Intermittent rhythmic delta activity

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

Types

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

frontal (FIRDA)
occipital (OIRDA)
temporal (TIRDA)

It can also be

Unilateral
Bilateral

Cause

It can be caused by a number of different reasons, some benign, unknown reasons, but also are commonly associated with lesions, tumors, and encephalopathies. 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.

Diagnosis

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References

Brigo, Francesco (February 2011). "Intermittent rhythmic delta activity patterns". Epilepsy & Behavior. 20 (2): 254–256. doi:10.1016/j.yebeh.2010.11.009. PMID 21276757. S2CID 11689350. – via ScienceDirect (Subscription may be required or content may be available in libraries.)
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. 16 (4): 398–401. doi:10.1017/S0317167100029450. PMID 2804800.
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. S2CID 38930018.
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. 19 (6): 535–9. doi:10.1097/00004691-200212000-00006. PMID 12488784. S2CID 32579431.

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