Persistence of suppression-bursts in a patient with Ohtahara syndrome.

Early infantile epileptic encephalopathy, or Ohtahara syndrome, is characterized by tonic spasms and a suppression-burst pattern on the electroencephalography (EEG). The EEG demonstrates a suppression-burst pattern during waking and sleeping states that often evolves into hypsarrhythmia and followed later by a diffuse slow spike-wave pattern. In other patients, the EEG evolves into focal spike discharges or multiple independent spike foci. We report a 5-year-old girl with Ohtahara syndrome that persistently demonstrated tonic spasms and suppression-burst on multiple EEGs. Over her lifetime, neither hypsarrhythmia nor diffuse slow spike-wave pattern were seen. This suggests that in Ohtahara syndrome, a suppression-burst pattern can persist over a long period of time.