Neuroimaging predictors of functional outcomes in schizophrenia at baseline and 6-month follow-up

SCHIZOPHRENIA RESEARCH

卷:169

Article

Behdinan, Tina^1,2  Foussias, George^2,3,4  Wheeler, Anne L.¹  Stefanik, Laura¹  Felsky, Daniel^1,2  Remington, Gary^2,3,4  Rajji, Tarek K.^2,3,4  Chakravarty, M. Mallar^5,6  Voineskos, Aristotle N.^1,2,3,4 

[1] Ctr Addict & Mental Hlth, Res Imaging Ctr, Kimel Family Translat Imaging Genet Res Lab, Toronto, ON M5T 1R8, Canada

[2] Univ Toronto, Inst Med Sci, Toronto, ON M5S, Canada

[3] Ctr Addict & Mental Hlth, Campbell Family Mental Hlth Inst, Toronto, ON M5T 1R8, Canada

[4] Univ Toronto, Dept Psychiat, Toronto, ON M5S, Canada

[5] Douglas Mental Hlth Univ Inst, Cerebral Imaging Ctr, Verdun, PQ, Canada

[6] McGill Univ, Dept Psychiat, Montreal, PQ, Canada

关键词: Diffusion tensor imaging;    Fractional anisotropy;    Arcuate fasciculus;    Inferior longitudinal fasciculus;    Cortical thickness;    Network analysis;   

DOI  :  10.1016/j.schres.2015.10.023

来源: Elsevier

【 摘 要 】

Purpose: Studies show that deficit syndrome schizophrenia patients, characterized by primary negative symptoms and poor functional outcome, have impairment in specific neural circuits. We assessed whether these same neural circuits are directly linked to functional outcomes across schizophrenia patients. Methods: T1- and diffusion-weighted MR images were obtained for schizophrenia (n=30) and matched healthy control participants (n=30). Negative symptoms and functional outcome were assessed at baseline and 6-month follow-up. Cortical thickness and tract-wise fractional anisotropy (FA) were compared between groups. To assess relationships of neuroimaging measures with functional outcome, principal component analysis (PCA) was performed on tract-wise FA values and components were entered into a multiple regression model for schizophrenia participants. Results: Consistent with the literature, schizophrenia participants showed frontotemporal reductions in cortical thickness and tract-wise FA compared to controls. The top two components from PCA explained 71% of the variance in tract-wise FA values. The second component (associated with inferior longitudinal and arcuate fasciculus FA) was significantly correlated with functional outcome (baseline: beta=0.54, p=0.03; follow-up: beta=0.74, p=0.047); further analysis revealed this effect was mediated by negative symptoms. Post-hoc network analysis revealed increased cortical coupling between right inferior frontal and supramarginal gyri (connected by the arcuate fasciculus) in schizophrenia participants with poorer functional outcome. Conclusions: Our findings indicate that impairment in the same neural circuitry susceptible in deficit syndrome schizophrenia predicts functional outcome in a continuous manner in schizophrenia participants. This relationship was mediated by negative symptom burden. Our findings provide novel evidence for brain-based biomarkers of longitudinal functional outcome in people with schizophrenia. (C) 2015 Elsevier B.V. All rights reserved.

【 授权许可】

Free