Oxygen saturation in intraosseous sternal blood measured by CO-oximetry and evaluated non-invasively during hypovolaemia and hypoxia - a porcine experimental study.

Sternal blood has an oxygen saturation suggesting a mixture of venous and arterial blood. Changes in SsO relate well with changes in SvO during hypovolaemia or hypoxia. Further studies on the feasibility of using non-invasive measurement of changes in SsO to estimate changes in SvO are warranted.