MMPI, personality dysfunction and the dexamethasone suppression test in major depression

Area of Science:

• Psychiatry
• Neuroendocrinology
• Clinical Psychology

Background:

• Major depression is associated with alterations in neuroendocrine functioning.
• The dexamethasone suppression test (DST) is used to assess hypothalamic-pituitary-adrenal (HPA) axis activity.
• Personality dysfunction can co-occur with major depressive disorder.

Purpose of the Study:

• To investigate the relationship between psychopathology, personality dysfunction, and neuroendocrine functioning in major depression.
• To determine if DST suppressors and nonsuppressors differ in psychopathology or personality dysfunction.
• To identify specific psychometric markers associated with combined depression, personality dysfunction, and HPA axis dysregulation.

Main Methods:

• Examined MMPI profiles of 30 psychiatric inpatients diagnosed with major depression.
• Classified patients as DST suppressors (60%) or nonsuppressors (40%).
• Assessed for personality dysfunction based on MMPI scale T-score elevations (scales 4 & 6, or 4 & 9).

Main Results:

• No significant differences were found between DST suppressors and nonsuppressors on MMPI scales or DSM-III Axis-II diagnoses.
• 30% of the total sample met criteria for personality dysfunction based on specific MMPI T-score elevations.
• A significantly higher proportion of DST suppressors (50%) exhibited personality dysfunction compared to nonsuppressors (8%).

Conclusions:

• Certain MMPI scales can identify a subgroup of depressed patients with co-occurring personality disturbances.
• This subgroup of depressed patients with personality dysfunction also demonstrates hypothalamic-pituitary-adrenal (HPA) axis dysfunction.
• Findings suggest a link between specific psychopathological profiles, personality traits, and neuroendocrine abnormalities in major depression.