Neurocognitive impairment in bipolar disorder patients: functional implications

Authors

  • Aliza P Wingo,

    1. Department of Psychiatry and Behavioral Sciences, Emory University, Atlanta, GA
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  • Philip D Harvey,

    1. Department of Psychiatry and Behavioral Sciences, Emory University, Atlanta, GA
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  • Ross J Baldessarini

    1. Department of Psychiatry and Neuroscience Program, Harvard Medical School, Boston
    2. Psychopharmacology Program and International Consortium for Bipolar Disorder Research, McLean Division of Massachusetts General Hospital, Belmont, MA, USA
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  • PDH has served as a consultant to or has received research support from AstraZeneca, Bristol-Myers Squibb, Eli Lilly & Co., Johnson & Johnson, Memory, Novartis, Pfizer, Solvay, Wyeth, and Sanofi-aventis. RJB is a consultant to or research collaborator with AstraZeneca, Auritec, Biotrofix, Janssen, JDS, Eli Lilly, Luitpold, NeuroHealing, Novartis, Pfizer, and SK-BioPharmaceuticals Corporations, but is not a member of pharmaceutical speakers bureaus, nor does he or any family member hold equity positions in biomedical or pharmaceutical corporations. APW has no relevant potential conflicts of interest.

Aliza P. Wingo, M.D., Department of Psychiatry, Emory University, 101 Woodruff Circle, NE, Suite 4000, Atlanta, GA 30322, USA. Fax: 404-727-3233; e-mail: aliza.wingo@emory.edu

Abstract

Background:  Functional recovery among treated bipolar disorder (BPD) patients is far less likely than syndromal and even symptomatic recovery. We hypothesized that increasingly well-documented aspects of cognitive impairment may contribute to poor functional outcomes in BPD patients, and reviewed the available research on the topic.

Methods:  Computerized literature searching identified 12 studies with 13 comparisons that simultaneously evaluated cognitive and functional status in euthymic (n = 8) or non-euthymic (n = 5 comparisons) adult BPD patients versus otherwise similar healthy controls.

Results:  In 6/8 studies of euthymic BPD patients and 5/5 studies of non-euthymic BPD patients, neurocognitive impairment was significantly associated with impaired psychosocial functioning, even after adjusting for residual mood symptoms and relevant demographic and clinical variables. Cognitive status was consistently assessed with standardized, performance-based neuropsychological tests, but functional status usually was based on subjective self-appraisals. Approximately 55% of BPD patients were unemployed.

Conclusions:  Available studies are limited by subjective assessments of functional status rather than objective, performance-based measures. Nevertheless, they support the hypothesis that enduring aspects of cognitive impairment found even in euthymic BPD patients are associated with inferior functioning. These findings encourage further studies with better assessment methods and greater rehabilitative efforts in BPD patients.

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