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dc.contributor.authorTu, Cheng-Haoen_US
dc.contributor.authorNiddam, David M.en_US
dc.contributor.authorChao, Hsiang-Taien_US
dc.contributor.authorChen, Li-Fenen_US
dc.contributor.authorChen, Yong-Shengen_US
dc.contributor.authorWu, Yu-Teen_US
dc.contributor.authorYeh, Tzu-Chenen_US
dc.contributor.authorLirng, Jiing-Fengen_US
dc.contributor.authorHsieh, Jen-Chuenen_US
dc.description.abstractPrimary dysmenorrhea (PDM) is the most prevalent gynecological disorder for women in the reproductive age. PDM patients suffer from lower abdominal pain that starts with the onset of the menstrual flow. Prolonged nociceptive input to the central nervous system can induce functional and structural alterations throughout the nervous system. In PDM, a chronic viscero-nociceptive drive of cyclic nature, indications of central sensitization and altered brain metabolism suggest a substantial central reorganization. Previously, we hypothesized that disinhibition of orbitofrontal networks could be responsible for increased pain and negative affect in PDM. Here, we further tested this hypothesis. We used an optimized voxel-based morphometry (VBM) approach to compare total and regional gray matter (GM) increases and decreases in 32 PDM patients with 32 healthy age and menstrual cycle matched (peri-ovulatory phase) controls. Abnormal decreases were found in regions involved in pain transmission, higher level sensory processing, and affect regulation while increases were found in regions involved in pain modulation and in regulation of endocrine function. Moreover. GM changes in regions involved in top-down pain modulation and in generation of negative affect were related to the severity of the experienced PDM pain. Our results demonstrate that abnormal GM volume changes are present in PDM patients even in the absence of pain. These changes may underpin a combination of impaired pain inhibition, increased pain facilitation and increased affect. Our findings highlight that longer lasting central changes may occur not only in sustained chronic pain conditions but also in cyclic occurring pain conditions. (C) 2010 International Association for the Study of Pain. Published by Elsevier B.V. All rights reserved.en_US
dc.subjectPrimary dysmenorrheaen_US
dc.subjectVoxel-based morphometryen_US
dc.subjectMagnetic resonance imagingen_US
dc.subjectBrain structural changesen_US
dc.subjectPelvic painen_US
dc.titleBrain morphological changes associated with cyclic menstrual painen_US
dc.contributor.departmentDepartment of Computer Scienceen_US
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