The Clinical Value Of Arterial And Venous Blood Gas Analysis

ObjectiveTo compare the difference between the venous serum and arterial blood electrolytes, the venous serum and venous blood electrolytes, the arterial and venous blood gas analysis results, respectively, to analyze the internal association, and to explore the relevant clinical application value.MethodThis is a prospective, randomized controlled trial, which performed in60patients undergoing schelduled surgery in our hospital between January20,2013and January25,2014. The peripheral arterial and central venous blood sample were taken simultaneously in peri anesthesia period. The aterial blood, venous blood and venous serum sample were tested by the blood gas analyzer seperately. To compare the difference in electrolytes between the arterial blood and venous serum, the venous serum and venous blood. To analyze the correlations of the testing results between two kinds of blood sample by drawing scatterplots, and to calculate the correlation coefficient. Eventually, carry on linear regression analysis to establish the regressive equation. To compare the difference in parameters of oxygenation, acid-base, electrolytes and glucose between the arterial and venous blood, and to investigate its clinical significance.ResultThe results of Na+, K+, Ca2+in arterial blood and venous serum are statistically significant(P=0.000). Both Na+, K+results between arterial blood and venous serum were positively correlated, with the respective correlation coefficience R of0.850and0.880. Regression equations were venous serum Na+(mmol/L)=0.814×arterial blood Na++24.282, venous serum K+(mmol/L)=0.863×arterial blood K++0.773. The results of Na+, K+, Ca2+in venous blood and venous serum are statistically significant(P=0.000). Both Na+, K+results between venous blood and venous serum were positively correlated, with the respective correlation coefficience R of0.796and0.902. Regression equations were venous serum Na+(mmol/L)=0.645×venous blood Na++47.598, venous serum K+(mmol/L)=0.926×venous blood K++0.613. The difference in pH between arterial blood and venous blood (AVpH) is about0.05(95%confidence interval,0.04~0.06). The difference in PCO2between arterial blood and venous blood (VAPCO2) is about7.4mmHg (95%confidence interval,6.4~8.4mmHg). There was no obvious difference in BE, Hb, Hct between the arterial blood and venous blood; The electrolytes results has no obvious clinical significance; The venous blood glucose was significantly lower than that of the arterial blood (P=0.000).ConclusionThere were significant differences in Na+, K+, Ca2+between arterial blood and venous serum. And the concentration of Na+, K+in venous serum can be calculated by the regression equation with the results of arterial blood. Difference in Na+, K+, Ca2+also have statistically significant between venous serum and venous blood. The concentration of Na+, K+in venous serum can be calculated by the regression equation with the results of venous blood. Generally, the difference in pH and PCO2between arterial blood and venous blood fluctuates in a certain range. Parameters of BE, Hb, Hct and electrolytes do not have significant differences, while the glucose have, to the contrary.