Preoperative cerebral oxygenation in high-risk noncardiac surgical patients: an observational study on postoperative mortality and complications.

We were able to demonstrate the effect of body position on rScO2 in a subgroup analysis and found a highly significant raise of rScO2 following the change from a seated to a supine position and consistent with previous studies a close correlation between the baseline rScO2 values and preoperative hemoglobin concentration indicating that NIRS is sensitive to hemoglobin values [ 22 ].

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