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Depression in Parkinson's disease. A positron emission study
H A Ring1, C J Bench, M R Trimble
1Institute of Neurology, London.
The British Journal of Psychiatry : the Journal of Mental Science
|September 1, 1994
Summary
Depression in Parkinson's disease (PD) is linked to dysfunction in the medial prefrontal cortex, a brain region also affected in primary depression. This finding suggests shared neural pathways for depression in both conditions.
Area of Science:
- Neuroscience
- Neurology
- Psychiatry
Background:
- Investigated biological correlates of depression in idiopathic Parkinson's disease (PD).
- Hypothesized regional brain dysfunction in PD with depression, involving areas implicated in primary depression.
Purpose of the Study:
- To identify shared neural underpinnings of depression in Parkinson's disease and primary depression.
- To test for regional brain dysfunction in patients with PD and comorbid depression.
Main Methods:
- Utilized positron emission tomography (PET) to measure regional cerebral blood flow (rCBF).
- Compared rCBF patterns in patients with PD and major depression (n=10) versus PD alone (n=10).
- Results were compared with data from patients with primary depression and normal controls from a prior study.
Main Results:
- Observed bilateral decreases in rCBF in the anteromedial medial frontal cortex and cingulate cortex (Brodmann's areas 9 and 32) in depressed PD patients.
- This pattern of reduced rCBF in depressed PD patients overlapped with findings in patients with primary depression.
- Groups were matched for age, sex, and symptom severity.
Conclusions:
- The medial prefrontal cortex is a common area of neural dysfunction in both primary depression and depression associated with Parkinson's disease.
- Findings suggest shared neurobiological mechanisms contribute to depressive symptoms in these distinct conditions.