Fig. 3.

CBF tends to correlate with CPP in poor-grade patients. The CBF of early CTP did not correlate significantly with the CPP in the subgroup of patients with good WNFS grade aSAH (n = 16; R =  − 0.47, 95% CI − 1.5 to 0.6, p = 0.35; Fig. 3, blue). Poor WFNS grade patients (n = 40) showed a stronger, yet also nonsignificant, correlation of CBF with CPP (R = 1.25, 95% CI − 0.3 to 2.8, p = 0.12; Fig. 3, red). Outliers were excluded for better graphical presentation. aSAH, aneurysmal subarachnoid hemorrhage, CBF, cerebral blood flow, CI, confidence interval, CPP, cerebral perfusion pressure, CTP, computed tomography perfusion, WNFS, World Federation of Neurosurgical Societies (Color figure online)