Fibromyalgia in patients with rheumatoid arthritis. A 10-year follow-up study, results from the Oslo Rheumatoid Arthritis Register. 2019

Sella Aarrestad Provan, and Cathrine Austad, and Vera Halsaa, and Hilde Berner Hammer, and Tore Kristian Kvien, and Tillmann Uhlig
Department of Rheumatology, Diakonhjemmet Hospital, Oslo, Norway. sellaprovan@gmail.com.

OBJECTIVE To examine cross-sectional and longitudinal relationships between fibromyalgia (FM) and rheumatoid arthritis (RA) disease activity. METHODS 636 patients in the observational Oslo RA register (ORAR) were invited to a clinical examination in 1999. 28-tender and swollen joint counts (TJC, SJC) and 18-tender points were assessed, the RA disease activity score (DAS-28) calculated. Fibromyalgia (FM) was diagnosed according to 1990 (FM-1990) and modified 2011 (mFM-2011) ACR criteria. At the 10-year follow-up patients completed the RA Disease Activity Index (RADAI) and Routine Assessment of Patient Index Data 3 (RAPID-3). Baseline and 10-year RA disease activity were compared across presence/absence of FM. Linear regression models were constructed with 10-year RADAI and RAPID-3 as outcome. RESULTS 502 patients participated at baseline data-collection and 10-year data was available in 236. At baseline, mean (SD) age was 59.5 (12.5) years and 87% were female. 9% and 30% had FM-1990 and mFM-2011 respectively. RA-FM patients were predominantly female with higher SJC, TJC, and DAS-28 at baseline. Baseline RA-FM predicted higher levels of RADAI and RAPID-3 at the 10-year follow-up. CONCLUSIONS RA-FM was associated with significantly higher levels of cross-sectional and longitudinal RA disease activity. FM should be considered in patients with RA not reaching remission.

UI MeSH Term Description Entries
D008297 Male Males
D008875 Middle Aged An adult aged 45 - 64 years. Middle Age
D009664 Norway A country located in northern Europe, bordering the North Sea and the Atlantic Ocean, west of Sweden. The capital is Oslo. Kingdom of Norway
D012042 Registries The systems and processes involved in the establishment, support, management, and operation of registers, e.g., disease registers. Parish Registers,Population Register,Parish Register,Population Registers,Register, Parish,Register, Population,Registers, Parish,Registers, Population,Registry
D003430 Cross-Sectional Studies Studies in which the presence or absence of disease or other health-related variables are determined in each member of the study population or in a representative sample at one particular time. This contrasts with LONGITUDINAL STUDIES which are followed over a period of time. Disease Frequency Surveys,Prevalence Studies,Analysis, Cross-Sectional,Cross Sectional Analysis,Cross-Sectional Survey,Surveys, Disease Frequency,Analyses, Cross Sectional,Analyses, Cross-Sectional,Analysis, Cross Sectional,Cross Sectional Analyses,Cross Sectional Studies,Cross Sectional Survey,Cross-Sectional Analyses,Cross-Sectional Analysis,Cross-Sectional Study,Cross-Sectional Surveys,Disease Frequency Survey,Prevalence Study,Studies, Cross-Sectional,Studies, Prevalence,Study, Cross-Sectional,Study, Prevalence,Survey, Cross-Sectional,Survey, Disease Frequency,Surveys, Cross-Sectional
D005260 Female Females
D005356 Fibromyalgia A common nonarticular rheumatic syndrome characterized by myalgia and multiple points of focal muscle tenderness to palpation (trigger points). Muscle pain is typically aggravated by inactivity or exposure to cold. This condition is often associated with general symptoms, such as sleep disturbances, fatigue, stiffness, HEADACHES, and occasionally DEPRESSION. There is significant overlap between fibromyalgia and the chronic fatigue syndrome (FATIGUE SYNDROME, CHRONIC). Fibromyalgia may arise as a primary or secondary disease process. It is most frequent in females aged 20 to 50 years. (From Adams et al., Principles of Neurology, 6th ed, p1494-95) Diffuse Myofascial Pain Syndrome,Fibrositis,Rheumatism, Muscular,Fibromyalgia, Primary,Fibromyalgia, Secondary,Fibromyalgia-Fibromyositis Syndrome,Fibromyositis-Fibromyalgia Syndrome,Myofascial Pain Syndrome, Diffuse,Fibromyalgia Fibromyositis Syndrome,Fibromyalgia-Fibromyositis Syndromes,Fibromyalgias,Fibromyalgias, Primary,Fibromyalgias, Secondary,Fibromyositis Fibromyalgia Syndrome,Fibromyositis-Fibromyalgia Syndromes,Fibrositides,Muscular Rheumatism,Primary Fibromyalgia,Primary Fibromyalgias,Secondary Fibromyalgia,Secondary Fibromyalgias,Syndrome, Fibromyalgia-Fibromyositis,Syndrome, Fibromyositis-Fibromyalgia,Syndromes, Fibromyalgia-Fibromyositis,Syndromes, Fibromyositis-Fibromyalgia
D005500 Follow-Up Studies Studies in which individuals or populations are followed to assess the outcome of exposures, procedures, or effects of a characteristic, e.g., occurrence of disease. Followup Studies,Follow Up Studies,Follow-Up Study,Followup Study,Studies, Follow-Up,Studies, Followup,Study, Follow-Up,Study, Followup
D006801 Humans Members of the species Homo sapiens. Homo sapiens,Man (Taxonomy),Human,Man, Modern,Modern Man
D001172 Arthritis, Rheumatoid A chronic systemic disease, primarily of the joints, marked by inflammatory changes in the synovial membranes and articular structures, widespread fibrinoid degeneration of the collagen fibers in mesenchymal tissues, and by atrophy and rarefaction of bony structures. Etiology is unknown, but autoimmune mechanisms have been implicated. Rheumatoid Arthritis

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