Abstract
Purpose
To explore the brain microstructural and functional changes in patients with postherpetic neuralgia (PHN).
Materials and methods
12 PHN patients and 12 healthy volunteers were enrolled. Diffusion tensor imaging (DTI) and resting-state functional MRI (rfMRI) sequences were scanned by a 3T MR scanner. Fractional anisotropy (FA) and mean diffusivity (MD) t-maps were obtained following DTI data processing. The amplitude of low-frequency fluctuation (ALFF) and fractional ALFF (fALFF) were obtained following rfMRI data processing. A two sample t-test was performed to compare the FA, MD, ALFF and fALFF differences between the PHN patients and healthy controls.
Results
No significant differences were noted with regard to the parameters gender, age and education years between the two groups. FA, MD, ALFF and/or fALFF indicated significant alterations in specific pain or pain-related brain regions, such as brainstem, cerebellum, parietal lobe, precuneus, frontal lobe, temporal lobe, postcentral and precentral gyrus, corpus callosum, cingulate gyrus, putamen and insula.
Conclusion
Multi-local alterations of spontaneous brain activity could form a network related to chronic pain, sensory discrimination, emotion and cognition, suggesting complicated central mechanisms of PHN. The combined-action of brain microstructure and function may play a critical role in comprehension of neurological mechanisms of PHN-induced pain.
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Funding
This work was mainly supported by the National Natural Science Foundation of China (Grant numbers 81971573, 81671743, 81201079, 81471136, 81701098), Jiangsu Provincial Medical Youth Talent (Grant numbers QNRC2016709, QNRC2016740), Special Technical Project of Diagnosis and Treatment of Key Clinical Diseases of Suzhou (Grant number LCZX201801), and the "Six-one Project" for High-level Health Talents in Jiangsu Province (Grant number LGY2016035).
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Dai, H., Jiang, C., Wu, G. et al. A combined DTI and resting state functional MRI study in patients with postherpetic neuralgia. Jpn J Radiol 38, 440–450 (2020). https://doi.org/10.1007/s11604-020-00926-4
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DOI: https://doi.org/10.1007/s11604-020-00926-4