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Dexamethasone Suppression Test May Predict More Severe/Violent Suicidal Behavior.

Adrián Alacreu-Crespo1,2,3, Emilie Olié1,2,3, Sebastien Guillaume1,2,3

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Summary
This summary is machine-generated.

Hypothalamic-pituitary-adrenal (HPA) axis hyper-reactivity, measured by the dexamethasone suppression test (DST), indicates more severe suicide attempts. Elevated cortisol levels before and after DST can predict future suicide attempts and intent.

Keywords:
dexamethasone suppression testhypothalamic-pituitary-adrenal axisintentsalivary cortisolseveritysuicide attempt

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Area of Science:

  • Neuroendocrinology
  • Psychiatry
  • Clinical Psychology

Background:

  • The hypothalamic-pituitary-adrenal (HPA) axis is frequently dysregulated in individuals who attempt suicide.
  • Prospective studies indicate that an abnormal dexamethasone suppression test (DST) response is linked to increased suicide risk.
  • The predictive value of DST for suicide attempts, particularly considering attempt lethality, requires further clarification.

Purpose of the Study:

  • To compare pre- and post-dexamethasone suppression test (DST) cortisol levels in serious/violent versus non-serious/non-violent suicide attempters.
  • To determine if cortisol levels can predict future suicide attempts or their lethality.

Main Methods:

  • The study involved 70 recent suicide attempters, with 25 classified as serious/violent.
  • Saliva samples for cortisol measurement were collected at 8 a.m., 3 p.m., and 9 p.m. before and after DST administration.
  • Cortisol changes (Δ index) were calculated, and suicide attempt characteristics were assessed using the Risk-Rescue Ratio Scale (RRRS) and Suicidal Intent Scale (SIS).

Main Results:

  • Higher post-DST cortisol at 9 p.m. was observed in serious/violent attempters compared to non-serious/non-violent attempters (p < .010).
  • Elevated post-DST 9 p.m. cortisol correlated with lower rescue possibility (RRRS) and higher suicide severity.
  • Higher pre-DST cortisol at 8 a.m. predicted new suicide attempts (OR = 2.15), and increased cortisol Δ index at 9 p.m. was associated with higher suicide intent.

Conclusions:

  • HPA axis hyper-reactivity, indicated by DST, is a marker for violent/serious suicide attempts with reduced rescue potential.
  • Significant changes in cortisol levels post-DST may predict heightened suicide intent.
  • These findings contribute to understanding the biological markers of distinct suicide phenotypes.