tempo de viabilidade de amostras de sangue venoso bovino destinadas ao exame hemogasomÉtrico, quando mantidas sob conservaÇÃo em Água gelada viability time of blood gas analysis in bovine venous blood samples stored in ice water bath

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ID: 195060
2001
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Abstract
Com o objetivo de verificar o tempo de viabilidade de amostras de sangue venoso bovino destinadas ao exame hemogasométrico, quando conservadas em banho de água gelada, selecionaram-se 14 bovinos (7 machos e 7 fêmeas), clinicamente sadios, entre 1 e 5 anos de idade. Colheram-se, de cada animal, 2 amostras de sangue (10ml cada), por punção da veia jugular, com o emprego de seringas plásticas contendo cerca de 1.000UI de heparina sódica, tomando-se os cuidados de eliminar quaisquer bolhas de gás presentes, e de manter vedada a extremidade da agulha com rolha de borracha. Cada uma do par de seringas foi mantida, distintamente, à temperatura ambiente (entre 23 e 30ºC) ou submersa em água gelada (entre zero e 4ºC). As determinações do pH, pressões parciais venosas de dióxido de carbono (PvCO2) e de oxigênio (PvO2), bicarbonato (HCO3-), total de dióxido de carbono (TCO2), excesso ou déficit de bases (BE), bicarbonato padrão (StB), saturação de oxigênio (SatO2) e do conteúdo de oxigênio (O2) foram realizadas imediatamente e com 1, 2, 3, 4, 5, 6, 8, 10, 12 e 24 horas após a colheita. Em cada um dos critérios de manutenção do material, os resultados foram avaliados por meio da análise de variância de medidas repetidas. Consideradas as diferenças entre os valores médios obtidos em cada tempo e aquele da avaliação inicial, os resultados indicaram que as alterações "in vitro" das amostras não conservadas já eram marcantes a partir de 2 ou 3 horas, caracterizando-se por reduções contínuas do pH, PvO2, BE, StB, Sat O2 e O2, e por elevação gradativa da PvCO2. No sangue conservado, ao contrário, o valor de pH não exibiu diferença do original durante as primeiras 4 horas, e os de PvCO2, BE e StB mantiveram-se inalterados por até 6 horas após a colheita. A análise dos resultados permitiu concluir que as amostras de sangue venoso bovino destinadas ao exame de hemogasometria podem permanecer viáveis por até 6 horas, quando adequadamente conservadas em banho de água gelada, mantendo, assim, o seu valor diagnóstico.
In order to verify the viability of blood gas analysis in bovine venous blood stored on ice water bath, two samples (10ml each) were taken from the jugular vein of 14 healthy animals (7 males and 7 females), 1- to 5-year-old, using plastic syringes and attached needles filled with sodium heparin (1,000IU). The blood samples were obtained anaerobically, the air bubbles observed were immediately removed, and the needle was maintened capped with a rubber stopper. Each syringe of the pair was distinctally stored at room temperature (23-30ºC) or in ice water bath (0-4ºC) during the experimental period. Values of pH, carbon dioxide (PvCO2) and oxigen (PvO2) tensions, bicarbonate (HCO3-), total carbon dioxide (TCO2), base excess (BE), standard bicarbonate (StB), oxigen saturation (SatO2), and oxigen content (O2) were determined soon after sampling and after 1, 2, 3, 4, 5, 6, 8, 10, 12 and 24 hours. According to the type of storage temperature, the results were analysed through repeated measurements ANOVA, considering the contrast between the mean value of each time and the initial one. On the storage at room temperature, the in vitro changes were characterized from continuous decreases in pH, PvO2, BE, StB, SatO2, and O2 values, and gradual increase in PvCO2, starting at 2- or 3-hour after the collection. In the samples stored at 0-4ºC, on the other hand, the changes in pH occurred only at the 4th hour, and the stability of the PvCO2, BE, and StB values were maintened for up to the 6th hour. These results indicated that the diagnostic utility of blood gas analysis is conserved in bovine venous blood samples adequately stored up to 6 hours in ice water bath, at 0-4ºC.
Reference Key
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Authors ;Júlio Augusto Naylor Lisbôa;Fernando José Benesi;Celso Akio Maruta;Regina Mieko Sakata Mirandola;Cynthia Maria Carpigiani Teixeira
Journal Trials
Year 2001
DOI
10.1590/S0103-84782001000200013
URL
http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-84782001000200013
Keywords
storage blood gas analysis bovinos cattleagricultureagriculture (general) venous blood

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