Am J Psychiatry 1986; 143:452-456
Copyright © 1986 by American Psychiatric Association
Dexamethasone suppression in dementia, depression, and normal aging
A Georgotas, RE McCue, OM Kim, WE Hapworth, B Reisberg, PM Stoll, E Sinaiko, C Fanelli and PE Stokes
Dexamethasone suppression tests (DSTs) were performed for 18 moderately
demented elderly patients, 66 depressed elderly outpatients, and 25 age-
and sex-matched healthy elderly control subjects. Seventeen percent of the
demented patients and 4% of the normal subjects were DST nonsuppressors,
compared to 38% of the total depressed group. The postdexamethasone plasma
cortisol levels of the dementia group fell between those of the normal and
the depressed subjects. In addition, demented patients had
postdexamethasone cortisol levels significantly lower than those of
depressed patients with high Hamilton depression scores. Older subjects in
all diagnostic categories, including normal subjects, had higher
postdexamethasone plasma cortisol levels.