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Neurocognitive subtypes in patients with bipolar disorder and their unaffected siblings

  • M. Russo (a1) (a2), T. E. Van Rheenen (a3) (a4) (a5), M. Shanahan (a1), K. Mahon (a1), M. M. Perez-Rodriguez (a1), A. Cuesta-Diaz (a1), E. Larsen (a1), A. K. Malhotra (a6) and K. E Burdick (a1) (a7) (a8) (a9)...
Abstract
Background

Our previous work revealed substantial heterogeneity in the cognitive profile of bipolar disorder (BD) due to the presence of three underlying cognitive subgroups characterized as: globally impaired, selectively impaired, or cognitively intact. In an effort to determine whether these subgroups are differentially related to genetic risk for the illness, we investigated whether cognitive deficits were more pronounced in unaffected siblings (UAS) of BD probands within identified clusters.

Methods

Cluster analysis was used to identify cognitive clusters in BD (N = 60). UAS (N = 49) were classified into groups according to their proband sibling's cluster assignment; comparisons were made across all clusters and healthy controls (HCs; N = 71).

Results

Three cognitive clusters in BD emerged: a globally impaired (36.7%), a selectively impaired (30%), and a cognitively intact cluster (33.3%). UAS showed a qualitatively similar pattern to their BD siblings; UAS of the globally impaired BD cluster showed verbal memory and general cognitive impairments relative to HCs. In contrast, UAS of the other two clusters did not differ from HCs.

Conclusions

This study corroborates findings from prior work regarding the presence of cognitive heterogeneity in BD. UAS of subjects in the globally impaired BD cluster presented with a qualitatively similar cognitive profile to their siblings and performed worse than all other BD clusters and UAS groups. This suggests that inherited risk factors may be contributing to cognitive deficits more notably in one subgroup of patients with BD, pointing toward differential causes of cognitive deficits in discrete subgroups of patients with the disorder.

Copyright
Corresponding author
*Address for correspondence: K. E. Burdick, Ph.D., Icahn School of Medicine at Mount Sinai, 1 Gustave L Levy Place, Box 1230, New York, NY 10029, USA. (Email: katherine.burdick@mssm.edu; kburdick1@bwh.harvard.edu)
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Psychological Medicine
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