Fig. 7. Scattergrams of regional cerebral metabolic rate of oxygen (rCMRO2) versus blood flow (rCBF) at baseline and during the four anesthetic regimens. Data from all regions of interest and subregions of interest of both hemispheres are included. Only as a descriptive measure (several samples from each subject), the regression lines are also given. P+N = propofol plus nitrous oxide; S+N = sevoflurane plus nitrous oxide.