Should Plasma or Urinary MHPG be Measured in Psychiatric Research? A Critical Comment

Abstract
Many experimental findings suggest that disturbances of noradrenergic neurons in the CNS are involved in the pathogenesis of depressive disorders. Moreover, evidence indicates that adaptive changes of central noradrenergic neurons contribute to the biochemical mechanism of action of most anti-depressive treatments (Goodwin, 1984; Johnstone, 1982). Accordingly, assessing the activity of central noradrenergic neurons in depressive patients has become important in psychiatric research.