Abstract
Amyotrophic lateral sclerosis-frontotemporal dementia (ALS-FTD) is rare but exhibits worse prognosis than either ALS or FTD alone. However, cognitive onset ALS-FTD (ALS-FTD-C) confers significantly better patient survival than does motor onset ALS-FTD (ALS-FTD-M), underscoring a meager understanding of pathological group differences. This study aimed to assess disparities in cortical atrophy and perfusion shown by patients with the above disease variants. A total of 38 participants (ALS-FTD-C, 8; ALS-FTD-M, 6; simultaneous-onset ALS-FTD [ALS-FTD-S], 4; healthy controls [HC], 20) qualified for the study and underwent magnetic resonance imaging scan. Three-dimensional T1-weighted structural brain imaging and 3D-pseudocontinuous arterial spin-labeled imaging were routinely collected. Gray matter volume (GMV) and cerebral blood flow (CBF) in ALS-FTD-C and ALS-FTD-M were compared through voxel-based analysis. Correlations between imaging parameters and clinical data were also assessed. Compared with HC, ALS-FTD had significant GMV reduction mainly in bilateral limbic system. GMV reduction in ALS-FTD-C was similar in pattern but less widespread, whereas ALS-FTD-M lacked any significant GMV reduction. In CBF analyses, ALS-FTD displayed hypoperfusion in bilateral motor cortex, frontotemporal lobe, and left basal ganglia. Hypoperfusion involved bilateral temporal lobe, prefrontal cortex, and putamen in ALS-FTD-C but was limited to left parahippocampal gyrus in ALS-FTD-M. Correlations between clinical data and GMV/CBF changes in specific regions were also identified in ALS-FTD. Group-specific patterns of cortical atrophy and perfusion were evident in ALS-FTD-C and ALS-FTD-M. ALS-FTD-C showed pronounced cortical atrophy and hypoperfusion, which were otherwise minimal in ALS-FTD-M. Above findings preliminarily revealed the pathological group differences that may help in classifying patients with ALS-FTD.
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The datasets used and analyzed during the current study are available from the corresponding author on reasonable request.
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References
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Acknowledgements
We thank the ALS-FTD patients and healthy controls for participating in this study.
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This study was supported by the National Natural Science Foundation of China (Grant number: 81801277) and the Strategic Priority Research Program of the Chinese Academy of Sciences (Grant number: XDB39000000).
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YW and DS: study concept and design, data acquisition, statistical analysis, data interpretation, drafting of the manuscript. BH: data acquisition, statistical analysis, critical revision of the manuscript. XS, XY, JG, and ML: data acquisition, study supervision, critical revision of the manuscript. FF: study concept and design, data interpretation, critical revision of the manuscript. LC: study concept and design, data acquisition, data interpretation, study supervision, critical revision of the manuscript.
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Wang, Y., Shen, D., Hou, B. et al. Brain structural and perfusion changes in amyotrophic lateral sclerosis-frontotemporal dementia patients with cognitive and motor onset: a preliminary study. Brain Imaging and Behavior 16, 2164–2174 (2022). https://doi.org/10.1007/s11682-022-00686-x
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DOI: https://doi.org/10.1007/s11682-022-00686-x