Figure 1
EEG was performed using the international 10 20 electrode system, reformatted to longitudinal bipolar montage; electromyography (EMG) electrodes were attached to the deltoid muscles bilaterally. (A) At 18 months of age, interictal EEG during the awake state showed symmetrical hypsarrhythmia. (B) At 18 months of age, ictal EEG showed a paroxysmal fast wave superimposed on widespread slow waves that appeared periodically, corresponding to the movement of raising both upper limbs. EMG revealed a crescendo-decrescendo sequence with a diamond-shaped configuration associated with diffuse triphasic slow waves. LDEL: left deltoid muscle; RDEL: right deltoid muscle.