Normal Interictal EEG: Causes & Reasons

Possible Causes for Normal Interictal EEG

Infantile Convulsions and Choreoathetosis

interictal EEG Basal ganglia calcification Acrania Cerebral calcification Memory impairment Dementia Hallucinations Slurred speech Visual hallucinations Neurological speech [mendelian.co]

In most cases the interictal electroencephalogram (EEG) is normal while the ictal EEG shows abnormalities that may originate from various cerebral lobes. [doi.org]

The interictal EEG of these two probands was normal. Figure 1 Pedigrees of the 22 BFIE families and 8 ICCA families. The arrow indicates the proband. [bmcneurol.biomedcentral.com]

Benign Familial Infantile Epilepsy Type 4

Inclusion criteria for BIS were as follows: 1) age of onset 2-24 months; 2) normal development; 3) normal interictal EEG; 4) normal brain imaging; and 5) good response to [pediatricneurologybriefs.com]

They had normal psychomotor development during and after the onset of seizures, had normal interictal EEG, normal brain imagining and good response to treatment. [cags.org.ae]

interictal EEG 0002372 Showing of 7 | Last updated: 1/1/2020 Making a diagnosis for a genetic or rare disease can often be challenging. [rarediseases.info.nih.gov]

Familial Infantile Myoclonic Epilepsy

interictal EEG pattern. [ncbi.nlm.nih.gov]

EEG Background. The background EEG is normal. Interictal EEG. The interictal EEG is normal. Activation. [medlink.com]

[…] form of infantile myoclonic epilepsy (BIME), FIME is a true idiopathic IME with unremarkable history, no neurologic or mental impairment, good response to treatment, and normal [ncbi.nlm.nih.gov]

Acquired Epileptic Aphasia

Her brain CT, MRI and SPECT scans were entirely normal. Interictal EEG showed several low amplitude sharp activities predominating on the right frontal central area. [jstage.jst.go.jp]

In autosomal dominant frontal lobe epilepsy, interictal EEG is often normal, and ictal EEG unhelpful or non-localising. [jnnp.bmj.com]

interictal epileptiform discharges (IEDs) on EEG (Landau and Kleffner 1957). [neupsykey.com]

Benign Familial Infantile Epilepsy

Advanced Search Help Advanced search lets you search selected properties of the classification. You could search all properties or a selected subset only First, you need to provide keywords in the Search Text field then check the properties that you'd like to include in the search. The system will search for the[…] [icd.who.int]

Autosomal Recessive Benign Familial Neonatal Epilepsy

Epileptic and developmental encephalopathy KCNQ2 Synonyms KCNQ2-related neonatal epileptic encephalopathy Early childhood epileptic encephalopathy 7 (EIEE7) Epilepsy KCNQ2 KCNQ2 Encephalopathy KCNQ2 epileptic encephalopathy Related ailments Benign familial neonatal seizures / convulsions (BFNC / S) The discovery of[…] [europeankcnq2association.com]

Benign Familial Infantile Epilepsy Type 3

Benign Familial Neonatal Epilepsy Type 3

interictal EEG 0002372 Showing of 7 | Last updated: 3/1/2020 Making a diagnosis for a genetic or rare disease can often be challenging. [rarediseases.info.nih.gov]

Ictal electroencephalogram (EEG) may show focal interictal abnormalities, mainly over the central regions, but otherwise the EEG background is normal. [orpha.net]

Outside the cluster, waking and sleeping interictal EEG is normal. Interictal neurological examination and brain imaging (brain CT and/or MRI) are normal. [orpha.net]

Atypical Absence Seizure

The interictal EEG background is generally abnormal. In the study of Holmes et al,4 only 11% of 27 patients with atypical absences had a normal interictal EEG. [epilepsy.com]

Ictal EEG showed frequent and recurrent generalized paroxysms of 4–6 Hz PSW and SW intermixed with brief periods of normal background activity, while the interictal EEG showed [hindawi.com]

Interictal EEG readings are usually normal and seizures are often triggered by hyperventilation; video EEG is usually the diagnostic test of choice. [elsevier.es]

KCNQ2-Related Disorders

(a) Interictal EEG in natural sleep is not normal; theta and delta waves are absent and there is atypical burst-suppression pattern (average amplitude 100–150 µV, burst duration [stdjhs.scienceandtechnology.com.vn]

Interictal neurological examination revealed his muscle tone was weaker than normal. [stdjhs.scienceandtechnology.com.vn]

(b) Interictal EEG in natural sleep in which background is symmetrical and synchronous with some paroxysmal activities in the frontal lobe (average amplitude 70–100 µV). [stdjhs.scienceandtechnology.com.vn]

Nocturnal Frontal Lobe Epilepsy

Interictal wake EEG Fifty-five patients (55%) had a normal wake scalp EEG. [academic.oup.com]

[…] ictal and interictal EEGs without clear-cut epileptic paroxysms in more than 50% of the cases and general benefit from some antiepileptic drugs (AEDs), but occasional resistance [touchneurology.com]

The results of interictal electroencephalogram (EEG) are usually normal, as are computed tomographic scans and magnetic resonance images. [jamanetwork.com]

Developmental and Epileptic Encephalopathy Type 16

[…] background 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 [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 [research.unipd.it]

Myoclonic Epilepsy of Infancy

EEG Background. The background EEG is normal. Interictal EEG. The interictal EEG is normal. Activation. [medlink.com]

 No specific EEG pattern, interictal background may be normal.  Spontaneous recovery with favorable outcome.  Can occur as late as 3.5 months and occur later in premature [slideshare.net]

Ictal EEG recordings showed generalized spike-wave and/or polyspike-wave synchronous with myoclonus; interictal EEG was normal. [pediatricneurologybriefs.com]

Familial Temporal Lobe Epilepsy Type 6

A normal interictal EEG was found in three patients (3.6%). [dovepress.com]

This neurologic tenet is based on the fact that many children with seizures have normal interictal EEGs. [aafp.org]

Diagnosis Brain imaging is expected to be normal. EEG, ictal and interictal, show focal epileptic discharges in different areas. [doctorstrizhak.com]

Idiopathic Generalized Epilepsy

These patients had no family history of epilepsy, normal neurological evaluation, normal neuroimaging, interictal EEG showing generalized spike- and polyspike-wave discharges [ncbi.nlm.nih.gov]

We describe three adolescents who presented with hemiconvulsive seizures and were found to have 3-cps generalized spike-and-wave discharges on ictal and/or interictal EEG. [ncbi.nlm.nih.gov]

Inclusion criteria for the study included normal intelligence, no previous or present use of antiepileptic drugs, and a normal interictal EEG background (excluding epileptiform [jamanetwork.com]

Developmental and Epileptic Encephalopathy Type 19

They both had seizures in the first weeks of life and normal EEG interictally. Both developed infantile spasms and severe developmental defect. [portal.findresearcher.sdu.dk]

The interictal EEG is normal initially. [hindawi.com]

Developmental and Epileptic Encephalopathy Type 15

Bilateral Temporo-Occipital Polymicrogyria

Interictal EEG recordings revealed the presence of spikes and sharp waves over the posterior regions involving the parietal and occipital lobes bilaterally ( Fig. 1 ). [onlinelibrary.wiley.com]

Interictal EEG during wakefulness and sleep displayed bilateral spikes and diphasic sharp-waves localized over the temporal leads with a marked increase in frequency during [ijponline.biomedcentral.com]

The laboratory examinations were normal. [onlinelibrary.wiley.com]

Autosomal Dominant Nocturnal Frontal Lobe Epilepsy Type 3

Interictal scalp EEG registrations were mostly normal, ictal scalp EEG registrations in three individuals revealed left frontal low-voltage epileptiform discharges in two, [ncbi.nlm.nih.gov]

Interictal wake EEG Fifty-five patients (55%) had a normal wake scalp EEG. [academic.oup.com]

Interictal EEG is often normal but may show anterior epileptiform abnormalities, typically in sleep. [epilepsydiagnosis.org]

Familial Febrile Seizures Type 11

This neurologic tenet is based on the fact that many children with seizures have normal interictal EEGs. [aafp.org]

Routine interictal EEG recordings showed normal background activity. [ingentaconnect.com]

Interictal EEGs may be normal. Computed tomography has demonstrated abnormalities in 7 to 19 percent of children with new-onset seizures. [aafp.org]

Cerebral Calcification - Cerebellar Hypoplasia

Several “interictal” sleep EEGs, lasting about 30 min, were normal. [frontiersin.org]

Familial Temporal Lobe Epilepsy Type 5

A normal interictal EEG was found in three patients (3.6%). [dovepress.com]

This neurologic tenet is based on the fact that many children with seizures have normal interictal EEGs. [aafp.org]

EEGs showed focal temporal interictal epileptiform discharges in 22%. MRIs were normal. Autosomal dominant inheritance with age-dependent penetrance was likely. [pediatricneurologybriefs.com]

Frontal Lobe Epilepsy

Interictal wake EEG Fifty-five patients (55%) had a normal wake scalp EEG. [academic.oup.com]

[…] monitoring If the events are primarily or exclusively nocturnal, polysomnography should be considered, with extended EEG montages if available Interictal EEGs may be normal [emedicine.medscape.com]

Rolandic Epilepsy - Speech Dyspraxia Syndrome

[…] early interictal EEG XD SLC25A22 Cerebellar hypoplasia, CC malformation AR STXBP1 AD 6% SPTAN1 Cerebral atrophy, hypomyelination AD KCNQ2 Early (resolving) thalamic/BG hyperintensities [rch.org.au]

A method for confirming a diagnosis of rolandic epilepsy in a patient who has had a seizure or an interictal EEG with centrotemporal sharp waves and normal background, comprising [brevets-patents.ic.gc.ca]

[…] global developmental milestones; (vi) normal neurological examination; (vii) at least one interictal EEG with centrotemporal sharp waves and normal background, verified by [encrypted.google.com]

Focal Epilepsy - Speech Disorder - Mental Retardation

In autosomal dominant frontal lobe epilepsy, interictal EEG is often normal, and ictal EEG unhelpful or non-localising. [jnnp.bmj.com]

Could present normal interictal EEG with occasional frontally dominant 3-6 Hz s/w or ps/w. Simple Febrile Normal interictally. Shows Sz type (usually TC). [studystack.com]

The EEG may be normal at the time of the initial febrile seizures, but when the myoclonus starts, generalized spike-and-wave or polyspike-and-wave discharges occur. [euroformhealthcare.biz]

Familial Febrile Seizures Type 5

Her neurologic status and development were fully normal, and the interictal EEG did not show any specific abnormality. [ncbi.nlm.nih.gov]

Familial Focal Epilepsy with Variable Foci

Diagnosis Brain imaging is expected to be normal. EEG, ictal and interictal, show focal epileptic discharges in different areas. [doctorstrizhak.com]

[…] myoclonus, photosensitivity AR GLYCTK D-glyceric acidaemia, glycine encephalopathy AR ARX Allelic with XLAG, dyskinesia, BG hyperintensities X 7% CDKL5 Atypical Rett syndrome, normal [rch.org.au]

Developmental and Epileptic Encephalopathy Type 5

Atypical Glycine Encephalopathy

Developmental and Epileptic Encephalopathy Type 7

Benign Familial Neonatal Epilepsy (BFNE): Seizure onset in the first week of life in a normal, otherwise healthy, neonate. Interictal EEG background is continuous. [kcnq2.org]

EEG was normal. [germaco.net]