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Abstract
Dysthymic disorder (DD) is a chronic subsyndromal depressive condition that has generated
increasing interest since its formal introduction into the psychiatric nomenclature
in 1980. Although DD was included among the affective disorders in DSM-III, this classification
was controversial. Some clinical and family studies support an association between
DD and major depression disorder (MDD), but there has been little additional research
firmly establishing the diagnostic validity of DD or clarifying its relation to MDD
and to personality disorders. In this article, the literature on the biology of DD
is reviewed. Studies of rapid eye movement (REM) latency, electrodermal activity,
and the thyroid axis show similarities between DD and MDD, but the findings are mixed.
Other investigations, including the Dexamethasone Suppression Test (DST), catecholamines,
and several other electroencephalogram (EEG) sleep variables, show more consistent
differences between DD and MDD. These findings suggest that DD manifests primarily
trait characteristics of depression, thus differentiating it from the state characteristics
of MDD. The methodological problems and implications of these studies, and suggestions
for future research, are discussed.
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Article info
Publication history
Received in revised form:
October 24,
1990
Received:
June 26,
1990
Identification
Copyright
© 1991 Published by Elsevier Inc.