FIGURE 2.

Cerebral ischemia. Computed tomography, cerebral blood flow, cerebral metabolic rate of oxygen, oxygen extraction fraction, ischemic brain volume (IBV) and PET ¹⁸F-fluorodeoxyglucose kinetic parameters for K₁ (glucose delivery) and k₃ (glycolysis) obtained in a 40-year-old female within 24 h of severe traumatic brain injury resulting from a fall. The computed tomography scan was obtained following evacuation of a subdural hematoma and demonstrates residual subdural blood with minimal midline shift and underlying hemorrhagic contusions. Cerebral blood flow, cerebral metabolic rate of oxygen and (K₁) glucose delivery are reduced, whereas oxygen extraction fraction and k₃ (glycolysis) are increased within the hemisphere underlying the subdural. These findings are consistent with classical ischemia.