Prior Seizure (Clinical Seizure in Last 24h Before EEG)

No prior seizure+0Prior clinical seizure within 24h (+2 pts)+2

H — Frequency: Lateralized or Generalized Periodic Discharges ≥ 2 Hz

No high-frequency periodic discharges+0≥ 2 Hz periodic discharges (+1 pt)+1

E — Epileptiform Discharges (Spikes or Sharp Waves ≥ 1.0/min)

No or rare epileptiform discharges+0Epileptiform discharges ≥ 1.0/min (+1 pt)+1

L — Lateralized Periodic Discharges (LPDs) or Lateralized Rhythmic Delta Activity (LRDA)

No LPDs or LRDA+0LPDs or LRDA present (+1 pt)+1

P — Plus Feature (Any Superimposed Rhythmic Activity on Periodic Discharges)

No plus features+0Plus features present (+1 pt)+1

S — Spike-Wave Frequency ≥ 6/h

< 6 spike-wave bursts/h+0≥ 6/h (+1 pt)+1

B — Brief Potentially Ictal Rhythmic Discharges (B(I)IRDS)

No B(I)IRDS+0B(I)IRDS present (+1 pt)+1

2HELPS2B Score for Seizure Detection (EEG)