Table 4.

Performance of non-invasively estimated CPP (both CPPe and CrCP/CPPe) to detect episodes of reduced cerebral perfusion pressure (CPP) below clinical goal (n = 14 for CPP < 50 mmHg, n = 22 for CPP < 60 mmHg)

	CPPe < 50 mmHg	CrCP/CPPe < 50 mmHg	CPPe < 60 mmHg	CrCP/CPPe < 60 mmHg
Sensitivity	100	66	73	67
Specificity	91	53	78	63
Positive predictive value	27	8	60	48
Negative predictive value	100	96	90	100

CPPe estimated cerebral perfusion pressure, CrCP/CPPe critical closing pressure derived cerebral perfusion pressure