How do you tell difference between infantile spasms and benign myoclonic?

Seizures: Myoclonic seizures occur in children and adults with generalized epilepsy. Infantile spasms (West's syndrome), is a very uncommon form of epilepsy, that begin between 3 and 12 months of age. It is one of the “catastrophic childhood epilepsies” because of the difficulty in controlling seizures and the association with mental retardation.

EEG: Infantile spasms have a rather characteristic pattern on an EEG study.Any confusion over the proper label for a kids spasms is easily clarified by an EEG.

EEG: The EEG of a child with infantile spasms has a very disorganized pattern called hypsarrhythmia.