Abstract
Background
Axial spondyloarthritis (axSpA) comprises patients with both radiographic and non-radiographic features. Previous studies have shown similar burden of disease between these two groups.
Aims
The Ankylosing Spondylitis Registry of Ireland (ASRI) was formed with the objective to measure the burden of axial spondyloarthritis in the population and identify early predictors of a poor outcome. For this analysis, the ASRI database was used to compare the characteristics and burden of disease in patients with radiographic versus non-radiographic axial spondyloarthritis.
Methods
Patients with radiographic axial spondyloarthritis (r-axSpA) were defined as those with X-ray evidence of sacroiliitis. Patients with non-radiographic axial spondyloarthritis (nr-axSpA) were defined as having MRI evidence of sacroiliitis but no X-ray evidence of sacroiliitis.
Results
In total, 764 patients were included. Analysis of radiographic status showed 88.1% (n = 673) of patients with r-axSpA and 11.9% (n = 91) with nr-axSpA (Table 1). Patients with nr-axSpA were younger (41.3 vs. 46.6 years, p < 0.01), had shorter disease duration (14.8 vs. 20.2 years, p < 0.01) and had lower proportion of males (66.6% vs. 78.4%, p = 0.02) with lower frequency of HLA-B27 positivity (73.6% vs. 90.5%, p < 0.01). The nr-axSpA group had lower BASDAI (3.37 vs. 4.05, p = 0.01), BASFI (2.46 vs. 3.88, p < 0.01), BASMI (2.33 vs. 4.34, p < 0.01), ASQoL (5.2 vs. 6.67, p = 0.02) and HAQ scores (0.38 vs. 0.57, p < 0.01). There were no significant differences in the prevalence of extra-musculoskeletal manifestations or use of medications.
Conclusions
This study provides evidence to suggest that the burden of disease is less in patients with non-radiographic axial spondyloarthritis than radiographic axial spondyloarthritis.
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Data availability
The data that support the findings of this study are available from the corresponding author, (SQ), upon reasonable request.
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Funding
The Ankylosing Spondylitis Registry of Ireland (ASRI) is supported by an unrestricted grant from Pfizer Pharmaceuticals and AbbVie Pharmaceuticals. The funders had no role in the design of the study, collection of the data, analysis and interpretation of the data, or any part of manuscript preparation.
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All authors whose names appear on the submission made substantial contributions to the conception or design of the work; or the acquisition, analysis or interpretation of data; or the creation of new software used in the work; drafted the work or revised it critically for important intellectual content; approved the version to be published and agree to be accountable for all aspects of the work in ensuring that questions related to the accuracy or integrity of any part of the work are appropriately investigated and resolved.
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The required ethical approval was gained from all participating hospital ethics boards and are in line with the 1964 Helsinki Declaration and its later amendments.
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Informed consent was obtained from all participants in the ASRI cohort for this study.
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Key messages:
• This study suggests the burden of disease is greater in patients with r-axSpA than nr-axSpA.
• Greater burden of disease in r-axSpA may provide extra impetus to institute early treatment.
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Quinn, S., Maguire, S., O’Shea, F. et al. Characteristics and burden of disease in patients with radiographic versus non-radiographic axial spondyloarthritis in the ASRI cohort. Ir J Med Sci 193, 443–448 (2024). https://doi.org/10.1007/s11845-023-03439-x
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DOI: https://doi.org/10.1007/s11845-023-03439-x