West Syndrome: West syndrome, also known as infantile spasm, involves a group of symptoms including spasms in infants, retardation of psychomotor development, and a particular abnormality on the electroencephalogram (EEG) known as hypsarrhythmia.
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.
West Syndrome is characterized by infantile spasms, developmental regression, and a specific pattern on electroencephalography (EEG) testing called hypsarrhythmia (chaotic brain waves).
An epileptic syndrome characterized by the triad of infantile spasms, hypsarrhythmia, and arrest of psychomotor development at seizure onset.
West syndrome is a type of epilepsy characterized by spasms, abnormal brain wave patterns called hypsarrhythmia and sometimes mental retardation.
 See also: Arrhythmia, Symptom, Seizure, Infantile Spasms, Asthma
  
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