ACNS 2012 Terminology

Periodic = repetition of a waveform with relatively uniform morphology and duration with a quantifiable inter-discharge interval between consecutive waveforms and recurrence of the waveform at nearly regular intervals. Discharges: These are defined as waveforms with no more than 3 phases (i.e. crosses the baseline no more than twice) or any waveform lasting 0.5 seconds or less, regardless of number of phases. This is as opposed to bursts, defined as waveforms lasting more than 0.5 seconds and having at least 4 phases (i.e. crosses the baseline at least 3 times).

o “Nearly regular intervals” is defined as having a cycle length (i.e., period) varying by <50% from one cycle to the next in the majority (>50%) of cycle pairs.