Suicidality and aggressive behaviour.

Psychiatrists have always maintained that there is a relationship between aggressive behaviour and suicide in depressed patients. However, this relationship is based on inconsistent and undocumented hypotheses, not on reliable clinical experimental data. The present study was designed to investigate the relationship between aggressive behaviour assessed by means of the Buss and Durkee Hostility Inventory (BDHI), and suicide in a sample of 134 depressed out-patients. The group with a higher level of suicidal behaviour was of younger age. The association between depressive subtypes (major depression, recurrent; major depression, single episode; bipolar disorder, depressive episode; dysthymia) and suicidality was found to be statistically significant. In contrast, there was no correlation between depressive subtypes and aggressive behaviour. The relationship between suicide and guilt as measured by the BDHI suggests that, in depression, suicidal behaviour becomes part of a symptom pattern in which aggression does not appear to be the main component. The suicide dimension arises when the cognitive sphere is involved. In fact, in depression, suicide is included among the cognitive disturbances, together with guilt, paranoid and obsessive-compulsive symptoms, depersonalization/derealization and agitation.