Assess aEEG amplitude, occurrance of seizures and artefact

Normal amplitude/Continuous normal voltage: Upper margin >10uvolts, lower margin >5uvolts; EEG shows continuous activity.

Moderately abnormal amplitude/Discontinous normal voltage: Upper margin >10uvolts, lower margin <5uvolts; EEG moderately discontinuous

Severely abnormal amplitude/ Low voltage or bursts: Upper margin <10uvolts apart from bursts, lower margin may be artificially elevated due to ECG signal.

Seizures: characterised by sudden change in amplitude

Artefact: May be electric eg ecg artefact or movement artefact