Suicidal subtypes, stress responsivity and impulsive aggression

Area of Science:

• Neuroendocrinology
• Psychiatry
• Behavioral Science

Background:

• Hypothalamic-pituitary-adrenal (HPA) axis dysregulation is implicated in suicidal behavior, but findings are inconsistent.
• Suicide attempters may represent a heterogeneous group, with HPA axis dysfunction relevant only in specific subgroups.
• HPA axis dysregulation is also linked to impulsivity and aggression.

Purpose of the Study:

• To investigate if subgroups of suicide attempters, categorized by impulsivity and aggression levels, exhibit differential HPA axis dysregulation.
• To explore the relationship between cortisol response during stress and distinct subgroups of suicidal behavior.

Main Methods:

• Examined baseline cortisol, total cortisol output, and cortisol reactivity in mood-disordered suicide attempters (N=35) and non-attempters (N=37).
• Utilized the Trier Social Stress Test (TSST) to assess stress response.
• Categorized suicide attempters into four subgroups based on aggression and impulsivity levels.

Main Results:

• No significant differences in overall cortisol measures were found between attempters and non-attempters.
• Cortisol stress response varied significantly among suicide attempter subgroups based on impulsivity and aggression.
• Attempters exhibiting high impulsive aggression demonstrated a more pronounced cortisol response compared to other groups and non-attempters.

Conclusions:

• This study identifies a potential stress-responsive subtype of suicidal behavior characterized by high impulsive aggression.
• Findings highlight the importance of considering subgroups within suicidal behavior for understanding HPA axis dysregulation.
• The results may aid in identifying individuals with suicidal tendencies who exhibit heightened stress reactivity.