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An infantile spasm (IS), also known as West Syndrome, is a specific type of seizure seen in an epilepsy syndrome of infancy and childhood. West Syndrome is characterized by infantile spasms, developmental regression, and a specific pattern on electroencephalography (EEG) testing called hypsarrhythmia (chaotic brain waves). The onset of infantile spasms is usually in the first year of life, typically between 4-8 months. The seizures primarily consist of a sudden bending forward of the body with stiffening of the arms and legs; some children arch their backs as they extend their arms and legs. The condition is usually observed in 2% of childhood epilepsies and 25% of epilepsies that start in the first year of life.
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