Intermittent rhythmic delta activity

Intermittent rhythmic delta activity (IRDA) is a type of brain wave abnormality found in electroencephalograms (EEG)[1].

Types

It can be classified based on the area of brain it originates from:

  • frontal (FIRDA)
  • occipital (OIRDA)
  • temporal (TIRDA)[2]

It can also be

  • Unilateral
  • Bilateral

Significance

It can be caused by a number of different reasons, some benign, unknown reasons, but also are commonly associated with lesions, tumors, and encephalopathies.[3] Association with periventricular white matter disease and cortical atrophy has been documented and they are more likely to show up during acute metabolic derangements such as uremia and hyperglycemia.[4]

References

  1. ↑ Brigo, Francesco (February 2011). "Intermittent rhythmic delta activity patterns". Epilepsy & Behavior. 20 (2): 254–256. doi:10.1016/j.yebeh.2010.11.009. Retrieved 1 November 2017.  – via ScienceDirect (Subscription may be required or content may be available in libraries.)
  2. ↑ Reiher, J; Beaudry, M; Leduc, CP (November 1989). "Temporal intermittent rhythmic delta activity (TIRDA) in the diagnosis of complex partial epilepsy: sensitivity, specificity and predictive value". The Canadian journal of neurological sciences. Le journal canadien des sciences neurologiques. 16 (4): 398–401. PMID 2804800.
  3. ↑ Accolla, Ettore A.; Kaplan, Peter W.; Maeder-Ingvar, Malin; Jukopila, Sanja; Rossetti, Andrea O. (January 2011). "Clinical correlates of frontal intermittent rhythmic delta activity (FIRDA)". Clinical Neurophysiology. 122 (1): 27–31. doi:10.1016/j.clinph.2010.06.005. PMID 20673647.
  4. ↑ Watemberg, N; Alehan, F; Dabby, R; Lerman-Sagie, T; Pavot, P; Towne, A (December 2002). "Clinical and radiologic correlates of frontal intermittent rhythmic delta activity". Journal of clinical neurophysiology : official publication of the American Electroencephalographic Society. 19 (6): 535–9. PMID 12488784.
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