Unusual variants of infantile spasms.

During evaluation of video-electroencephalograms (EEGs) performed in our laboratory, we identified 11 patients who had unusual repetitive movements that appeared to be variants of infantile spasms. Movements included yawning, facial grimacing, eye movements, and transient focal motor activity. These symptoms coincided with generalized attenuation, slow-wave transients, or other EEG ictal changes characteristic of infantile spasms. The background EEGs showed true or modified hypsarrhythmia. This series of patients shows that infantile spasms may be extremely subtle and clinically atypical. Patients who have these variants may or may not also have typical infantile spasms. In some patients, the seizures appear to be time-related or medication-induced modifications of more typical infantile spasms.