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

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.^[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]

Diagnosis

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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[1] 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.)

[pmid2804800-2] 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. 16 (4): 398–401. doi:10.1017/S0317167100029450. 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. S2CID 38930018.

[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. 19 (6): 535–9. doi:10.1097/00004691-200212000-00006. PMID 12488784. S2CID 32579431.

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