View source for Intermittent rhythmic delta activity

{{Short description|Type of abnormal brain wave}}
'''Intermittent rhythmic delta activity''' ('''IRDA''') is a type of [[Neural oscillation|brain wave]] abnormality found in [[electroencephalogram]]s (EEG).<ref>{{cite journal|last1=Brigo|first1=Francesco|title=Intermittent rhythmic delta activity patterns|journal=Epilepsy & Behavior|date=February 2011|volume=20|issue=2|pages=254–256|doi=10.1016/j.yebeh.2010.11.009|pmid=21276757|s2cid=11689350}}{{Subscription or libraries|sentence|via=[[ScienceDirect]]}}</ref>
__TOC__
==Types==
It can be classified based on the area of brain it originates from:
* frontal (FIRDA)
* occipital (OIRDA)
* temporal (TIRDA)<ref name="pmid2804800">{{cite journal |last1=Reiher |first1=J |last2=Beaudry |first2=M |last3=Leduc |first3=CP |title=Temporal intermittent rhythmic delta activity (TIRDA) in the diagnosis of complex partial epilepsy: sensitivity, specificity and predictive value. |journal=The Canadian Journal of Neurological Sciences |date=November 1989 |volume=16 |issue=4 |pages=398–401 |pmid=2804800|doi=10.1017/S0317167100029450 |doi-access=free }}</ref>

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 [[lesion]]s, [[tumor]]s, and [[encephalopathy|encephalopathies]].<ref>{{cite journal |last1=Accolla |first1=Ettore A. |last2=Kaplan |first2=Peter W. |last3=Maeder-Ingvar |first3=Malin |last4=Jukopila |first4=Sanja |last5=Rossetti |first5=Andrea O. |title=Clinical correlates of frontal intermittent rhythmic delta activity (FIRDA) |journal=Clinical Neurophysiology |date=January 2011 |volume=122 |issue=1 |pages=27–31 |doi=10.1016/j.clinph.2010.06.005 |pmid=20673647|s2cid=38930018 }}</ref> 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]].<ref>{{cite journal |last1=Watemberg |first1=N |last2=Alehan |first2=F |last3=Dabby |first3=R |last4=Lerman-Sagie |first4=T |last5=Pavot |first5=P |last6=Towne |first6=A |title=Clinical and radiologic correlates of frontal intermittent rhythmic delta activity. |journal=Journal of Clinical Neurophysiology |date=December 2002 |volume=19 |issue=6 |pages=535–9 |pmid=12488784|doi=10.1097/00004691-200212000-00006 |s2cid=32579431 }}</ref>
==Diagnosis==
{{Empty section|date=August 2021}}

==References==
{{Reflist}}

{{Neuroscience|state=collapsed}}

{{DEFAULTSORT:Intermittent Rhythmic Delta Activity}}
[[Category:Electroencephalography]]
[[Category:Neuroscience]]


{{nervoussystem-disease-stub}}