Amplitude Integrated EEG (aEEG) displays amplitude characteristics of the EEG signal.
Amplitude Integrated EEG (aEEG) displays the amplitude characteristics of a filtered, rectified representation of the EEG signal as a function of time where the peak-to-peak amplitude is the output. Time is displayed on the x-axis and the aEEG amplitude measure plotted as a semilogarithmic scale on the y-axis. The left and right hemispheres are displayed concurrently where red corresponds to the right hemisphere, blue corresponds to the left hemisphere and pink indicates an overlap in the two.
In the example below, the seizure causes both sides, red and blue, to create an upward arch shape. Since it is a predominantly left-sided seizure, the blue arch is higher, indicating higher amplitude in the left hemisphere.
EEG and Trends view with the aEEG trend highlighted, where blue represents the left hemisphere and red represents the right hemisphere. The time point shown (indicated by the time sync marker) is after the seizure has occurred. In the one hour trend view, it is easily seen that the predominantly left-sided seizure caused a blue maximal upward arch. Immediately following the seizure, the blue trace dips below the red, representing the post-ictal attenuation of the left hemisphere.