[Electro-neurological correlations in early stages of post-traumatic comatose states. II. The EEG at the transition stage to, and at the full stage of the traumatic apallic syndrome (author's transl)].

The EEG patterns of 36 patients (out of 140 patients with severe brain injury) in the transition stage from midbrain to the traumatic apallic syndrome and/or in the full stage of apallic syndrome are compared with the EEGs in the acute stages of traumatic secondary midbrain syndrome. There is a clear decrease in the variety of EEG-patterns, especially of sleep or sleep-like potentials and alternating patterns, and a loss of rectivity in patients in the alternating patterns, and a loss of reactivity in patients in the transition stage. Therefore these changes not only indicate the increasing rostro-caudal deterioration, but also indicate the increasing rostro-caudl deterioration, but also the transition to the traumatic apallic syndrome. in these cases the EEG-changes mentioned above don't carry a worse prognosis. The reduction of different EEG patterns is less marked in patients in the full stage of the apallic syndrome. The variety of EEg patterns increases by the onset of sleep and waking activity, the appearance of spindles and of long runs of delta.