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Ann Thorac Surg 1987;44:260-262
© 1987 The Society of Thoracic Surgeons

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Articles

Mixed Venous Oxygen Saturation as a Predictor of Cardiac Output in the Postoperative Cardiac Surgical Patient

Division of Cardiac and Thoracic Surgery, Henry Ford Hospital, Detroit, MI

Accepted for publication February 6, 1987.

^* Address reprint requests to Dr. Magilligan, Division of Cardiac and Thoracic Surgery, Henry Ford Hospital, 2799 W Grand Blvd, Detroit, MI 48202.

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 < .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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