hypsarrhythmia


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hypsarrhythmia

 [hip″sah-rith´me-ah]
a term for an electroencephalographic abnormality sometimes observed in infants, with random high-voltage slow waves and spikes arising from multiple foci and spreading to all cortical areas; the disorder is characterized by spasms or quivering spells, and is commonly associated with mental retardation.

hyp·sa·rhyth·mi·a

, hypsarrhythmia (hip'să-rith'mē-ă),
The abnormal and characteristically chaotic electroencephalogram commonly found in patients with infantile spasms.
[G. hypsi, high, + a- priv. + rhythmos, rhythm]

hypsarrhythmia

(hĭp″săr-ĭth′mē-ă) [Gr. hypsi, high, + a-, not, + rhythmos, rhythm]
An abnormal electroencephalographic pattern of persistent generalized slow waves and very high voltage. Clinically it is often associated with infantile spasm and progressive mental deterioration.
References in periodicals archive ?
West syndrome is characterized by cognitive deterioration along with infantile spasms and hypsarrhythmia or modified hypsarrhythmia on EEG.11 Children with IS require extensive evaluation to identify the etiology and an EEG is essential to confirm the diagnosis of infantile spasm.
Video electroencephalogram revealed hypsarrhythmia consisting of bilateral high-amplitude irregular slow waves mixed with multifocal spikes or polyspikes in the interictal period, and clusters of spasms and transient tonic attacks were recorded.
However, burst-suppression patterns and hypsarrhythmia on EEG predicted more severe disease and suggest that epilepsy might complicate cases of congenital Zika infection, they said.
Generalized epileptic activity and hypsarrhythmia were found in 4 and 6 patients in Group II respectively.
The late forms of chronic seizures can appear as tonic seizures, myoclonic jerks, infantile spasms, multifocal epileptiform activity, or hypsarrhythmia on EEG.
The initial electroencephalogram demonstrated a disorganized, high-amplitude background and multifocal, interictal epileptiform discharges consistent with hypsarrhythmia. She was treated with vigabatrin with excellent clinical and electrophysiologic response.
[1] It is an epileptic encephalopathy characterised by epileptic spasms, electroencephalographic (EEG) evidence of hypsarrhythmia and developmental delay or regression.
3) * Epilepsy, particularly infantile spasms (infantile spasms do not have to be accompanied by hypsarrhythmia) * Cortical dysplasias such as cortical tubers, SENs or white-matter migration lines on MRl scan (these are unlikely to be visible on CT scan) (Fig.
Electroencephalography showed no epileptic discharge including hypsarrhythmia.
Five infants initially had hypsarrhythmia, indicating highly disorganized brain activity, and had spasms and neuromotor delays.
EEG was evaluated for abnormalities of background, spikes, polyspikes, slowing, hypsarrhythmia and EEG pattern specific for any specific syndrome were looked.
Hypsarrhythmia pattern was observed on electroencephalogram (EEG) and synthetic adrenocorticotropic hormone (ACTH) treatment was initiated (Figure 1).