[The concept of postconcussional syndrome (author's transl)].

The author shows that postconcussional syndromes develop along three lines: somatic functional troubles, character and affective troubles, efficiency troubles. Most patients present such symptoms within six months after the trauma. In some patients, the syndrome remains for several reasons. The presence of objective sensory troubles, the weakness of socio-economic status and the lack of professional qualification, a psychiatric history and a history of emotional shock constitute precipitating factors. The necessity to determine, along these criteria, a high risk population to be followed psychologically after the hospitalisation is underlined.