Figure 4. Changes in cerebrovascular hemoglobin oxygen saturation (Delta Sc^O2, from baseline) at each condition during cardiac surgery in patients who had abnormal postoperative neurologic status (n = 3) versus normal postoperative neurologic status (n = 23). B = baseline at normothermia; 1 = on deep hypothermic cardiopulmonary bypass (cCPB); 2 = at the end of circulatory arrest (arrest); 3 = on recirculation 3 min after resuming CPB (rCPB); 4 = normothermic CPB (wCPB); 5 = after CPB (end). By definition, Delta Sc^O2= 0 at baseline. Values are mean plus/minus SEM.* Significantly different between groups.