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Intensive Care Medicine
Published in: Intensive Care Medicine 7/2005

01-07-2005 | Physiological Note

Venous oximetry

Authors: Frank Bloos, Konrad Reinhart

Published in: Intensive Care Medicine | Issue 7/2005

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Excerpt

The primary physiological task of the cardiovascular system is to deliver enough oxygen (O2) to meet the metabolic demands of the body. Shock and tissue hypoxia occur when the cardiorespiratory system is unable to cover metabolic demand adequately. Sustained tissue hypoxia is one of the most important cofactors in the pathophysiology of organ dysfunction [1]. Therefore determining the adequacy of tissue oxygenation in critically ill patients is central to ascertain the health of the patient. Unfortunately, normal values in blood pressure, central venous pressure, heart rate, and blood gases do not rule out tissue hypoxia or imbalances between whole-body oxygen supply and demand [2]. This discrepancy has led to increased interest in more direct indicators of adequacy of tissue oxygenation such as mixed and central venous oxygen saturations. Pulmonary artery catheterization allows obtaining true mixed venous oxygen saturation (SvO2) while measuring central venous oxygen saturation (ScvO2) via central venous catheter reflects principally the degree of oxygen extraction from the brain and the upper part of the body. This brief review discusses the role and limitations of SvO2 and ScvO2 as indicators of the adequacy of tissue oxygenation. …
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Metadata
Title
Venous oximetry
Authors
Frank Bloos
Konrad Reinhart
Publication date
01-07-2005
Publisher
Springer-Verlag
Published in
Intensive Care Medicine / Issue 7/2005
Print ISSN: 0342-4642
Electronic ISSN: 1432-1238
DOI
https://doi.org/10.1007/s00134-005-2670-9

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