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Late-onset depression: can EEG abnormalities help in clinical sub-typing?
Eishi Motomura1, Koji Inui, Shinji Nakase
1Department of Psychiatry, Mie University School of Medicine, Edobashi, Tsu, Mie 514-8507, Japan. motomura@clin.medic.mie-u.ac.jp
Journal of Affective Disorders
|March 1, 2002
Summary
Electroencephalogram (EEG) abnormalities, specifically temporal slow waves, are more frequent in late-onset depression patients, suggesting a potential link to cerebrovascular dysfunction and a distinct clinical subgroup.
Area of Science:
- Neurology
- Psychiatry
- Gerontology
Background:
- Late-onset depression (LOD) is a significant clinical challenge.
- Mild cerebrovascular dysfunction may contribute to LOD.
- EEG abnormalities can indicate cerebrovascular changes.
Purpose of the Study:
- To investigate the prevalence of EEG abnormalities in patients with LOD.
- To correlate EEG findings with clinical characteristics of LOD.
Main Methods:
- 51 outpatients (age ≥ 50) with major depression (DSM-IV) and 32 controls underwent EEG.
- EEG analysis focused on basic rhythms and temporal slow waves.
- Depression severity was assessed using the Hamilton Rating Scale for Depression (HAMD).
Main Results:
- Temporal slow waves were observed in 47% of depressed patients versus 22% of controls.
- Patients with temporal slow waves had fewer family history of mood disorders (P<0.05).
- Specific HAMD scores differed: lower guilt (P<0.01), higher somatic symptoms (P<0.01) and hypochondriasis (P<0.01).
Conclusions:
- EEG-detected temporal slow waves may indicate vulnerability to LOD, possibly due to subtle cerebrovascular lesions.
- These findings suggest a distinct clinical subgroup within heterogeneous LOD.
- Results should be considered within the study's sample limitations.