Hypsarrhythmia

Hypsarrhythmia

Hypsarrhythmia is abnormal interictal high amplitude waves and a background of irregular spikes seen in electroencephalogram, mostly in infant diagnosed with infantile spasms. They both vary in duration and size, have no rhythm or pattern and can alternate between focal or multifocal. In most cases of infantile spasms hypsarrhythmia disappear during a cluster of spasms and/or REM sleep.

In simple terms, it is a very chaotic and disorganized brain wave behavior with no recognisable pattern, where a normal EEG shows clear separation between each signals and visible pattern.

Hypsarrhythmia rarely persists beyond the age of 24 months.


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  • hypsarrhythmia — hyps·ar·rhyth·mia or hyps·arhyth·mia .hips ā rith mē ə n an abnormal encephalogram that is characterized by slow waves of high voltage and a disorganized arrangement of spikes, occurs esp. in infants, and is indicative of a condition that leads… …   Medical dictionary

  • hypsarrhythmia — n. a severe abnormality on an EEG (see electroencephalography) that demonstrates a chaotic pattern of brain activity. It is usually characteristic of infantile spasms …   The new mediacal dictionary

  • hypsarrhythmia — …   Useful english dictionary

  • Гипсаритмия (Hypsarrhythmia) — аномальная хаотическая активность головного мозга, наблюдающаяся при энцефалографии у больных с детскими судорогами. Источник: Медицинский словарь …   Медицинские термины

  • hypsarhythmia, hypsarrhythmia — The abnormal and characteristically chaotic electroencephalogram commonly found in patients with infantile spasms. [G. hypsi, high, + a priv. + rhythmos, rhythm] …   Medical dictionary

  • generalized flexion epilepsy — hypsarrhythmia …   Medical dictionary

  • ГИПСАРИТМИЯ — (hypsarrhythmia) аномальная хаотическая активность головного мозга, наблюдающаяся при энцефалографии у больных с детскими судорогами …   Толковый словарь по медицине

  • PEHO syndrome — Classification and external resources OMIM 260565 DiseasesDB 33582 PEHO syndrome is a progressive encephalopathy with ede …   Wikipedia

  • West syndrome — Classification and external resources ICD 10 G40.4 ICD 9 345.6 …   Wikipedia

  • Infantile spasms — A seizure disorder of infancy and early childhood with the onset predominantly in the first year of life of myoclonic seizures, hypsarrhythmia (abnormal, chaotic electroencephalogram), and mental retardation. The spasms are sudden, brief… …   Medical dictionary

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