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OMERACT-based fibromyalgia symptom subgroups: an exploratory cluster analysis.

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    This study identified four distinct patient subgroups in fibromyalgia, categorized by symptom severity and specific mood profiles. These findings support personalized treatment approaches for fibromyalgia patients.

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    Area of Science:

    • Rheumatology
    • Clinical Psychology
    • Data Science

    Background:

    • Fibromyalgia (FM) is a complex condition characterized by widespread pain and other symptoms.
    • Identifying patient subsets with similar symptom profiles is crucial for understanding disease heterogeneity.
    • The Outcome Measures in Rheumatology (OMERACT) core symptom domains provide a framework for comprehensive symptom assessment.

    Purpose of the Study:

    • To identify distinct patient subgroups within fibromyalgia based on core symptom domains.
    • To utilize hierarchical agglomerative clustering for subgroup identification.
    • To validate the identified subgroups in an independent patient cohort.

    Main Methods:

    • A cohort of 581 female fibromyalgia patients completed validated questionnaires assessing pain, mood, sleep, fatigue, and quality of life.
    • Hierarchical agglomerative clustering was employed to group patients based on symptom profiles.
    • The clustering analysis was replicated in an external sample of 478 female fibromyalgia patients for validation.

    Main Results:

    • A four-cluster solution effectively categorized patients, with distinct severity levels across all symptoms.
    • Clusters 2 and 3 represented moderate symptom levels, differing primarily in anxiety and depression profiles.
    • Validation in an external sample confirmed the cluster solution, with minor variations in sleep disturbance patterns.

    Conclusions:

    • Clustering based on OMERACT core symptom domains revealed distinct fibromyalgia patient subgroups.
    • The identified subgroups, while requiring longitudinal confirmation, offer a basis for individualized clinical evaluation and intervention strategies.
    • This approach aids in understanding fibromyalgia heterogeneity and tailoring patient care.