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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, slow aspiration from the distal lumen of a catheter placed in the pulmonary artery can provide a sample of mixed venous blood. The oxygen saturation of such a sample (S[unk]O₂) is dependent on arterial oxygen saturation, hemoglobin concentration, cardiac output, and tissue oxygen demands. A fall in S[unk]O₂ usually implies anemia, arterial oxygen desaturation, and/or decreased cardiac output; however, a normal or high value does not exclude such disturbances. When employed in conjunction with the other indicators of tissue oxygenation available in an intensive care unit, S[unk]O₂ can be useful as a guide for both prognosis and urgency 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 University Ave, Toronto, Ontario, Canada M5G 1x5 (Dr Aberman).

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