Fig. 1. Mean (± SD) arteriojugular oxygen difference (AJDo²) (  A ), venoarterial difference in carbon dioxide tension (DPco²) (  B ), DPco²/AJDo²ratio (ratio) (  C ), and cerebral perfusion pressure (CPP) (  D ) across the different patterns: normal (N), compensated hypoperfusion (C), uncompensated hypoperfusion (U), death (D). *  P < 0.05, **  P < 0.01.