Abstract
Background
Previous neuroimaging research has examined static local brain activity changes in patients with anti-N-methyl-d-aspartate receptor (anti-NMDAR) encephalitis. However, the dynamic properties of local brain activity in anti-NMDAR encephalitis remain unknown.
Methods
This study used a combination of the amplitude of low-frequency fluctuation (ALFF) method and a sliding-window dynamic analysis approach to examine the time-varying local brain activity changes in anti-NMDAR encephalitis.
Results
Results showed that patients with anti-NMDAR encephalitis exhibited increased dynamic ALFF (dALFF) variability in the left inferior occipital gyrus compared to healthy controls (HCs), while the patients exhibited decreased sALFF in widespread regions, including the left inferior frontal gyrus, left medial frontal gyrus, bilateral putamen, left medial superior frontal gyrus. dALFF had superior classification performance in distinguishing anti-NMDAR encephalitis patients from HCs over sALFF, but sALFF was correlated with multiple clinical and neuropsychological measures.
Conclusions
These findings may shed light on anti-NMDAR encephalitis brain dysfunction from the perspective of dynamic local brain activity. sALFF and dALFF analyses provide complementary information, emphasizing the potential usefulness of combining sALFF and dALFF in elucidating the neuropathological mechanisms of autoimmune encephalitis and may ultimately inform future disease diagnosis.
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Data availability
All data generated or used during the study are available from the corresponding author by request.
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This work was supported by funding from the National Natural Science Foundation of China (32071054).
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Dongpeng Wu, Yuanyuan Guo, Chenglong Li designed the study. Dongpeng Wu, Yuanyuan Guo, Xiaonan Pang, Si Xu, Juanjuan Zhang, Ling Wei, and Qianqian Li collected and analyzed the data. Dongpeng Wu and Yuanyuan Guo drafted the manuscript. Jing Du, Yanghua Tian, and Kai Wang revised the draft.
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Wu, D., Guo, Y., Li, C. et al. Dynamic and static changes of amplitude of low-frequency fluctuations in anti‑N‑methyl‑D‑aspartate receptor encephalitis. Brain Imaging and Behavior 17, 652–663 (2023). https://doi.org/10.1007/s11682-023-00790-6
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DOI: https://doi.org/10.1007/s11682-023-00790-6