Fig. 2.

MTT correlates with blood pressure; the correlation increases with the severity of aSAH. A MTT of early CTP correlated significant with the MAP in the entire study population (R =  − 0.18, 95% CI − 0.34 to − 0.01, p = 0.042). B The dichotomized subgroups showed a nonsignificant correlation (R =  − 0.08, 95% CI − 0.31 to 0.16, p = 0.53; left panel) for the good WNFS grade patients and for the poor WFNS grade patients (R =  − 0.2, 95% CI − 0.42 to 0.05, p = 0.12; middle panel). However, when only patients with WFNS V are considered, there is a significant and strong correlation of MAP with MTT (R =  − 0.4, 95% CI − 0.65 to − 0.07, p = 0.02) (right panel). aSAH, aneurysmal subarachnoid hemorrhage, CI, confidence interval, CTP, computed tomography perfusion, ds, decisecond, MAP, mean arterial pressure, MTT, mean transit time, WNFS, World Federation of Neurosurgical Societies