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THE CATECHOLAMINE HYPOTHESIS OF AFFECTIVE DISORDERS: A REVIEW OF SUPPORTING EVIDENCE
JOSEPH J. SCHILDKRAUT
Am J Psychiatry 1965;122:509-522.
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Clinical Associate, Section on Psychiatry, Laboratory of Clinical Science, National Institute of Mental Health, Bethesda, Md.

1966 by The American Psychiatric Association

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Abstract

The "catecholamine hypothesis of affective disorders" proposes that some, if not all, depressions are associated with an absolute or relative decrease in catecholamines, particularly norepinephrine, available at central adrenergic receptor sites. Elation, conversely, may be associated with an excess of such amines. Evidence supporting this hypothesis was reviewed.Data from pharmacological studies, mainly in animals, suggest that the actions of both major classes of antidepressant drugs are mediated through the catecholamines. The monoamine oxidase inhibitors increase brain concentrations of norepinephrine while imipramine-like agents potentiate the physiological effects of norepinephrine. Reserpine, a drug which can cause clinical depression, depletes catecholamines, but other amines may also be involved in its mechanism of action. A rigorous extrapolation from pharmacological studies to pathophysiology clearly cannot be made. Clinical studies relevant to the catecholamime hypothesis are limited and the findings are inconclusive.It is not possible, therefore, to confirm definitively or to reject the catecholamine hypothesis on the basis of data currently available. In our present state of knowledge, however, the catecholamine hypothesis is of considerable heuristic value, providing the investigator and the clinician with a frame of reference integrating much of our experience with those pharmacological agents which produce alterations in human affective states.

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