Key result
Superior vena cava oxygen saturation and mixed venous oxygen saturation should be evaluated as a range of values rather than a single measurement to guide clinical decisions in critically ill patients.
Why the study?
Whether superior vena cava oxygen saturation can replace traditional mixed venous oxygen saturation remains controversial.
Answers are grounded in this paper and cite their sources.
This review highlights the ongoing debate between using central versus mixed venous oxygen saturation and emphasizes that clinical decisions in critically ill patients require a comprehensive assessment rather than reliance on a single saturation value.
Venous oxygen saturation has been traditionally used as a marker for tissue hypoxia. A wide range of factors can affect it. Literature abounds with articles on the use of the same in decision making and clinical management of patients in shock. Likewise, the application of venous saturation in patients undergoing cardiac and noncardiac surgery has been demonstrated. The controversy as to whether superior vena cava oxygen saturation can replace the traditional mixed venous oxygen saturation is never ending. Irrespective of the body of evidence, it is recommended that clinical decision should not be based on a single value, and a range of values needs to be incorporated to differentiate a critically ill from a noncritically ill patient.
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Agarwal et al. (2018) conducted a review in Tissue hypoxia and shock. Superior vena cava oxygen saturation vs. Mixed venous oxygen saturation was evaluated. Superior vena cava oxygen saturation and mixed venous oxygen saturation should be evaluated as a range of values rather than a single measurement to guide clinical decisions in critically ill patients.
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