Fig 4.
Line plots of (A) cerebral blood flow, (B) cerebral metabolic rate of oxygen, (C) oxygen extraction fraction, (D) bispectral index, (E) regional cerebral oxygen saturation, (F) arterial oxygen tension, and (G) arterial carbon dioxide tension stratified according to the region of interest (peritumoral area vs. contralateral hemisphere) and the study medication (phenylephrine vs. ephedrine). Measurements were performed before treatment (pre) and during the administration of the vasopressor posttreatment (post). Each line plot consists of measurements from 12 patients (shown in gray). The mean for each parameter is shown in blue for phenylephrine and red for ephedrine. Statistically significant differences between the groups are marked with an asterisk (*).