Abnormal EEG: Causes & Reasons

Possible Causes for Abnormal EEG

EEG was abnormal in 67%; focal EEG abnormalities were noted in 32.8%. Coexisting psychiatric disorders (PDs) were found in 33.3%. [ncbi.nlm.nih.gov]

We compared the occurrence and involvement of posterior electrodes for focal abnormalities and generalised spike-wave activity in the EEG outside photic stimulation between [ncbi.nlm.nih.gov]

Voltage asymmetry as the focal EEG abnormalities was observed in 4 patients. [neurologyindia.com]

Idiopathic Generalized Epilepsy

Variations of EEG abnormalities are evident between different electroclinical syndromes. [ncbi.nlm.nih.gov]

Seventy one (61.7%) had an abnormal EEG. [annalsofian.org]

We report a child with idiopathic generalized epilepsy who developed myoclonic seizures and had an abnormal electroencephalogram (EEG) when oral suspension of OXC was introduced [ncbi.nlm.nih.gov]

Myoclonic-Astatic Epilepsy

Information also comes from tests such as: EEG (electroencephalogram): children with EMAS may have normal EEGs at first, but most have abnormal EEGs that show frequent synchronous [epilepsy.com]

EEG abnormalities disappeared in all patients within 4 years since the onset. [ncbi.nlm.nih.gov]

Family studies suggest a major genetic influence as up to two thirds of relatives have seizures, or electroencephalographic (EEG) abnormalities. [ethos.bl.uk]

Rolandic Epilepsy

RESULTS: Fourteen studies were identified: seven using a cross-sectional design (six active EEG abnormalities; one EEG remission) and seven longitudinal studies (abnormal [ncbi.nlm.nih.gov]

We postulated that a developmental abnormality presumably results in abnormal EEG background activity findings. [ncbi.nlm.nih.gov]

[…] to RD in the awake record, a combination of spike rate and extended periods of high-frequency paroxysmal EEG abnormalities may predict seizure recurrence in RE. [ncbi.nlm.nih.gov]

Epilepsia Partialis Continua

He has a normal scalp electroencephalogram (EEG) but abnormal intracranial EEG, with synchronized periodic lateralized epileptiform discharges. [ncbi.nlm.nih.gov]

EEG (n-21) was abnormal in all but one, however it was non-specific in 7. [ncbi.nlm.nih.gov]

Imaging showed abnormality only in five patients and EEG was abnormal in four patients. [ncbi.nlm.nih.gov]

Developmental and Epileptic Encephalopathy Type 2

 Inter-Ictal EEG  Initial -20% show normal BG with photoparoxysmal discharges of spikes/ polyspikes-slow waves.  Within 1 year, EEG - abnormal slow BG with frequent asymmetrical [slideshare.net]

An electroencephalogram (EEG) is very abnormal in these cases. [verywell.com]

abnormality. [ncbi.nlm.nih.gov]

Lennox-Gastaut Syndrome

This suggests that the frequent seizures and abnormal EEG activity that is seen between seizures can lead to or be associated with cognitive and behavioral problems. [epilepsy.com]

The three patients had normal laboratory studies including imaging studies (CT and MRI) but consistently abnormal EEGs with Lennox-Gastaut pattern. [ncbi.nlm.nih.gov]

It can control seizures and improve EEG abnormalities. Early improvement in the EEG background and a reduction in IEDs may be predictors of a patient's response to diet. [ncbi.nlm.nih.gov]

Focal-Onset Impaired-Awareness Seizure

If a patient with psychiatric illness has seizure-like episodes, an abnormal EEG may help confirm the diagnosis. [currentpsychiatry.com]

The two remaining patients had SPECT abnormalities and major ictal EEG foci in entirely different areas. [ncbi.nlm.nih.gov]

Of 19 patients with mesial temporal sclerosis (MTS), 13 exhibited an MR abnormality at the site of pathology as determined by EEG and surgery. [ncbi.nlm.nih.gov]

Epilepsy with Generalized Tonic-Clonic Seizures

Interictal EEG abnormalities (spike and wave discharges, (SW), photoparoxysmal discharges (PPD), and nonspecific changes) were significantly less common in Nigerian patients [ncbi.nlm.nih.gov]

Pre-operative electrical stimulation of the acoustic nerve, however, exhibited a good nerve function with no evidence of abnormal waveforms in the electroencephalogram (EEG [ncbi.nlm.nih.gov]

Antiepileptic medications had no effect, and interictal and ictal scalp electroencephalography (EEG) recordings demonstrated bilateral electrical abnormalities. [thejns.org]

Developmental and Epileptic Encephalopathy Type 6

6 months 8/47 (17) Abnormal interictal EEG in months 7–12 45/90 (50) Abnormal interictal EEG in months 13–24 34/55 (62) Abnormal interictal EEG in months 25–36 30/38 (79) [doi.org]

Infants with Dravet syndrome suffer from developmental regression and there is good evidence that some of this is due to uncontrolled seizures and abnormal EEG activity (an [currents.plos.org]

This syndrome was recognizable from the second or third seizure in the first year of life, although epileptiform EEG abnormalities were lacking until the age of 11 to over [ncbi.nlm.nih.gov]

Neuronal Ceroid Lipofuscinosis Type 7

abnormality 0002353 Generalized myoclonic seizures 0002123 Global developmental delay 0001263 Juvenile onset Signs and symptoms begin before 15 years of age 0003621 Mental [rarediseases.info.nih.gov]

Language development deficit Late-onset speech development Poor language development Speech and language delay Speech and language difficulties Speech delay [ more ] 0000750 EEG [rarediseases.info.nih.gov]

Epilepsy

Contralateral interictal and ictal EEG abnormalities were observed. [ncbi.nlm.nih.gov]

It is also uncertain if focal epileptiform EEG abnormalities may be associated with stable cognitive impairment. [ncbi.nlm.nih.gov]

EEG. [aurorahealthcare.org]

Temporal Lobe Epilepsy

EEG activity, and MTLE-HS. [ncbi.nlm.nih.gov]

In both patients, nonspecific EEG abnormalities (ie, diffuse, irregular spike-and-wave activity) preceded the appearance of HS on MRI by 2 years, suggesting an insidious advance [ncbi.nlm.nih.gov]

Upon admission, necessary investigations were performed including CT scan and EEG. Her CT was normal but EEG was grossly abnormal. [ncbi.nlm.nih.gov]

Severe Neonatal-Onset Encephalopathy with Microcephaly

EEG abnormality MedGen UID: 56235 • Concept ID: C0151611 • Finding Abnormality observed by electroencephalogram (EEG), which is used to record of the brain's spontaneous electrical [ncbi.nlm.nih.gov]

The main clinical features and signs of all epileptic encephalopathies are: Refractory seizures Severe EEG abnormalities Developmental delay/regression or intellectual disability [centogene.com]

[…] with SB, hypotonia, microcephaly and abnormal electroretinogram. [ingentaconnect.com]

Herpes Simplex Encephalitis

The patient's clinical course improved with the resolution of seizures and EEG abnormalities. [ncbi.nlm.nih.gov]

Encephalitis is characterized by fever, neurologic deficits, seizures, pleocytosis, and neuroimaging and EEG abnormalities. [nejm.org]

Focal seizures, hemiparesis, aphasia, conjugate eye deviation, and focal electroencephalographic (EEG) and angiographic abnormalities indicated a more focal involvement of [annals.org]

Subacute Sclerosing Panencephalitis

The symptoms of SSPE can include the following: Coma Death Seizures Irritability Dementia Blindness Spasticity Memory loss Optic atrophy Hyperthermia Unsteady gait Abnormal [disabled-world.com]

(EEG), and by magnetic resonance imaging (MRI) or computed tomography (CT) that shows brain abnormalities. [merckmanuals.com]

EEG Myoclonic jerks Cortical blindness Brain inflammation Behavioral changes Very tense muscles Progressive dementia Involuntary movements Intellectual deterioration Homeostasis [disabled-world.com]

Encephalopathy

[…] of EEG in the evaluation of abnormal states of consciousness has been demonstrated 3. [scielo.br]

Characteristic, though unspecific, findings were abnormal EEG (90%) and CSF (80%). [thyroid-info.com]

[…] electroencephalogram (EEG), which records the electrical signals in the brain, to check for abnormal brain waves blood tests to confirm the presence of bacteria or viruses [rchsd.org]

Stroke

Key words: abnormal EEG, non-epileptiform abnormalities, slow activity. [scielo.br]

Patients with lacunar strokes had no EEG abnormalities. [ncbi.nlm.nih.gov]

Abnormal results Abnormal EEG results may be due to: epilepsy or another seizure disorder abnormal bleeding or hemorrhage sleep disorder encephalitis (swelling of the brain [healthline.com]

Neuronal Ceroid Lipofuscinosis Type 8

[…] visual loss Abnormality of the nervous system Cerebellar ataxia Cerebellar atrophy Cerebral atrophy Delayed speech and language development Developmental regression EEG abnormality [ncbi.nlm.nih.gov]

[from OMIM] Show allHide all Abnormal cellular phenotype Curvilinear intracellular accumulation of autofluorescent lipopigment storage material Abnormality of the eye Progressive [ncbi.nlm.nih.gov]

Developmental and Epileptic Encephalopathy Type 18

Diseases related with Muscular hypotonia and EEG abnormality In the following list you will find some of the most common rare diseases related to Muscular hypotonia and EEG [mendelian.co]

Katherine Brooke Howell Abstract The severe epilepsies of infancy (SEI) are a group of infantile-onset seizure disorders characterised by frequent seizures, abnormal EEG and [minerva-access.unimelb.edu.au]

Unfortunately, few studies have attempted to correlate EEG abnormalities, including spike discharge frequency, with neuropsychological deficits. [emedicine.medscape.com]

Creutzfeldt Jakob Disease

However, an abnormal EEG and MRI at end-stage of disease were finally consistent with CJD. [ncbi.nlm.nih.gov]

The absence of the 14-3-3 protein or the characteristic abnormalities on EEG does not rule out CJD. [web.archive.org]

All patients had severe sleep EEG abnormalities with loss of sleep spindles, very low sleep efficiency, and virtual absence of REM sleep. [neurology.org]

GLUT1 Deficiency Syndrome

Absence seizures appeared at the age of 4 years, and electroencephalogram (EEG) showed irregular discharges of diffuse epileptic abnormalities. [ncbi.nlm.nih.gov]

Showing of 40 | 80%-99% of people have these symptoms Abnormal erythrocyte morphology 0001877 Ataxia 0001251 Dystonia 0001332 EEG abnormality 0002353 Encephalopathy 0001298 [rarediseases.info.nih.gov]

The EEG may also be abnormal, but these abnormalities are not specific to this condition and do not help to make the diagnosis of GLUT1 deficiency. [epilepsy.org.uk]

Hepatic Encephalopathy

In patients with cirrhosis and HE, oral LOLA reduces serum ammonia and improves clinical manifestations of HE, including EEG abnormalities.10 LOLA, however, is not available [the-hospitalist.org]

Electroencephalography (EEG) may also be done. EEG can detect abnormalities in brain activity but cannot distinguish hepatic encephalopathy from other possible causes. [merckmanuals.com]

abnormalities, and mental status with rifaximin compared with lactulose.6 Studies comparing rifaximin and lactulose, either alone or in combination, have demonstrated that [the-hospitalist.org]

Focal Seizure

EEGs should include a study performed during sleep to maximize abnormalities. [aafp.org]

EEG abnormalities have been reported in most patients with focal epilepsy and ictal abdominal pain [ 1, 4 ]. [ijponline.biomedcentral.com]

One half of the patients have abnormal EEGs, often with a photoconvulsive effect. [aafp.org]

Northern Epilepsy

Moreover the EEG continues to be abnormal long after the seizure remission and it is a matter of debate whether these EEG abnormalities correlate with the cognitive disability [omicsonline.org]

EEG was abnormal in six of the nine patients and demonstrated slowing of background activity with/without generalized epileptiform discharges. [neurologyindia.com]

Hypsarhythmia is a very high-voltage, disorganized pattern of EEG abnormality. The hypsarrhythmia pattern is not present during the entire EEG in many cases. [childneurologyfoundation.org]

Metabolic Encephalopathy

[…] or damage electroencephalogram (EEG) test to measure the electrical activity in your brain The treatment for encephalopathy varies depending on what caused it. [healthline.com]

The following tests may be done: Blood tests—usually show high blood ammonia levels and other abnormalities related to the failing liver Electroencephalogram ]]> (EEG)—may [empowher.com]

or infections) Doppler ultrasound (abnormal blood flow to tissues or abscesses) Encephalogram or EEG (brain damage or abnormal brain wave patterns) Autoantibody analysis [medicinenet.com]

Delirium

Abnormal EEG readings would not be expected in patients with psychotic disorders or depression. However, slowing may occur in patients with dementia. [aafp.org]

Usually abnormal Usually normal Reversibility Reversible Usually irreversible The differential diagnoses listed here are not exhaustive. [amboss.com]

An exception is patients with delirium tremens, where the EEG shows fast activity. [aafp.org]

Rubinstein-Taybi Syndrome

RESULTS: EEG abnormalities were observed in 76% (16/21) of patients. [ncbi.nlm.nih.gov]

EEG findings Possible increased risk of neural tumors (medulloblastoma, neuroblastoma, meningioma) Possible increased risk of thickened filum terminale, tethering of the [clinicaladvisor.com]

[…] more ] 0004411 Dislocated radial head 0003083 Duane anomaly 0009921 Duplication of phalanx of hallux Duplication of big toe bone Duplication of great toes [ more ] 0010066 EEG [rarediseases.info.nih.gov]

MERRF Syndrome

EEG was abnormal in six of the nine patients and demonstrated slowing of background activity with/without generalized epileptiform discharges. [bioline.org.br]

[…] for cerebral atrophy; EEG for seizure activity; blood serum testing for elevated lactate levels; and hearing and vision testing. [secure.ssa.gov]

In contrast to sleep-related myoclonus, myoclonic seizures occur during wakefulness and are associated with abnormal cortical discharges on EEG. [emedicine.medscape.com]

Kleine-Levin Syndrome

The Klein-Levin syndrome with intermittent abnormality in the EEG. Electroencephalogr Clin Neurophysiol. 1969 Dec;27(6):601–604. [ncbi.nlm.nih.gov]

[…] is also abnormal). [doi.org]

Abstract Diurnal EEGs of a 17 year old male with the Kleine-Levin syndrome revealed moderate diffuse abnormalities and stage REM at sleep onset during attacks. [ncbi.nlm.nih.gov]