Electrographic seizures duration and inter-seizure intervals in focal status epilepticus.

Focal seizures within a SE episode showed a wide range of duration, partly overlapping with the duration of focal self-limiting seizures, but with a longer median duration. Inter-seizure intervals within an episode of SE were shorter than 1 minute in 50% of the seizures and never lasted more than 10 minutes. Finally, an increase in seizure duration could represent an "electrophysiological biomarker" of a more severe SE episode, which may require more aggressive and rapid treatment.