Suicide in subtypes of primary major depression.

Among 100 consecutive suicide victims with primary major depression at the time of their suicide, 46% were found to have had bipolar II depression, 1% bipolar I disorder and 53% non-bipolar major depression. Since the lifetime prevalence rates of bipolar II and bipolar I depressions are relatively low compared to primary major non-bipolar depression, the present findings suggest that bipolar II disorder gives a particularly high risk of suicide among the different subtypes of primary major affective illness. Fifty-nine percent of the patients had medical contact during the depressive episode, but the depression was frequently undiagnosed, untreated or undertreated. The implications of these findings for suicide prevention are discussed briefly.