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Profiles in fibromyalgia: algometry, auditory evoked potentials and clinical characterization of different subtypes

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Abstract

The heterogeneity found in fibromyalgia (FM) patients has led to the investigation of disease subgroups, mainly based on clinical features. The aim of this study was to test the hypothesis that clinical FM subgroups are associated with different underlying pathophysiological mechanisms. Sixty-three FM patients were classified in type I or type II, according to the Fibromyalgia Impact Questionnaire (FIQ), and in mild/moderate versus severe FM, according to the severity of three cardinal symptoms considered in the American College of Rheumatology (ACR) 2010 criteria (unrefreshed sleep, cognitive problems and fatigue). To validate the subgroups obtained by these two classifications, we calculated the area under the receiver operating characteristic curves for various clinical variables and for two potential biomarkers of FM: Response to experimental pressure pain (algometry) and the amplitude/intensity slopes of the auditory evoked potentials (AEPs) obtained to stimuli of increasing intensity. The variables that best discriminated type I versus type II were those related to depression, while the indices of clinical or experimental pain (threshold or tolerance) did not significantly differ between them. The variables that best discriminated the mild/moderate versus severe subgroups were those related to the algometry. The AEPs did not allow discrimination among the generated subsets. The FIQ-based classification allows the identification of subgroups that differ in psychological distress, while the index based on the ACR 2010 criteria seems to be useful to characterize the severity of FM mainly based on hyperalgesia. The incorporation of potential biomarkers to generate or validate classification criteria is crucial to advance in the knowledge of FM and in the understanding of pathophysiological pathways.

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Notes

  1. The 1990 ACR criteria of having more than 11 tender points have received several objections: the minimum number of tender points is arbitrary and should be interpreted as a distress indicator more than a classification criteria [45, 46]. By this reason, we decided to retain all the patients for the statistical analyses.

  2. One patient with missing data was not included in the cluster analysis of the ACR criteria.

  3. Note that the FIQ item Depression showed the highest AUC, but this index is not independent of the classification criterion.

  4. Note that the Pittsburgh Sleep Quality Index (PSQI) also reaches the significance level, but this index is not independent of the classification criterion.

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Acknowledgments

This work was supported by Spanish Ministry of Science and Innovation (ref PSI2009-14555).

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The authors have declared no conflicts of interest.

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Correspondence to María T. Carrillo-de-la-Peña.

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Triñanes, Y., González-Villar, A., Gómez-Perretta, C. et al. Profiles in fibromyalgia: algometry, auditory evoked potentials and clinical characterization of different subtypes. Rheumatol Int 34, 1571–1580 (2014). https://doi.org/10.1007/s00296-014-3007-1

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