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Affective disorders and cerebral vascular disease
1Department of Psychiatry, Johns Hopkins University School of Medicine, Baltimore, MD 21205.
Insights
Depression affects 30-50% of stroke survivors and is linked to left-brain lesions. Mania is rare but associated with right-brain lesions and other factors, offering insights into affective disorders.
Area of Science:
- Neuroscience
- Neurology
- Psychiatry
Background:
- Major and minor depressive disorders affect 30-50% of stroke patients.
- These mood disorders can persist for over a year without treatment.
- Depression is not strongly linked to impairment severity or demographics but often to specific brain lesions.
Purpose of the Study:
- To investigate the occurrence and characteristics of mood disorders following stroke.
- To explore the association between lesion location and mood disorders post-stroke.
- To understand the potential mechanisms underlying post-stroke mood disturbances.
Main Methods:
- Review of empirical studies on stroke-related mood disorders.
- Correlation analysis between lesion location (left frontal, left basal ganglia, right limbic-connected areas) and mood disorder presentation.
- Examination of potential etiological factors including neurotransmitter dysfunction and genetic predisposition.
Main Results:
- Major depression in stroke patients is associated with left frontal or left basal ganglia lesions and pre-existing subcortical atrophy.
- Post-stroke mania is rare and linked to right hemisphere limbic-connected lesions plus predisposing factors.
- Serotonergic or noradrenergic dysfunction may contribute to depressive disorders.
Conclusions:
- Specific brain lesion locations are associated with distinct mood disorders after stroke.
- The lesion method is valuable for studying the neurobiological mechanisms of affective disorders.
- Further research into neurotransmitter roles and genetic factors is warranted.
Abstract:
Empirical studies have recently demonstrated that major and minor depressive disorders occur in 30-50% of stroke patients, and last more than one year without treatment, although they do respond to tricyclic antidepressants. These mood disorders are not strongly associated with severity of impairment, demographic characteristics, social supports or prior personal history, but major depression is often strongly associated with left frontal or left basal ganglia lesions and pre-existing subcortical atrophy. While the aetiology of these mood disorders remains unknown, serotonergic or noradrenergic dysfunction may play a role. Mania is a rare complication of stroke: the clinical presentation and response to treatment are usually the same as mania without brain injury. Post-stroke mania is strongly associated with both a right hemisphere lesion in a limbic-connected area and a second predisposing factor, such as genetic loading for affective disorder, pre-existing subcortical atrophy or seizure disorder. This disorder may be mediated through frontal lobe dysfunction. The lesion method represents a potentially fruitful technique for investigating the mechanisms of affective disorder.