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Abstract
Parkinson's disease (PD) is frequently accompanied by symptoms of depression and anxiety.
However, the relationship between anxiety and depression has not been rigorously defined
in these patients. In this study, 42 patients with PD and 21 matched medical controls
were evaluated using DSM-III-R criteria and a variety of psychiatric rating scales.
Twelve (29%) PD patients but only one medical control had a formal anxiety disorder
diagnosis. Of the 12 patients with PD who had an anxiety disorder diagnosis, 11 (92%)
had a comorbid depressive disorder diagnosis. Of the 18 patients with a depressive
disorder, 12 (67%) also had an anxiety disorder diagnosis. Furthermore, a stepwise
regression analysis found that the depression measure explained 44% of the variance
in anxiety measures whereas neither the severity of illness variables nor the levodopa
dose contributed significantly to the variance. This study suggests that the excess
anxiety found in PD patients is unlikely to be primarily a psychologic reaction to
the illness or a side effect of levodopa treatment. Rather, we suggest that anxiety
and depression are related manifestations of the underlying neurochemical changes
of PD itself.
Keywords
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Article info
Publication history
Received in revised form:
May 14,
1993
Received:
February 5,
1993
Identification
Copyright
© 1993 Published by Elsevier Inc.