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Life at risk: markers of suicidality in depression.

One hundred and ten patients with Research Diagnostic Criteria (RDC) diagnoses of major depressive disorders were assessed for present or recent suicidal ideation and behavior and for suicidal acts earlier in life before current depression using the Schedule for Affective Disorders and Schizophrenia (SADS). Suicidal scores were correlated uni- and bivariately with levels of CSF monoamine metabolites (HVA, 5HIAA, MHPG), urinary MHPG, the proportion post-/predexamethasone plasma cortisol at 1100 h, and platelet MAO activity (all standardized to same sex, age, height and weight). Results indicate that all 3 monoamine metabolites and their interactions are involved in various aspects of suicidality, at least in unipolar patients. MHPG and 5HIAA (both low or both high) were involved in current or recent suicidal ideation, and low HVA was mainly associated with past potential lethality of suicidal acts. Current hypercortisolism was found in patients that earlier in life had tried to commit dangerous suicides. Bipolar patients (depressives with a history of manic or hypomanic episodes) had earlier in life significantly more, and more dangerous, suicidal attempts than the unipolars.