A patient suffering from traumatic brain injury in the ICU has a PtO2 (tissue oxygen) value of 10 to 15 mm Hg, what does this indicate?
a. Normal intracranial pressure
b. Ischemic brain damage
c. Normal cerebral perfusion
d. Cerebral hyperperfusion
ANS: B
In patients with traumatic brain injury, brain tissue oxygen (PtO2) values when intracranial pres-sure and cerebral perfusion are normal are between 25 and 30 mm Hg. The critical threshold for ischemic brain damage and poor outcome is suspected to be around a brain PtO2 of 10 to 15 mm Hg.
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