Brain tissue oxygenation (PBtO2)

Utility
One study suggested that there was not really any correlation between brain tissue oximetry and volume of ischemic brain after TBI. This may be due to PbtO2 only being measured in one area of the brain.

Drops in PbtO2 are associated with initial lower cerebral blood flow (CBF) measurements on transcranial doppler (TCD) in patients with TBI.

Effect of RBC Transfusion
RBC transfusion increased PbtO2 by 20% in 41% of transfusion cases. High heart rate and low PbtO2 at baseline were independently associated with improvement in PbtO2.