Acta Vet. Brno 2020, 89: 239-246

Effects of time and temperature on blood gas and electrolytes in equine venous blood

José Dantas Ribeiro Filho1, Paulo Vinícius de Morais Santos1, Samuel Rodrigues Alves1, Lorena Chaves Monteiro1, Caio Monteiro Costa1, Rinaldo Batista Viana2, Marcel Ferreira Bastos Avanza1, Waleska de Melo Ferreira Dantas3, Micheline Ozana da Silva1

1Universidade Federal de Viçosa (UFV), Department of Veterinary, Viçosa, MG, Brazil
2Universidade Federal Rural da Amazônia (UFRA), Belém, PA, Brazil
3Centro Universitário de Viçosa (Univiçosa), Viçosa, MG, Brazil

Received December 2, 2019
Accepted September 14, 2020

This study aimed to evaluate the viability time of horse venous blood samples kept at laboratory temperature (LT) and in water with ice (WI), to perform blood gas analysis. Eleven blood samples were collected in duplicates from 10 healthy horses. The samples were transported to the laboratory and subjected to one of the 24 h storage method. Each pair of syringes was distinctly kept at LT or submerged in WI. Blood gas tests were performed at times T0h, T1h, T2h, T3h, T4h, T5h, T6h, T8h, T10h, T12h and T24h after collection. Analyses of electrolytes were also performed from the same samples. A difference in blood pH was found between the treatments (P < 0.05). From T4h, pH decreased in samples kept at LT, but in WI, pH did not change. For partial pressure of carbon dioxide (pCO2), a difference between treatments (P < 0.05) was noted starting at T8h. In samples kept at LT, pCO2 increased; no changes occurred in samples stored in WI. There was a decrease in the base concentration beginning at T5h in samples kept at LT (P < 0.05), but no variation in samples kept in WI. These changes can be attributed to the erythrocyte metabolism, still active in vitro, which generates lactic acid from anaerobic glycolysis. The potassium concentration increased in samples kept in WI from T4h, with a gradual increase until T24h. Conservation of equine venous blood samples in WI is efficient in reducing cellular metabolism, thereby increasing the viability of samples for examination and interpretation of results.


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