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      Axial spondyloarthritis 10 years on: still looking for the lost tribe

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          Abstract

          Despite the publication of various recommendations, quality standards and referral strategies to promote early diagnosis in axial SpA (axSpA) over the last decade, there remains a significant delay to diagnosis, leading to a lost tribe of undiagnosed, untreated patients with persistent back pain and axSpA symptoms. This review discusses the various factors contributing to diagnostic delay in axSpA, while providing recommendations to improve the diagnostic pathway, for example use of the online Spondyloarthritis Diagnosis Evaluation (SPADE) tool ( http://www.spadetool.co.uk/). Significant shortcomings exist at both the primary and secondary care level, with healthcare professionals often lacking knowledge and awareness of axSpA. Myths regarding the classical signs and symptoms still prevail, including the perception of axSpA as a male disease, only occurring in individuals who are HLA-B27 positive with raised inflammatory markers. Individuals within this lost tribe of undiagnosed patients are likely lacking adequate treatment and are thereby at risk of worse clinical outcomes. It is therefore vital that public health initiatives are implemented to improve education of healthcare professional and to ensure early specialist referral, to ultimately improve the lives of patients with axSpA.

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          Most cited references141

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          The development of Assessment of SpondyloArthritis international Society classification criteria for axial spondyloarthritis (part II): validation and final selection.

          To validate and refine two sets of candidate criteria for the classification/diagnosis of axial spondyloarthritis (SpA). All Assessment of SpondyloArthritis international Society (ASAS) members were invited to include consecutively new patients with chronic (> or =3 months) back pain of unknown origin that began before 45 years of age. The candidate criteria were first tested in the entire cohort of 649 patients from 25 centres, and then refined in a random selection of 40% of cases and thereafter validated in the remaining 60%. Upon diagnostic work-up, axial SpA was diagnosed in 60.2% of the cohort. Of these, 70% did not fulfil modified New York criteria and, therefore, were classified as having "non-radiographic" axial SpA. Refinement of the candidate criteria resulted in new ASAS classification criteria that are defined as: the presence of sacroiliitis by radiography or by magnetic resonance imaging (MRI) plus at least one SpA feature ("imaging arm") or the presence of HLA-B27 plus at least two SpA features ("clinical arm"). The sensitivity and specificity of the entire set of the new criteria were 82.9% and 84.4%, and for the imaging arm alone 66.2% and 97.3%, respectively. The specificity of the new criteria was much better than that of the European Spondylarthropathy Study Group criteria modified for MRI (sensitivity 85.1%, specificity 65.1%) and slightly better than that of the modified Amor criteria (sensitivity 82.9, specificity 77.5%). The new ASAS classification criteria for axial SpA can reliably classify patients for clinical studies and may help rheumatologists in clinical practice in diagnosing axial SpA in those with chronic back pain. NCT00328068.
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            A systematic review of the global prevalence of low back pain.

            To perform a systematic review of the global prevalence of low back pain, and to examine the influence that case definition, prevalence period, and other variables have on prevalence. We conducted a new systematic review of the global prevalence of low back pain that included general population studies published between 1980 and 2009. A total of 165 studies from 54 countries were identified. Of these, 64% had been published since the last comparable review. Low back pain was shown to be a major problem throughout the world, with the highest prevalence among female individuals and those aged 40-80 years. After adjusting for methodologic variation, the mean ± SEM point prevalence was estimated to be 11.9 ± 2.0%, and the 1-month prevalence was estimated to be 23.2 ± 2.9%. As the population ages, the global number of individuals with low back pain is likely to increase substantially over the coming decades. Investigators are encouraged to adopt recent recommendations for a standard definition of low back pain and to consult a recently developed tool for assessing the risk of bias of prevalence studies. Copyright © 2012 by the American College of Rheumatology.
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              Axial spondyloarthritis.

              The term axial spondyloarthritis covers both patients with non-radiographic and radiographic axial spondyloarthritis, which is also termed ankylosing spondylitis. The disease usually starts in the third decade of life with a male to female ratio of two to one for radiographic axial spondyloarthritis and of one to one for non-radiographic axial spondyloarthritis. More than 90% heritabilty has been estimated, the highest genetic association being with HLA-B27. The pathogenic role of HLA-B27 is still not clear although various hypotheses are available. On the basis of evidence from trials the cytokines tumour necrosis factor (TNF)-α and interleukin-17 appear to have a relevant role in pathogenesis. The mechanisms of interaction between inflammation and new bone formation is still not completely understood but clarification will be important for the prevention of long-term structural damage of the bone. The development of new criteria for classification and for screening of patients with axial spondyloarthritis have been crucial for the early indentification and treatment of such patients, with MRI being the most important existing imaging method. Non-steroidal anti-inflammatory drugs and TNF blockers are effective therapies. Blockade of interleukin-17 is a new and relevant treatment option.
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                Author and article information

                Journal
                Rheumatology (Oxford)
                Rheumatology (Oxford)
                brheum
                Rheumatology (Oxford, England)
                Oxford University Press
                1462-0324
                1462-0332
                October 2020
                14 October 2020
                14 October 2020
                : 59
                : Suppl 4 , Axial spondyloarthritis: coming of age
                : iv25-iv37
                Affiliations
                [k1 ] Axial Spondyloarthritis Service, Royal National Hospital for Rheumatic Diseases, Royal United Hospitals NHS Foundation Trust
                [k2 ] Department of Computer Science, University of Bath
                [k3 ] Department for Health, University of Bath
                [k4 ] Department of Pharmacy & Pharmacology, University of Bath , Bath, UK
                Author notes
                Correspondence to: Rosemarie Barnett, Axial Spondyloarthritis Service, Royal National Hospital for Rheumatic Diseases, Royal United Hospitals NHS Foundation Trust, Bath BA1, UK. E-mail: rlb60@ 123456bath.ac.uk
                Author information
                http://orcid.org/0000-0002-2215-4970
                http://orcid.org/0000-0002-9720-0396
                Article
                keaa472
                10.1093/rheumatology/keaa472
                7566532
                33053196
                9b53717a-844d-4d7b-8091-a4d07adc27b1
                © The Author(s) 2020. Published by Oxford University Press on behalf of the British Society for Rheumatology.

                This is an Open Access article distributed under the terms of the Creative Commons Attribution Non-Commercial License ( http://creativecommons.org/licenses/by-nc/4.0/), which permits non-commercial re-use, [br]distribution, and reproduction in any medium, provided the original work is properly cited. For commercial re-use, please contact journals.permissions@oup.com

                History
                : 05 March 2020
                : 14 May 2020
                Page count
                Pages: 13
                Funding
                Funded by: Novartis, DOI 10.13039/100004336;
                Categories
                Supplement Papers
                AcademicSubjects/MED00360

                Rheumatology
                axial spondyloarthritis,diagnosis,healthcare professional awareness,early referral,extra-articular manifestations

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