[Concordance between central venous and arterial blood gases in post-surgical myocardial revascularization patients in stable condition]

Abstract

Objective: The concordance between the parameters of arterial and central venous blood gases has not been defined yet. We studied the concordance between both parameters in post-surgical myocardial revascularization patients in stable condition.

Methods: Consecutive subjects were studied in a cross-sectional design. The position of the central venous catheter was performed and simultaneously we obtained arterial and central venous blood samples prior to discharge from the intensive care unit. Data are expressed according to Bland-Altman statistical method and the intraclass correlation coefficient. Statistical result was accepted at P<.05.

Results: Two hundred and six samples were studied of 103 post-surgical patients, pH and lactate had a mean difference (limits of agreement) 0.029±0.048 (-0018, 0.077) and -0.12±0.22 (-0.57, 0.33) respectively. The magnitude of the intraclass correlation coefficient was 0.904 and 0.943 respectively. The values related to oxygen pressure were 27.86±6.08 (15.9, 39.8) and oxygen saturation 33.02±6.13 (21, 45), with magnitude of 0.258 and 0.418 respectively.

Conclusion: The best matching parameters between arterial and central venous blood samples were pH and lactate.

Keywords: Acuerdo; Agreement; Cardiac surgery; Cirugía cardiaca; Confiabilidad; Confiability; Fiabilidad; Fiability; Mexico; México; Repetibilidad; Repetibility.