hypsarhythmia

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]

hyp·sa·rhyth·mi·a

(hip'să-ridh'mē-ă)
The abnormal and characteristically chaotic electroencephalogram in patients with infantile spasms.
[G. hypsi, high, + a- priv. + rhythmos, rhythm]
References in periodicals archive ?
EEGs were divided into three groups according to presence of epileptic activity; the first group: epileptic activity is present, the second group: focal or diffuse epileptic activity is present, the third group: multiofocal epileptic activity or hypsarhythmia is present.
Electroencephalogram findings: While no epileptic activity was found on EEG in five (23.8%) of our patients, partial epileptic activity was found in 14 patients (66.6), hypsarhythmia was found in 8 patients (38%), diffuse epileptic activity was found in 2 patients (9.5%) and multifocal epileptic activity was found in 2 patients (9.5%) (Table 3).
When the initial EEG findings of our patients were examined, good seizure prognosis was observed in 67% of the patients with a normal initial EEG and poor seizure prognosis was observed in 67% of the patients who had severe findings including multifocal epileptic activity and hypsarhythmia on the initial EEG.