Table 2.

Secondary cerebral injury definitions

	Definition
Hypoxemia	Oxygen saturation<90% for ≥ 5 min on pulse oxymetry
Hypotension	Systolic blood pressure<90 mm Hg for≥5 min
Intracranial hypertension	Intracranial pressure>25 mm Hg for≥5 min
Brain tissue hypoxia	Brain tissue oxygen tension(PbtO2)< 15 mm Hg for≥5 min or Brain tissue oxygen saturation(SbtO2)> 20% below baseline for≥5 min or SbtO2<60% for ≥ 5 min