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Avaliação ecocardiográfica em bezerros da raça Holandesa Echocardiographic evaluation in Holstein calves

By Lilian E.S. Michima, Marta L.R. Leal, Heloísa G. Bertagnon, Wilson R. Fernandes and Fernando J. Benesi

Abstract

Com o objetivo de estabelecer valores de medidas ecocardiográficas em bezerros da raça Holandesa, utilizaram-se 25 animais, com idade entre 8 e 28 dias e peso entre 27 e 57 kg. Procedeu-se o exame ecocardiográfico em modo-B e modo-M para a obtenção dos valores médios dos seguintes parâmetros, em diástole e sístole, respectivamente: diâmetros internos dos ventrículos direito (2,05&plusmn;0,13cm e 1,59&plusmn;0,13cm) e esquerdo (3,91&plusmn;0,09cm e 2,52&plusmn;0,13cm), espessuras do septo interventricular (1,24&plusmn;0,04cm e 1,62&plusmn;0,06cm) e da parede livre do ventrículo esquerdo (0,92&plusmn;0,04cm e 1,50&plusmn;0,05cm). Obtiveram-se ainda valores do diâmetro dos átrios direito e esquerdo em sístole (2,97&plusmn;0,12cm e 4,11&plusmn;0,21cm, respectivamente), dos volumes diastólico (67,90&plusmn;3,65ml), sistólico (25,32&plusmn;3,05ml) e de ejeção (42,58&plusmn;2,46ml) do ventrículo esquerdo, do débito cardíaco (3857&plusmn;339ml/min), do diâmetro aórtico (2,52&plusmn;0,05cm), da distância entre o ponto de maior abertura do folheto anterior da valva atrioventricular esquerda até o septo interventricular (0,65&plusmn;0,08cm) e tempo de ejeção (0,39&plusmn;0,02s), das frações de encurtamento (36,27&plusmn;2,40%) e de ejeção do ventrículo esquerdo (64,67&plusmn;3,22%). Houve média correlação linear positiva (66,4%, P<0,01) entre diâmetro aórtico e peso dos animais, média correlação linear negativa (P<0,01) entre tempo de ejeção do ventrículo esquerdo e freqüência cardíaca (69,1%) e com o débito cardíaco (62,4%). Observou-se uma tendência dos bezerros em apresentar menor diâmetro da câmara cardíaca esquerda, apesar de mantidas as relações de espessura de parede e índices funcionais do miocárdio.<br>With the purpose of establishing echocardiographic measurements in Holstein calves, 25 calves, 8 to 28 days of age and body weight ranging from 27 to 57 kg, were used. The echocardiographic examination was proceeded in B and M-modes to obtain the following parameters, in diastole and systole: right ventricle (2.05&plusmn;0.13cm and 1.59&plusmn;0.13cm) and left ventricle internal diameter (3.91&plusmn;0.09cm and 2.52&plusmn;0.13cm), and interventricular septum (1.24&plusmn;0.04cm and 1.62&plusmn;0.06cm) and left ventricle free wall thickness (0.92&plusmn;0.04cm and 1.50&plusmn;0.05cm). The values for both left and right atria in systole were 2.97&plusmn;0.12cm and 4.110.21cm, respectively. The left diastolic (67.90&plusmn;3.65ml), systolic (25.32&plusmn;3.05ml) and ejection (42.58&plusmn;2.46ml) volumes, cardiac output (3857&plusmn;339ml/min), aortic root diameter (2.52&plusmn;0.05cm), E-point septal separation (0.65&plusmn;0.08cm), left ventricle ejection time (0.39&plusmn;0.02s), fractional shortening (36.27&plusmn;2.40%) and ejection fraction (64.67&plusmn;3.22%) were also calculated. There was a mean positive linear correlation (66.4%, P<0.01) between the aortic root diameter and the bodyweight, mean negative linear correlation (P<0.01) heart rate (69.1%) and cardiac output (62.4%). There was a tendency of the calves in between the left ventricle ejection time and presenting a smaller left chamber diameter, although maintained the relationship between myocardial wall thickness and functional indexes

Topics: Ecocardiografia, índices cardíacos, bezerro, Echocardiography, cardiac indexes, calf, Animal culture, SF1-1100, Agriculture, S, DOAJ:Animal Sciences, DOAJ:Agriculture and Food Sciences, Veterinary medicine, SF600-1100
Publisher: Colégio Brasileiro de Patologia Animal (CBPA)
Year: 2007
DOI identifier: 10.1590/S0100-736X2007001200002
OAI identifier: oai:doaj.org/article:2c5fe9321a6c4de9b13adabbd02de31d
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