TIRDA (temporal intermittent rhythmic delta activity)

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  • Temporal
  • Intermittent: In cycles, so not continuous
  • Rhythmic: Repetition of a waveform with relatively uniform morphology and duration, without an interval between consecutive waveforms.
  • Delta: Delta waves
  • Activity


  • Short burst of rhythmic delta activity in the temporal region
  • Amplitude of 50-100 microV
  • The TIRDA can be more specified with the prevalence, duration, frequency, amplitude, stimulus-induced (SI), Evolving OR Fluctuating (both terms refer to changes in either frequency, location or morphology).
  • If a more ictal appearance it can be categorized as TIRDA+:[1]
    • +F: superimposed fast activity.
    • +S: superimposed sharp waves or spikes, or sharply contoured.
    • +FS: superimposed fast activity and sharp waves or spikes, or sharply contoured.

Clinical relevance

  • Strong association with temporal lobe epilepsy
  • Occurs in 28% of patients with temporal lobe epilepsy [2]


Other intermittent rhythmic delta activity:

TIRDA in a 72 year old female with left temporal epilepsy (average) TIRDA in a 72 year old female with left temporal epilepsy (average) EEGpedia.png

Notes

  1. ↑ ACNS STANDARDIZED ICU EEG NOMENCLATURE v. 2012
  2. ↑ Geyer JD et al. Significance of interictal temporal lobe delta activity for localization of the primary epileptogenic region. Neurology. 1999 Jan 1. 52(1):202-5.
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