[Are there predictors for impulsive, homicidal-suicidal acts of violence].

Patient's statements or fears that they may "go crazy" and harm themselves or persons around them are rare, but extremely difficult for all participants to deal with. On the basis of the existing, unsatisfactory literature as well as an analysis of 196 incidents of homicidal-suicidal violence designated by German media as "running amok" and fulfilling defined criteria, we examined whether or not there are predictors for the degree of potential danger inherent in such threats. Impulsive, homicidal-suicidal acts of violence among patients with psychiatric disorders often occur in environments characterised by chronic psychosocial estrangement and isolation. Extremely distressing situations may trigger the course of violence, but the actual act is often planned during a seemingly peaceful interval. Personalities with a high affinity to weapons and a tendency toward acting out seem to increase the potential risks. Such events should be treated analogous to suicidal crises, with a strategy that takes the individual disorder into consideration. The parameters investigated in this paper are not sufficient, even in different combinations, to offer a satisfactory explanation or predict the occurrence of this extremely rare behaviour; further research is necessary.