DST non-suppression predicts suicide after attempted suicide

Area of Science:

• Neuropsychiatry
• Endocrinology
• Mood Disorders

Background:

• The hypothalamic-pituitary-adrenal (HPA) axis is implicated in mood disorders and suicide.
• Non-suppression in the dexamethasone suppression test (DST) is often linked to increased suicide risk.
• Previous studies suggest a correlation between DST non-suppressor status and suicide, but its predictive value in specific subgroups requires further investigation.

Purpose of the Study:

• To evaluate the predictive utility of the DST for suicide.
• To assess if DST non-suppressor status predicts suicide in depressed inpatients, considering those with and without a prior suicide attempt.

Main Methods:

• A historical cohort study of 382 psychiatric inpatients diagnosed with mood disorders.
• Patients admitted between 1980 and 2000 underwent the DST.
• Follow-up for causes of death over a mean period of 18 years.

Main Results:

• Overall, no statistically significant difference in suicide risk was found between DST suppressors and non-suppressors.
• A history of suicide attempts was a significant predictor of suicide.
• In patients with a history of suicide attempts, non-suppressor status on the DST was significantly associated with a higher risk of suicide.

Conclusions:

• The DST alone may not be a universal predictor of suicide in all depressed inpatients.
• However, DST non-suppressor status appears to be a valuable predictor of suicide risk specifically within the subgroup of depressed patients with a history of suicide attempts.
• HPA axis hyperactivity, indicated by non-suppressor status, is a significant risk factor for suicide in this particular population.