Cortisol secretion and dexamethasone response in depression.
The authors administered 2 mg of dexamethasone at 11:00 p.m. to 37 unmedicated hospitalized endogenously depressed patients and assessed their plasma cortisol response at 4:00 and 11:00 p.m. the next day. In addition, on nondexamethasone days 26 of these patients had mean 24-hour plasma cortisol concentration determinations from samples taken at 30-min intervals and 32 had plasma determinations from a single sample taken at 4:00 and 11:00 p.m. Mean 24-hour plasma cortisol concentration was elevated in 50%; only 7 of the 26 were dexamethasone resistant, and 6 of these 7 were hypersecretors. The authors suggest that dexamethasone resistance reflects the abnormality of cortisol hypersecretion in depression and that the 2-mg dexamethasone suppression test is a highly specific but not very sensitive indicator of hypersecretion.
D000328:Adult; D003866:Depressive Disorder / Q000503:physiopathology*; D003907:Dexamethasone / Q000494:pharmacology*; D005260:Female; D006801:Humans; D006854:Hydrocortisone / Q000097:blood / Q000378:metabolism*; D008297:Male; D008875:Middle Aged
D003907:Dexamethasone; D006854:Hydrocortisone