Der Anaesthesist
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Review Comparative Study
[The meaningfulness of central venous blood samples. Central venous versus mixed venous O2 status].
Both mixed-venous and "central-venous" oxygen status (O2 partial pressure [pO2], O2 saturation [sO2], O2 concentration [cO2], hemoglobin concentration [cHb]) are often considered to adequately represent total-body oxygen supply. Since modern technology has made continuously in vivo measurement possible, mixed-venous O2 saturation (svO2) and partial O2 saturation (psO2) have become extensively used for that purpose. Both venous sites of measurement are used as diagnostic adjuncts regarding hemodynamic status. ⋯ The best parameters for interpreting the cardiovascular situation seem to be arteriovenous O2 difference (avDO2) and C. O. In particular, the avDO2 can be accepted as an integrating parameter for AO2 and QO2, and may therefore serve as a diagnostic indication of cardiovascular imbalance.