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The Annals of Thoracic Surgery, Vol 44, 260-262, Copyright © 1987 by The Society of Thoracic Surgeons

ARTICLES

Mixed venous oxygen saturation as a predictor of cardiac output in the postoperative cardiac surgical patient

DJ Magilligan Jr, R Teasdall, R Eisinminger and E Peterson

Mixed venous oxygen saturation (SvO2) was measured continuously with a fiberoptic pulmonary artery catheter in 25 patients during the first 24 hours after cardiac surgery and was compared with the thermodilution cardiac index (CI). The mean correlation coefficient between SvO2 and CI was 0.05 +/- 0.42, and was not significantly different from zero. Although the mean correlation coefficient between the change in SvO2 and the change in CI was significant (p less than .05), the magnitude of the coefficient (0.19 +/- 0.44) indicates poor predictive value. The correlation did not improve when adjusted for multiple clinical variables, and the SvO2 was not predictive of a CI less than 2 L/min/m2, a level of cardiac performance that might require intervention. In conclusion, SvO2 was not predictive of CI postoperatively in the cardiac surgical patient.

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