Temporal Intermittent Rhythmic Delta Activity in Electroencephalograms

Normand, Marlene M.; Wszołek, Zbigniew K.; Klass, Donald W.

doi:10.1097/00004691-199505010-00005

Cited by 52 publications

(19 citation statements)

References 0 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…6 Spikes/Sharp waves in corresponding area found in complex partial seizures and periodic complexes, slow spike wave discharges found in Myoclonic seizures, generalized polyspike and slow waves found in Juvenile Myoclonic Epilepsy.…”

mentioning

confidence: 99%

Interictal wave pattern study in EEG of epilepsy patients

Bhuyan¹,

Jahan

Upadhyaya

2017

Int J Res Med Sci

View full text Add to dashboard Cite

Background: EEG or Electroencephalogram is the most important diagnostic tool to detect Epilepsy. Interictal period is the time interval between two seizure episodes of an Epileptic patient. Certain wave patterns appear in the interictal period in the EEG which might predict the onset of a seizure or may give information about the last seizure attack. The aim of the study was to know how the interictal wave patterns help in diagnosing and classifying Epilepsy casesMethods: The present study was done in the Department of Physiology in association with the Department of Neurology, Assam Medical College and Hospital, Dibrugarh, Assam from June 2014 to May 2015. 113 clinically diagnosed cases of Epilepsy were studied and analyzed through Electro-encephalogram using the internationally accepted 10-20 electrode placement method. The interictal period was enquired in the history and the wave patterns that appeared in the EEG were recorded. The EEG findings were compared with the clinical diagnosis.Results: The IEDs detected were mainly of four types: Sharp waves, Spikes, Spike and wave and Polyspikes. It was found that the sharp waves (88.89%) were the predominant waveforms in the IEDs detected and this was followed by the ‘3 Hz spike and wave pattern’. It was also seen that the ‘3 Hz spike and wave pattern’ was associated with ‘Absence seizures’. And Myoclonic seizures were associated with polyspikes.Conclusions: It is hereby concluded that certain wave patterns in EEG appear in certain types of epilepsy that can be clinically correlated for proper diagnosis of epilepsy.

show abstract

mentioning

confidence: 99%

Interictal wave pattern study in EEG of epilepsy patients

Bhuyan¹,

Jahan

Upadhyaya

2017

Int J Res Med Sci

View full text Add to dashboard Cite

show abstract

“…Overall, fast rhythms of Ն15 Hz occur in arousal or active states, whereas slow oscillations of Յ1-4 Hz dominate during deep sleep (Niedermeyer, 1993;Steriade, 1993) or some epileptiform activities (Reiher et al, 1989;Gambardella et al, 1995;Normand et al, 1995). Alterations in these oscillations are associated with or result from substantial changes in brain structure and f unction, and detection of these abnormalities by electroencephalography (EEG) is a widely used diagnostic approach in clinical practice.…”

mentioning

confidence: 99%

Slow Oscillations (≤1 Hz) Mediated by GABAergic Interneuronal Networks in Rat Hippocampus

Zhang¹,

Velázquez

Tian³

et al. 1998

J. Neurosci.

View full text Add to dashboard Cite

Perfusion of rat brain slices with low millimole CsCl elicits slow oscillations of Յ1 Hz in hippocampal CA1 pyramidal neurons. These oscillations are GABA A receptor-mediated hyperpolarizations that permit a coherent fire-pause pattern in a population of CA1 neurons. They can persist without the activation of ionotropic glutamate receptors but require adenosinedependent inhibition of glutamate transmission. In response to external Cs ϩ , multiple interneurons in the CA1 region display rhythmic discharges that correlate with the slow oscillations in CA1 pyramidal neurons. The interneuronal discharges arise spontaneously from the resting potential, and their rhythmicity is regulated by periodic, GABA A receptor-mediated hyperpolarizations. In addition, interneurons show periodic partial spikes and neurobiotin coupling, and applications of known gap junctional uncouplers interrupt the Cs ϩ -induced slow rhythm in both CA1 pyramidal neurons and interneurons. We propose that these slow oscillations originate from a GABAergic interneuronal network that interacts through reciprocal inhibition and possibly gap junctional connection.

show abstract

“…While rhythmic EEG patterns have been related to drowsiness in older adults (frontal rhythmic delta activity, Santamaria & Chiappa, 1987), the TIRDA recorded in the current study was present during the awake state. TIRDA has generally been examined as interictal activity present in some people with a history of temporal lobe epilepsy(Normand, Wszolek, & Klass, 1995). More specifically, one study found that TIRDA was related to complex partial seizures; TIRDA was present in 27% to 35% of recordings (awake and sleep, respectively) in younger people with partial epilepsy (Reiher et al,1989).…”

Section: Discussionmentioning

confidence: 99%

Abnormal EEGs in Cognitively and Physically Healthy Oldest Old: Findings From The 90+ Study

Peltz¹,

Kim²,

Kawas³

2010

Journal of Clinical Neurophysiology

View full text Add to dashboard Cite

People aged 90 and older (oldest-old), the fastest growing segment of the United States population, are known to have high rates of spells of all types, including strokes, transient ischemic attacks, and seizures. This study examined the prevalence of EEG abnormalities in 12 physically and cognitively healthy oldest-old (mean age=94) with no history of seizures or spells. Abnormalities were found in 83% of participants: temporal intermittent polymorphic slowing was seen in 67%, background slowing (alpha rhythm <8 Hz) was present in 33%, and temporal intermittent rhythmic delta was found in 17%. The high rates of EEG abnormalities found in these physically and cognitively healthy participants prompt reappraisal of pathological significance in this unique population.

show abstract

Temporal Intermittent Rhythmic Delta Activity in Electroencephalograms

Cited by 52 publications

References 0 publications

Interictal wave pattern study in EEG of epilepsy patients

Interictal wave pattern study in EEG of epilepsy patients

Slow Oscillations (≤1 Hz) Mediated by GABAergic Interneuronal Networks in Rat Hippocampus

Abnormal EEGs in Cognitively and Physically Healthy Oldest Old: Findings From The 90+ Study

Contact Info

Product

Resources

About