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[Early EEG in 300 cerebral concussions].

The EEGs of 300 concussed patients were examined at the last 48 h after trauma; 166 were younger than 20 years old and 134 were between 20 and 40 years old. Amongst the youngest group 145 cases had a benign concussion with 24% alterations, and 21 cases had a mild concussion with 81% alterations. Amongst the oldest group, 93 cases had a benign concussion with 15% alterations and 41 cases had a mild concussion with 41% alterations. The mostly transient EEG abnormalities are slowing, focal abnormalities or generalized bursts. Slowing is the most frequent abnormality in the youngest and focal abnormalities are most frequently observed in the mild concussion group.