Cortisol circadian rhythm alterations in psychotic major depression.
Level 4 - case-series / case-control
Case-control study comparing clinical subgroups and healthy controls
PubMed 16458262 · doi:10.1016/j.biopsych.2005.10.014
What was done
Researchers compared hypothalamic-pituitary-adrenal (HPA) axis activity across three groups: patients with psychotic major depression (PMD), patients with non-psychotic major depression (NPMD), and healthy control subjects. Assessments included depression and psychosis rating scales along with measures of overnight cortisol and adrenocorticotropin levels. Group differences were analyzed using analysis of variance, and regression analyses were performed to evaluate contributions of symptoms to cortisol levels.
What was found
The abstract reports no numerical values, exact effect sizes, or p-values. PMD patients had higher evening cortisol levels than NPMD patients or healthy controls, who did not differ from each other. Regression analyses indicated that depression severity and the combination of depressive and psychotic symptoms were significant contributors to variance in evening cortisol.
Why it matters
The findings indicate that psychotic depression involves distinct circadian disruption of the HPA axis, specifically elevated cortisol during typically quiescent evening hours, resembling abnormalities observed in early Cushing's syndrome.
Limits
The abstract omits sample size, participant demographic characteristics, medication status, quantitative hormone measurements, and exact p-values. The cross-sectional case-control design precludes causal conclusions.
Cited by
- supports Elevated end-of-day or late-day cortisol spikes are associated with depression and anxiety.