Clinical characteristics and medical management of Iranian patients with ankylosing spondylitis.

OBJECTIVES Ankylosing spondylitis (AS) is a chronic inflammatory rheumatic disease with variable clinical expression. Ethnic, racial and geographical factors have been associated with disease occurrence and expression. We intended to describe the clinical characteristics and assess the disease severity and treatment status in Iranian AS patients. METHODS A total of 320 AS patients were assessed for demographic variables, clinical manifestations, human leukocyte antigen (HLA) status, disease severity, functional capacities, quality of life and treatment status. RESULTS A gender ratio of 3.8:1, an average age onset of 27 ± 7.3 and a mean diagnostic delay of 8 years were observed. Eleven percent had juvenile onset AS. Positive family history was higher than that observed in most other countries. Enthesitis was a very common finding involving more than two-thirds of our patients. Uveitis was the leading extra-articular manifestation. We found an HLA-B27 prevalence of 73% and four HLA-B27 subtypes. Disease activity was high and the functional status was poor as indicated by mean Bath AS Disease Activity, Functional and Metrology indices. Quality of life was considerably impaired in our patients. We found a low percentage of patients on biological medications and a relatively higher percentage on disease modifying anti-rheumatic drugs and corticosteroids. CONCLUSIONS Our results demonstrate a broad characterization of Iranian AS patients providing a better understanding of this disease. A national multicenter registry would enable larger- scale prospective studies to be carried out further evaluating the disease burden on patients and society.