The myocardium is known to release CPK, LDH1 , and GOT in response to ischemia as a result of myocardial infarction. This study was designed to induce the release of cardiac enzymes without adversely effecting the myocardium by perfusion hypothermia, thereby suggesting that these enzymes are not as specific in the diagnosis of myocardial infarction as once thought. Hypothermia was by in vivo perfusion of the left anterior descending coronary artery. Enzyme activity was measured from sera samples spectrophotometrically and electrophoretically. Significant CPK and LDH1 increases were observed in animals perfused between 25 and 19 C. These results indicate that, while heart function remained unchanged, an alteration occurred in the membrane integrity of the myocardial cells.

Made available in DSpace on 2016-01-26T18:55:30Z (GMT). No. of bitstreams: 1 Dissertacao.pdf: 208468 bytes, checksum: 9493c81d791b19a0b7ecb64fc69e95f8 (MD5) Previous issue date: 2010-06-21 / With the aim of studying the changes promoted by larvae of Toxocara canis on the cardiac enzymes creatine kinase (CK), creatine kinase MB fraction (CK-MB) and lactate dehydrogenase (LDH) from rats three months old, according to load infective and time, two groups were formed with 24 animals, 12 males and 12 females per group. The animals received 250 (Group I) and 1000 (Group II) eggs larvae of T. canis, orally. Another group, consisting of 12 animals, six of each sex served as controls. On day seven, 15, 30, 60, 120 and 180 post-infection was performed in each moment, the euthanasia of four animals from each of the two experimental groups and control group. Blood samples were collected by puncturing the caudal vena cava. The peaks of enzyme activity measured in animals infected with 250 eggs preceded those of animals that received 1000 eggs. It can be concluded that the lower the infective load faster is to increase the activity of enzymes used as markers and cardiac changes are more precocious in other tissues as compared to the heart muscle. / Com o objetivo de estudar as alterações promovidas por larvas de Toxocara canis sobre as enzimas cardíacas creatinoquinase (CK), creatinoquinase fração MB (CK-MB) e lactato desidrogenase (LDH) de ratos Wistar de três meses de idade, em função da carga infectante e do tempo, foram formados dois grupos com 24 animais, 12 machos e 12 fêmeas por grupo. Os animais receberam 250 (Grupo I) e 1000 (Grupo II) ovos larvados de T. canis, por via oral. Outro grupo, constituído por 12 animais, seis de cada sexo, serviu como controle. Nos dias sete, 15, 30, 60, 120 e 180 pós-infecção, foi realizada, em cada momento, a eutanásia de quatro animais de cada um dos grupos experimentais e dois do grupo controle. Amostras de sangue foram colhidas por punção da veia cava caudal. Os picos de atividade das enzimas avaliadas nos animais infectados com 250 ovos antecederam aqueles dos animais que receberam 1000 ovos. Pode-se concluir que quanto menor a carga infectante mais rápida é a elevação de atividade das enzimas utilizadas como marcadores cardíacos e as alterações são mais precoces em outros tecidos, quando comparadas à musculatura cardíaca.

Made available in DSpace on 2016-07-18T17:53:07Z (GMT). No. of bitstreams: 1 Dissertacao.pdf: 208468 bytes, checksum: 9493c81d791b19a0b7ecb64fc69e95f8 (MD5) Previous issue date: 2010-06-21 / With the aim of studying the changes promoted by larvae of Toxocara canis on the cardiac enzymes creatine kinase (CK), creatine kinase MB fraction (CK-MB) and lactate dehydrogenase (LDH) from rats three months old, according to load infective and time, two groups were formed with 24 animals, 12 males and 12 females per group. The animals received 250 (Group I) and 1000 (Group II) eggs larvae of T. canis, orally. Another group, consisting of 12 animals, six of each sex served as controls. On day seven, 15, 30, 60, 120 and 180 post-infection was performed in each moment, the euthanasia of four animals from each of the two experimental groups and control group. Blood samples were collected by puncturing the caudal vena cava. The peaks of enzyme activity measured in animals infected with 250 eggs preceded those of animals that received 1000 eggs. It can be concluded that the lower the infective load faster is to increase the activity of enzymes used as markers and cardiac changes are more precocious in other tissues as compared to the heart muscle. / Com o objetivo de estudar as alterações promovidas por larvas de Toxocara canis sobre as enzimas cardíacas creatinoquinase (CK), creatinoquinase fração MB (CK-MB) e lactato desidrogenase (LDH) de ratos Wistar de três meses de idade, em função da carga infectante e do tempo, foram formados dois grupos com 24 animais, 12 machos e 12 fêmeas por grupo. Os animais receberam 250 (Grupo I) e 1000 (Grupo II) ovos larvados de T. canis, por via oral. Outro grupo, constituído por 12 animais, seis de cada sexo, serviu como controle. Nos dias sete, 15, 30, 60, 120 e 180 pós-infecção, foi realizada, em cada momento, a eutanásia de quatro animais de cada um dos grupos experimentais e dois do grupo controle. Amostras de sangue foram colhidas por punção da veia cava caudal. Os picos de atividade das enzimas avaliadas nos animais infectados com 250 ovos antecederam aqueles dos animais que receberam 1000 ovos. Pode-se concluir que quanto menor a carga infectante mais rápida é a elevação de atividade das enzimas utilizadas como marcadores cardíacos e as alterações são mais precoces em outros tecidos, quando comparadas à musculatura cardíaca.