A Program to Calculate Mixed Venous Oxygen Tension - a Guide to Transfusion?
Though it is generally accepted that venous blood oxygen tension (PO2) reflects (but does not measure) PO2 of the tissue from which it is issuing, it is generally impractical, except under unusual circumstances, to monitor PO2 in venous blood draining from individual tissues or organs. Hence, the mixed venous PO2 (PvO2) is usually taken as an acceptable estimator of the oxygen delivery/consumption ratio in the whole body and is used as a guide to the oxygenation status of the whole body. It would be logical therefore to use PvO2 as an indication for the need for blood transfusion during surgical procedures and in the trauma situation.
KeywordsTransfusion Trigger Oxyhemoglobin Dissociation Curve Percent Confidence Limit Isovolemic Hemodilution Cardiac outputS
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