Purpose: Glut-1 deficiency syndrome (Glut-1 DS) is caused by the deficiency of the major glucose transporter in cerebral microvessels.
Methods: 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.
Results: 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.
Conclusions: Pre- and postprandial EEG recordings offer a simple screening test for Glut-1 DS.