Fig. 2. Jugular venous oxygen saturation after moving to the beach chair position in patients under sevoflurane-nitrous oxide or propofol-remifentanil anesthesia. Values are means ± SD *P < 0.05 versus baseline. †P < 0.05 versus propofol-remifentanil anesthesia group (all the time). The number of patients in the sevoflurane-nitrous oxide group decreased from 19 at baseline to 17 at 90 min, whereas the number of patients in the propofol-remifentanil group decreased from 17 at baseline to 15 at 90 min. P/R = propofol-remifentanil anesthesia; S/N = sevoflurane-nitrous oxide anesthesia; SjvO2= jugular venous oxygen saturation.