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Late onset bipolar disorder associated with white matter hyperintensities: a pathophysiological hypothesis
Marcus Vinicus Zanetti1, Quirino Cordeiro, Geraldo F Busatto
1Laboratory of Psychiatric Neuroimaging (LIM 21), Institute and Department of Psychiatry, University of São Paulo, Brazil. marcus_zanetti@yahoo.com.br
Progress in Neuro-Psychopharmacology & Biological Psychiatry
|November 17, 2006
Summary
Late-onset bipolar disorder may arise from vascular brain changes, specifically white matter hyperintensities (WMH). These changes, common in older adults, might damage brain circuits, leading to mania in individuals with prior depression.
Area of Science:
- Neurology
- Psychiatry
- Gerontology
Background:
- Vascular depression is recognized, but late-onset bipolar disorder (LOBD) following unipolar depression is understudied.
- LOBD is clinically significant, especially in elderly patients with treatment-resistant depression.
Observation:
- A 72-year-old female presented with treatment-resistant depression from age 58, later developing rapid cycling mania.
- Brain MRI revealed significant white matter hyperintensities (WMH).
Findings:
- WMH are common in the elderly, particularly with hypertension and cerebrovascular disease.
- WMH are linked to adult-onset bipolar disorder and late-onset depression, often indicating a poorer prognosis.
- The case suggests vascular WMH may trigger LOBD by affecting frontolimbic circuits.
Implications:
- This case highlights a potential vascular etiology for late-onset bipolar disorder.
- Understanding WMH's role may improve diagnosis and treatment strategies for LOBD.
- Further research is needed to explore the link between cerebrovascular disease and bipolar disorder development.
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