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  • Title: A further investigation of basal HPT axis function in unipolar depression: effects of diagnosis, hospitalization, and dexamethasone administration.
    Author: Maes M, D'Hondt P, Blockx P, Cosyns P.
    Journal: Psychiatry Res; 1994 Feb; 51(2):185-201. PubMed ID: 8022953.
    Abstract:
    Hypothalamic-pituitary-thyroid (HPT) axis function was assessed in depressed subjects 1 and 8 days after hospital admission, and after the administration of 1 mg of dexamethasone. Plasma levels of thyroid stimulating hormone (TSH), free triiodothyronine (FT3), and free thyroxine (FT4) were measured by ultrasensitive assays in 16 patients with minor depression, 15 patients with simple major depression, and 13 patients with melancholia. The postdexamethasone adrenocorticotropic hormone (ACTH) (intact 1-39 molecule) and cortisol values were determined. Basal TSH values were significantly lower in melancholic patients than in patients with minor and simple major depression on the day after admission and 1 week later. Basal TSH values determined 1 week after admission were significantly and negatively related to FT4 values and severity of depression. There were no significant differences in basal TSH, FT3, and FT4 values obtained on day 1 and day 8 after hospital admission. Dexamethasone administration had a significant suppressant effect on basal TSH and FT3 values. Patients who failed to suppress cortisol after the dexamethasone suppression test (DST) exhibited significantly less suppression of basal TSH values than did DST cortisol suppressors.
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