Mixed Venous Oxygen Saturation: Its Role in the Assessment of the Critically Ill Patient

doi:10.1001/archinte.1983.00350070120019

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Vol. 143 No. 7, July 1983

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CRITICAL CARE MEDICINE

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Mixed Venous Oxygen Saturation

Its Role in the Assessment of the Critically Ill Patient

Gabor Kandel, MD, FRCP(C); Arnold Aberman, MD, FRCP(C), FACP

Arch Intern Med. 1983;143(7):1400-1402.

Abstract

• Except In the presence of left to right shunts, slowaspiration from the distal lumen of a catheter placed in thepulmonary artery can provide a sample of mixed venous blood.The oxygen saturation of such a sample (S[unk]O₂) is dependenton arterial oxygen saturation, hemoglobin concentration, cardiacoutput, and tissue oxygen demands. A fall in S[unk]O₂ usuallyimplies anemia, arterial oxygen desaturation, and/or decreasedcardiac output; however, a normal or high value does not excludesuch disturbances. When employed in conjunction with the otherindicators of tissue oxygenation available in an intensive careunit, S[unk]O₂ can be useful as a guide for both prognosis andurgency of therapy.

(Arch Intern Med 1983;143:1400-1402)

Author Affiliations

From Mount Sinai Hospital (Drs Kandel and Aberman) and the University of Toronto (Dr Aberman).

Footnotes

Accepted for publication Jan 3, 1983.

Reprint requests to Suite 427, Mount Sinai Hospital, 600 UniversityAve, Toronto, Ontario, Canada M5G 1x5 (Dr Aberman).

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