The burden of early axial spondyloarthritis

In this thesis we aimed to investigate the burden of axial spondyloarthritis (axSpA) in an early phase. We have emphasized three main themes: (1) the value of a positive family history of SpA; (2) the impact of axSpA on health outcomes in an early phase of axSpA; and (3) illness perceptions and coping strategies of patients with axSpA.We have shown that when broad HLA-B27 testing is not useful, the presence of a positive family history of axSpA or uveitis could be used to predict HLA-B27 positivity in patients suspected of axSpA. We have demonstrated that health-related quality of life work productivity, and daily activities are seriously impacted even in the earliest phase of the axSpA and remain substantial over time. We have further shown that illness perceptions are important in the relationship between back pain and health outcomes in patients with axSpA. Our results suggest that illness perceptions and coping strategies do not change spontaneously and are rather independent of a decrease in disease status in patients with early axSpA.The knowledge and insights of this thesis could help us in making a timely diagnosis, providing treatment sooner, and exploring additional treatment options, which in turn could hopefully reduce the burden of axSpA.