[Variability of the EEG in the acute period of comas resulting from cerebral circulatory disorders].

Up to now there has been a general consensus in the literature that the development of the comatose state is attended with the appearance on the EEG of high amplitude slow activity. The article shows that the acute period of coma is not always associated with this regularity. A large part of the EBG presents low amplitude irregular activity with occasional rapid fluctuations. In some cases there are phenomena characteristic of the physiological nocturnal sleep. The data obtained make it possible to consider the role of different synchronizing and desynchronizing cerebral systems in the genesis of electrical activity in the period of coma and are of certain interest in terms of studying the neurophysiological mechanisms of comatose states.