Vachon-Presseau Etienne, Tétreault Pascal, Petre Bogdan, Huang Lejian, Berger Sara E, Torbey Souraya, Baria Alexis T, Mansour Ali R, Hashmi Javeria A, Griffith James W, Comasco Erika, Schnitzer Thomas J, Baliki Marwan N, Apkarian A Vania
1 Department of Physiology, Feinberg School of Medicine, Northwestern University 303 E. Chicago Ave., Chicago, IL 60611, USA.
2 Department of Psychiatry and Neurobehavioral Sciences, University of Virginia , 2955 Ivy Rd, Suite 210, Charlottesville, VA 22903, USA.
Brain. 2016 Jul;139(Pt 7):1958-70. doi: 10.1093/brain/aww100. Epub 2016 May 5.
SEE TRACEY DOI101093/BRAIN/AWW147 FOR A SCIENTIFIC COMMENTARY ON THIS ARTICLE: Mechanisms of chronic pain remain poorly understood. We tracked brain properties in subacute back pain patients longitudinally for 3 years as they either recovered from or transitioned to chronic pain. Whole-brain comparisons indicated corticolimbic, but not pain-related circuitry, white matter connections predisposed patients to chronic pain. Intra-corticolimbic white matter connectivity analysis identified three segregated communities: dorsal medial prefrontal cortex-amygdala-accumbens, ventral medial prefrontal cortex-amygdala, and orbitofrontal cortex-amygdala-hippocampus. Higher incidence of white matter and functional connections within the dorsal medial prefrontal cortex-amygdala-accumbens circuit, as well as smaller amygdala volume, represented independent risk factors, together accounting for 60% of the variance for pain persistence. Opioid gene polymorphisms and negative mood contributed indirectly through corticolimbic anatomical factors, to risk for chronic pain. Our results imply that persistence of chronic pain is predetermined by corticolimbic neuroanatomical factors.
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