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Alterações ecocardiográficas em gatos com hipertiroidismo
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Autores
Resumo(s)
O hipertiroidismo é a doença endócrina mais diagnosticada em gatos sendo responsável por diversos efeitos no aparelho cardiovascular, tais como a ocorrência de alterações na estrutura e função cardíacas que caracterizam a cardiomiopatia tireotóxica.
O objetivo deste estudo, realizado em gatos da área da grande Lisboa, foi determinar a prevalência de alterações ecocardiográficas em animais, com hipertiroidismo não tratado, que foram submetidos a um exame ecocardiográfico, e caracterizar epidemiologicamente esses animais.
A amostra populacional foi composta por indivíduos (n=17) com idades compreendidas entre os 12 e os 19 anos, maioritariamente machos (70,6%; IC95%: 46,9-86,7%) e quase exclusivamente de raça indeterminada (88,2%; IC95%: 65,7-96,7%).
A alteração ecocardiográfica mais frequente foi a dilatação do átrio esquerdo, presente em 52,9% (IC95%: 31,0-73,8%) dos indivíduos. A hipertrofia da parede livre do ventrículo esquerdo foi a segunda alteração mais frequente (41,2%; IC95%: 21,6-64,0%), seguida da hipertrofia do septo interventricular (17,7%; IC95%: 6,2-41,0%). Concluiu-se que 47,1% (IC95%: 26,2-69,0%) dos animais apresentou hipertrofia concêntrica do ventrículo esquerdo, sendo moderada em 62,5% (IC95%: 30,6-86,3%) e ligeira nos restantes indivíduos. A hipertrofia ventricular foi considerada simétrica em todos os animais que a exibiram. A fração de encurtamento encontrou-se diminuída apenas num indivíduo (5,9%; IC95%: 1,1-27,0%) e aumentada noutro (5,9%; IC95%: 1,1-27,0%).
ABSTRACT - Echocardiographic abnormalities in cats with hyperthyroidism - Hyperthyroidism is the most diagnosed endocrine disease in cats and is responsible for several effects on the cardiovascular system such as the occurrence of changes in cardiac structure and function that characterize thyrotoxic cardiomyopathy. The aim of this study, which was carried out in the Greater Lisbon area, was to determine the prevalence of echocardiographic abnormalities in cats with untreated hyperthyroidism that underwent an echocardiographic examination and to characterize those animals epidemiologically. The statistical sample comprised subjects (n = 17) aged between 12 and 19 years, mostly males 70.6% (95%CI: 46.9-86.7%) and almost exclusively of undetermined race (88.2%; 95%CI: 65.7-96.7%). The most frequent echocardiographic finding was the left atrial dilatation, present in 52.9% (95%CI: 31.0-73.8%) of the subjects. The left ventricular free wall hypertrophy was the second most frequent alteration (41.2%; 95%CI: 21.6-64.0%), followed by interventricular septum hypertrophy (17.7%; 95%CI: 41.0%). It was concluded that 47.1% (95%CI: 26.2-69.0%) of the cats showed concentric hypertrophy of the left ventricle, which was moderate in 62.5% (95%CI: 30.6-86.3%) and mild in the remaining subjects. Ventricular hypertrophy was considered symmetrical in all the cats that exhibited it. The shortening fraction was found decreased in only one subject (5.9%; 95%CI: 1.1-27.0%) and increased in another (5.9%; 95%CI: 1.1-27.0%).
ABSTRACT - Echocardiographic abnormalities in cats with hyperthyroidism - Hyperthyroidism is the most diagnosed endocrine disease in cats and is responsible for several effects on the cardiovascular system such as the occurrence of changes in cardiac structure and function that characterize thyrotoxic cardiomyopathy. The aim of this study, which was carried out in the Greater Lisbon area, was to determine the prevalence of echocardiographic abnormalities in cats with untreated hyperthyroidism that underwent an echocardiographic examination and to characterize those animals epidemiologically. The statistical sample comprised subjects (n = 17) aged between 12 and 19 years, mostly males 70.6% (95%CI: 46.9-86.7%) and almost exclusively of undetermined race (88.2%; 95%CI: 65.7-96.7%). The most frequent echocardiographic finding was the left atrial dilatation, present in 52.9% (95%CI: 31.0-73.8%) of the subjects. The left ventricular free wall hypertrophy was the second most frequent alteration (41.2%; 95%CI: 21.6-64.0%), followed by interventricular septum hypertrophy (17.7%; 95%CI: 41.0%). It was concluded that 47.1% (95%CI: 26.2-69.0%) of the cats showed concentric hypertrophy of the left ventricle, which was moderate in 62.5% (95%CI: 30.6-86.3%) and mild in the remaining subjects. Ventricular hypertrophy was considered symmetrical in all the cats that exhibited it. The shortening fraction was found decreased in only one subject (5.9%; 95%CI: 1.1-27.0%) and increased in another (5.9%; 95%CI: 1.1-27.0%).
Descrição
Dissertação de Mestrado Integrado em Medicina Veterinária
Palavras-chave
Hipertiroidismo Gatos Cardiomiopatia tireotóxica Ecocardiografia Hyperthyroidism Cats Thyrotoxic cardiomyopathy Echocardiography
Contexto Educativo
Citação
Lisboa, S. (2017). Alterações ecocardiográficas em gatos com hipertiroidismo. Dissertação de mestrado. Universidade de Lisboa, Faculdade de Medicina Veterinária, Lisboa.
Editora
Universidade de Lisboa, Faculdade de Medicina Veterinária