Purpose:To investigate the effects of blood storage in biochemical and arterial blood gas analysis of Wistar rats. Methods: Ten adult male rats with weights between 300-350 g were used. The catheterization of the internal carotid artery were performed, followed by withdrawal of 3 ml of blood using 3 separate syringes each containing 1 ml. The syringes were fulfilled one after another and numerated according to the order of collection. Then, the following groups were devised: GT1 -samples that were firstly analyzed in 20 minutes and the second exam 65 minutes after the collection; GT2 -samples that were firstly analyzed in 35 minutes and the second exam 80 minutes after the collection; GT3 -samples that were firstly analyzed in 50 minutes and the second exam 95 minutes after the collection. The samples were stored in a container with a temperature between 0 Cº and 4 Cº. Upon analysis the values of pH, PaCO 2 , PaO 2 , HCO 3 -, SatO 2 , SBE, Na + and K + concentrations and glucose were compared. Results: No statistically relevant difference (p<0.05) between the GT1, GT2 or GT3, when measuring pH, PaCO 2 , PaO 2 , HCO 3 -, SatO 2 , SBE or glucose, were found. However, Na + concentration decreased and the K + concentration increased (p<0.05) when comparing the first analysis (20 minutes) with the last one (95 minutes).
Conclusion:The blood storage on ice does not interfere in the results of arterial blood gas analysis for the period of at least 95 minutes, except for the Na + e K + levels, which are practicable until 80 minutes after storage. Key words: Blood Preservation. Blood Gas Analysis. Rats.
RESUMO
Objetivo:Analisar o efeito da estocagem sanguínea na bioquímica e na gasometria do sangue arterial de ratos Wistar. Métodos: Foram utilizados 10 ratos adultos, machos, com peso compreendido entre 300 a 350 gramas. Cada animal foi submetido à cateterização da artéria carótida seguida de heparinização prévia do animal. Foram colhidos 3 ml de sangue total do rato, separados em três seringas contendo 1 ml cada. As seringas foram preenchidas uma após a outra e enumeradas respectivamente à ordem de coleta. De acordo com esta numeração as amostras foram distribuídas nos seguintes grupos: GT1 -amostras que tiveram primeira análise em 20 minutos e a segunda análise 65 minutos após a coleta; GT2 -amostras que tiveram primeira análise em 35 minutos e segunda análise 80 minutos após a coleta; GT3 -amostras que tiveram primeira análise em 50 minutos e 95 minutos após a coleta. As amostras foram estocadas em material isolante térmico, com temperatura entre 0 Cº e 4 Cº.