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Table 1 Clinical summary of quantitative EEG in subarachnoid hemorrhage

From: Quantitative EEG for the detection of brain ischemia

First author [ref] N SAH Grade Clinical Criteria Outcome qEEG Results
Labar [7] 11 HH I: 2 1) Focal neurological deficit Ischemic events (n = 18) 5 silent infarcts detected by qEEG alone
   HH III: 8 2) Global cortical dysfunction   4 qEEG changes prior to clinical changes
   HH IV: 1 3) Encephalopathy   
Vespa [8] 32 Awake
(HH I-III)
1) Angiographic vasospasm Vasospasm (n = 19) All vasospasm with qEEG changes.
    2) TCD vasospasm (> 120 cm/s or Lindegaard ratio > 3)   10/19 qEEG changed mean 2.9 days prior to vasospasm confirmation.
Claassen [9] 34 Comatose
(HH IV-V)
DCI DCI (n = 9) Raw EEG changed in 78%; qEEG sensitive to a 10% change in 6 post-stimulation minutes or 50% change in only 1 post-stimulation minute.
    1) Clinical deterioration   
    2) New infarct on CT   
Rathakrishnan [10] 12 mF 3-4 DCI DCI (n = 8) qEEG sensitivity with clinical data is 67%.
   HH I: 1 1) Clinical deterioration   3/8 qEEG changed more than 24 hours prior to clinical change.
   HH II: 5 2) New infarct on CT   
   HH III: 2    
   HH IV: 3    
   HH V: 1    
  1. DCI, delayed cerebral ischemia; HH, Hunt-Hess Grade; mF, Modified Fisher Grade; qEEG, quantitative EEG; SAH, subarachnoid hemorrhage; TCD, transcranial Doppler ultrasonography.