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State specificity of DST abnormalities in geriatric depression
B S Meyers1, S Alpert, M Gabriele
1New York Hospital-Westchester Division, Cornell University Medical Center, White Plains 10605.
Biological Psychiatry
|July 1, 1993
Summary
Treatment normalized dexamethasone suppression test (DST) results in elderly major depressives. Most non-suppressors became suppressors after treatment, correlating with clinical improvement and reduced cortisol levels.
Area of Science:
- Geriatric Psychiatry
- Neuroendocrinology
- Clinical Psychology
Background:
- Major depressive disorder (MDD) in the elderly often involves HPA axis dysregulation.
- The dexamethasone suppression test (DST) is a biomarker used to assess HPA axis function in depression.
- Previous studies suggest DST abnormalities in depression, but normalization patterns with treatment require further investigation, especially in non-demented elderly populations.
Purpose of the Study:
- To investigate the association between intensive treatment and DST normalization in physically healthy elderly patients with major depression without dementia.
- To examine the correlation between clinical improvement, cortisol levels, and DST results post-treatment.
- To explore the relationship between baseline DST status, treatment response, and specific depressive symptoms like delusional depression.
Main Methods:
- Administered pre-treatment and post-treatment dexamethasone suppression tests (DST) to elderly major depressives without dementia.
- Assessed clinical improvement and measured afternoon cortisol levels.
- Analyzed DST results (suppressor vs. non-suppressor status) and cortisol levels in relation to treatment and clinical outcomes.
Main Results:
- Sixty percent of subjects were non-suppressors at baseline, decreasing to 17% after intensive treatment.
- DST results normalized in 75% of initial non-suppressors; no initial suppressors converted to non-suppression.
- A strong correlation was found between clinical improvement and decreased afternoon cortisol levels, independent of initial suppression status.
Conclusions:
- Intensive treatment is associated with normalization of DST results in elderly patients with major depression without dementia.
- Clinical improvement in this population correlates with reduced cortisol levels, highlighting the HPA axis's role in treatment response.
- Continuous measures of cortisol may offer more nuanced insights into the relationship between depression reversal and HPA axis function than categorical DST results.