The authors examined the relationship between both pre-dexamethasone 8:00 AM serum cortisol level and the dexamethasone suppression test (DST) with urinary 3-methoxy-4-hydroxyphenyl glycol (MHPG) excretion in a group of fifteen men and fourteen women with unipolar depression. No significant difference was found between the mean MHPG excretion for either male or female DST suppressors or non-suppressors. No significant correlation was found between the pre-dexamethasone 8:00 AM serum cortisol level and urinary MHPG. These results do not support the hypothesis that DST non-suppression in depression is related to central noradrenergic deficiency.
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