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The dexamethasone suppression test and suicide attempts
A Schmidtke1, P Fleckenstein, H Beckmann
1Department of Psychiatry, University of Würzburg, Federal Republic of Germany.
Acta Psychiatrica Scandinavica
|March 1, 1989
Summary
The dexamethasone suppression test (DST) did not significantly correlate with suicidal behavior in patients, even when controlling for suicide attempt methods and diagnoses. This finding challenges previous hypotheses linking DST results to suicide risk.
Area of Science:
- Neuroscience
- Psychiatry
- Clinical Psychology
Background:
- The dexamethasone suppression test (DST) is a biomarker historically investigated for its association with suicidal behavior.
- Previous hypotheses suggested a link between DST non-suppression and increased suicide risk, particularly in depressed patients.
- Understanding neuroendocrine correlates of suicidal behavior is crucial for improving risk assessment and treatment strategies.
Purpose of the Study:
- To investigate the covariation between dexamethasone suppression test (DST) results and suicidal behavior in patients with a history of suicide attempts.
- To control for confounding factors such as suicide methods, psychiatric diagnoses, and time factors in the analysis.
- To compare DST results in patients with suicide attempts against control groups of psychiatric patients and those with endogenous depression.
Main Methods:
- Examined DST results in 44 patients with at least one prior suicide attempt.
- Controlled for suicide methods, diagnoses, and time factors.
- Utilized control groups: 82 psychiatric patients and 69 patients with endogenous depression.
- Performed chi-square tests using ICD-9 suicide classifications and subcategories.
- Assessed Hamilton Rating Scale for Depression profiles for DST suppressors and non-suppressors.
Main Results:
- No significant relationship was found between DST results and acute suicide attempts.
- Patients using 'soft' suicide methods were often DST suppressors, but this covariation was not statistically significant.
- The sensitivity of the DST for suicide attempts in patients with endogenous depression was 52%.
- No significant differences were observed in the history of suicide attempts between DST suppressors and non-suppressors.
- Hamilton Rating Scale for Depression profiles showed no significant differences in symptoms or acute suicide risk between DST suppressors and non-suppressors.
Conclusions:
- The dexamethasone suppression test (DST) does not appear to be a reliable predictor of suicidal behavior, even in patients with a history of attempts.
- The study failed to establish a significant covariation between DST results and suicide attempts, irrespective of method or diagnosis.
- Further research may be needed to explore other biological or psychological markers for assessing suicide risk.