats was subjected to 60-min ischemia (clamping the mesenteric artery and vein); After they were further reperfused upon clamp opening during 60 min. Animal groups were as follows. GII = placed on HBO during the ischemia period; GIII = placed on HBO during reperfusion; GIV = treated with HBO throughout the ischemia-reperfusion period. Some animals (GI) did not receive HBO treatment at all and served as reference of ischemia-reperfusion injury (IR). HBO was carried out in a cylindrical acrylic chamber (2.0 ATA). Samples of small bowel were prepared for H.E staining for histological evaluations. RESULTS: The histological injury of mucosa was significantly less when HBO was administered during the ischemia period (17.6 ± 0.6) as compared with the IR (21.3 ± 1.8). HBO was not effective when applied during reperfusion (23.1 ± 2.1) or during the ischemia plus reperfusion period (18.7 ± 1.9). The thickness of the mucosa was preserved by HBO in ischemia (327.50 ± 30.23 µm) in comparison with the IR (172.79 ± 5.95 µm). In the periods of reperfusion (162.50 ± 6.05 µm) and ischemia plus reperfusion (296.49 ± 20.01 µm) the mucosa revealed a structural injury. CONCLUSION: Hyperbaric oxygen affects the ischemic insult of small bowel, being the favorable effect obtained when hyperbaric oxygen was administered early in the ischemic period. | en |
dc.description.abstract | OBJETIVO: Determinar se a oxigenação hiperbárica (OHB) protege a mucosa do intestino delgado de ratos após isquemia e reperfusão. MÉTODOS: 32 ratos machos foram submetidos a clampeamento da artéria e da veia mesentéricas superiores durante 60 minutos (isquemia) seguido de 60 minutos de reperfusão. Após estes procedimentos os animais fora separados em quatro grupos, a saber: grupo I (GI) isquemia e reperfusão (IR); grupo II (GII) submetido a OHB concomitante a isquemia, Grupo III (GIII) submetido a OHB durante a reperfusão e, grupo IV (GIV) submetido a OHB durante o período de isquemia e de reperfusão. A OHB foi realizada em câmara acrílica (2.0 ATA). Após anestesia, fragmentos do intestino delgado (íleo) foram fixados e processados para inclusão em parafina sendo os cortes corados pelo HE. As lâminas foram avaliadas quanto a presença de lesões histopatológicas da mucosa e avaliado a espessura da mucosa. RESULTADOS: A lesão histopatológica da mucosa foi significativamente inferior quando a OHB foi administrada na isquemia (12.6 ± 0.6) em comparação com o IR (21.3 ± 1.8). A OHB não foi efetiva quando aplicada durante a reperfusão (23.1 ± 2.1), ou durante a isquemia e reperfusão (18.7 ± 1.9). A espessura da mucosa foi preservada pela OHB na isquemia (327,50 ± 30.23 µm) em comparação com o IR (172.79 ± 5.95 µm). Nos períodos de reperfusão (162.50 ± 6.05 µm) e a isquemia (296.49 ± 20.01 µm) a mucosa apresentou lesão estrutural. CONCLUSÃO: A oxigenação hiperbárica protege a mucosa intestinal quando realizada durante o período de isquemia. | pt |
dc.description.affiliation | University of Grande Dourados | |
dc.description.affiliation | Santo Amaro University Medical School | |
dc.description.affiliation | Federal University of São Paulo Medical School | |
dc.description.affiliation | UNIFESP Molecular Pathology Division, Department of Pathology | |
dc.description.affiliation | Universidade Federal de São Paulo (UNIFESP) Department of Morphology Head of Histology and Structural Biology Division | |
dc.description.affiliation | Universidade Federal de São Paulo (UNIFESP) Department of Surgery Surgery Division of Operative Technique and Experimental Surgery | |
dc.description.affiliationUnifesp | UNIFESP, Medical School | |
dc.description.affiliationUnifesp | UNIFESP, Molecular Pathology Division, Department of Pathology | |
dc.description.affiliationUnifesp | UNIFESP, Department of Morphology Head of Histology and Structural Biology Division | |
dc.description.affiliationUnifesp | UNIFESP, Department of Surgery Surgery Division of Operative Technique and Experimental Surgery | |
dc.description.source | SciELO | |
dc.format.extent | 11-15 | |
dc.identifier | http://dx.doi.org/10.1590/S0102-86502008000100003 | |
dc.identifier.citation | Acta Cirurgica Brasileira. Sociedade Brasileira para o Desenvolvimento da Pesquisa em Cirurgia, v. 23, n. 1, p. 11-15, 2008. | |
dc.identifier.doi | 10.1590/S0102-86502008000100003 | |
dc.identifier.file | S0102-86502008000100003.pdf | |
dc.identifier.issn | 0102-8650 | |
dc.identifier.scielo | S0102-86502008000100003 | |
dc.identifier.uri | http://repositorio.unifesp.br/handle/11600/4198 | |
dc.identifier.wos | WOS:000258573600003 | |
dc.language.iso | eng | |
dc.publisher | Sociedade Brasileira para o Desenvolvimento da Pesquisa em Cirurgia | |
dc.relation.ispartof | Acta Cirurgica Brasileira | |
dc.rights | Acesso aberto | |
dc.subject | Hyperbaric Oxygenation | en |
dc.subject | Ischemia | en |
dc.subject | Intestine | en |
dc.subject | Small | en |
dc.subject | Rats | en |
dc.subject | Oxigenação Hiperbárica | pt |
dc.subject | Isquemia | pt |
dc.subject | Intestino Delgado | pt |
dc.subject | Ratos | pt |
dc.title | Effect of different periods of hyperbaric oxygen on ischemia-reperfusion injury of rat small bowel | en |
dc.title.alternative | Efeitos de diferentes períodos de oxigenação hiperbárica na lesão de isquemia e reperfusão de intestino delgado de ratos | pt |
dc.type | Artigo |
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