American journal of critical care : an official publication, American Association of Critical-Care Nurses
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Am. J. Crit. Care
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Randomized Controlled Trial
Speed of blood withdrawal and accurate measurement of oxygen content in mixed venous blood.
Measurement of mixed venous oxygen saturation helps determine whether cardiac output and oxygen delivery are sufficient for metabolic needs. As recommended by the American Association of Critical-Care Nurses guideline, blood samples for determining mixed venous oxygen saturation are obtained by slowly, in 1 to 2 minutes, withdrawing 1.5 mL of blood from the distal port of the pulmonary artery catheter. In theory, the negative force of rapid withdrawal could pull oxygenated blood from the pulmonary capillary bed, causing falsely elevated saturation values. ⋯ Rapid blood sampling does not falsely elevate measurements of mixed venous oxygen saturation.