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Delineating psychological and biomedical profiles in a heterogeneous fibromyalgia population using cluster analysis

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Abstract

The heterogeneity of patients meeting American College of Rheumatology (ACR) criteria for a diagnosis of fibromyalgia (FM) challenges our ability to understand the underlying pathogenesis and to optimize treatment of this enigmatic disorder. Our goal was to discern clinically relevant subgroups across multiple psychological and biomedical domains to better characterize the phenomenology of FM. Women meeting 1990 ACR criteria for FM (N = 107) underwent psychological (childhood trauma, mood, anxiety, and stress) and biomedical (neuroendocrine, immune, and metabolic) testing. Cluster analysis identified four distinct subgroups. Subgroups I, II, and III exhibited profiles that included high psychological distress. Subgroup I was further distinguished by a history of childhood maltreatment and hypocortisolism, and these women reported the most pain and disability. Subgroup II evinced more physiological dysregulation and also reported high levels of pain, fatigue, and disability. Subgroup III was characterized by normal biomarkers and reported intermediate pain severity with higher global functioning. Subgroup IV was distinguished by their psychological well-being, reporting less disability and pain. Our findings underscore the heterogeneity of both psychological and physiological features among FM patients presenting with nearly identical tender point counts. This subgroup categorization is compatible with hypothesized pathogenetic mechanisms of early trauma, stress system dysregulation, and pro-inflammatory bias, each prominent in some but not all FM patients. Appreciation of distinct FM subgroup features is invaluable for selecting the most appropriate treatment modalities.

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Acknowledgments

This study was supported by a grant from the National Institute of Mental Health (MH61083). Dr. Coe receives partial salary support from the NIA, NIAID, and NICHD (AG20166, AI067518, HD38386). During the conduct of the study, Dr. Loevinger was supported by a National Institute of Health training grant (T32AG00265). Support for Dr. Shirtcliff was provided by a Career Development Award, K01-MH077687. This project benefited from the support and staff of our General Clinical Research Center (currently a CTSA 1UL1RR025011). We thank Holly Schleicher, PhD, for her invaluable assistance in data acquisition. We also express our gratitude to Jeff Jefferson, M.D., and Molly Carnes, M.D., M.S., for their editorial comments on early versions of this paper.

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Correspondence to Barbara L. Loevinger.

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This study is from the University of Wisconsin Mind/Body Center, Departments of Psychology, Psychiatry, and Rheumatology.

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Loevinger, B.L., Shirtcliff, E.A., Muller, D. et al. Delineating psychological and biomedical profiles in a heterogeneous fibromyalgia population using cluster analysis. Clin Rheumatol 31, 677–685 (2012). https://doi.org/10.1007/s10067-011-1912-1

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