• Anna Woodbury, Venkatagiri Krishnamurthy, Melat Gebre, Vitaly Napadow, Corinne Bicknese, Mofei Liu, Joshua Lukemire, Jerry Kalangara, Xiangqin Cui, Ying Guo, Roman Sniecinski, and Bruce Crosson.
• Emory University School of Medicine, Atlanta, Georgia, USA.
• Pain Med. 2021 Mar 18; 22 (3): 715726715-726.

ObjectiveTo evaluate the feasibility of recruitment, preliminary efficacy, and acceptability of auricular percutaneous electrical nerve field stimulation (PENFS) for the treatment of fibromyalgia in veterans, using neuroimaging as an outcome measure and a biomarker of treatment response.DesignRandomized, controlled, single-blind.SettingGovernment hospital.SubjectsTwenty-one veterans with fibromyalgia were randomized to standard therapy (ST) control or ST with auricular PENFS treatment.MethodsParticipants received weekly visits with a pain practitioner over 4 weeks. The PENFS group received reapplication of PENFS at each weekly visit. Resting-state functional connectivity magnetic resonance imaging (rs-fcMRI) data were collected within 2 weeks prior to initiating treatment and 2 weeks following the final treatment. Analysis of rs-fcMRI used a right posterior insula seed. Pain and function were assessed at baseline and at 2, 6, and 12 weeks post-treatment.ResultsAt 12 weeks post-treatment, there was a nonsignificant trend toward improved pain scores and significant improvements in pain interference with sleep among the PENFS treatment group as compared with the ST controls. Neuroimaging data displayed increased connectivity to areas of the cerebellum and executive control networks in the PENFS group as compared with the ST control group following treatment.ConclusionsThere was a trend toward improved pain and function among veterans with fibromyalgia in the ST + PENFS group as compared with the ST control group. Pain and functional outcomes correlated with altered rs-fcMRI network connectivity. Neuroimaging results differed between groups, suggesting an alternative underlying mechanism for PENFS analgesia.Published by Oxford University Press on behalf of the American Academy of Pain Medicine 2020.

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