EEG Normal: Causes & Reasons

Possible Causes for EEG Normal

Abstract Twenty-three EEG studies in eight patients with "locked-in" syndrome were reviewed. The EEG was either normal or minimally slow in all except one patient. [ncbi.nlm.nih.gov]

This explains the discrepancy between a normal EEG (only minor abnormalities) and presumed unconsciousness. [ncbi.nlm.nih.gov]

In patients with locked-in syndrome, electroencephalography (EEG) shows normal sleep-wake patterns. [msdmanuals.com]

Aromatic L-Amino Acid Decarboxylase Deficiency

Brain imaging and EEG revealed normal findings in most patients that are not helpful in diagnosing AADC deficiency. [annalsofian.org]

[…] electroencephalography (EEG) recordings. [annalsofian.org]

Cranial magnetic resonance imaging, which performed because of involuntary non-epileptic dystonic movements resembling epileptic spasms, was normal. [annalsofian.org]

Benign Familial Infantile Epilepsy Type 4

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]

Diagnostic procedures All relevant tests are normal. Inter-ictal EEG Normal. Ictal EEG Focal discharges. [epilepsy.com]

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]

Familial Infantile Myoclonic Epilepsy

Diagnostic procedures All relevant tests are normal. Inter-ictal EEG Normal. Ictal EEG Focal discharges. [epilepsy.com]

Inter-ictal EEG Normal. Ictal EEG Generalized polyspike or spike and slow-wave discharges. [epilepsy.com]

The interictal EEG is normal. [neupsykey.com]

Conversion Disorder

This paper outlines the successful psychoanalytic treatment of a latency-aged boy with severe conversion disorder. Details of clinical treatment are presented. As no tested treatment has yet been found that reliably treats chronic conversion in children, this case is of importance in demonstrating the usefulness[…] [ncbi.nlm.nih.gov]

Acquired Epileptic Aphasia

After 3 months of treatment, behavior was nearly normal, she could talk, and waking EEG was normal. [docslide.com.br]

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

The EEG may return to normal and seizures become less frequent or stop altogether. [epilepsy.org.uk]

Focal Epilepsy - Speech Disorder - Mental Retardation

When a seizure happens during an EEG, the normal pattern of brain activity that is seen on the EEG reading changes, and different brain activity can be seen. [epilepsysociety.org.uk]

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

The EEG may return to normal and seizures become less frequent or stop altogether. [epilepsy.org.uk]

Abdominal Epilepsy

We found 111 (74%) children with an abnormal EEG and 39 (26%) children with normal EEG. [pediatricneurosciences.com]

The patient did well on valproic acid therapy and EEG was normal 1 month after beginning of the treatment. [ncbi.nlm.nih.gov]

An MRI of the brain was performed, which was found to be normal. Figure 1 Awake EEG record showing high-voltage generalised slowing. [doi.org]

Rolandic Epilepsy

EEG is normal except for prominant spike that emerges of the left central area during sleep. [medbullets.com]

The EEG has centro-temporal spikes with accentuation in sleep – therefore a sleep deprived or sleep EEG is important if the awake EEG is normal. [pennsw.com.au]

Occasionally, if the first EEG is normal, the hospital doctor will arrange a sleep-deprived EEG recording. [epilepsy.org.uk]

Myoclonic-Astatic Epilepsy

Initial EEG was normal in 30%. When seizures ceased, EEG background and epileptiform abnormalities persisted in 17 and 58%, respectively. [ncbi.nlm.nih.gov]

Interictal EEG, often normal at onset, can become very disorganised. Outcome is unpredictable. [neuroscienceandgenetics.it]

EEG. Background. The background may be normal or show generalized slowing. Background biparietal theta is usually seen. [medlink.com]

Developmental and Epileptic Encephalopathy Type 3

Other patterns such as burst suppression; hemispheric asymmetry; or theta – pointu alternans are more helpful Benign familial neonatal seizures - Interictal EEG Normal or [brainscape.com]

The seizures were controlled with dextromethorphan (20 mg/kg), and a suppression-burst pattern in EEG was reverted to relatively normal background activity. [ncbi.nlm.nih.gov]

His first sleep EEG recorded after onset of seizure was normal. [ncbi.nlm.nih.gov]

Idiopathic Generalized Epilepsy

The electroencephalography (EEG) was characterized by generalized spike-wave activity and photosensitivity; eye opening lead to complete EEG normalization. [thieme-connect.com]

Idiopathic generalized epilepsy (IGE) is characterized by bilateral synchronous spike-wave discharges on electroencephalography (EEG) but normal clinical MRI. [ncbi.nlm.nih.gov]

All had normal neuroimaging studies. Two patients had been previously treated with carbamazepine, which led to a partial response in one patient. [ncbi.nlm.nih.gov]

Epilepsia Partialis Continua

Inter-ictal EEG Normal initially but soon after deteriorates, with high-amplitude focal or diffuse slow waves often dominating in one hemisphere. [epilepsy.com]

RESULTS: Although the initial electroencephalography (EEG) was normal, independent spikes were detected in the right frontal and parietal derivations in the second EEG. [europeanreview.org]

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

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]

• EEG often normalizes when complete seizure control is achieved. 13. • TREATMENT: • Other medications that could be used for absence seizures include – Acetazolamide, [slideshare.net]

The readout will show bilateral, symmetric, and synchronous 3-Hz spikes and wave discharges against a normal EEG background, Dr. Duchowny said. [mdedge.com]

Juvenile Myoclonic Epilepsy

During a 5-year follow-up, the patient has remained seizure-free and the EEG consistently normal. [ncbi.nlm.nih.gov]

We included patients with JME with a history of predominant myoclonic seizures and at least one diagnostic EEG with normal background activity and bursts of typical ≥3-Hz [ncbi.nlm.nih.gov]

Waking interictal EEG showed a normal background activity and generalized poly-spike-and wave (PSW) discharges. [ncbi.nlm.nih.gov]

Reversible Ischemic Neurologic Deficit

Phase III patients (n = 41) had endarterectomy again monitored by EEG and stump pressure. Despite normal EEGs or stump by EEG and stump pressure. [ncbi.nlm.nih.gov]

Out of 75 patients with TIA or PRIND we selected 9 TlAs and 6 PRINDs with normal EEGs and CCTs. full recovery of neurological function, no history of amaurosis fugax and no [tandfonline.com]

Despite normal EEGs or stump pressures, all patients underwent endarterectomy with a temporary indwelling shunt. No complications occurred. [jamanetwork.com]

Focal-Onset Impaired-Awareness Seizure

Neurologic examination: normal Neuroimaging: normal Neuroimaging: normal EEG: Normal background with fast (3 to 6 Hz) generalized spike-and-wave discharges EEG: Normal background [aafp.org]

an essential study in the work-up of seizures if the EEG is normal, it does not rule out that a seizure occurred Neuroimaging e.g., CT or MRI scan of the head should be [step2.medbullets.com]

’ syndrome should include an EEG Consider video EEG for refractory epilepsy with “normal EEG” Brain Imaging Computed tomography (CT) scan, magnetic resonance imaging (MRI) [specialty.mims.com]

Childhood Absence Epilepsy

The 15 control individuals had the same characteristics of the CAE ones, but presented a normal EEG. [ncbi.nlm.nih.gov]

All patients were put on monotherapy with sodium valproate, and their long-term course was excellent with remission of absences and normalization of EEG recordings. [ncbi.nlm.nih.gov]

The interictal EEG showed a normal background activity in all children and in 11 patients the presence of FIPA specially on frontal areas. [ncbi.nlm.nih.gov]

Idiopathic Generalized Epilepsy in Childhood

EEG records showed normal baseline activity with slow wave spikes in the occipital region that disappeared or werereduced by eye opening. [analesdepediatria.org]

The results of neuroimaging studies were normal. [analesdepediatria.org]

Conclusions Our clinical and EEG findings are similar to those of ot-her published studies. [analesdepediatria.org]

Epileptic Encephalopathy with Global Cerebral Demyelination

[…] findings Normal EEG 5 Focal paroxysms 11 “Secondary bisynchronism” 10 Coma-sleep pattern 1 (;TAT findings Normal 4 Focal lesion 19 Diffuse lesion 4 7% FIG. 1. [docksci.com]

EEG, 6 0 1 5 drome angiography, pneumoencephalography, and Lennox-Gasscintigraphy were normal at the onset. [docksci.com]

After that time, the infant developed clonic seizures of the left arm, and. the EEG, previously normal, was very slow over the right hemisphere. [docksci.com]

Benign Familial Neonatal Epilepsy Type 3

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]

The EEG may be normal or show only minor abnormalities. There are many other causes for seizures, and other epilepsy syndromes that might also start at the same age. [epilepsy.org.uk]

Benign Familial Neonatal Epilepsy Type 2

By age 2, most affected individuals who had EEG abnormalities have a normal EEG reading. [medlineplus.gov]

Abnormalities on an EEG test, measured during no seizure activity, can indicate a risk for seizures. However, infants with BFNS usually have normal EEG readings. [medlineplus.gov]

Typically, seizures are the only symptom of BFNS, and most people with this condition develop normally. [medlineplus.gov]

Zopiclone Poisoning

EEG on admission showed essentially normal-structured sleep stage II, with symmetrical spindles and K complexes; following nociceptive stimulation, a poorly sustained -rhythm [semanticscholar.org]

KCNQ2-Related Disorders

[…] unlike BFNE, in which the EEG can normalize. [europeankcnq2association.com]

(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]

KCNQ2 is often associated with a pattern of burst suppression on the EEG but may have other nonspecific abnormalities and the EEG is not typically normal between seizures, [europeankcnq2association.com]

Autosomal Recessive Benign Familial Neonatal Epilepsy

[…] unlike BFNE, in which the EEG can normalize. [europeankcnq2association.com]

EEGs were normal between seizures, and children developed appropriately after seizures subsided. This usually happened later in childhood. [europeankcnq2association.com]

West Syndrome

REM sleep shows relative EEG normalization. [epilepsydiagnosis.org]

He had an EEG and it came back normal. I don't know what to do because as time has went on things have gotten worse. [community.babycenter.com]

Postoperatively, the patient has been free of infantile spasms for 12 months and the EEG has normalized. [ncbi.nlm.nih.gov]

Hyperinsulinemic Hypoglycaemia

He developed normally and, his EEG and brain CT revealed no abnormal findings. [ncbi.nlm.nih.gov]

We have to pay attention to hyperinsulinemic hypoglycaemia when we see seizures with normal EEG even in infants. [ncbi.nlm.nih.gov]

The blood sugar level was normal at that time, thus he was diagnosed as having benign infantile convulsion. [ncbi.nlm.nih.gov]

Benign Occipital Epilepsy

EEG records showed normal baseline activity with slow wave spikes in the occipital region that disappeared or werereduced by eye opening. [analesdepediatria.org]

The results of neuroimaging studies were normal. [analesdepediatria.org]

Conclusions Our clinical and EEG findings are similar to those of ot-her published studies. [analesdepediatria.org]

Juvenile Absence Epilepsy

The proportion showing normal EEG at 12 months in the lamotrigine group (6/22, 27.3%) was significantly lower than that in the valproic acid group (15/23, 65.2%) (P < 0.05 [cochranelibrary.com]

Length of follow‐up in included studies: from 1 to 4 years. see comment see comment Normalization of the EEG ‐ not reported ‐ ‐ ‐ ‐ ‐ Adverse effects (Table 1; Table 2) Ethosuximide [cochranelibrary.com]

[…] of the EEG Study population RR 2.39 (1.14 to 5.04) 45 (1 RCT) ⊕⊝⊝⊝ VERY LOW 2,3 Length of follow‐up: 12 months 273 per 1,000 652 per 1,000 (311 to 1,000) Adverse effects [cochranelibrary.com]

Frontal Lobe Epilepsy

Brain MRI and routine EEGs were normal. [mayoclinic.pure.elsevier.com]

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

Normalization of the EEG was associated with seizure freedom in seven of the 12 children (58.3%). [onlinelibrary.wiley.com]