Does cognitive function in older bipolar patients depend on recurrent or current mood symptoms?

Area of Science:

• Neuroscience
• Psychiatry
• Cognitive Psychology

Background:

• Cognitive impairment is a stable feature of bipolar disorder (BD), persisting even in euthymic states.
• Current mood symptoms and a history of mood episodes may exacerbate cognitive deficits, suggesting a potential neuroprogressive course in BD.
• Further research is needed to understand the impact of mood states and episode recurrence on cognitive functioning in BD.

Purpose of the Study:

• To investigate the stability of cognitive impairment in older adults with bipolar disorder (OABD).
• To examine the influence of current mood state (hypomanic, depressed, euthymic) on cognitive functioning in OABD.
• To assess the impact of recurrent mood episodes on cognitive function over a 5-year period in OABD.

Main Methods:

• Two cohorts of older adults with bipolar disorder (OABD) were studied.
• Cohort 1: Compared cognitive function across hypomanic, depressed, and euthymic states, and with healthy controls.
• Cohort 2: Compared cognitive function in OABD with and without recurrent mood episodes over 5 years using neuropsychological tests.

Main Results:

• OABD consistently showed poorer cognitive functioning than healthy subjects, irrespective of mood state.
• Attention was significantly poorer only in depressed patients; memory performance worsened with current mood symptoms.
• No significant differences in cognitive functioning were found between OABD with or without recurrent mood episodes over 5 years.

Conclusions:

• Cognitive impairment in OABD appears stable and is not significantly affected by current mood state or episode recurrence.
• The findings do not support the hypothesis of a neuroprogressive course in bipolar disorder.
• Cognitive deficits in OABD are a persistent feature, independent of mood fluctuations or episode history.