EEG Features of Glut‐1 Deficiency Syndrome

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Abstract
Glut-1 deficiency syndrome (Glut-1 DS) is caused by the deficiency of the major glucose transporter in cerebral microvessels. We performed pre- and postprandial EEG recordings in two unrelated children with Glut-1 DS with developmental delay and seizures predominantly in the morning before breakfast. Extensive epileptiform discharges observed in the fasting state were improved markedly by food intake, as documented in EEG recordings 1 and 2 h after a meal. The ratio of cerebrospinal fluid glucose to blood glucose was decreased in both children. Glut-1 deficiency was confirmed by biochemical and molecular genetic investigations. Pre- and postprandial EEG recordings offer a simple screening test for Glut-1 DS.