Accuracy of a Portable Blood Gas Analyzer Incorporating Optodes for Canine Blood

摘要

The accuracy of a portable blood gas analyzer (OPTI 1) was evaluated using canine blood and aqueous control solutions. Sixty-four arterial blood samples were collected from 11 anesthetized dogs and were analyzed for pH, partial pressure of carbon dioxide (Pco ₂ ), partial pressure of oxygen (Po ₂ ), and bicarbonate concentration ([HCO ₃ -]) values by the OPTI 1 and a conventional blood gas analyzer (GASTAT 3). The conventional analyzer was considered as a standard against which the OPTI 1 was evaluated. Comparison of OPTI 1 results with those of GASTAT 3 by linear regression analysis revealed a high degree of correlation with the GASTAT 3 ( r = .90-.91). The mean ± SD of the differences between OPTI 1 and GASTAT 3 values was -0.008 ± 0.017 for pH, -0.88 ± 3.33 mm Hg for Pco ₂ , 3.71 ± 6.98 mm Hg for Po ₂ , and -0.34 ± 1.45 mEq/L for [HCO ₃ -]. No statistically significant difference was found between the OPTI 1 and the GASTAT 3. Agreement between these 2 methods is within clinically acceptable ranges for pH, Pco ₂ , Po ₂ , and [HCO ₃ -]. The coefficients of variation for measured pH, Pco ₂ , and Po ₂ values of 3 aqueous control solutions (acidic, normal, and alkalotic) analyzed by the OPTI 1 ranged from 0.047 to 0.072% for pH, 0.78 to 1.81% for Pco ₂ , and 0.73 to 2.77% for Po ₂ . The OPTI 1 is concluded to provide canine blood gas analysis with an accuracy that is comparable with that of conventional benchtop blood gas analyzers.