EEG and delayed cerebral ischemia in SAH

Authors	Design	Diagnostic modality, clinical grade	N	Findings
Rivierez et al. [35]	P CS	Angio, HH I–V	151	Raw EEG D1 predicted D5 confirmed ischemia
Labar et al. [33]	P CS	Angio, HH I–V	11	Four cases qEEG changes preceded clin change
Vespa et al. [36]	P CS	Angio, HH I–V	32	Relative alpha variability: PPV 76 %, NPV 100 %; qEEG preceded other measures by 2 d
Claassen et al. [32]	P CS	DCI; HH III-V	34	>10 % decrease in alpha-delta-ratio: sens 100 %, specificity 76 %
Rathakrishnan et al. [34]	P CS	DCI, HH I–V	12	Mean alpha power: 67 % sens, 73 % spec for worsening, improvement 50 % sensitivity, 74 % specificity

PPV positive predictive value, NPV negative predictive value