Slowed Background Activity: Causes & Reasons

Possible Causes for Slowed Background Activity

Developmental and Epileptic Encephalopathy Type 18

Diagnosis The interictal EEG reveals multifocal epileptiform activity and slowing. Diffuse slowing of the background activity. Few patients may have a normal EEG. [intechopen.com]

[…] complexes in one case with 100% of these epileptiform discharge happened during the non-rapid eye movement sleep cycle and one case of slow basic background activity rhythms [nature.com]

Then the EEG background activity became slow with fluctuating asymmetry between different recordings. [intechopen.com]

Progressive Myoclonic Epilepsy Type 8

Slow background activity mixed with low‐voltage fast activity, along with diffuse, irregular, spike‐ and polyspike‐and‐wave discharges Slow background activity and multifocal [onlinelibrary.wiley.com]

[…] fast spikes, polyspikes and polyspike‐and‐wave discharges Slow background activity, spike‐ and polyspike‐and‐wave discharges and multifocal spikes activated by non‐REM sleep [onlinelibrary.wiley.com]

activity 4‐6 Hz with diffuse or multifocal spike and polyspike‐and‐wave discharges. [onlinelibrary.wiley.com]

Progressive Myoclonic Epilepsy Type 3

Cranial CT yielded normal results; EEG revealed overall slowing of the background activity plus some diffuse spike-wave complexes. [elsevier.es]

 EEG - diffuse slow background activity and generalised high-voltage spike and wave, and polyspike and wave paroxysms, ranging from 2–3 Hz to 4–6 Hz, which reach a maximum [slideshare.net]

The EEG showed slow background activity with generalised epileptiform discharges manifesting as spike/polyspike wave complexes of variable duration that persisted throughout [elsevier.es]

Progressive Myoclonic Epilepsy Type 7

However, slow EEG background activity, a poor response to medication, the presence of other seizure types (visual, complex partial, or absence), cognitive decline, and the [medscape.com]

Cranial CT yielded normal results; EEG revealed overall slowing of the background activity plus some diffuse spike-wave complexes. [elsevier.es]

background activity and generalized and focal (occipital) paroxysmal activity typically not accentuated by sleep. [medscape.com]

Epileptic Encephalopathy Type Lennox-Gastaut

EEG with slow background activity, generalised slow spike-wave and generalised fast activity: 100%. Fifty percent of the patients had at least one epileptic status. [ibecs.isciii.es]

Gerstmann-Straussler-Scheinker Disease

[…] of background activity. [rarediseases.org]

Physicians may recommend an electroencephalogram (EEG), which is a test that measures the electrical activity of the brain and may show changes in brain function and slowing [rarediseases.org]

Ramsay-Hunt Cerebellar Syndrome

Tassinari et al have emphasised the electroencephalographic features of their patients with normal or mildly slow waking background activity, fast spike-wave discharges, photosensitivity [docksci.com]

The EEG and polygraphic findings included normal background activity in most patients, spontaneous fast generalised spike-and-wave discharges, photosensitivity, no activation [ncbi.nlm.nih.gov]

[…] and lack of activation during slow wave sleep.' [docksci.com]

Cerebral Calcification - Cerebellar Hypoplasia

Typical EEG abnormalities are background slowing and multifocal epileptiform activity. [frontiersin.org]

EEG showed disorganized background, and generalized paroxysmal activity of fast spike-slow wave complexes. [frontiersin.org]

Developmental and Epileptic Encephalopathy Type 16

activity on EEG at the onset of epilepsy (6/6), with presence of focal or multifocal interictal epileptiform and slow abnormalities (4/6); c) unremarkable brain imaging [research.unipd.it]

6/6); d) subsequent progressively deterioration of the EEG background activity (6/6) and appearance - usually within the first two years of life - of an unusual electrical [research.unipd.it]

[…] sometimes associated in the same event, such as spasms (4/6), myoclonias (4/6), focal seizures (3/6), and apparently generalized tonic or tonic-clonic seizures (2/6); b) normal background [research.unipd.it]

Congenital Disorder of Glycosylation Type 2B

Electroencephalographic recordings (EEG) showed diffuse or focal slow background activity in three patients and anterior fast rhythms (without benzodiazepine therapy) in another [ojrd.biomedcentral.com]

Common EEG features comprise slow background activity, absent sleep stages, multifocal spikes, in three patients additionally spike and waves discharges. [ncbi.nlm.nih.gov]

EEG showed slow background activity with multifocal spikes and spike-wave discharges. All above-mentioned girls were diagnosed with psychomotor/intellectual delay. [ncbi.nlm.nih.gov]

17p13.3 Microduplication Syndrome

EEG recordings revealed slow background activity without paroxysmal features. [ncbi.nlm.nih.gov]

Chromosome 12p Partial Deletion

In addition, around the same period of time, a v-EEG demonstrated signs of a non-specific slow background, but no other abnormal electrographic activity had been identified [molecularcytogenetics.biomedcentral.com]

background activity, as well as no epileptiform discharges Full size image Fragile X DNA screening, as well as metabolic screening for Inborn Errors of Metabolism results [molecularcytogenetics.biomedcentral.com]

Increased signal in FLAIR images in the withe matter territories adjacent to the lateral ventricles bodies and subcortical zone Full size image Fig. 8 EEG showing non specific slow [molecularcytogenetics.biomedcentral.com]

Unverricht-Lundborg Syndrome

The dominant EEG-change was slow background activity in all of the patients. Seven patients had generalized seizure activity. [seizure-journal.com]

Slow background activity, generalized spike wave discharges, or generalized spike wave bursts of 3-5 Hz frequency are seen on Electroencephalogram (EEG). [heraldopenaccess.us]

Slowing in background activity, generalized spike wave discharges, and progressive generalized spike wave bursts of 3-5 Hz are observed in EEG. [heraldopenaccess.us]

Developmental and Epileptic Encephalopathy Type 50

Common EEG features comprise slow background activity, absent sleep stages, multifocal spikes, in three patients additionally spike and waves discharges. [mdpi.com]

EEG showed slow background activity with multifocal spikes and spike-wave discharges. All above-mentioned girls were diagnosed with psychomotor/intellectual delay. [mdpi.com]

Congenital Disorder of Glycosylation Type 1J

Common EEG features comprise slow background activity, absent sleep stages, multifocal spikes, in three patients additionally spike and waves discharges. [mdpi.com]

EEG showed slow background activity with multifocal spikes and spike-wave discharges. All above-mentioned girls were diagnosed with psychomotor/intellectual delay. [mdpi.com]

Congenital Disorder of Glycosylation Type 2C

Common EEG features comprise slow background activity, absent sleep stages, multifocal spikes, in three patients additionally spike and waves discharges. [ncbi.nlm.nih.gov]

EEG showed slow background activity with multifocal spikes and spike-wave discharges. All above-mentioned girls were diagnosed with psychomotor/intellectual delay. [ncbi.nlm.nih.gov]

Developmental and Epileptic Encephalopathy Type 15

activity on EEG at the onset of epilepsy (6/6), with presence of focal or multifocal interictal epileptiform and slow abnormalities (4/6); c) unremarkable brain imaging [research.unipd.it]

6/6); d) subsequent progressively deterioration of the EEG background activity (6/6) and appearance - usually within the first two years of life - of an unusual electrical [research.unipd.it]

Myoclonic-Astatic Epilepsy

Interictal EEG showed in 88.2% patients a slow background activity. All patients had diffuse epileptic abnormalities at the onset activating during sleep. [moh-it.pure.elsevier.com]

This rhythmic slowing of background activity was frequently questioned and falsely attributed to drowsiness. [neupsykey.com]

background activity in electroencephalogram (EEG) [ 1 ]. [omicsonline.org]

Congenital Disorder of Glycosylation Type 2F

Common EEG features comprise slow background activity, absent sleep stages, multifocal spikes, in three patients additionally spike and waves discharges. [ncbi.nlm.nih.gov]

EEG showed slow background activity with multifocal spikes and spike-wave discharges. All above-mentioned girls were diagnosed with psychomotor/intellectual delay. [ncbi.nlm.nih.gov]

Congenital Disorder of Glycosylation Type 1K

EEGs showed slow background activity in 2 patients (cases 1 and 3) and was normal in the other 2 (cases 2 and 5). [ajnr.org]

Common EEG features comprise slow background activity, absent sleep stages, multifocal spikes, in three patients additionally spike and waves discharges. [ncbi.nlm.nih.gov]

EEG showed slow background activity with multifocal spikes and spike-wave discharges. All above-mentioned girls were diagnosed with psychomotor/intellectual delay. [ncbi.nlm.nih.gov]

Progressive Myoclonic Epilepsy Type 6

Cranial CT yielded normal results; EEG revealed overall slowing of the background activity plus some diffuse spike-wave complexes. [elsevier.es]

The characteristic EEG pattern is slowing of background activity with recurrent epileptiform discharges: spikes/polyspikes, with or without slow waves. [20] LBD is caused [bioline.org.br]

Congenital Disorder of Glycosylation Type 1F

Common EEG features comprise slow background activity, absent sleep stages, multifocal spikes, in three patients additionally spike and waves discharges. [mdpi.com]

EEG showed slow background activity with multifocal spikes and spike-wave discharges. All above-mentioned girls were diagnosed with psychomotor/intellectual delay. [mdpi.com]

Congenital Disorder of Glycosylation Type 1W

Common EEG features comprise slow background activity, absent sleep stages, multifocal spikes, in three patients additionally spike and waves discharges. [mdpi.com]

EEG showed slow background activity with multifocal spikes and spike-wave discharges. All above-mentioned girls were diagnosed with psychomotor/intellectual delay. [mdpi.com]

Congenital Disorder of Glycosylation Type 1A

GNAO1 Encephalopathy

In the two brothers (Patients 10 and 11), EEG showed slow background activity, and no epileptic discharge. Figure 3. [frontiersin.org]

Out of the eight patients with epilepsy, EEG results showed three (Patients 1, 4, and 6) to have slow rhythm of background activity. [frontiersin.org]

Lennox-Gastaut Syndrome

The electroencephalograms in both cases showed frequent generalized paroxysms and slow background activity. [ncbi.nlm.nih.gov]

activity/diffuse slowing. [hindawi.com]

EEG Changes Although the preoperative slow background activity and diffuse slowing remained unchanged in most of the patients, 12 patients with Engel Class I or II outcomes [hindawi.com]

Congenital Disorder of Glycosylation with Developmental Anomaly

Lissencephaly due to TUBA1A Mutation

It showed asymmetric slow background activities with focal discharges (arrows) from the left frontotemporal region. Figure 2. [mdpi.com]

Electroencephalography demonstrated irregular organization of the background activity and slow waves posteriorly on the left side. [mdpi.com]

It showed asymmetric slow background activities with focal discharges (arrows) from the left frontotemporal region. Figure 1. Sleep EEG of Case 1. [mdpi.com]

Developmental and Epileptic Encephalopathy Type 8

Electroencephalography may show fast spikes initially during the tonic spasms, followed by slowing of background activity with eventual flattening corresponding to the phase [pmj.bmj.com]

[…] of background activity with eventual flattening corresponding to the phase of apnoea bradycardia and cyanosis. 7 33 Electromyography shows a characteristic almost permanent [pmj.bmj.com]

Background activity was diffusely slow. b After treatment, the recording showed only slow low-voltage background activity. [karger.com]

Developmental and Epileptic Encephalopathy Type 19

Several patients had West syndrome with typical electroencephalographic findings that tended to evolve into disorganized slow background activity with frequent multifocal [mdpi.com]

Diagnosis The interictal EEG reveals multifocal epileptiform activity and slowing. Diffuse slowing of the background activity. Few patients may have a normal EEG. [intechopen.com]

The interictal EEG reveals multifocal epileptiform activity and slowing, diffuse slowing of the background activity. A few patients may have a normal EEG. [hindawi.com]