The British Journal of Psychiatry 146: 294-296 (1985)
© 1985 The Royal College of Psychiatrists
Does the dexamethasone suppression test predict antidepressant treatment success?
A Coppen, P Milln, J Harwood and K Wood
The 1 mg dexamethasone suppression test (DST) was carried out in patients
with a major depressive illness in order to establish whether the results
of this test, given before antidepressant or ECT treatment, could predict
eventual therapeutic outcome. No significant difference could be detected
in overall therapeutic improvement between those patients with a normal or
abnormal DST response respectively, based on the 50 ng/ml cortisol cut-off
point. However, using 100 ng/ml as a cut- off point it was found that
patients with an abnormal DST response (i.e. a post-DST plasma cortisol
concentration greater than or equal to 100 ng/ml) responded significantly
better than those who had a normal DST response. These observations were
statistically significant for those patients receiving antidepressants and
in the combined treatment groups of those patients receiving either
antidepressants or ECT.