'Bipolar disorder' in the elderly: what's in a name?

Area of Science:

• Geriatric Psychiatry
• Neurology
• Mood Disorders

Background:

• Bipolar disorder affects 1% of adults, with lower community prevalence in the elderly (0.1%) but higher morbidity (up to 10%) in care settings.
• Elderly bipolar disorder is heterogeneous, with potential distinct subtypes: late-onset bipolar (LOB) and early-onset bipolar (EOB).

Purpose of the Study:

• To review the distinct characteristics of late-onset bipolar disorder (LOB) in the elderly.
• To explore the etiopathogenesis, clinical presentation, and treatment implications of LOB compared to early-onset bipolar disorder (EOB).

Main Methods:

• Review of existing literature on late-life bipolar disorder, focusing on LOB and EOB subtypes.
• Analysis of clinical presentation, medical/neurological burden, familial factors, and neuroimaging findings.

Main Results:

• LOB patients exhibit milder manic severity but higher medical and neurological burdens compared to EOB patients.
• Increased risks of dementia and stroke are associated with late-life bipolar disorder, with potential protective effects of lithium.
• Neuroimaging reveals increased white matter hyperintensities, indicating cerebrovascular disease in late-life bipolar disorder.

Conclusions:

• Late-onset bipolar disorder, particularly LOB, may represent a distinct diagnostic entity due to differences in presentation and etiology.
• Current treatment guidelines for younger bipolar patients may not be optimal for elderly individuals with LOB.
• Further research is needed on cognitive enhancers and vascular prevention strategies for effective LOB treatment.