Neonatal seizure type, electrographic definition, and spread

Criteria & assessment

• Electrographic seizure is repetitive and unequivocally evolves in frequency, voltage, morphology, or location, reaches >=2 µV peak-to-peak, and lasts >=10 seconds; there is no minimum electrical frequency.
• The 2 µV threshold marks seizure beginning and end; two events are separate only when the inter-event interval is >=10 seconds.
• Electroclinical seizure has definite simultaneous clinical seizure signs; electrographic-only seizure has no specific visible clinical sign; clinical-only events have no simultaneous EEG seizure.
• Spread classes are diffuse asynchronous involvement of all electrodes, bilateral independent, migrating between hemispheres, lateralized within one hemisphere, unifocal onset, or multifocal onset from >=3 independent foci with >=1 in each hemisphere.
• Restricted locations may be frontal, central, temporal, occipital, vertex, anterior quadrant, posterior quadrant, or hemispheric left/right.