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    A meta-analytic study of experimental and chronic orofacial pain excluding headache disorders

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    Author
    Ayoub, L.J.
    Seminowicz, D.A.
    Moayedi, M.
    Date
    2018
    Journal
    NeuroImage: Clinical
    Publisher
    Elsevier Inc.
    Type
    Article
    
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    See at
    https://dx.doi.org/10.1016/j.nicl.2018.09.018
    Abstract
    Chronic orofacial pain (COFP) disorders are prevalent and debilitating pain conditions affecting the head, neck and face areas. Neuroimaging studies have reported functional and grey matter abnormalities, but not all the studies have reported consistent findings. Identifying convergent abnormalities across COFPs provides a basis for future hypothesis-driven research aimed at elucidating common CNS mechanisms. Here, we perform three coordinate-based meta-analyses according to PRISMA guidelines to elucidate the central mechanisms of orofacial pain disorders. Specifically, we investigated consistent patterns of: (1) brain function to experimental orofacial pain in healthy subjects, (2) structural and (3) functional brain abnormalities in COFP. We computed our coordinate-based meta-analyses using GingerALE. The experimental pain meta-analysis revealed increased brain activity in bilateral thalami, posterior mid-cingulate cortices, and secondary somatosensory cortices, the right posterior parietal cortex extending to the orofacial region of the right primary somatosensory cortex and the right insula, and decreased activity in the right somatomotor regions. The structural COFP meta-analysis identified consistent higher grey matter volume/concentration in the right ventral thalamus and posterior putamen of COFP patients compared to healthy controls. The functional COFP meta-analysis identified a consistent increase in brain activity in the left medial and posterior thalamus and lesser activity in the left posterior insula in COFP, compared to healthy controls. Overall, these findings provide evidence of brain abnormalities in pain-related regions, namely the thalamus and insula, across different COFP disorders. The convergence of thalamic abnormalities in both structure and function suggest a key role for this region in COFP pathophysiology. Copyright 2018 The Authors
    Sponsors
    DAS is supported by a grant from NIH/NIDCR under Grant 1R21DE023964 . MM is supported by an NSERC Discovery Grant. M Moayedi acknowledges support from the Bertha Rosenstadt Endowment. We would also like to thank Mr. Erick Patrician and Mr. Steven Lee for their help in reviewing coordinates for the meta-analysis.
    Keyword
    fMRI
    grey matter volume
    MRI
    orofacial pain
    plasticity
    sMRI
    trigeminal
    VBM
    Brain
    Facial Pain
    Pain
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    Identifier to cite or link to this item
    https://www.scopus.com/inward/record.uri?eid=2-s2.0-85054190765&doi=10.1016%2fj.nicl.2018.09.018&partnerID=40&md5=027c9856da38553a2747df91fefd841d; http://hdl.handle.net/10713/8909
    ae974a485f413a2113503eed53cd6c53
    10.1016/j.nicl.2018.09.018
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