Fig. 2.
Median COx values at baseline and after administration of phenylephrine and sodium nitroprusside. COx = cerebral oximetry index; Group 1 = pressure passive cerebral circulation; Group 2 = classic pattern of autoregulation; Group 3 = paradoxical ScO2 changes after vasoactive drug administration; Group 4 = divergent effects of phenylephrine and sodium nitroprusside on COx. PEBLCOx = baseline cerebral oximetry index before administration of phenylephrine; PECOx = cerebral oximetry index after administration of phenylephrine; SNPBLCOx = baseline cerebral oximetry index before administration of sodium nitroprusside; SNPCOx = cerebral oximetry index after administration of sodium nitroprusside.