Hypsarrhythmia is very chaotic and disorganized brain electrical activity with no recognizable pattern, whereas a normal brain electrical activity shows clear separation between each signal and visible pattern. It is an abnormal interictal pattern, consisting of high amplitude and irregular waves and spikes in a background of chaotic and disorganized activity seen on electroencephalogram (EEG), and frequently encountered in infants diagnosed with infantile spasms, although it can be found in other conditions such as tuberous sclerosis.
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| - Hypsarrhythmie (de)
- Hipsarritmia (es)
- Hypsarrhythmia (en)
- Ipsaritmia (it)
- Hypsarythmie (fr)
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| - Hipsarritmia es un término médico que se emplea para designar un determinado patrón anormal en el electroencefalograma. Aparece en ciertos tipos de epilepsia infantil, principalmente, aunque no de forma exclusiva, en el síndrome de West. (es)
- L'ipsaritmia è un'attività cerebrale anormale, caratterizzata da una disorganizzazione globale dell'attività di fondo. Nel EEG si registrano onde lente di alto voltaggio, associate ad onde acute anomale a tipo punta. Il tracciato cambia irregolarmente ad ogni istante, sia in durata sia in forma, senza mai prendere un aspetto ritmico ripetitivo. L'ipsaritmia è condizione necessaria per la diagnosi della Sindrome di West. Raramente persiste oltre i 24 mesi di età. (it)
- Als Hypsarrhythmie, von altgriechisch ὕψος hypsos, deutsch ‚Höhe‘, ‚Anhöhe‘ und ἄρρυϑμος arrhythmos, deutsch ‚unrhythmisch‘, wird in der Neurologie ein EEG-Muster bezeichnet, in dem sich eine epileptische Aktivität in Form einer kontinuierlichen Folge unregelmäßig hoher, langsamer Deltawellen mit wechselnd (desynchron) auftretender Einstreuung von kurzdauernden Spitzenpotentialen („Spikes“) und/oder steilen Abläufen (Sharp waves) zeigt. Dauer und Lokalisation (fokal oder multifokal) sind dabei unsymmetrisch, das EEG-Bild wirkt chaotisch, Variationen sind die Regel: „Die Hypsarrhythmie tritt nie als rhythmisches und gut organisiertes Muster auf“ (Gibbs & Gibbs, 1952). (de)
- Hypsarrhythmia is very chaotic and disorganized brain electrical activity with no recognizable pattern, whereas a normal brain electrical activity shows clear separation between each signal and visible pattern. It is an abnormal interictal pattern, consisting of high amplitude and irregular waves and spikes in a background of chaotic and disorganized activity seen on electroencephalogram (EEG), and frequently encountered in infants diagnosed with infantile spasms, although it can be found in other conditions such as tuberous sclerosis. (en)
- L'hypsarythmie est une anomalie de l'électroencéphalogramme constituée d'une activité continue d’ondes cérébrales lentes, de pointes et d’ondes aigües asynchrones et irrégulières changeant à chaque instant de durée et de topographie — focale, multifocale, généralisée — sans jamais prendre un aspect répétitif rythmique. Ce genre de tracé se rencontre principalement dans le syndrome de West. (fr)
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| - A comparison of an awake, resting , normal EEG with a hypsarrhythmia EEG. The hypsarrhythmia EEG is from a 4-month old girl with cryptogenic West syndrome. In it high amplitude waves and spikes are present, randomly appearing and with no topographical distribution identified; also, there is no frequency nor amplitude gradient, indicating a highly disorganized brain activity. Although having this seemingly chaotic EEG, the patient didn't show any clinical seizures while being recorded. (en)
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| - From Greek Hyps= Height (en)
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| - Als Hypsarrhythmie, von altgriechisch ὕψος hypsos, deutsch ‚Höhe‘, ‚Anhöhe‘ und ἄρρυϑμος arrhythmos, deutsch ‚unrhythmisch‘, wird in der Neurologie ein EEG-Muster bezeichnet, in dem sich eine epileptische Aktivität in Form einer kontinuierlichen Folge unregelmäßig hoher, langsamer Deltawellen mit wechselnd (desynchron) auftretender Einstreuung von kurzdauernden Spitzenpotentialen („Spikes“) und/oder steilen Abläufen (Sharp waves) zeigt. Dauer und Lokalisation (fokal oder multifokal) sind dabei unsymmetrisch, das EEG-Bild wirkt chaotisch, Variationen sind die Regel: „Die Hypsarrhythmie tritt nie als rhythmisches und gut organisiertes Muster auf“ (Gibbs & Gibbs, 1952). Die Hypsarrhythmie hat diagnostische Relevanz beim West-Syndrom (BNS-Epilepsie) und wurde 1952 erstmals von dem US-amerikanischen Neurologen, klinischen Neurophysiologen und Epileptologen Frederic A. Gibbs und seiner deutschstämmigen Ehefrau Erna Leonhardt Gibbs beschrieben. (de)
- Hypsarrhythmia is very chaotic and disorganized brain electrical activity with no recognizable pattern, whereas a normal brain electrical activity shows clear separation between each signal and visible pattern. It is an abnormal interictal pattern, consisting of high amplitude and irregular waves and spikes in a background of chaotic and disorganized activity seen on electroencephalogram (EEG), and frequently encountered in infants diagnosed with infantile spasms, although it can be found in other conditions such as tuberous sclerosis. Gibbs and Gibbs described hypsarrhythmia (originally spelled with one 'r') in 1952 as "...random high voltage waves and spikes. These spikes vary from moment to moment, both in time and in location. At time they appear to be focal, and a few seconds later they seem to originate from multiple foci. Occasionally the spike discharge becomes generalized, but it never appears as a rhythmically repetitive and highly organized pattern that could be confused with a discharge of the petit mal or petit mal variant type". In most cases of infantile spasms, hypsarrhythmia either disappears or improves during a cluster of spasms and/or REM sleep. Hypsarrhythmia rarely persists beyond the age of 24 months. (en)
- Hipsarritmia es un término médico que se emplea para designar un determinado patrón anormal en el electroencefalograma. Aparece en ciertos tipos de epilepsia infantil, principalmente, aunque no de forma exclusiva, en el síndrome de West. (es)
- L'hypsarythmie est une anomalie de l'électroencéphalogramme constituée d'une activité continue d’ondes cérébrales lentes, de pointes et d’ondes aigües asynchrones et irrégulières changeant à chaque instant de durée et de topographie — focale, multifocale, généralisée — sans jamais prendre un aspect répétitif rythmique. Ce genre de tracé se rencontre principalement dans le syndrome de West.
* Possible alternance avec un aspect quasi normal : fragmentation.
* Après l’âge de 2 ans, organisation en tracé de pointes ondes lentes plus synchrones différent de l’hypsarythmie.
* L'hypsarythmie est absente dans 45 % des cas de spasmes infantiles (ou syndrome de West).
* L’hypsarythmie peut n’exister que pendant la somnolence ou le sommeil léger.
* Portail de la médecine (fr)
- L'ipsaritmia è un'attività cerebrale anormale, caratterizzata da una disorganizzazione globale dell'attività di fondo. Nel EEG si registrano onde lente di alto voltaggio, associate ad onde acute anomale a tipo punta. Il tracciato cambia irregolarmente ad ogni istante, sia in durata sia in forma, senza mai prendere un aspetto ritmico ripetitivo. L'ipsaritmia è condizione necessaria per la diagnosi della Sindrome di West. Raramente persiste oltre i 24 mesi di età. (it)
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