Article Figures & Data
Figures
- Fig 1.
Patient who underwent hemicraniectomy after head trauma.
A, Nonenhanced CT scan shows the tip of the brain-tissue oxygen probe as a white linear attenuation in the right hemispheric white matter. Midline white attenuation is a ventriculostomy catheter. Yellow circle indicates the ROI for CTP analysis.
B, CTP color map of MTT. On the reference bar, blue indicates the slowest MTT. Arrow points to the tip of the oxygen probe. Overall, MTT is decreased on the side of hemicraniectomy, indicating more rapid transit. Surrounding blue rim represents scalp perfusion.
- Fig 2.
Plots of PbrO2.
A, PbrO2 is inversely and significantly correlated with MTT (P = .017).
B and C, PbrO2 is not significantly related to CBV or CBF.
Tables
Variable Value Mean arterial pressure (mm Hg) 98 ± 12 Intracranial pressure (mm Hg) 15 ± 6 Cerebral perfusion pressure (mm Hg) 83 ± 11 FiO2 0.41 ± 0.12 PbrO2 (mm Hg) 27.6 ± 13.3 Mean Transit Time (second) 3.83 ± 1.09 CBV (mL/100 g) 3.94 ± 1.95 CBF (mL/100 g/min) 59.7 ± 38.1 Note.—Data are the mean ± standard deviation.
Parameter Coefficient* 95% Confidence Interval P Value PbrO2 (mm Hg) −0.42 −0.72, −0.12 .006 FiO2 0.42 −4.18, 42.6 .98 Cerebral perfusion pressure (mm Hg) 0.04 −0.38, 0.46 .85 * Expressed per 10-mm Hg change in PbrO2 and cerebral perfusion pressure and per 0.10 change in FiO2.
