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 contractions of one or more muscle groups, and may be followed by a longer (less than 10 seconds) tonic phase.

Neurological abnormalities other than seizures and retardation such as cerebral atrophy, congenital abnormalities and hydrocephalus are commonly reported among children with infantile spasms.

The disease is also kown as West syndrome.

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