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The mechanistic link between human leukocyte antigen B27 (HLA-B27) and ankylosing spondylitis (AS) is one of the great enigmas in rheumatology. The introduction of biological therapies that target tumor necrosis factor (TNF) or the interleukin (IL) 23/IL-17A axis has had a major impact on the quality of life for many patients with AS, and one…
The Latest on Eosinophilic Granulomatosis with Polyangiitis
The past five years have been busier than usual for the Churg-Strauss syndrome. It was renamed eosinophilic granulomatosis with polyangiitis (EGPA).1 Longitudinal cohorts totaling 484 patients—approximately as many as all previous series combined—were described.2,3 A proposal was advanced to remove and rename a subset in which vasculitis may not be present.4 And shortly after the…
ACR Winter Rheumatology Symposium: Tips for ANCA Testing
How to select the correct testing method and interpret conflicting results from antineutrophil cytoplasmic antibody tests
Case Report: Hydralazine-Induced ANCA-Associated Vasculitis
Hydralazine has been in use as a treatment for hypertension, most notably in heart failure patients, since 1951.1 The drug is a known cause of autoimmune disease, most specifically hydralazine-induced lupus. Hydralazine-induced lupus occurs in 7–13% of those taking the medication.2-4 It often presents with constitutional symptoms, arthritis/arthralgias, cutaneous lesions, serositis, myalgias and/or hepatomegaly. Features…