Efeitos do óleo essencial de Alpinia zerumbet no infarto do miocárdio induzido por isoproterenol em ratos

• Ano de defesa: 2011
• Autor(a) principal: Lobo Filho, Heraldo Guedes
• Tipo de documento: Dissertação
• Tipo de acesso: Acesso aberto
• Idioma: por
• Palavras-chave em Português: Infarto do Miocárdio; Isoproterenol; Plantas Medicinais
• Link de acesso: http://www.repositorio.ufc.br/handle/riufc/7338

Acute myocardial infarction (AMI), defined as death of the cardiac muscle after an ischemic process, is worldwide known for its frequent diagnosis within hospitalized patients in modern industrialized countries. Myocardial infarction induced by isoproterenol (ISO) in rats is a very useful assay to study the effect of drugs on myocardial injury as a result of AMI, once its administration is responsible for a post-infarction human-like myocardial lesion. In this study, essential oil of Alpinia zerumbet (EOAZ), at a dose of 100 mg / kg, administered for fourteen consecutive days, was assessed in myocardial infarction induced by ISO (150 mg / kg bodyweight) in Wistar rats. The myocardial injury induced by ISO was indicated by elevated markers of myocardial injury, such as AST and troponin I, reduced levels of catalase and glutathione, as well as histopathological changes evaluated at the apex of the left ventricle. It was also evaluated mortality, hemoglobin levels, leukocyte and neutrophil counts and levels of markers of renal function. Pretreatment with the EOAZ showed protective effects on myocardial infarction induced by isoproterenol in rats, as attenuated the elevation of AST, Troponin I, attenuated the increased number of neutrophils; preserved the levels of catalase in the myocardium and preserved glutathione levels in the myocardium. However, do not exert any effects on mortality, weight variation of animals, serum ALT, serum levels of hemoglobin and white blood cell count, serum markers of renal function, histopathological changes in left ventricular apex. The probable mechanisms of action responsible for the beneficial effects of this oil in reduce the degree of myocardial injury in this experimental model may be related to antioxidant properties and increased levels of nitric oxide.