A cluster of suicides at a London psychiatric unit.

In an epidemiologically based study, a spate of 14 suicides among current patients of a London psychiatric unit was investigated. Statistical analysis showed it to be a discrete cluster of suicides, rather than a chance occurrence. There was no evidence of direct linkage or "contagion" between the suicides. Thirteen of the patients suffered from severe, chronic mental illness and all but 2 had been known to the psychiatric unit for at least a year. Twelve used violent methods, in 8 cases jumping from a high place. Although no definite cause for the cluster could be established, it coincided with a period of uncertainty concerning the future of the hospital and with changes in and absenteeism of senior medical staff.