Diminished White Matter Integrity in Patients with Systemic Lupus Erythematosus

Tobias Schmidt-Wilcke, Patricia Cagnoli, Page Wang, Thomas Schultz, Anne Lotz, William J. Mccune und Pia C. Sundgren
In: NeuroImage: Clinical (2014)
 

Abstract

Purpose:Systemic lupus erythematosus (SLE) is an autoimmune connective tissue disease that can affect the central nervous system. Neuropsychiatric symptoms are found in 25–70% of patients. Using diffusion tensor imaging (DTI) various studies have reported changes in white matter integrity in SLE patients with neuropsychiatric symptoms (NPSLE patients). The purpose of this study was to investigate, if regional changes in white matter integrity can also be detected in SLE patients without neuropsychiatric symptoms (non-NPSLE patients). Methods:Applying DTI and tract based spatial statistics (TBSS) we investigated 19 NPSLE patients, 19 non-NPSLE and 18 healthy controls. Groups were matched for age and sex. Image pre-processing was performed using FSL, following the TBSS pipeline (eddy current correction, estimation of fractional anisotropy (FA), normalization, skeletonization of the group mean FA image). A general linear model with threshold-free cluster enhancement was used to assess significant differences between the three groups. Results: Statistical analyses revealed several regions of decreased prefrontal white matter integrity (decreased FA) in both groups of SLE patients. The changes found in the non-NPSLE patients (as compared to healthy controls) overlapped with those in the NPSLE patients, but were not as pronounced. Conclusions: Our data suggest that changes in regional white matter integrity, in terms of a decrease in FA, are present not only in NPSLE patients, but also in non-NPSLE patients, though to a lesser degree. We also demonstrate that the way statistical maps are corrected for multiple comparisons has a profound influence on whether alterations in white matter integrity in non-NPSLE patients are deemed significant.

Bilder

Bibtex

@ARTICLE{SchmidtWilcke:NIC2014,
    author = {Schmidt-Wilcke, Tobias and Cagnoli, Patricia and Wang, Page and Schultz, Thomas and Lotz, Anne and
              Mccune, William J. and Sundgren, Pia C.},
     title = {Diminished White Matter Integrity in Patients with Systemic Lupus Erythematosus},
   journal = {NeuroImage: Clinical},
      year = {2014},
  abstract = {Purpose:Systemic lupus erythematosus (SLE) is an autoimmune connective tissue disease that can
              affect the central nervous system. Neuropsychiatric symptoms are found in 25–70% of patients.
              Using diffusion tensor imaging (DTI) various studies have reported changes in white matter integrity
              in SLE patients with neuropsychiatric symptoms (NPSLE patients). The purpose of this study was to
              investigate, if regional changes in white matter integrity can also be detected in SLE patients
              without neuropsychiatric symptoms (non-NPSLE patients).
              Methods:Applying DTI and tract based spatial statistics (TBSS) we investigated 19 NPSLE patients, 19
              non-NPSLE and 18 healthy controls. Groups were matched for age and sex. Image pre-processing was
              performed using FSL, following the TBSS pipeline (eddy current correction, estimation of fractional
              anisotropy (FA), normalization, skeletonization of the group mean FA image). A general linear model
              with threshold-free cluster enhancement was used to assess significant differences between the
              three groups.
              Results: Statistical analyses revealed several regions of decreased prefrontal white matter
              integrity (decreased FA) in both groups of SLE patients. The changes found in the non-NPSLE patients
              (as compared to healthy controls) overlapped with those in the NPSLE patients, but were not as
              pronounced.
              Conclusions: Our data suggest that changes in regional white matter integrity, in terms of a
              decrease in FA, are present not only in NPSLE patients, but also in non-NPSLE patients, though to a
              lesser degree. We also demonstrate that the way statistical maps are corrected for multiple
              comparisons has a profound influence on whether alterations in white matter integrity in non-NPSLE
              patients are deemed significant.},
       url = {http://www.sciencedirect.com/science/article/pii/S2213158214000916},
       doi = {10.1016/j.nicl.2014.07.001}
}