Key points are not available for this paper at this time.
Preliminary findings suggest that levels of norepinephrine metabolites, particularly 3-methoxy-4-hydroxyphenylglycol (MHPG), excreted in urine may provide biochemical criteria for classifying at least some types of depressive disorders and possibly also for predicting the differential responses to treatment with various tricyclic antidepressant drugs.
Joseph J. Schildkraut (1973) studied this question.