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Background: Adequate monitoring of the hemodynamic state is essential after cardiac surgery and is vital for medical decision making, particularly concerning hemodynamic management. Unfortunately, commonly used methods to assess the hemodynamic state are not well documented with regard to outcome. Mixed venous oxygen saturation (SvO₂) was therefore investigated after cardiac surgery.

Methods: Detailed data regarding mortality were available on all patients undergoing aortic valve replacement for isolated aortic stenosis during a 5‐year period in the southeast region of Sweden (n=396). SvO₂ was routinely measured on admission to the intensive care unit (ICU) and registered in a database. A receiver operating characteristics (ROC) analysis of SvO₂ in relation to post‐operative mortality related to cardiac failure and all‐cause mortality within 30 days was performed.

Results: The area under the …