Tuberculosis Risk in Ankylosing Spondylitis, Other Spondyloarthritis, and Psoriatic Arthritis in Sweden: A Population-Based Cohort Study.

Objective: Rheumatoid arthritis is a risk factor for tuberculosis (TB), particularly following treatment with biologic agents. Since these therapies are increasingly used in ankylosing spondylitis (AS), other types of spondyloarthritis (SpA), and psoriatic arthritis (PsA), we investigated the corresponding TB risks in these patients.

Methods: We identified individuals with AS/SpA/PsA, and non-AS/SpA/PsA comparators by linking Swedish national patient, population, TB, and rheumatology registers, and followed them for TB occurrence.

C-reactive protein polymorphisms influence serum CRP-levels independent of disease activity in ankylosing spondylitis.

Objectives: C-reactive protein (CRP) levels are frequently used to determine disease activity in patients with ankylosing spondylitis (AS), but these levels may not reflect disease activity. We therefore investigated the influence of common single-nucleotide polymorphisms (SNPs) in the CRP gene on CRP levels in AS patients. Additionally, the relation between CRP levels and BASDAI (Bath Ankylosing Spondylitis Disease Activity Index) was examined.

Discovertebral (Andersson) lesions in severe ankylosing spondylitis: a study using MRI and conventional radiography.

The objective of this study is to investigate the prevalence of Andersson lesions (AL) in ankylosing spondylitis (AS) patients who will start anti-tumor necrosis factor (TNF) treatment. Radiographs and magnetic resonance imaging (MRI) of the spine were performed before therapy with anti-TNF. ALs were defined as discovertebral endplate destructions on MRI, associated with bone marrow edema and fat replacement or sclerosis, a decreased signal on T1, enhancement after contrast administration (gadolinium diethylenetriamine pentaacetic acid (Gd-DTPA)), and increased signal on T2 and short tau inversion recovery (STIR).

Erythrocyte sedimentation rate, C-reactive protein level, and serum amyloid a protein for patient selection and monitoring of anti-tumor necrosis factor treatment in ankylosing spondylitis.

Objective: To study the usefulness of erythrocyte sedimentation rate (ESR), C-reactive protein (CRP), and serum amyloid A (SAA) for response prediction and monitoring of anti-tumor necrosis factor (anti-TNF) treatment in ankylosing spondylitis (AS) patients.

Methods: Patients were included consecutively before starting etanercept or infliximab treatment. ASsessment in Ankylosing Spondylitis (ASAS) response, defined as a 50% improvement or an absolute improvement of 2 points of the Bath Ankylosing Spondylitis Disease Activity Index (BASDAI; 0-10 scale), was assessed at 3 months.

Discovertebral (Andersson) lesions of the spine in ankylosing spondylitis revisited.

A well-known complication in patients with ankylosing spondylitis (AS) is the development of localised vertebral or discovertebral lesions of the spine, which was first described by Andersson in 1937. Since then, many different terms are used in literature to refer to these localised lesions of the spine, including the eponym 'Andersson lesion' (AL). The use of different terms reflects an ongoing debate on the exact aetiology of the AL.

Decreased clinical response to infliximab in ankylosing spondylitis is correlated with anti-infliximab formation.

Objectives: Correlation of serum trough infliximab levels and antibodies to infliximab (anti-infliximab) with clinical response in ankylosing spondylitis.

Methods: In accordance with the international ASsessment in Ankylosing Spondylitis (ASAS) consensus statement, patients were treated with infliximab (5 mg/kg) every 6 weeks after a starting regimen. Preinfusion sera were collected at baseline, 24 and 54 weeks.