A Comparative Study of Global 12 Lead Electroencephalogram to Frontal SedlineTM Electroencephalogram

Inclusion Criteria:

1. Adult ASA class 1-3 male or female 18-90 years of age;
2. scheduled for elective craniotomy in the LLUMC University Hospital, for which the surgeon has requested intraoperative burst suppression therapy;
3. capable of understanding and signing informed consent;
4. willing to have dual EEG monitoring.

Exclusion Criteria:

1. Age under 18 years;
2. emergency or trauma situation requiring craniotomy;
3. surgical approach that prohibits placing the SEDLineTM array on the forehead;
4. known sensitivity to the adhesives on the SEDLineTM array;
5. lack of availability of standard EEG monitoring;
6. patients with seizure disorders and refusal of consent.