Amplitude-Integrated EEG can be achieved with a limited number of frontal electrodes.

Amplitude-Integrated EEG can be achieved with a limited number of frontal electrodes. There is a new aEEG technology available: VEEGix, developed by NeuroServo Inc. It is a miniaturized aEEG, non-intrusive, portable and resistant to patient's movements. Its main advantage is its simplicity of use as a single adhesive strip including all electrodes is fixed to the patient's forehead and is connected to the VEEGix device

Variables will include 1) predominant background frequencies: delta 0-3.9 Hz, theta 4-7.9 Hz, alpha 8-11.9 Hz and beta 12-30 Hz and power spectrum (ratio of each frequency/total 0-30Hz), 2) EEG: symmetry (symmetric, mild asymmetry, marked asymmetry) and prevalence (continuous, nearly continuous (1-9% of suppression or attenuation), discontinuous (10-49% of suppression or attenuation), burst suppression or burst-attenuation (50-99% of suppression or attenuation), suppression (>99% of suppression or attenuation) as measured by percentage per hour of recording)(19). As power across all frequency bands decreases significantly with age, children will be divided 0 to 6 months, 6 months to 3 years and 3-18 years old.

The diagnosis of delirium by the vEEGix will be defined as presence of EEG characteristics of delirium (identified in objective 1). Diagnosis of delirium by the vEEGix will be compared to the diagnosis of delirium by the medical team (confirmed by a adjudicating committee). Timing of delirium diagnosis will be compared: diagnosis by the medical team (defined as the first CAPD scores equal or greater than 9) versus diagnosis by the vEEGix (the beginning of the delirium episode will be defined as the appearance of these EEG characteristics).