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Asymmetric alterations of white matter integrity in patients with insomnia disorder

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Abstract

Despite the adverse consequences of insomnia disorder for both individuals and society, the underlying neurobiological processes are poorly understood. The purpose was to further understand the alterations of white matter tracts in patients with insomnia and their association with sleep variables and also to determine if diffusion tensor imaging measures would be a useful disease marker. Twenty-six patients with insomnia and 26 age-matched healthy volunteers underwent diffusion tensor imaging. We employed an automated probabilistic tractography analysis approach using TRActs Constrained by UnderLying Anatomy (TRACULA) to quantify diffusion measures in major white matter tracts. We found significantly increased fractional anisotropy in the right cingulum-angular bundle and uncinate fasciculus in patients group compared to controls. Moreover, the mean diffusivity and radial diffusivity were reduced in the right cingulum-angular bundle in patients group in comparison with controls. We also found significantly increased fractional anisotropy along the bilateral cingulum-angular bundle and right uncinate fasciculus in patients. Also, mean and radial diffusivity were reduced along the right cingulum-angular bundle in patients group compared to controls. There is a significant positive correlation between fractional anisotropy and Epworth Sleepiness Scale scores. Moreover, there are negative correlations between mean, radial and axial diffusivity and total sleep time and sleep efficiency and also positive correlations between mean, radial and axial diffusivity and duration of disease and Pittsburgh Sleep Quality Index scores. This study showed the importance of examining whole-tract and waypoint white matter integrity in insomnia disorder. We found asymmetric widespread white matter integrity changes in patients with insomnia.

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Data availability

The datasets used and analysed during the current study are available from the corresponding author on reasonable request.

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Acknowledgements

The authors gratefully appreciate Kermanshah University of Medical Sciences and the volunteers for participating in this study.

Funding

This work was supported by the Kermanshah University of Medical Sciences [Grant Numbers 981014].

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MT, HK and MZ designed the study. NR and DK collected the data. MR and ZG processed the data and wrote the manuscript. KN and RF helped with statistical analysis and revised the manuscript. All authors reviewed the paper and approved the final version to be published.

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Correspondence to Habibolah Khazaie.

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The study was approved by Kermanshah University of Medical Science Ethics Committee.

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Rostampour, M., Gharaylou, Z., Rostampour, N. et al. Asymmetric alterations of white matter integrity in patients with insomnia disorder. Brain Imaging and Behavior 16, 389–396 (2022). https://doi.org/10.1007/s11682-021-00512-w

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