The possibility of characterizing subgroups of depressive disorders by biological markers was studied by means of the dexamethasone suppression test (DST), the 24-hr urinary free cortisol (UFC), the growth hormone response to the insulin tolerance test (ITT), and polygraphic sleep recordings. Forty-five hospitalized patients suffering from a moderate to severe nonpsychotic major depressive disorder were clinically subdivided into three groups: endogenous (n = 20), neurotic (n = 19), and "ambiguous" (n = 6). These clinical diagnoses were supplemented by operational diagnostic tools, namely, the Research Diagnostic Criteria (RDC) and the Newcastle Scale. The different diagnostic procedures exhibited a high degree of correspondence. Whereas the results of the ITT were normal in almost all patients, 20% of all patients were dexamethasone nonsuppressors and more than half of the patients showed a shortened REM latency. Both markers did not reveal any specificity for the endogenous subtype. A significant influence of weight loss on the DST and the excretion of UFC was evident.
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