West syndrome (or infantile spasms) is characterised by the association of clusters of axial spasms, psychomotor retardation and an hypsarrhythmic interictal EEG pattern. It is the most frequent type of epileptic encephalopathy. It may occur in otherwise healthy infants and in those with abnormal cognitive development.
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infantile spasms; Infantile spasms syndrome; intellectual disability-hypsarrhythmia syndrome; tonic spasms with clustering, arrest of psychomotor development and hypsarrhythmia on EEG; West's syndrome; X-linked infantile spasm syndrome; X-linked infantile spasms
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