GPD (Generalized periodic discharges)

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  • Any pattern of generalized synchronous, repetitive discharges of similar morphology
  • Relative symmetric
  • Periodic, so with interdischarge interval recurring at nearly regular intervals.
    • A pattern can qualify as periodic as long as it continues for at least 6 cycles
  • Frontal- or occipital-dominant.
  • If a more ictal appearance it can be categorized as GPD+:[1]
    • +F: superimposed fast activity.
    • +R: superimposed rhythmic or quasi-rhythmic activity.
    • +FR: superimposed fast activity and rhythmic or quasi-rhythmic activity.



GPD’s in a 85 years old male after a out of hospital cardiac arrest (source), the discharges are symmetric, similar morphology with the same interdischarge intervals GPD in a 85 years old male after a out of hospital cardiac arrest.png


Notes

  1. ACNS STANDARDIZED ICU EEG NOMENCLATURE v. 2012