Fig. 2. Absolute values of regional cerebral blood flow (rCBF; ml · 100 g−1· min−1) and blood volume (rCBV; percent) of region-of-interest (ROI)–defined regions shown as group mean ± SD. Significance (corrected for multiple comparisons) of change is indicated with asterisk (vs. awake) or number sign (vs. drug alone):one symbol for P < 0.05; two symbols for P < 0.01; three symbols for P < 0.001. P = propofol; P+N = propofol plus nitrous oxide; S = sevoflurane; S+N = sevoflurane plus nitrous oxide.