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Published in: BMC Psychiatry 1/2013

Open Access 01-12-2013 | Research article

Neurocognitive profiles in treatment-resistant bipolar I and bipolar II disorder depression

Authors: Ute Kessler, Helle K Schoeyen, Ole A Andreassen, Geir E Eide, Åsa Hammar, Ulrik F Malt, Ketil J Oedegaard, Gunnar Morken, Kjetil Sundet, Arne E Vaaler

Published in: BMC Psychiatry | Issue 1/2013

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Abstract

Background

The literature on the neuropsychological profiles in Bipolar disorder (BD) depression is sparse. The aims of the study were to assess the neurocognitive profiles in treatment-resistant, acutely admitted BD depression inpatients, to compare the neurocognitive functioning in patients with BD I and II, and to identify the demographic and clinical illness characteristics associated with cognitive functioning.

Methods

Acutely admitted BD I (n = 19) and BD II (n = 32) inpatients who fulfilled the DSM-IV-TR criteria for a major depressive episode were tested with the MATRICS Consensus Cognitive Battery (MCCB), the Wechsler Abbreviated Scale of Intelligence, the National Adult Reading Test, and a battery of clinical measures.

Results

Neurocognitive impairments were evident in the BD I and BD II depression inpatients within all MCCB domains. The numerical scores on all MCCB-measures were lower in the BD I group than in the BD II group, with a significant difference on one of the measures, category fluency. 68.4% of the BD I patients had clinically significant impairment (>1.5 SD below normal mean) in two or more domains compared to 37.5% of the BD II patients (p = 0.045). A significant reduction in IQ from the premorbid to the current level was seen in BD I but not BD II patients. Higher age was associated with greater neurocognitive deficits compared to age-adjusted published norms.

Conclusions

A high proportion of patients with therapy-resistant BD I or II depression exhibited global neurocognitive impairments with clinically significant severity. The cognitive impairments were more common in BD I compared to BD II patients, particularly processing speed. These findings suggest that clinicians should be aware of the severe neurocognitive dysfunction in treatment-resistant bipolar depression, particularly in BD I.

Trial registration

Trial registration number: NCT00664976
Appendix
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Metadata
Title
Neurocognitive profiles in treatment-resistant bipolar I and bipolar II disorder depression
Authors
Ute Kessler
Helle K Schoeyen
Ole A Andreassen
Geir E Eide
Åsa Hammar
Ulrik F Malt
Ketil J Oedegaard
Gunnar Morken
Kjetil Sundet
Arne E Vaaler
Publication date
01-12-2013
Publisher
BioMed Central
Published in
BMC Psychiatry / Issue 1/2013
Electronic ISSN: 1471-244X
DOI
https://doi.org/10.1186/1471-244X-13-105

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