Encyclopedia of Intensive Care Medicine

2012 Edition
| Editors: Jean-Louis Vincent, Jesse B. Hall

Venous Oxygen Saturation, Central and Mixed

Reference work entry
DOI: https://doi.org/10.1007/978-3-642-00418-6_220
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Synonyms

 ScvO2 (central venous oxygen saturation);  SvO2 (mixed venous oxygen saturation);  Venous oximetry

Definition

Mixed venous oxygen saturation is the oxygen saturation measured in the blood taken from the pulmonary artery. In general, a pulmonary artery catheter is necessary to measure SvO2. The term “mixed” refers to the fact that the pulmonary artery carries the venous blood from the whole body as a mix of the blood from the inferior and superior vena cava. In contrast, the central venous oxygen saturation is measured in the blood taken from the superior vena cava usually via a central venous catheter, thus, reflecting venous blood from the upper body only.

Pre-existing Condition

Venous oximetry is applied to monitor the adequacy of tissue oxygenation. This indication is derived from the Fick principle, where O2 consumption is equal to the product of cardiac output and the arteriovenous O2 content difference. When the equation is solved for SvO2, this parameter is...

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References

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Copyright information

© Springer-Verlag Berlin Heidelberg 2012

Authors and Affiliations

  1. 1.Department of Anesthesiology and Intensive Care MedicineJena University HospitalJenaGermany