Study of ECoG, local cerebral circulation, and brain pO2 in 39 patients in the acute period of severe craniocerebral injury, as well as morphohistochemical measurements around the focus of crushing (in experiments) showed that the transitional zone is a risk zone because the "enzymatic death" of the tissue of this zone occurring at the moment of the injury predetermines extension of the areas of necrosis later on. The most effective measure is the removal not only of the detritus but also of the transitional zone of the focus within the range of tissue that had hardly suffered any changes and the inclusion of vasoactive and dehydration agents in the therapeutic complex.