Verbal learning impairment in euthymic bipolar disorder: BDI v BDII

被引:18
作者
Bourne, Corin [1 ,2 ]
Bilderbeck, Amy [1 ]
Drennan, Rebecca [1 ]
Atkinson, Lauren [1 ]
Price, Jonathan [1 ]
Geddes, John R. [1 ]
Goodwin, Guy M. [1 ]
机构
[1] Univ Oxford, Dept Psychiat, Oxford OX3 7JX, England
[2] Newman Univ, Dept Psychol Counselling & Psychotherapy, Birmingham, W Midlands, England
基金
美国国家卫生研究院;
关键词
Bipolar disorder subtypes; Cognitive impairment; Verbal learning and memory; COGNITIVE IMPAIRMENT; II DISORDER; OXIDATIVE STRESS; METAANALYSIS; IMPULSIVITY; NEUROPROGRESSION; NEUROPSYCHOLOGY; ASSOCIATION; DEPRESSION; ILLNESS;
D O I
10.1016/j.jad.2015.04.021
中图分类号
R74 [神经病学与精神病学];
学科分类号
摘要
Objectives: Cognitive impairment is known to occur in bipolar disorder (BD), even in euthymic patients, with largest effect sizes often seen in Verbal Learning and Memory Tasks (VLT). However, comparisons between BD Type-I and Type-II have produced inconsistent results partly due to low sample sizes. Methods: This study compared the performance of 183 BDI with 96 BDII out-patients on an adapted version of the Rey Verbal Learning Task. Gender, age, years of education, mood scores and age at onset were all used as covariates. Current medication and a variety of illness variables were also investigated for potential effects on VLT performance. Results: BDI patients were significantly impaired relative to BDII patients on all five VLT outcome measures after controlling for the other variables [Effect Sizes .13-.17]. The impairments seem to be unrelated to drug treatment and largely unrelated to illness variables, although age of onset affected performance on three outcome measures and number of episodes of mood elevation affected performance on one. Limitations: This study used historical healthy controls. Analysis of potential drug effects was limited by insufficient participants not being drug free. Cross-sectional nature of the study limited the analysis of the potential effect of illness variables. Conclusions: This study replicates earlier findings of increased verbal learning impairment in BDI patients relative to BDII in a substantially larger sample. Such performance cannot be wholly explained by medication effects or illness variables. Thus, the cognitive impairment is likely to reflect a phenotypic difference between bipolar sub-types. (C) 2015 The Authors. Published by Elsevier B.V.
引用
收藏
页码:95 / 100
页数:6
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