mixed venous oxygen saturation


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mixed venous oxygen saturation (SvO2 )

The balance between oxygen delivery and extraction, and a measure of the adequacy of oxygen delivery to the tissues. Tissue hypoxia may occur even when heart rate, blood pressure and central venous pressure are normal. Knowledge of the SvO2 has been shown to be valuable in any condition or state in which tissue hypoxia is possible. The normal range is 65 to 75 per cent. Unfortunately, its measurement requires a pulmonary artery catheter, the safety of which has been questioned.
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Mixed venous oxygen saturation remains constant during 0 through 45 degrees of backrest elevation.
Mixed venous oxygen saturation may decrease immediately after lateral positioning with a return to baseline within 5 minutes.
Noll ML, Fountain RL: Effect of backrest position on mixed venous oxygen saturation in patients with mechanical ventilation after coronary artery bypass surgery.
Pena MA: The effect of position change on mixed venous oxygen saturation measurements in open heart surgery patients during the immediate postoperative period.
Shively M: Effect of position change on mixed venous oxygen saturation in coronary artery bypass surgery patients.
Tidwell S, Ryan W, Osguthorpe S et al: Effects of position changes on mixed venous oxygen saturation in patients after coronary revascularization.
Continuous recordings of mixed venous oxygen saturation during weaning from mechanical ventilation and the ramifications thereof.
Lack of equivalence between central and mixed venous oxygen saturation.
Mixed venous oxygen saturation cannot be estimated by central venous oxygen saturation in septic shock.