Abstract

BERMUDEZ-DUARTE, P.M.  and  DALMAU-BARROS, E.A.. Interpretation of arterial gases in canines with respiratory pathologies. Rev. vet. [online]. 2024, vol.35, n.1, pp.79-92. ISSN 1669-6840.  http://dx.doi.org/10.30972/vet.3517485.

16.

Measurement of arterial gases is a useful diagnostic tool for evaluating pulmonary function in terms of oxygen and carbon dioxide exchange between alveoli and blood capillaries. Therefore, it is essential for the management of dogs with respiratory dysfunction. The interpretation of arterial oxygen pressure and arterial carbon dioxide pressure allows the identification of oxygenation and ventilation failures. To estimate the mechanism underlying hypoxia and, therefore, the prognosis of the condition, the alveolar-arterial gradient should preferably be calculated before oxygen therapy. Meanwhile, to evaluate the degree of severity of pulmonary dysfunction in a patient subjected to inspired oxygen fractions higher than 21%, as well as the response to oxygen therapy, it is useful to monitor the PaO2/FiO2 ratio. SaO2/FiO2 and SpO2/FiO2 ratios are diagnostic resources that are currently being investigated as indicators of oxygenation failure, with promising preliminary results in dogs. This review aims to concisely present the current application of these indicators in evaluating pulmonary function in canines with primary or secondary respiratory tract pathologies.

Keywords : PaO₂; PaCO₂; oxygenation and ventilation; dogs.

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