EEG Periodic Complexes: Causes & Reasons

Possible Causes for EEG Periodic Complexes

The diagnosis of SSPE is based on characteristic clinical and EEG findings (periodic complexes) and demonstration of elevated antibody titres against measles in cerebrospinal [ncbi.nlm.nih.gov]

Measles antibodies were positive in CSF and the EEG showed slow periodic complexes. This unusual radiological presentation has never been described in SSPE. [ncbi.nlm.nih.gov]

EEG shows periodic complexes with high-voltage diphasic waves occurring synchronously throughout the recording. [msdmanuals.com]

Creutzfeldt Jakob Disease

Extrapyramidal muscular rigidity, myoclonus, and characteristic periodic electroencephalographic (EEG) complexes were observed comparatively late in the illness, and some [ncbi.nlm.nih.gov]

Subsequent MRI findings of symmetrical lesions in the basal ganglia (nucleus caudatus, putamen) on the 13th week and EEG with periodic sharp wave complexes (PSWC) in frontal [ncbi.nlm.nih.gov]

Periodic sharp wave complexes every 1 to 2 seconds over slowed background were found on EEG, and MRI showed cerebellar and bifrontal cortical T2/FLAIR/DWI hypersignal without [ncbi.nlm.nih.gov]

Progressive Rubella Panencephalitis

[…] recordings showed epileptiform abnormalities, long latency diffuse periodic complexes and–during interferon therapy and simultaneously with a temporary clinical improvement–the [idexlab.com]

[…] peculiarities of the case are emphasized: 1) the clinical symptomatology and the evolution (myoclonus, lack of cerebellar impairment) could suggest the diagnosis of SSPE; 2) the EEG [idexlab.com]

Sporadic Creutzfeldt-Jakob Disease

Early detection of periodic sharp wave complexes on EEG by independent component analysis in patients with Creutzfeldt - Jakob disease. [medigraphic.com]

Infectious Mononucleosis Encephalitis

Periodic EEG complexes in infectious mononucleosis encephalitis. [jnnp.bmj.com]

Abstract The presence of periodic EEG complexes in patients with an acute viral encephalitis is generally held to suggest that infection is due to herpes simplex. [jnnp.bmj.com]

Serial EEGs showed periodic, predominantly left-sided slow wave complexes occurring every 4 to 5 seconds, which disappeared with clinical resolution of the illness. [jnnp.bmj.com]

Creutzfeldt-Jakob Disease Heidenhain Variant

The EEG was analyzed according to the following criteria: periodic sharp-wave complexes were diagnosed when the record contained strictly periodic cerebral potentials, the [jamanetwork.com]

EEG was suggestive of paracentral slowing with no periodic sharp wave complexes. Laboratory investigations including CSF analysis were all normal. [dovepress.com]

Results of electroencephalographic (EEG) recordings were classified into three categories: periodic sharp-wave complexes (PSWCs), paroxysmal discharges (PDs), and diffuse [content.iospress.com]

Generalized Herpes Simplex Infection of the Newborn

EEG recordings were made on 7 patients: 5 had clinical symptoms compatible with encephalitis, and in these the EEG showed periodic complexes, consisting of triangular or sharp [adc.bmj.com]

Epilepsia Partialis Continua

periodic sharp wave complexes (PSWCs) at later stage. [ncbi.nlm.nih.gov]

Celesia, GG Pathophysiology of periodic EEG complexes in subacute sclerosing panencephalitis. Electroencephalogr Clin Neurophysiol 1973;35:293–300. [journals.sagepub.com]

[…] showed generalized periodic sharp wave complexes. [karger.com]

Carbon Monoxide-Induced Parkinsonism

The initial EEG (A) reveals periodic bursts of high-amplitude, slow-wave complexes. (Onset of the complexes is indicated by solid arrows; offset, by open arrows.) [slideplayer.com]

[…] bursts of high-amplitude, slow-wave complexes with normal background rhythm Electroencephalogram (EEG) at the time of presentation in the neurology clinic (A) and 3 months [slideplayer.com]

periodic complexes High Ab titers in serum and CSF Atrophy, neuronal loss, lymphocytic infiltration, demyelination, gliosis, NFTs Nuclear oligodendroglial inclusions, staining [slideplayer.com]

Phencyclidine Intoxication

[…] interrupted every few seconds by periodic slow-wave complexes. [ncbi.nlm.nih.gov]

The similarity of the EEG to that of deep ketamine anesthesia suggested intoxication with a ketamine-related (phenylcyclohexylamine) drug. [ncbi.nlm.nih.gov]

When first seen, the patient was in a coma, initially distinguished only by nystagmus, waxy rigidity of the extremities, and an EEG with a widespread, sinusoidal theta rhythm [ncbi.nlm.nih.gov]

Versive Seizure

Polygraphic recordings in subacute sclerosing panencephalitis of the periodic EEG complexes. Neuropatidiatrie, 7:52-65, 1980. 33) Lennox, W. G. and Lennox, M. A. [molcom.jp]

*EEG findings may include spikes, polyspikes-&-wave complexes in ictal or interictal period. TONIC SEIZURE *Consist of contraction of axial musculature of whole body. [slideshare.net]

(A) Seizure (Sz) onset with low-voltage fast activity emerging from periodic spiking in the mesial temporal contacts. (B) Sample EEG from early seizure. [slideplayer.com]

Variably Protease-Sensitive Prionopathy

Diagnosis is difficult, as pathognomonic signs on MRI such as cortical ribboning or hockey stick sign, periodic sharp wave complexes on EEG, and tests for 14-3-3 protein and [encyclopedia.uia.org]

Autosomal Recessive Isolated Optic Atrophy

The EEG exhibits periodic complexes with generalized bilateral, usually synchronous and symmetrical sharp and slow wave complexes of high amplitude (greater than 500 uV), [neuroweb.us]

Focal Epilepsy - Speech Disorder - Mental Retardation

Complex Febrile Szs between 5-15 minutes. Focal and reoccurring within a 24 hour period. No EEG correlation. [studystack.com]

EEG consists of complex bursts of spikes and sharp waves, with periods of discontinuity; and the burst-suppression pattern, which may later evolve into a hypsarrhythmia pattern [euroformhealthcare.biz]

[…] and sleep spindles on the available frontal EEG channels. [semmelweis.hu]

Periventricular Laminar Heterotopia

Case report A 12 year old girl presented with four episodes of complex seizures over a period of one year. Clinical examination was unremarkable. [imj.ie]

The EEG study revealed presence of frequent epileptiform discharges over bilateral parietotemporal regions. [imj.ie]

Prion Disease

CONCLUSIONS: Each of these prion diseases is characterized by a rapidly progressive dementia with myoclonus, periodic complexes on EEG, and spongiform change without PrP plaque [ncbi.nlm.nih.gov]

The characteristic EEG finding of periodic triphasic complexes seen in most classic CJD patients has not been reported in any of the vCJD cases to date. [doi.org]

Herpes Simplex Encephalitis

Typical findings include diffuse slowing, focal temporal changes, periodic complexes, and periodic lateralizing epileptiform discharges (PLEDS). [casemed.case.edu]

The EEG showed biparietooccipital delta waves without periodic complexes. [journals.lww.com]

Electroencephalography (EEG) is very sensitive and is abnormal in 80% of patients with HSE. [casemed.case.edu]

Temporal Lobe Tumor

A verbal auditory agnosia with mutism had evolved over a 3 month period after onset of refractory partial complex seizures at 5 years. [pediatricneurologybriefs.com]

EEG showed left temporal and right occipital spike and S/W discharges. Language comprehension was absent on the Peabody Picture Vocabulary test and Token test. [pediatricneurologybriefs.com]

Eosinophilic Gastritis

[…] showed generalized periodic sharp wave complexes. [karger.com]

Two months after the onset of EPC, he developed akinetic mutism with irregular startle myoclonus, and his EEG showed generalized periodic sharp wave complexes (Fig. 1d). [karger.com]

[…] wave complexes on EEG, a positive immunoassay for 14-3-3 protein in his CSF, and characteristic MR findings. [karger.com]

Focal-Onset Impaired-Awareness Seizure

Abstract We describe a patient in whom the only electrographic manifestation of a complex partial seizure recorded by video-EEG telemetry was periodic lateralized epileptiform [ncbi.nlm.nih.gov]

Familial Dyskinesia and Facial Myokymia

The EEG exhibits periodic complexes with generalized bilateral, usually synchronous and symmetrical sharp and slow wave complexes of high amplitude (greater than 500 uV), [neuroweb.us]

The characteristic electroencephalogram (EEG) features seen in sporadic Creutzfeldt-Jakob disease (CJD) (i.e, generalized bi- or triphasic periodic sharp wave complexes) are [movementdisorders.org]

Epilepsy with Generalized Tonic-Clonic Seizures

Polygraphic recordings in subacute sclerosing panencephalitis of the periodic EEG complexes. Neuropatidiatrie, 7:52-65, 1980. 33) Lennox, W. G. and Lennox, M. A. [molcom.jp]

Senile Chorea

(e.g., periodic sharp wave complexes during illness) Laboratory (e.g., 14-3-3 protein in CSF ) MRI (→ abnormalities in caudate nucleus and/or putamen ) Systemic lupus erythematosus [amboss.com]

[…] prion particles) Rapid progression Motor symptoms Myoclonus Hypokinesia Ataxia, nystagmus Neuropsychiatric symptoms (e.g., sensory disturbances, mutism, sleep disorders ) EEG [amboss.com]

Juvenile Myoclonic Epilepsy

We included all patients that their EEG showed the characteristic findings of JME (generalized 3.5-6 Hz single, bifid and polyspikes slow - waves complexes on normal brain [jneuro.com]

The study includes all patients (3523 Sudanese patients) referred to the two centres during a period extended from March 2003 to May 2012. [jneuro.com]

Benign Adult Familial Myoclonic Epilepsy

The EEG exhibits periodic complexes with generalized bilateral, usually synchronous and symmetrical sharp and slow wave complexes of high amplitude (greater than 500 uV), [neuroweb.us]

Electrophysiologic Features The EEG activity consists of complex bursts of asynchronous spikes and irregular, arrhythmic sharp waves and slow waves lasting 1 to 5 seconds [neupsykey.com]

New-Onset Refractory Status Epilepticus

An electroencephalogram (EEG) performed on his second day, off sedation, revealed continuous periodic sharp and slow wave complexes at around 1Hz with intermittent high amplitude [icmcasesummaries.com]

Multiple seizure types on EEG and periodic discharges have been described that include—in decreasing order of frequency—unilateral, bilaterally independent, generalized, and [practicalneurology.com]

The EEG traces show a general slowing of the background activity, more evident on the right hemisphere, where periodic sharp complex are evident, often time-locked with myoclonic [journal.frontiersin.org]

Epigastric Hernia

[…] showed generalized periodic sharp wave complexes. [karger.com]

Two months after the onset of EPC, he developed akinetic mutism with irregular startle myoclonus, and his EEG showed generalized periodic sharp wave complexes (Fig. 1d). [karger.com]

[…] wave complexes on EEG, a positive immunoassay for 14-3-3 protein in his CSF, and characteristic MR findings. [karger.com]

Lafora Disease

We herein report an unusual case of LBD who showed generalized periodic epileptiform discharges in EEG. [annalsofian.org]

Keywords: Lafora body disease (LBD), periodic complexes, progressive myoclonic epilepsy How to cite this article: Jain RS, Gupta A, Gupta PK, Agrawal R. [annalsofian.org]

Frequency of spike wave complexes also increase with the progression of illness.[1],[3] Periodicity in epileptiform discharges has not been frequently described in LBD. [annalsofian.org]

Bickerstaff Brainstem Encephalitis

Typical periodic bilateral triphasic sharp wave complexes on EEG did not appear until the 16th week after initial symptom presentation. [medworm.com]

Meningeal Disorder

period sharp wave complex progressive deterioration and death within 6-12 months incubation period 2-25 years there does appear to be some genetic susceptibility in one [brainaacn.org]

Gerstmann-Straussler-Scheinker; kuru; fatal familial insomnia Creutzfeldt-Jakob rapidly progressive dementia, exaggerated startle response, myoclonus, visual distortion, ataxia EEG [brainaacn.org]